September Weather in Phra Nakhon, Thailand

Last updated: August 27, 2025

In September, Phra Nakhon, Thailand, experiences a warm climate characterized by a maximum temperature reaching 36°C (97°F) and an average temperature of 29°C (84°F). The evenings offer a pleasant respite, with lows around 24°C (76°F). Rainfall is a significant feature this month, with 245 mm (9.6 in) of precipitation spread over 24 days, creating a humid environment with levels reaching 87%. This combination of heat and moisture sets the stage for a vibrant, albeit rainy, atmosphere, making September a unique month in the region's weather calendar.

September Temperature in Phra Nakhon

In September, Phra Nakhon experiences a slight dip in temperatures, making it a more temperate transition from the sweltering summer months. With minimums around 24°C (76°F) and a comfortable average of 29°C (84°F), this month serves as a gentle reminder that the peak heat is waning. The maximum temperature reaches a still-warm 36°C (97°F), which is a tamer prospect compared to the scorching highs of earlier months. This period marks a notable trend where, despite retaining warmth, the humid intensity begins to ease, inviting both locals and visitors to enjoy outdoor activities without the oppressive heat that characterizes the peak summer. As the month rolls into October, temperatures will continue to hold steady, signaling the gradual transition into the more refreshing months ahead.

September Weather in Phra Nakhon: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Phra Nakhon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Phra Nakhon, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec808285868686858584838280
Data source: Temperature data for Phra Nakhon generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Phra Nakhon

In September, Phra Nakhon experiences a significant uptick in precipitation, with 245 mm (or 9.6 inches) of rainfall over 24 days. This surge marks the peak of the wet season, following a pattern established over the preceding months, where rainfall steadily increased from 29 mm in January to a noteworthy 163 mm in August. The gradual rise in both the amount of rain and the number of rainy days underscores the region's transition into a more humid and saturated environment as the monsoon reaches its apex. Contrast this with the drier months that follow; October's rainfall is only slightly higher at 250 mm, suggesting a gradual tapering of the monsoon effect as the year moves towards its drier months.

September Precipitation Trends in Phra Nakhon

The chart displays monthly precipitation patterns in Phra Nakhon, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Phra Nakhon, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec2914441071421121591632452506124
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Phra Nakhon

As September rolls into Phra Nakhon, Thailand, the humidity remains notably high at 87%, slightly lower than the peak months of July and August. This time of year typically witnesses a gradual shift from the intense heat and moisture of the summer, though the air remains thick and oppressive for many. Following a steady increase from January's 59%, humidity levels culminated in a summer peak, and now begin to subtly decline as the rainy season transitions into fall. The decrease in humidity is expected to continue into October, bringing some relief before the colder months set in. Overall, the September climate showcases the characteristic humid tropical weather that defines this vibrant region.

September Average Humidity in Phra Nakhon

This chart illustrates the average monthly humidity levels in Phra Nakhon, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Phra Nakhon is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec59%58%61%70%80%85%86%88%87%83%78%70%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Phra Nakhon

In September, the UV Index in Phra Nakhon, Thailand, remains notably high, sitting at 13, which is classified as extreme. This signals that sun exposure can lead to skin damage in just 10 minutes, highlighting the importance of protective measures during outdoor activities. As autumn approaches, the UV levels show a slight decline from the peak months of July and August, yet the risk remains significant. Over the past year, the region has consistently faced extreme UV Index values from February through September, underscoring the need for vigilance. To stay informed and safe, you can check the latest updates on the Phra Nakhon UV Index.

Maximum UV Index Levels in Phra Nakhon for September

The chart shows the monthly maximum UV Index (UVI) for Phra Nakhon in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Phra Nakhon typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1012141314131414131298
Data source: Phra Nakhon September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Phra Nakhon

As September unfolds in Phra Nakhon, Thailand, the sunshine bathes the city for 268 hours, marking a gentle decline from the summer's peak brightness. This month follows a steady drop in sunlight hours from the sun-drenched days of March, which boasts an impressive 336 hours, showcasing the region's vibrant warmth as the dry season approaches. While September brings slightly less sunshine, it still shines brighter than the months of July and August, which hover near the low point of 290 and 280 hours, respectively. The trend highlights a transition towards milder weather, making way for the invigorating breezes of October, which see a slight resurgence in sunshine with 287 hours. Embracing this ebb and flow, September serves as a beautiful bridge between the high-energy days of summer and the comforting warmth of the impending fall.

Monthly Sunshine Duration in Phra Nakhon: September Highlighted

The September sunshine duration represents the total number of hours Phra Nakhon experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec251h299h336h322h321h302h290h280h268h287h294h316h
Data source: Phra Nakhon September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Phra Nakhon During September

In Phra Nakhon, Thailand, September marks a notable dip in the chance of sunny weather, with only a 10% likelihood of sunshine. This trend of diminishing sunlight can be traced back through the months, as the rainy season takes hold following the relatively brighter days of January, February, and March, which enjoy sun chances of 58%, 76%, and 56% respectively. By April, the sunshine fades significantly, dropping to 18%, and continues on a downward trajectory through the summer months, hitting a low in August with just 9%. Thus, travelers seeking clear skies may want to reconsider their plans for September, when the sun is scarce and the chances of encountering rain are much higher.

Percentage of Sunny Days in September in Phra Nakhon

The chart illustrates the percentage of sunny days in Phra Nakhon throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Phra Nakhon experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec58%76%57%18%33%17%11%9%10%14%29%63%
Data source: Phra Nakhon September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Phra Nakhon in September

In Phra Nakhon, Thailand, September marks a consistent trend in daylight hours, maintaining 12 hours of sunlight, much like the preceding months of April through August. This steady duration reflects a tropical climate where sunshine is abundant throughout the year, accentuating the region's warm ambiance. As September approaches the end of the wet season, the daylight gradually begins to decline as the year transitions into October, which will soon see a reduction to 11 hours. This remarkable stability in daylight hours fosters a vibrant outdoor culture, allowing locals and visitors alike to enjoy the lush landscapes and lively street scenes well into the evening.

Average Daylight Hours in Phra Nakhon for September

The chart illustrates the variation in daylight duration in Phra Nakhon throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 24m11h 40m12h 2m12h 25m12h 45m12h 54m12h 49m12h 33m12h 11m11h 48m11h 28m11h 19m
Data source: Phra Nakhon daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Phra Nakhon

As September rolls into Phra Nakhon, Thailand, the gentle breeze whispers a comforting lull, with an average wind speed of 2.0 m/s (5 mph). This slight dip from the summer months reflects a transitional period in the region's climate. After experiencing stronger gusts in June and March, both peaking at 3.0 m/s (7 mph), the winds begin their soft descent, offering a more tranquil atmosphere as the rainy season approaches. For those reveling in the vibrant street life and rich culture of Phra Nakhon, this mild wind creates the perfect backdrop for leisurely explorations, balancing warmth and coolness in the air. As the month progresses, the consistent yet gentle winds continue, setting the stage for the emerging beauty of October.

Average September Wind Speed in Phra Nakhon

The chart displays monthly wind speed patterns in Phra Nakhon, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.32.43.01.92.43.02.72.62.0 m/s2.02.22.6
Data source: Phra Nakhon September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Phra Nakhon Compares to Other Months

Weather in Phra Nakhon varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Phra Nakhon, focusing on differences in temperature, rainfall, humidity, and UV levels.

September and January present stark contrasts in weather conditions. In September, temperatures range from a minimum of 24°C (76°F) to a sweltering maximum of 36°C (97°F), with an average temperature of 29°C (84°F). Moreover, this month is marked by high humidity levels at 87% and significant rainfall, totaling 245 mm (9.6 in) over 24 days. In contrast, January offers milder temperatures, with a minimum of 16°C (61°F), an average of 27°C (81°F), and a maximum of 35°C (94°F). Rainfall is minimal at just 29 mm (1.1 in) over 3 days, and humidity drops to a more comfortable 59%. To learn more about the weather specifics in January, you can visit Phra Nakhon weather in January.

September and February present markedly different weather patterns. In September, temperatures range from a minimum of 24°C (76°F) to a maximum of 36°C (97°F), with an average of 29°C (84°F). This month is characterized by high humidity at 87% and substantial rainfall of 245 mm (9.6 in) spread over 24 days. In contrast, February enjoys milder conditions with temperatures from a low of 19°C (66°F) to a high of 35°C (96°F), averaging 28°C (82°F). The month sees significantly less rain, only 14 mm (0.5 in), and features just 3 days of precipitation, resulting in a much lower humidity level of 58%. For more detailed weather specifics, you can check Phra Nakhon weather in February.

In September, the weather is characterized by warmer temperatures, ranging from a minimum of 24°C (76°F) to a maximum of 36°C (97°F), with an average of 29°C (84°F). This month also sees significant rainfall, with 245 mm (9.6 in) of precipitation over 24 days, contributing to a high humidity level of 87%. In contrast, March features slightly cooler conditions, with temperatures ranging from a minimum of 22°C (72°F) to a maximum of 37°C (99°F) and an average of 30°C (86°F). Notably, March experiences far less rainfall, accumulating just 44 mm (1.7 in) over only 5 days, resulting in a more comfortable humidity level of 61%. For more detailed insights on weather trends, please refer to Phra Nakhon weather in March.

September and April present contrasting weather conditions. In September, the temperature ranges from a minimum of 24°C (76°F) to a maximum of 36°C (97°F), with an average of 29°C (84°F) and a high level of humidity at 87%. The month experiences significant rainfall, with a total precipitation of 245 mm (9.6 in) over 24 days, making it one of the wetter periods. In contrast, April is generally warmer, featuring temperatures that range from a minimum of 21°C (70°F) to a scorching maximum of 38°C (100°F), averaging at 30°C (87°F). Additionally, precipitation is considerably lower at 107 mm (4.2 in) across just 12 days and the humidity is less intense at 70%. For more specific details on April weather patterns, visit Phra Nakhon weather in April.

When comparing the weather in September and May, we see distinct differences in temperature and precipitation. September experiences slightly higher humidity at 87%, with average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 36°C (97°F). This month also sees significant rainfall, with 245 mm (9.6 in) over 24 days. In contrast, May has a slightly lower humidity level of 80% but boasts higher maximum temperatures, reaching 40°C (103°F). The precipitation in May is less intense, totaling 142 mm (5.6 in) over 19 days. For more information on May weather specifically, you can check Phra Nakhon weather in May.

In comparing the weather of September and June, we observe notable similarities and differences. September experiences slightly lower temperatures, with a minimum of 24°C (76°F) and an average of 29°C (84°F), compared to June's 25°C (78°F) minimum and 30°C (86°F) average. Both months reach similar maximum temperatures, with June peaking at 37°C (99°F) and September at 36°C (97°F). However, September is significantly wetter, receiving 245 mm (9.6 in) of precipitation over 24 days, while June has only 112 mm (4.4 in) of rainfall over 22 days. Humidity levels are quite comparable, with September at 87% and June at 85%. For more specific weather details, you can refer to Phra Nakhon weather in June.

When comparing the weather in September and July, September tends to be slightly more humid, with an average humidity of 87% compared to July's 86%. The temperatures are quite similar, with September having a minimum of 24°C (76°F), an average of 29°C (84°F), and a maximum of 36°C (97°F), while July features a minimum of 25°C (78°F), an average of 29°C (85°F), and a maximum of 37°C (99°F). One striking difference is the precipitation: September experiences significantly more rain, with 245 mm (9.6 in) over 24 days, while July sees 159 mm (6.2 in) over 26 days. For more details about July weather specifically, you can check this link: Phra Nakhon weather in July.

In comparing the weather patterns of September and August, we observe some notable differences. September experiences slightly cooler nighttime temperatures, with a minimum of 24°C (76°F) compared to August's minimum of 25°C (77°F). Despite having similar average temperatures of around 29°C (84°F to 85°F), September's maximum temperature of 36°C (97°F) is slightly lower than August's peak of 37°C (99°F). However, September is marked by significantly higher precipitation levels, receiving 245 mm (9.6 in) over 24 days, while August recorded 163 mm (6.4 in) over 23 days. Additionally, humidity levels remain quite high in both months, with September at 87% and August at 88%. For a more detailed look at August weather, you can visit Phra Nakhon weather in August.

In September, the weather is characterized by slightly warmer temperatures, with minimums around 24°C (76°F) and maximums reaching 36°C (97°F). The month experiences significant rainfall, averaging 245 mm (9.6 in) over 24 days, coupled with high humidity levels at 87%. In contrast, October sees a slight decrease in maximum temperature to 35°C (96°F) and a minimal change in minimum temperature at 23°C (74°F). Rainfall increases slightly to 250 mm (9.9 in) but occurs over fewer days, 21 in total, with humidity levels easing to 83%. For more details on the October weather, you can visit Phra Nakhon weather in October.

September and November showcase notable differences in weather patterns. September experiences higher temperatures with a minimum of 24°C (76°F) and an average of 29°C (84°F), peaking at 36°C (97°F). It is also characterized by heavy rainfall, receiving 245 mm (9.6 in) over 24 days and high humidity levels at 87%. In contrast, November sees slightly cooler temperatures with a minimum of 21°C (70°F), an average of 28°C (83°F), and a maximum of 35°C (95°F). The month is much drier, with only 61 mm (2.4 in) of precipitation occurring over just 9 days, and humidity drops to 78%. For a detailed overview of November weather specifics, you can visit Phra Nakhon weather in November.

September and December present notable contrasts in weather. In September, temperatures range from a minimum of 24°C (76°F) to a scorching maximum of 36°C (97°F), with an average temperature of 29°C (84°F). This month is characterized by high humidity at 87% and frequent rainfall, with 245 mm (9.6 in) of precipitation over 24 days. In stark contrast, December sees a cooler climate, with temperatures ranging from a minimum of 15°C (59°F) to a maximum of 35°C (95°F) and an average of 27°C (80°F). Rainfall significantly decreases to just 24 mm (0.9 in) over 2 days and humidity drops to 70%. For more details on December weather, visit Phra Nakhon weather in December.

Compare Phra Nakhon's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Phra Nakhon

As September graces Phra Nakhon, the weather begins to transition into a more humid and wet phase compared to the preceding months. With an average temperature around 29°C (84°F), days can feel balmy, especially with an increased humidity level of 87%. The frequent rainfall—spanning about 24 days this month—brings vibrant greenery but can also lead to some indoor days. While the maximum temperature still peeks at around 36°C (97°F), the combination of warmth and moisture sets September apart from the drier months, making it a unique time to experience the local climate. For a deeper dive into the seasonal variations, check out Phra Nakhon Climate.