September Weather in Nong Khai, Thailand

Last updated: August 27, 2025

September in Nong Khai, Thailand, reveals a vibrant climate marked by warm temperatures and substantial rainfall. With a maximum temperature soaring to 36°C (98°F) and an average hovering around 28°C (83°F), the heat can be quite palpable, particularly in the midst of high humidity levels reaching 86%. The region experiences significant precipitation, accumulating 260 mm (10.2 in) over 24 days, which contributes to a lush, green landscape but may also lead to a sense of dampness throughout the month. Whether you're navigating through showers or enjoying the interludes of sunshine, September offers a uniquely tropical experience in this picturesque part of Thailand.

September Temperature in Nong Khai

In September, Nong Khai, Thailand, experiences a gentle transition as the monsoon season begins to wane. With minimum temperatures around 22°C (73°F) and averages settling at 28°C (83°F), the weather remains warm yet increasingly comfortable compared to the sweltering summer months. Maximum temperatures reach 36°C (98°F), mirroring the highs of August, but there's a noticeable dip in extremes as the month progresses. This slight decline hints at the approaching cooler season, allowing visitors to enjoy the lush greenery and vibrant landscapes without the overwhelming heat of the peak summer months. As the rains become less frequent, September proves to be a delightful time to explore the natural beauty and cultural richness of the region.

September Weather in Nong Khai: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Nong Khai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nong Khai, 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).
JanFebMarAprMayJunJulAugSepOctNovDec747682848584848383827973
Data source: Temperature data for Nong Khai generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Nong Khai

September marks a significant transition in Nong Khai, Thailand, where the monsoon season begins to wind down, yet still delivers a substantial precipitation total of 260 mm (10.2 in) over 24 days. This month sees a notable decrease from the peak rainfall of August's 410 mm, highlighting the typical trend of diminishing precipitation as the season progresses. Nevertheless, September remains no stranger to rain, with nearly a third of the month experiencing wet conditions, underlining the region's dynamic climate. As the lush landscapes begin to recover from the monsoon's intensity, September stands as a bridge between the heavy rains of summer and the drier months ahead.

September Precipitation Trends in Nong Khai

The chart displays monthly precipitation patterns in Nong Khai, 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 Nong Khai, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec512366819931035141026012486
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Nong Khai

In Nong Khai, Thailand, September marks a notable point in the annual humidity cycle, with levels averaging 86%, a slight decrease from the peak reached during the sweltering months of July and August, which see humidity levels soar to 90% and 92%, respectively. As the monsoon season transitions towards its end, humidity remains relatively high, providing a lingering tropical embrace before gradually tapering off in the coming months. This pattern reflects a clear trend of rising humidity from the cooler, drier months in January (59%) through April (40%) into the intense dampness of mid-year, showcasing how the climate in Nong Khai shifts dramatically from the dry season to the wet season, ultimately culminating in a warm and humid September.

September Average Humidity in Nong Khai

This chart illustrates the average monthly humidity levels in Nong Khai, 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 Nong Khai is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec59%54%45%40%65%82%90%92%86%80%72%67%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Nong Khai

In September, Nong Khai, Thailand experiences an extreme UV Index of 14, with a burn time of just 10 minutes. This marks the continuation of a summer trend that began in February and remains consistent through September. Notably, the UV Index remains at its peak, alongside July and August, indicating intense sun exposure during these months. As part of a yearly pattern, this highlights the importance of sun safety measures, especially during the high-risk months from February through October. Travelers and locals alike should take precautions against harmful UV rays to protect their skin. For more information on sun safety, visit Nong Khai UV Index.

Maximum UV Index Levels in Nong Khai for September

The chart shows the monthly maximum UV Index (UVI) for Nong Khai 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 Nong Khai typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131414131414141298
Data source: Nong Khai 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 Nong Khai

As the summer wanes, September sunshine in Nong Khai offers a delightful contrast to the preceding months. With 276 hours of glorious sunlight, it strikes a balance between the summer peak of 318 hours in March and the gentle decline of 250 hours in August. This trend showcases the gradual transition towards the more temperate months of October and November, which promise around 300 and 305 hours of sunshine respectively. September serves as a refreshing bridge, maintaining a vibrant atmosphere while hinting at the cooler weather to come, making it an inviting time for both locals and visitors to bask in the sun-drenched beauty of this charming Thai locale.

Monthly Sunshine Duration in Nong Khai: September Highlighted

The September sunshine duration represents the total number of hours Nong Khai 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.
JanFebMarAprMayJunJulAugSepOctNovDec254h293h318h311h309h274h269h250h276h300h305h311h
Data source: Nong Khai September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Nong Khai During September

In Nong Khai, Thailand, the likelihood of sunny weather in September takes a notable dip, with only a 19% chance of sunshine. This trend marks a significant contrast to earlier months, particularly the sun-drenched January and February, which boast probabilities of 83% and 87% respectively. As the region transitions from the sweltering summer into the rainy season, the sunshine diminishes, peaking in April and May at just 31% and 39%. The persistent cloud cover throughout the summer culminates in the notably low chances seen in September, underscoring it as one of the lesser sunlit months in Nong Khai. As temperatures begin to cool in October, the sunny days gradually improve, hinting at a return to more favorable weather conditions.

Percentage of Sunny Days in September in Nong Khai

The chart illustrates the percentage of sunny days in Nong Khai 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 Nong Khai experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec83%87%69%31%39%14%16%14%19%31%66%87%
Data source: Nong Khai September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Nong Khai in September

In Nong Khai, Thailand, the daylight duration shows a distinct pattern as the year progresses. Starting with 11 hours of daylight in both January and February, the duration gradually increases to 12 hours by March and holds steady until the end of August. As summer approaches, daylight peaks at 13 hours in June and July, reflecting the region's warm climate. However, as autumn sets in, daylight begins to taper off, returning to 12 hours in September before dropping back to 11 hours in October, November, and December. This rhythmic ebb and flow of daylight not only marks the change of seasons but also enhances the region's vibrant natural beauty, inviting locals and visitors alike to make the most of its sunny days.

Average Daylight Hours in Nong Khai for September

The chart illustrates the variation in daylight duration in Nong Khai throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 10m11h 32m12h 2m12h 32m12h 57m13h 10m13h 3m12h 41m12h 12m11h 42m11h 16m11h 4m
Data source: Nong Khai daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Nong Khai

In September, the gentle breeze of Nong Khai averages around 1.6 m/s (4 mph), reflecting a slight dip from the previous months of summer. As the rainy season approaches, the winds begin to mellow, continuing the trend set in the hotter months of April and May, where they reached their seasonal low at 1.4 m/s (3 mph). This transition into September sees the winds gaining a touch more vigor compared to the earlier summer, but still holding a soft whisper as they playfully weave through the lush landscapes. As the year progresses, the wind speeds remain relatively stable, often circling back to the 2.0 m/s (4 mph) range by October and November, illustrating the consistent, soothing nature of Nong Khai's climate.

Average September Wind Speed in Nong Khai

The chart displays monthly wind speed patterns in Nong Khai, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.11.91.91.51.41.82.01.81.6 m/s1.61.92.0
Data source: Nong Khai September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Nong Khai Compares to Other Months

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

September and January exhibit stark contrasts in weather patterns. September is characterized by high temperatures, with a minimum of 22°C (73°F) and an average of 28°C (83°F), reaching a maximum of 36°C (98°F). Additionally, this month experiences significant precipitation, totaling 260 mm (10.2 in) over 24 days, leading to high humidity levels of 86%. In contrast, January boasts much milder temperatures, with a minimum of 10°C (50°F) and an average of 23°C (74°F), peaking at 35°C (95°F). The month is notably dry, receiving only 4 mm (0.2 in) of precipitation across 1 day, and the humidity drops to 59%. For a closer look at January's weather specifically, you can check Nong Khai weather in January.

When comparing the weather in September and February, we see distinct differences in temperature, precipitation, and humidity. September experiences higher temperatures, with a minimum of 22°C (73°F), an average of 28°C (83°F), and a maximum reaching 36°C (98°F). It is also characterized by significant rainfall, totaling 260 mm (10.2 in) across 24 days, alongside a high humidity level of 86%. In contrast, February presents a cooler climate, with a minimum temperature of 13°C (56°F), an average of 24°C (76°F), and peak temperatures soaring to 37°C (99°F). February is much drier, receiving only 12 mm (0.5 in) of precipitation over just one day, resulting in a more comfortable humidity level of 54%. For more specific details about February weather, you can visit Nong Khai weather in February.

September and March present contrasting weather conditions. September experiences warmer minimum temperatures averaging 22°C (73°F) and can peak at 36°C (98°F), coupled with high humidity at 86% and frequent precipitation, totaling 260 mm (10.2 in) over 24 days. In contrast, March has a slightly cooler minimum temperature of 17°C (62°F) and can reach maximums of 39°C (103°F), but with significantly lower humidity at 45% and much less rainfall, amounting to only 36 mm (1.4 in) over just 6 days. For a detailed look at what to expect, check out Nong Khai weather in March.

When comparing the weather in September and April, notable differences emerge. September experiences warmer temperatures, with a minimum of 22°C (73°F) and an average high of 36°C (98°F), contrasted with April, which has a lower minimum of 17°C (63°F) and can peak at a scorching 41°C (106°F). Despite April's higher maximum temperature, it sees significantly less rainfall, with only 68 mm (2.7 in) over 9 days, while September is characterized by heavy precipitation, totaling 260 mm (10.2 in) across 24 days and high humidity at 86%. For a more detailed look at April weather specifically, you can visit Nong Khai weather in April.

In comparing the weather between September and May, September tends to be characterized by a slightly lower average temperature, ranging from a minimum of 22°C (73°F) to a maximum of 36°C (98°F), while May sees higher maximum temperatures, peaking at 41°C (106°F). Additionally, September experiences significantly more rainfall, with a total precipitation of 260 mm (10.2 in) over 24 days, compared to May's 199 mm (7.8 in) across 21 days. Humidity levels are also markedly different; September has a high humidity of 86%, whereas May's humidity is more moderate at 65%. For a closer look at May's weather specifics, you can check Nong Khai weather in May.

In comparing the weather of September and June, both months feature warm temperatures, with September's average at 28°C (83°F) and June slightly warmer at 29°C (85°F). June experiences higher maximum temperatures, soaring to 39°C (102°F), compared to September's peak of 36°C (98°F). Precipitation levels are also notable; June sees 310 mm (12.2 in) over 25 days, while September has 260 mm (10.2 in) across 24 days, making both months quite rainy. Interestingly, despite September's higher humidity at 86%, June is not far behind at 82%. For more detailed insights, visit Nong Khai weather in June.

When comparing the weather in September and July, both months exhibit high temperatures and humidity levels, typical for tropical climates. September has a minimum temperature of 22°C (73°F) and an average temperature of 28°C (83°F), while July starts a bit warmer with a minimum of 24°C (76°F) and an average of 29°C (84°F). Precipitation is significantly higher in July, with 351 mm (13.8 in) over 26 days, compared to September's 260 mm (10.2 in) across 24 days. Additionally, humidity levels slightly increase from July's 90% to September's 86%, contributing to the overall muggy conditions during both months. For a more detailed look at the specific weather patterns in July, you can check Nong Khai weather in July.

In comparing the weather of September and August, we notice that both months have similar average temperatures, with September showing a slightly cooler minimum temperature of 22°C (73°F) compared to August's 24°C (76°F). However, August experiences a higher maximum temperature of 37°C (98°F) versus September's 36°C (98°F). Precipitation is significantly more in August, totaling 410 mm (16.1 in) over 26 days, while September sees a reduction to 260 mm (10.2 in) spread over 24 days. Humidity levels are also higher in August at 92% compared to September's 86%. For a more detailed look, check out Nong Khai weather in August.

In September, the weather is typically warm and humid, with an average temperature of 28°C (83°F) and maximum highs reaching up to 36°C (98°F). However, it can be quite wet, as the month experiences significant rainfall of 260 mm (10.2 in) over 24 days, contributing to a high humidity level of 86%.

In contrast, October sees slightly cooler temperatures, with a minimum of 20°C (68°F) and an average temperature that remains stable at 28°C (82°F). The month also brings a notable decrease in precipitation, dropping to 124 mm (4.9 in) over 16 days, which results in lower humidity at 80%. For more detailed weather insights, you can visit Nong Khai weather in October.

In September, the weather is notably warmer and more humid, with an average temperature of 28°C (83°F) and a high reaching up to 36°C (98°F). The month experiences significant rainfall, with 260 mm (10.2 in) of precipitation spread over 24 days, contributing to a humidity level of 86%. In contrast, November brings a slight drop in temperatures, averaging 26°C (79°F) with minimums around 17°C (62°F), while still maintaining a maximum of 36°C (97°F). The month is markedly drier, with only 8 mm (0.3 in) of precipitation over just 3 days and a decrease in humidity to 72%. For more detailed information on November's climate, you can visit Nong Khai weather in November.

In September, the weather is characterized by high temperatures, with a minimum of 22°C (73°F) and an average of 28°C (83°F), reaching up to 36°C (98°F) on hotter days. This month experiences significant rainfall, with around 260 mm (10.2 in) spread over 24 days, contributing to a high humidity level of 86%. In contrast, December offers a much cooler climate, with temperatures ranging from a minimum of 9°C (48°F) to an average of 23°C (73°F), peaking at 35°C (94°F). Precipitation drops drastically to just 6 mm (0.2 in) over only 2 days, and humidity decreases to 66%. For a detailed look at December's weather, you can visit Nong Khai weather in December.

Compare Nong Khai's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Nong Khai

In September, Nong Khai experiences a shift in weather patterns that set it apart from other months. With an average temperature hovering around 28°C (83°F), this month showcases a lush, tropical atmosphere, significantly marked by high humidity levels of 86%. Unlike the drier spells of the preceding months, September brings frequent showers, contributing to a notable precipitation of 260 mm (10.2 in) over approximately 24 days. This cocktail of warmth and moisture creates a vibrant environment, ideal for those who appreciate lush landscapes and lush greenery. For a deeper understanding of what to expect, explore the full details at Nong Khai Climate.