September Weather in Cha-am, Thailand

Last updated: August 27, 2025

In September, Cha-am, Thailand, experiences warm and humid conditions, with temperatures peaking at a maximum of 34°C (94°F) and averaging around 28°C (83°F). The month is characterized by significant rainfall, accumulating to 155 mm (6.1 in) over approximately 22 days, making it one of the wetter periods of the year. With humidity levels soaring to 87%, visitors should prepare for a tropical climate, ideal for those who enjoy lush landscapes and vibrant scenery, despite the potential for frequent showers.

September Temperature in Cha-am

September in Cha-am, Thailand, marks a continuation of the warm, tropical vibe that characterizes most of the year. With minimum temperatures around 25°C (77°F) and average highs reaching up to 34°C (94°F), visitors can expect a slightly humid but pleasantly warm climate. This month tends to hover close to the averages of August, showcasing a consistent pattern of balmy weather. The sea breeze provides a refreshing touch to the tropical heat, making it an ideal time for beachgoers. As the month progresses, the crispness of October begins to loom, hinting at a gradual cooling trend that will soon follow, but for now, September offers a vibrant tapestry of sunshine and warmth, perfect for enjoying the stunning coastal scenery.

September Weather in Cha-am: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Cha-am, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cha-am, 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).
JanFebMarAprMayJunJulAugSepOctNovDec808184858585848383828280
Data source: Temperature data for Cha-am 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 Cha-am

In September, Cha-am, Thailand, experiences a notable surge in precipitation, with an impressive 155 mm (6.1 in) of rain over 22 days. This marks a significant increase from the previous months, as the rainy season reaches its peak. The consistent downpours contribute to the lush greenery of the region, painting a vibrant landscape that contrasts beautifully with the typical dry spells at the beginning of the year. The trend suggests that while early months see minimal rainfall—like January's 41 mm—September showcases the intensity of the monsoon, paving the way for the even higher rainfall expected in October. This seasonal shift creates a dynamic environment, drawing locals and visitors alike to embrace the rejuvenating essence of nature during this time.

September Precipitation Trends in Cha-am

The chart displays monthly precipitation patterns in Cha-am, 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 Cha-am, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec41153787103689510115523410628
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Cha-am

In Cha-am, Thailand, September marks the tail end of the wet season, with humidity levels reaching 87%. This gradual decline from the peak of 90% in August signals a subtle shift as the monsoon begins to wane. Observing the yearly trend, it's clear that humidity steadily increases from January's relatively comfortable 58%, peaking in mid-summer months of June and July. After August, while September maintains a high level of humidity, it slightly lowers as the region transitions into October's 83%. This pattern underscores the characteristic tropical climate of Cha-am, where humidity swings notably reflect the seasonal shifts and impact outdoor activities throughout the year.

September Average Humidity in Cha-am

This chart illustrates the average monthly humidity levels in Cha-am, 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 Cha-am is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec58%59%62%69%79%87%89%90%87%83%77%66%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cha-am

In September, Cha-am, Thailand, experiences a consistent UV Index of 14, marking the month among those with the highest solar exposure. Classified as extreme, this persistent level of UV radiation means that sunburn can occur in just 10 minutes of unprotected skin exposure. Interestingly, the UV Index remains steady from July through September, indicating a significant trend of intense sunlight during these months. This pattern emphasizes the need for effective sun protection measures for both residents and visitors alike. As temperatures remain high, staying informed is crucial—learn more about the UV Index in Cha-am here: Cha-am UV Index.

Maximum UV Index Levels in Cha-am for September

The chart shows the monthly maximum UV Index (UVI) for Cha-am 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 Cha-am typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11131414141314141413109
Data source: Cha-am 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 Cha-am

September in Cha-am, Thailand, greets visitors with 275 hours of sunshine, offering a delightful blend of warmth and powerful rays, even as summer begins to wane. While this marks a slight dip from the summer months of June and July, the sun still shines brightly, creating a perfect backdrop for beach outings and leisurely strolls. This trend of gradually diminishing sunlight continues into October, yet visitors can still expect pleasant weather with 285 hours of sunlight. Overall, September remains a sweet spot for those seeking to enjoy the tail end of the sunny season, as the vibrant coastal town embraces the changing seasons with its characteristic charm.

Monthly Sunshine Duration in Cha-am: September Highlighted

The September sunshine duration represents the total number of hours Cha-am 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.
JanFebMarAprMayJunJulAugSepOctNovDec252h303h340h324h325h308h288h284h275h285h297h315h
Data source: Cha-am September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Cha-am During September

In September, the likelihood of sunny weather in Cha-am, Thailand, is quite low, with only a 9% chance of clear skies. This trend of diminished sunshine continues from the previous months, where July and August see similarly dismal probabilities of 11% and 8% respectively. As the rainy season peaks during this time, it becomes evident that if you're planning a visit in September, you might want to brace for occasional showers rather than sun-soaked days. The considerably higher chances of sunshine seen earlier in the year, such as 75% in February, serve as a stark contrast to the gloomy outlook of late summer, creating a clear seasonal pattern of decreasing sunlight as the year progresses.

Percentage of Sunny Days in September in Cha-am

The chart illustrates the percentage of sunny days in Cha-am 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 Cha-am experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec58%76%63%22%34%15%11%8%9%13%22%59%
Data source: Cha-am September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Cha-am in September

In Cha-am, Thailand, the pattern of daylight duration exhibits a gradual shift throughout the year. The months of January and February start with a modest 11 hours of daylight, but as spring approaches in March, the days lengthen, reaching 12 hours from March through September. This consistent duration of 12 hours signifies the region's tropical climate, where daylight remains steady as the wet season approaches. As October ushers in the transition to cooler months, daylight dips back to 11 hours, paralleling the shorter days of November and December. This rhythmic cycle of light not only marks the changing seasons but also influences the vibrant lifestyle and activities of the local community.

Average Daylight Hours in Cha-am for September

The chart illustrates the variation in daylight duration in Cha-am throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 27m11h 42m12h 3m12h 24m12h 42m12h 51m12h 46m12h 30m12h 10m11h 49m11h 31m11h 22m
Data source: Cha-am daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Cha-am

As September unfolds in Cha-am, Thailand, the gentle breezes begin to soften, marking a transition with an average wind speed of just 2.3 m/s (5 mph). This decline in wind intensity is noteworthy when observed against the backdrop of more vigorous months like December, which boasts an energetic 4.3 m/s (10 mph). Following the summer months, where winds maintain a steady pace around 3.2 m/s, September's calmer conditions create an inviting atmosphere for relaxation along the coast. As the year progresses into October, we can expect a slight uptick in wind speed, hinting at the seasonal changes to come. This rhythm of wind patterns not only enhances the charm of Cha-am but also beckons travelers seeking both serenity and adventure.

Average September Wind Speed in Cha-am

The chart displays monthly wind speed patterns in Cha-am, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.73.13.82.63.23.23.23.12.3 m/s2.93.64.3
Data source: Cha-am September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Cha-am Compares to Other Months

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

In September, the weather is characterized by higher temperatures, with minimums around 25°C (77°F) and maximums reaching up to 34°C (94°F). The month also sees significant rainfall, averaging 155 mm (6.1 in) over 22 days, combined with high humidity levels at 87%. In contrast, January experiences milder conditions, with minimum temperatures dropping to 19°C (67°F) and maximums peaking at 32°C (89°F). Additionally, January is much drier, with only 41 mm (1.6 in) of precipitation across just 3 days and a more comfortable humidity level of 58%. For a more detailed look at weather patterns, you can check Cha-am weather in January.

September weather is characterized by higher temperatures, with minimums around 25°C and averages peaking at 28°C, often reaching a maximum of 34°C. This month experiences significant rainfall, totaling 155 mm over 22 days, coupled with high humidity levels of 87%. In contrast, February presents a milder climate with minimum temperatures of 22°C, averaging 27°C and maxing out at 32°C. Precipitation drops dramatically to just 15 mm over 3 days, and humidity is considerably lower at 59%. For a more detailed overview of February weather, you can check Cha-am weather in February.

September and March exhibit notable differences in weather patterns. September tends to be more humid and wetter, with an average temperature of 28°C (83°F) and precipitation reaching 155 mm (6.1 in) over 22 days, resulting in a high humidity of 87%. In contrast, March is characterized by slightly warmer conditions, with an average temperature of 29°C (84°F), but significantly less rainfall at just 37 mm (1.4 in) over only 3 days, leading to a lower humidity level of 62%. For more information about the weather in March, visit Cha-am weather in March.

In comparing the weather between September and April, September tends to be slightly cooler with average temperatures ranging from a minimum of 25°C (77°F) to a maximum of 34°C (94°F), while April experiences average temperatures that range from a minimum of 23°C (74°F) to a maximum of 35°C (95°F). Additionally, September sees significantly higher rainfall, with 155 mm (6.1 in) over 22 days, compared to April's 86 mm (3.4 in) over just 11 days. Humidity levels also differ, with September's humidity at a high 87%, contrasting with April's more comfortable level of 69%. For those specifically interested in April weather, you can find more details here: Cha-am weather in April.

In September, the weather is characterized by slightly cooler average temperatures, ranging from a minimum of 25°C (77°F) to a maximum of 34°C (94°F), compared to May, which boasts warmer averages with temperatures between 25°C (78°F) and 35°C (96°F). September also experiences significantly more precipitation, with 155 mm (6.1 in) over 22 days, whereas May sees less rainfall at 103 mm (4.0 in) across 16 days. Additionally, September's humidity is notably higher at 87%, compared to May's more comfortable 79%. This contrast highlights September as a month more prone to rain and humidity, while May tends to be drier and warmer. For more detailed insights, visit Cha-am weather in May.

September and June both feature warm temperatures and high humidity, making them characteristic of a tropical climate. In June, the average temperature ranges from a minimum of 26°C (79°F) to a maximum of 35°C (95°F), with a total precipitation of 68 mm (2.7 in) over 14 days. In contrast, September experiences slightly cooler temperatures, with averages between 25°C (77°F) and 34°C (94°F) but sees a significant increase in rainfall, totaling 155 mm (6.1 in) over 22 days. This heightened precipitation in September can lead to a more overcast environment compared to the sunnier June weather. For more details on June weather specifics, you can visit Cha-am weather in June.

In comparing the weather of September and July, we see that both months experience warm temperatures, with July having an average of 29°C (84°F) compared to September's average of 28°C (83°F). Both months share similar maximum temperatures of 34°C (94°F), but July's minimum temperature is slightly higher at 25°C (78°F), while September's minimum remains at 25°C (77°F). Notably, September sees significantly more rainfall, with 155 mm (6.1 in) spread over 22 days, compared to July's 95 mm (3.8 in) over 18 days. The humidity is relatively consistent, being slightly higher in September at 87% versus 89% in July. For more detailed information, you can refer to Cha-am weather in July.

In comparing the weather of September and August, we find that both months have similar temperature patterns, with minimum temperatures around 25°C (77°F) and average temperatures at 28°C (83°F). However, September experiences slightly more warmth on maximum days, peaking at 34°C (94°F) compared to August's 34°C (93°F). Notably, September also sees increased precipitation, amounting to 155 mm (6.1 in) over 22 rainy days, whereas August records 101 mm (4.0 in) spread across 19 days. Additionally, humidity levels are marginally lower in September at 87%, compared to 90% in August. For more detailed insights on August weather, you can check this link: Cha-am weather in August.

In comparing the weather of September and October, both months exhibit warm temperatures, with September averaging 28°C (83°F) and October slightly cooler at 28°C (82°F). However, September experiences a maximum of 34°C (94°F), while October peaks at 33°C (91°F). Notably, October sees increased precipitation, with 234 mm (9.2 in) over 24 days, compared to September's 155 mm (6.1 in) over 22 days. Humidity levels are also slightly lower in October at 83%, compared to September's 87%. For more detailed insights into the October weather, you can visit Cha-am weather in October.

In September, the weather is typically warmer and more humid, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 34°C (94°F) and an average of 28°C (83°F). The month experiences significant rainfall, with 155 mm (6.1 in) of precipitation spread over 22 days, contributing to a high humidity level of 87%. In contrast, November sees slightly cooler temperatures, with a minimum of 23°C (74°F), an average of 28°C (82°F), and a maximum of 32°C (90°F). Precipitation decreases to 106 mm (4.2 in) over just 13 days, and humidity drops to a more comfortable 77%. For more details on November weather, check out Cha-am weather in November.

In September, the weather is quite warm and humid, with average temperatures ranging from a minimum of 25°C (77°F) to a maximum of 34°C (94°F) and an average of 28°C (83°F). This month experiences significant rainfall, totaling 155 mm (6.1 in) across approximately 22 days, contributing to a high humidity level of 87%.

In contrast, December brings a noticeable shift in the climate, with cooler temperatures ranging from a minimum of 20°C (68°F) to a maximum of 31°C (89°F) and an average of 27°C (80°F). Rainfall is minimal during this month, amounting to only 28 mm (1.1 in) over just 4 days, resulting in lower humidity levels of 66%. For more details, you can check Cha-am weather in December.

Compare Cha-am's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Cha-am

As September unfolds in Cha-am, the weather presents a stark contrast to the drier months that precede it. With average temperatures hovering around a warm 28°C (83°F), the days are complemented by high humidity levels of 87%, creating a tropical ambiance. This month is characterized by significant rainfall, with precipitation recorded on over half the days, resulting in a total of 155 mm of rain. While the temperatures remain notably warm, the frequent showers provide a refreshing break from the heat, making September uniquely lush and vibrant. If you’re curious about how Cha-am's climate compares across the year, check out Cha-am Climate.