September Weather in Phuket, Thailand

Last updated: August 27, 2025

In September, Phuket, Thailand experiences a tropical embrace with maximum temperatures around 29°C (85°F) and an average of 27°C (81°F), making it ideal for those who relish warm weather. However, it's essential to be prepared for the high humidity at 84%, as well as an impressive 309 mm (12.2 in) of rainfall spread across 25 days. This month marks a significant period of the monsoon season, bringing lush greenery and a vibrant atmosphere to the island. Whether you’re exploring its stunning beaches or indulging in local culture, September in Phuket offers a unique blend of warmth and rejuvenating rain.

September Temperature in Phuket

In September, Phuket experiences a gradual cooling trend as the monsoon season continues, with temperatures hovering between a mild 25°C (77°F) and a comfortable 29°C (85°F). The average temperature remains steady at 27°C (81°F), mirroring the pleasant warmth felt throughout the preceding months. While highs dip slightly from the peak summer months, the balmy evenings and typical tropical humidity still invite visitors to enjoy the island's enchanting beaches and lush landscapes. This transitional month provides a balanced climate, making it an ideal time for adventurous travelers seeking to explore Phuket's vibrant culture and natural beauty while avoiding the summer crowds.

September Weather in Phuket: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Phuket, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Phuket, 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).
JanFebMarAprMayJunJulAugSepOctNovDec808182828282828281818180
Data source: Temperature data for Phuket 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 Phuket

September marks a peak in rainfall in Phuket, Thailand, with an impressive 309 mm (12.2 in) of precipitation spread over 25 days. This month stands out as the wettest of the year, reflecting the culmination of the monsoon season's intensity. As the island transitions from August's substantial 265 mm, the increase in rainfall not only intensifies the lush landscapes but also signals a consistent tendency towards more frequent rain during this period. The high number of rainy days emphasizes September's role as a defining month in Phuket's climate, where the showers play a crucial role in nurturing the region's vibrant flora and maintaining its tropical charm.

September Precipitation Trends in Phuket

The chart displays monthly precipitation patterns in Phuket, 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 Phuket, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec1111338166267275237265309319199124
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Phuket

In September, Phuket experiences its highest humidity of the year at 84%, marking a notable peak as the rainy season unfolds. This month typically sees a gradual rise in humidity, starting from 71% in April and climbing steadily, with a particularly sharp increase from 82% in August. The trend indicates that as summer transitions into fall, the air becomes increasingly saturated, contributing to the lush tropical environment the island is known for. This consistent humidity level, mirroring that of November and December, suggests that visitors should be prepared for a muggy climate, which can heighten the feeling of warmth throughout the day.

September Average Humidity in Phuket

This chart illustrates the average monthly humidity levels in Phuket, 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 Phuket is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%73%74%71%72%79%79%82%84%83%84%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Phuket

As September arrives in Phuket, Thailand, the UV Index remains at an impressive 14, marking it as an extreme level of solar radiation exposure. This consistency is a notable trend throughout the year, with peak values observed from March to May, where the UV Index reaches a maximum of 15. Even in the subtropical embrace of September, beachgoers must remain vigilant, as the recommended burn time stands at just 10 minutes. With a similar UV Index persisting into October, it’s essential to protect your skin by seeking shade and applying sunscreen regularly. For more detailed information, check out Phuket UV Index.

Maximum UV Index Levels in Phuket for September

The chart shows the monthly maximum UV Index (UVI) for Phuket 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 Phuket typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121415151413131414141211
Data source: Phuket 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 Phuket

As September rolls into Phuket, the island basks in a delightful 282 hours of sunshine, offering a radiant farewell to the peak summer months. While this marks a slight dip from the sun-drenched days of March, which boasts the highest average of 344 hours, it's still a splendid time to soak up the tropical vibes. The sunshine hours show a gradual decline from the bustling summer, where July and August gleam with 316 and 309 hours respectively. Yet, as the rainy season approaches, the golden rays in September serve as a warm reminder that there's still ample opportunity to enjoy the beach, explore vibrant markets, and indulge in fresh seafood. The charm of Phuket remains irresistible, even as the days begin to shorten slightly, ensuring visitors are treated to captivating sunsets and golden horizons.

Monthly Sunshine Duration in Phuket: September Highlighted

The September sunshine duration represents the total number of hours Phuket 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.
JanFebMarAprMayJunJulAugSepOctNovDec257h311h344h317h308h296h316h309h282h281h283h309h
Data source: Phuket September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Phuket During September

In September, the likelihood of sunny weather in Phuket, Thailand, diminishes significantly, with only a 10% chance of sunshine gracing the island. This trend reflects a notable shift as the monsoon season approaches, marking a stark contrast to the more favorable conditions seen in the earlier months, such as February with its 47% chance and March’s solid 40%. As the year progresses, the months leading up to September, like April and May, also showcase a decrease in sunny days, plummeting to a mere 15% by mid-year. Travelers seeking sunshine should be aware that September’s weather typically leans towards gray skies and rainfall, aligning with the island's seasonal patterns.

Percentage of Sunny Days in September in Phuket

The chart illustrates the percentage of sunny days in Phuket 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 Phuket experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec27%47%40%21%15%21%18%11%10%10%4%38%
Data source: Phuket September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Phuket in September

September in Phuket, Thailand, marks a continuation of the island's delightful twelve hours of daylight, a trend that began in March and remained consistent through the summer months. This steady duration allows for ample opportunities to bask in the tropical sun, explore lush landscapes, or enjoy vibrant beach life. While the daylight gradually recedes to eleven hours in October, September stands out as part of the sun-rich months, perfect for travelers seeking to relish the beauty of this paradise before the days begin to shorten. With warm breezes and plenty of sunshine, September is an ideal time to indulge in outdoor adventures and soak up the enchanting atmosphere of Phuket.

Average Daylight Hours in Phuket for September

The chart illustrates the variation in daylight duration in Phuket throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 42m11h 51m12h 4m12h 17m12h 28m12h 33m12h 30m12h 21m12h 8m11h 55m11h 45m11h 39m
Data source: Phuket daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Phuket

September in Phuket, Thailand, greets visitors with a gentle breeze, as the average wind speed settles around 4.2 m/s (9 mph). This month continues the trend of gradually decreasing winds observed since the peak summer months. While January and July boast stronger gusts at 5.4 m/s and 5.2 m/s, respectively, September calmly ushers in the fall with milder air, reflecting the transition from the vibrant summer to the quieter autumn. As the tropical climate envelops the island, the breeze carries hints of the approaching rain, making it an enchanting time for those seeking a less hectic atmosphere amidst the natural beauty of Phuket.

Average September Wind Speed in Phuket

The chart displays monthly wind speed patterns in Phuket, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.45.23.93.73.64.45.24.84.2 m/s4.43.64.7
Data source: Phuket September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Phuket Compares to Other Months

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

September and January in Phuket showcase a marked contrast in weather patterns. In September, temperatures range from a minimum of 25°C (78°F) to a maximum of 29°C (85°F), accompanied by high humidity at 84% and significant rainfall totaling 309 mm (12.2 in) over 25 days. In contrast, January offers slightly higher maximum temperatures of up to 30°C (86°F), but with decreased humidity at 76% and much less precipitation, averaging only 111 mm (4.4 in) across 9 days. For more details on January weather in Phuket, you can view Phuket weather in January.

In September, the weather tends to be quite humid and wet, with average temperatures around 27°C (81°F), minimal nighttime cooling, and frequent rainfall totaling 309 mm (12.2 in) over 25 days. The high humidity of 84% can make it feel even warmer. In contrast, February offers a drier and less humid climate, with temperatures averaging around 27°C (82°F) but reaching daytime highs of 31°C (88°F). This month typically sees only 13 mm (0.5 in) of precipitation across just 4 days, making it an ideal time for outdoor activities. For more information on what to expect, check out Phuket weather in February.

September and March present contrasting weather patterns. In September, the temperatures range from a minimum of 25°C (78°F) to a maximum of 29°C (85°F), with an average of 27°C (81°F). The month is marked by high humidity at 84% and significant rainfall, totaling 309 mm (12.2 in) over 25 days. In contrast, March tends to be warmer, with temperatures fluctuating between 26°C (78°F) and 31°C (89°F), averaging around 28°C (83°F). Additionally, it experiences much lighter rainfall, with only 38 mm (1.5 in) over just 8 days, and a lower humidity level of 74%. For a more detailed look at the weather in March, check out Phuket weather in March.

September and April in Phuket present notable differences in weather patterns. September maintains a warm temperature range with a minimum of 25°C (78°F) and an average of 27°C (81°F), peaking at 29°C (85°F). However, it is marked by high precipitation, averaging 309 mm (12.2 in) over 25 days and a humidity level of 84%, making the air quite heavy and tropical.

In contrast, April features a slightly higher temperature, with minimums around 25°C (78°F), an average of 28°C (83°F), and maximums reaching 31°C (87°F). The precipitation in April is significantly lower, with only 166 mm (6.6 in) spread over 20 days, coupled with a more comfortable humidity level of 71%. This makes April a drier and slightly warmer month compared to September. For those looking to understand April's conditions better, you can check Phuket weather in April.

In September, the weather tends to be quite warm, with average temperatures ranging from a minimum of 25°C (78°F) to a maximum of 29°C (85°F). However, this month also sees a substantial amount of precipitation, averaging 309 mm (12.2 in) over 25 days, along with high humidity levels of 84%. In contrast, May offers slightly higher temperatures, averaging between 26°C (79°F) and 30°C (87°F), but with less rainfall total, at 267 mm (10.5 in) over 27 days and a lower humidity of 72%. For more detailed information, check out Phuket weather in May.

In comparing the weather of September and June, both months showcase warm temperatures, with June slightly edging out in average temperature, reaching 28°C (83°F) compared to September's 27°C (81°F). Both months have a minimum temperature that remains consistent at 25°C (78°F). However, September experiences higher precipitation, with a total of 309 mm (12.2 in) over 25 days, compared to June's 275 mm (10.8 in) over 24 days. Humidity levels are also higher in September at 84%, while June has a more comfortable humidity level of 79%. For more detailed information, you can check out Phuket weather in June.

In comparing the weather of September and July, both months showcase similarly warm temperatures, with July having an average temperature of 28°C (83°F) and September slightly cooler at 27°C (81°F). Notably, the maximum temperatures for both months are identical at 29°C (85°F). However, September experiences significantly more rainfall, with a total precipitation of 309 mm (12.2 in) over 25 days, compared to July's 237 mm (9.3 in) over just 21 days. Additionally, September has higher humidity at 84%, whereas July's humidity is slightly lower at 79%. For a detailed overview of July's weather conditions, you can visit Phuket weather in July.

In August, temperatures remain consistently warm, with a minimum of 25°C (77°F) and an average of 28°C (82°F), peaking at a maximum of 30°C (86°F). The month experiences about 265 mm (10.4 in) of precipitation over 23 days, accompanied by a humidity level of 82%. In contrast, September sees a slight increase in rainfall, totaling 309 mm (12.2 in) across 25 days, while the temperatures remain similar, with a minimum of 25°C (78°F) and an average of 27°C (81°F). Humidity is slightly higher in September, at 84%. This indicates that while both months are characterized by warm weather, September is notably wetter and slightly more humid. For more detailed information about August weather, you can visit Phuket weather in August.

In September, the weather features a minimum temperature of 25°C (78°F) and an average of 27°C (81°F), with a maximum of 29°C (85°F). The month is characterized by significant rainfall, receiving 309 mm (12.2 in) over 25 days, accompanied by high humidity levels of 84%. In contrast, October sees similar minimum and average temperatures, but a slight increase in maximum temperature to 30°C (86°F). Rainfall also increases slightly to 319 mm (12.6 in) over 27 days, with humidity dropping slightly to 83%. For more information, check out Phuket weather in October.

In September, temperatures consistently hover between a minimum of 25°C (78°F) and a maximum of 29°C (85°F), with an average of 27°C (81°F). This month also sees significant rainfall, totaling 309 mm (12.2 in) across 25 days, contributing to a high humidity level of 84%. In contrast, November experiences slightly warmer temperatures, with a maximum reaching 30°C (87°F) while maintaining a similar minimum and average. The precipitation in November decreases to 199 mm (7.8 in) over 23 days, yet humidity remains the same at 84%. For more detailed information, you can explore Phuket weather in November.

In September, the weather is characterized by warm temperatures, with a minimum of 25°C (78°F), an average of 27°C (81°F), and a maximum of 29°C (85°F). However, this month also experiences significant rainfall, totaling 309 mm (12.2 in) over 25 days, resulting in a high humidity level of 84%.

In contrast, December offers a slightly warmer average temperature of 27°C (80°F) with a maximum of 30°C (87°F) but features less rainfall, accumulating only 124 mm (4.9 in) over 13 days. Despite this decrease in precipitation, humidity remains steady at 84%. For more detailed insights on weather conditions in December, you can visit Phuket weather in December.

Compare Phuket's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Phuket

In September, Phuket's weather presents a unique blend of warmth and moisture, characterized by the average temperature hovering around a comfortable 27°C (81°F). This month stands out, not just for its high humidity level of 84% but also for frequent showers, with rainfall occurring on about 25 days, totaling significant precipitation that sets it apart from the drier months of the year. While the warmth remains consistent, the increased rainfall during September makes it one of the wettest months, creating a lush and vibrant landscape. For a deeper dive into Phuket's climate patterns, visit Phuket Climate.