Last updated: August 27, 2025
In September, Pathum Wan, Thailand experiences a tropical climate marked by high humidity levels averaging 87%. Temperatures can soar to a maximum of 36°C (97°F), settling at a comfortable average of 29°C (84°F), while nighttime lows dip to around 24°C (76°F). However, this warm weather comes with significant rainfall, totaling 245 mm (9.6 in) over 24 days, making it one of the wetter months of the year. The combination of heat and moisture creates a lush environment but also poses challenges for outdoor activities.
In September, Pathum Wan, Thailand experiences a subtle shift in its tropical climate as temperatures begin to cool slightly while remaining comfortably warm. The minimum temperature hovers around 24°C (76°F), while the average is a pleasant 29°C (84°F), and the maximum reaches approximately 36°C (97°F). This month marks a slight decline from the sweltering highs of previous months, particularly May when temperatures peaked at 40°C (103°F). With more manageable heat, September provides a delightful opportunity to explore the vibrant culture and stunning landscapes of this bustling district. Despite warm days, the cooler nights create an inviting atmosphere for evening strolls and outdoor activities, making it an ideal time to visit.
September marks a significant peak in precipitation for Pathum Wan, Thailand, with 245 mm (9.6 in) of rainfall recorded over 24 days. This surge is part of the region's seasonal shift, as the monsoon influence intensifies, following the gradual increase seen from July and August. As compared to previous months, September's rainfall almost doubles that of August's 163 mm, underscoring its role as a pivotal month in the rainy season. This heightened precipitation continues into October, where 250 mm (9.9 in) is expected, albeit with a slight reduction in rainy days, indicating a shift towards more intense, shorter rain events. This pattern highlights an essential water source for the region while also illustrating the dynamic weather fluctuations common in the tropics.
In September, Pathum Wan experiences a notable humidity level of 87%, maintaining a trend of high moisture that began in mid-year. Following the peak months of July and August, which recorded 86% and 88% respectively, September sees a slight decrease but remains comfortably humid. This month transitions from the heavy rains of the monsoon season, creating a tropical atmosphere that can feel particularly sultry as temperatures also linger. As we move into October, humidity will relax to 83%, but the overall trend clearly illustrates a summer season replete with steamy conditions, making September a quintessential month for experiencing the lushness of Thailand’s climate.
As September rolls in Pathum Wan, Thailand, the UV Index stands at 13, placing it firmly in the extreme exposure category. This month follows a trend of high UV levels that the region experiences from January through August, where the index consistently hovers around 13 to 14. Despite a slight dip from the peak levels observed earlier in the year, the burn time remains a swift 10 minutes. As autumn approaches, it's crucial for residents and visitors to maintain sun safety practices, as even during this transitional month, the threat of sunburn is significant. For more detailed insights, visit Pathum Wan UV Index.
UV Risk Categories
In September, Pathum Wan, Thailand, enjoys approximately 268 hours of sunshine, marking a decline from the peak brightness of the earlier months. The year began with a radiant 251 hours in January, steadily climbing to a vibrant 336 hours in March, before tapering off in the subsequent months. As the rainy season approaches, the sun begins to take a back seat, with sunshine hours gradually decreasing from August's 280 hours. This gentle decline symbolizes the transition into the wetter months, setting the stage for the lush greenery that characterizes the region. Despite September’s reduction in sunlight, the warmth remains inviting, embodying the tropical charm of Thailand before the onset of more humid days in October.
In Pathum Wan, Thailand, the likelihood of sunny weather in September is notably low, with only a 10% chance of sun. This aligns with a persistent trend of declining sunshine as the monsoon season takes hold during the mid-year months. Following the relatively brighter months of January and February, where the chances of sunshine peak at 58% and 76% respectively, the outlook deteriorates from March onward. As the rainy season progresses, months like August and September bring minimal sun exposure, highlighting a significant dip in favorable weather conditions. Overall, if you're planning activities for September, be prepared for more cloud cover than clear skies.
In Pathum Wan, Thailand, the daylight duration in September reflects a consistent trend that has characterized the region throughout the year. With 12 hours of daylight, September joins the ranks of several months—including March through August—where the sun generously bathes the area in light. This pattern indicates a stable climate that promotes vibrant outdoor activities and a rich natural environment. As the year transitions into October, daylight hours begin to diminish, returning to 11 hours by month's end. Overall, the steady increase to a peak of 12 hours during the middle months illustrates the beauty of Thailand's tropical climate, allowing residents and visitors alike to enjoy an abundance of sunlight.
As September unfolds in Pathum Wan, Thailand, the landscape is embraced by a gentle breeze, with average wind speeds settling at 2.0 m/s (5 mph). This mild shift marks a slight decrease from the lively currents of 3.0 m/s (7 mph) seen in both March and June, indicating the start of a calmer phase as the monsoon season begins to wane. While the winds may be softer this month, September still maintains a refreshing quality, nestled between the breezy months of July and August, which offered higher sustained speeds of 6 mph. As temperatures begin to dip gently alongside the wind, the atmosphere becomes not only cooler but also more inviting, setting the stage for the vibrant fall festivities ahead.
Weather in Pathum Wan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Pathum Wan, focusing on differences in temperature, rainfall, humidity, and UV levels.
September weather is characterized by higher temperatures and significant humidity, with average highs reaching 29°C (84°F) and a maximum of 36°C (97°F). The month experiences considerable rainfall, with 245 mm (9.6 in) of precipitation spread over 24 days, resulting in a muggy atmosphere with humidity levels around 87%. In contrast, January offers a more temperate climate, with an average temperature of 27°C (81°F) and maximums up to 35°C (94°F). Rainfall is considerably lower at 29 mm (1.1 in), only occurring over 3 days, while humidity drops to a comfortable 59%, making it a more pleasant time of year. For a detailed look at January weather specifics, visit Pathum Wan weather in January.
In September, the weather is notably warmer and more humid, with average temperatures ranging from 24°C (76°F) to a maximum of 36°C (97°F) and an average humidity of 87%. This month sees significant rainfall, with 245 mm (9.6 inches) of precipitation over approximately 24 days, making it one of the wettest months. In contrast, February offers a more moderate climate, where temperatures range from a minimum of 19°C (66°F) to a maximum of 35°C (96°F) with lower humidity at 58%. Additionally, February experiences minimal rainfall, totaling only 14 mm (0.5 inches) over about 3 days. For more detailed information about February weather specifically, you can check Pathum Wan weather in February.
September and March exhibit distinct weather patterns, reflecting the transition between the rainy and dry seasons. 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 significant rainfall, accumulating 245 mm (9.6 in) over 24 days. In contrast, March offers slightly lower humidity at 61% and milder precipitation, with only 44 mm (1.7 in) over 5 days. Temperatures in March are comparable, with a minimum of 22°C (72°F), an average of 30°C (86°F), and a maximum of 37°C (99°F). For a more detailed look at the weather specifics, you can check out Pathum Wan weather in March.
In comparing the weather between September and April, we see distinct differences in temperature and precipitation. September boasts daily 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). However, it is also one of the wettest months, experiencing heavy rainfall with 245 mm (9.6 in) over 24 days and high humidity at 87%. In contrast, April features slightly cooler mornings with a minimum of 21°C (70°F) and reaches higher daytime temperatures, peaking at 38°C (100°F) and averaging 30°C (87°F). The month sees significantly less rainfall, totaling 107 mm (4.2 in) over just 12 days, accompanied by lower humidity levels of 70%. For more detailed information, you can check Pathum Wan weather in April.
In comparing the weather of September and May, we see clear distinctions in temperature and precipitation patterns. September averages a high of 29°C (84°F) with maximum temperatures reaching up to 36°C (97°F), while May features slightly higher temperatures overall, peaking at 40°C (103°F) and averaging 30°C (87°F). However, September is marked by more significant rainfall, totaling 245 mm (9.6 in) over 24 days, compared to May's 142 mm (5.6 in) across 19 rainy days. Humidity levels are also more pronounced in September at 87%, while May remains lower at 80%. For a closer look at specific weather details, you can visit Pathum Wan weather in May.
In comparing September and June weather, both months experience warm temperatures, with June having a slightly higher average temperature of 30°C (86°F) compared to September's 29°C (84°F). However, September tends to be more humid at 87%, while June is slightly less humid at 85%. Notably, September sees significantly more precipitation, with 245 mm (9.6 in) over 24 days, compared to June's 112 mm (4.4 in) over 22 days. This makes September a wetter month overall. For more detailed information on June weather, check out Pathum Wan weather in June.
In comparing the weather of September and July, we observe that both months have similar average temperatures, with September showing a minimum of 24°C (76°F) and a maximum of 36°C (97°F), while July has a slightly higher minimum of 25°C (78°F) and a maximum of 37°C (99°F). However, September experiences significantly more rainfall, with 245 mm (9.6 in) spread over 24 days, compared to July's 159 mm (6.2 in) over 26 days. Humidity levels are also quite similar, with September at 87% and July at 86%. For more detailed weather insights for July, you can refer to Pathum Wan weather in July.
In September, the weather remains warm with an average temperature of 29°C (84°F), similar to August, which also averages 29°C (85°F). However, September experiences slightly lower minimum temperatures at 24°C (76°F) compared to August's 25°C (77°F). Notably, September sees increased precipitation, with 245 mm (9.6 in) of rain falling over 24 days, surpassing August's 163 mm (6.4 in) over 23 days. Humidity levels are also comparable, with September at 87% and August at 88%. For more detailed weather insights, you can check Pathum Wan weather in August.
In September, the weather is characterized by a slightly warmer range, with minimum temperatures around 24°C (76°F) and maximums reaching up to 36°C (97°F). The month also sees considerable rainfall, with a total precipitation of 245 mm (9.6 in) over 24 days, contributing to a high humidity level of 87%. Conversely, October experiences a minor decrease in temperature, with minimums at 23°C (74°F) and maximums peaking at 35°C (96°F). Although precipitation increases slightly to 250 mm (9.9 in), it occurs over fewer days, totaling 21 days, resulting in a lower humidity level of 83%. For more detailed weather information, you can visit Pathum Wan weather in October.
In September, the weather tends to be warmer and significantly wetter compared to November, with average temperatures around 29°C (84°F) and precipitation reaching 245 mm (9.6 in) over 24 days. The high humidity of 87% makes it feel particularly muggy. In contrast, November sees a slight decrease in temperature, with averages at 28°C (83°F) and much lower precipitation of 61 mm (2.4 in) over just 9 days, along with reduced humidity at 78%. This transition makes November a more comfortable month in terms of weather conditions. For more detailed insights, you can check Pathum Wan weather in November.
In September, the weather is characterized by high temperatures, ranging from a minimum of 24°C (76°F) to a maximum of 36°C (97°F), with an average temperature of 29°C (84°F). This month also sees significant rainfall, with 245 mm (9.6 in) of precipitation spread over 24 days, contributing to a humid atmosphere with a humidity level of 87%. In contrast, December offers a much milder climate, featuring a minimum temperature of 15°C (59°F) and a high of 35°C (95°F), averaging at 27°C (80°F). Precipitation drops dramatically to just 24 mm (0.9 in) over only 2 days, and humidity decreases to 70%, making December a more comfortable time for outdoor activities. For more detailed insights into weather conditions during this month, you can check Pathum Wan weather in December.
September in Pathum Wan showcases a significant shift in weather patterns compared to other months. With high humidity levels averaging around 87%, this month feels much more oppressive, while frequent rains contribute to a notable increase in precipitation—occurring on nearly 24 days. The temperatures remain warm and pleasant, with averages hovering around 29°C (84°F), but the contrast with both the preceding dry spells and the upcoming cooler months becomes stark. If you're planning to visit during this time, be prepared for those tropical downpours and make sure to check out the detailed insights at Pathum Wan Climate.