September Weather in Thimphu, Bhutan

Last updated: August 21, 2025

In September, Thimphu, Bhutan experiences a refreshing transition into autumn with temperatures ranging from a maximum of 23°C (74°F) to a minimum of 8°C (46°F), resulting in a comfortable average of 15°C (59°F). The month is characterized by high humidity levels at 93%, fostering a lush and vibrant landscape. However, with an impressive precipitation total of 316 mm (12.4 in) over an average of 28 days, visitors should be prepared for frequent showers, making it a unique time to experience the town's natural beauty amidst the misty skies.

September Temperature in Thimphu

In September, Thimphu, Bhutan, experiences a pleasant transition into autumn, with temperatures beginning to cool from the warmer summer months. The average temperature sits at a comfortable 15°C (59°F), while daytime highs reach around 23°C (74°F), making this a great time for outdoor adventures. Evenings bring a refreshing chill with lows of 8°C (46°F). This month marks a subtle shift, as temperatures gradually decline from the summer peak, setting the stage for the crisp, cool days of October. Overall, September offers a delightful blend of warmth and coolness, perfect for exploring the rich culture and breathtaking landscapes that Thimphu has to offer.

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

The chart illustrates September temperature patterns in Thimphu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Thimphu, 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).
JanFebMarAprMayJunJulAugSepOctNovDec343642485459606159524438
Data source: Temperature data for Thimphu 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 Thimphu

September in Thimphu marks a transition in the monsoon season, characterized by a noteworthy precipitation amount of 316 mm (12.4 in) over 28 rainy days. Though the rainfall is significant, it reflects a decline compared to the peak months of July and August, where Thimphu experienced 566 mm (22.3 in) and 385 mm (15.2 in) respectively. This decrease hints at the gradual retreat of the monsoon, paving the way for drier months ahead. Despite the reduction in rainfall, September remains one of the month’s heavier contributors, maintaining a lush landscape that heralds the onset of autumn. As the rains begin to taper, the city's vibrant greenery flourishes, showcasing Bhutan's captivating natural beauty.

September Precipitation Trends in Thimphu

The chart displays monthly precipitation patterns in Thimphu, 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 Thimphu, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec521001821932843665663853161526868
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Thimphu

In September, Thimphu experiences consistently high humidity, maintaining a level of 93% that mirrors the peaks seen in July and August. This elevated humidity trend marks the culmination of the monsoon season, as the region typically transitions from wetter months into drier ones. The high humidity levels provide a lush backdrop to the picturesque landscapes, while also hinting at the cooler, crisp air that accompanies the arrival of autumn in October, where humidity slightly declines to 88%. This gradual decrease continues into the later months of the year, indicating a shift towards drier conditions as winter approaches. Overall, September serves as a vivid reminder of the welcoming humidity that characterizes the heart of Bhutan’s rainy season.

September Average Humidity in Thimphu

This chart illustrates the average monthly humidity levels in Thimphu, 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 Thimphu is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec59%61%38%34%60%83%93%93%93%88%80%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Thimphu

In September, Thimphu experiences a UV Index of 14, categorizing the exposure as extreme with a burn time of just 10 minutes. This month continues the trend observed from May to August, where the UV levels consistently peaked at 16, reflecting a period of intense solar activity. Although September sees a slight decrease, the extreme classification remains, urging outdoor enthusiasts to stay vigilant against sun exposure. As the year progresses towards October, the UV Index begins to decline, but the lingering effects of summer sun remind us that protective measures are still essential. For more detailed information on the UV Index in Thimphu throughout the year, visit Thimphu UV Index.

Maximum UV Index Levels in Thimphu for September

The chart shows the monthly maximum UV Index (UVI) for Thimphu 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 Thimphu typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec810131416161615141297
Data source: Thimphu 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 Thimphu

As September unfolds in Thimphu, Bhutan, a charming transition occurs, revealing 249 hours of golden sunshine. This month sees a delightful increase from the rainy days of July, which only offered 183 hours, and follows August's gracious but modest 221 hours of sunlight. As summer gives way to autumn, the sunshine steadily climbs, showcasing Bhutan's unique climate rhythm. While the hours may dip from the peak of 334 hours in May, September's pleasant weather invites locals and travelers alike to enjoy the vibrant landscapes that emerge in the warm, gentle light. This gradual shift towards crisper days makes September a perfect time to explore the stunning natural beauty of the region.

Monthly Sunshine Duration in Thimphu: September Highlighted

The September sunshine duration represents the total number of hours Thimphu 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.
JanFebMarAprMayJunJulAugSepOctNovDec228h268h315h326h334h297h183h221h249h313h285h282h
Data source: Thimphu September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Thimphu During September

In Thimphu, Bhutan, the likelihood of sunny weather in September is a notable 23%, offering a glimmer of hope after a series of increasingly cloudy months. Following the dismal sunshine percentages of July and August, which plummet to a mere 4% and 2% respectively, September marks a subtle shift towards clearer skies, albeit still far from ideal. As the monsoon season recedes, the chance of sun begins to reemerge, setting the stage for the crisp, sunny days of October at 34%. Overall, while September might not be the sunniest month in Thimphu, it's a hopeful transition as the region gears up for a more favorable autumn.

Percentage of Sunny Days in September in Thimphu

The chart illustrates the percentage of sunny days in Thimphu 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 Thimphu experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec48%42%29%41%19%11%4%2%23%34%39%47%
Data source: Thimphu September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Thimphu in September

In September, Thimphu enjoys about 12 hours of daylight, marking a gentle decline from the peak of 13 hours experienced in the summer months. This transitional period signifies a shift as the lushness of summer begins to recede, paving the way for the cozy embrace of autumn. The daylight duration showcases a notable pattern: starting from 10 hours in January, it steadily rises until June, before plateauing during the vibrant summer months of May through August. As the year progresses, the hours gradually wane again, reflecting the natural rhythm of the seasons and inviting the warm colors of fall to envelop the landscape.

Average Daylight Hours in Thimphu for September

The chart illustrates the variation in daylight duration in Thimphu throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 36m11h 12m12h12h 48m13h 29m13h 50m13h 39m13h 4m12h 17m11h 28m10h 46m10h 25m
Data source: Thimphu daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Thimphu

As the monsoon winds begin to retreat in September, Thimphu experiences a subtle shift in its atmospheric embrace. The average wind speed lingers around 1.0 m/s (2 mph), marking a gentle breath in contrast to the stillness of the summer months. This transitional period hints at the whispered arrival of autumn, where the air remains tranquil yet anticipatory. Following the calmness of July and August, which saw the slowest winds of the year, September's breeze signals a gradual return to slightly more lively conditions. As the temperatures begin to cool, the wind offers a refreshing touch, setting the stage for the vibrant hues of fall to unfold across the landscape.

Average September Wind Speed in Thimphu

The chart displays monthly wind speed patterns in Thimphu, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.31.21.11.21.11.00.90.91.0 m/s1.01.21.1
Data source: Thimphu September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Thimphu Compares to Other Months

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

In comparing the weather of September and January, it’s clear that these months reflect stark contrasts. September experiences milder temperatures, with a minimum of 8°C (46°F) and an average of 15°C (59°F), reaching a maximum of 23°C (74°F). This month also sees significant rainfall, totaling 316 mm (12.4 in) over 28 days, contributing to a high humidity level of 93%. In contrast, January is characterized by much colder conditions, with temperatures dropping to a minimum of -11°C (13°F) and averaging just 1°C (34°F), peaking at 14°C (58°F). January is drier, with only 52 mm (2.1 in) of precipitation spread over 17 days and a lower humidity of 59%. For further details on January weather, you can read more here: Thimphu weather in January.

In September, the weather is generally much milder, with average temperatures ranging from a minimum of 8°C (46°F) to a maximum of 23°C (74°F), accompanied by high humidity levels of 93%. This month sees significant rainfall, totaling 316 mm (12.4 in) over 28 days, making the atmosphere feel quite damp. In contrast, February experiences significantly colder temperatures, with average lows of -13°C (10°F) and highs reaching only up to 15°C (60°F). The precipitation in February is much lower at 100 mm (4.0 in) spread over 22 days, while the humidity drops to a more comfortable 61%. For more specifics on February weather, you can check Thimphu weather in February.

When comparing the weather in September and March, a significant contrast emerges. September generally features milder temperatures with daily averages around 15°C (59°F) and highs reaching 23°C (74°F), coupled with high humidity levels at 93%. In contrast, March is chillier, with average temperatures at 6°C (42°F) and lows plummeting to -7°C (21°F). While both months experience frequent precipitation, March receives less overall rain, totaling 182 mm (7.2 in) across 29 days compared to September's 316 mm (12.4 in) over 28 days. This results in a much drier atmosphere in March, with only 38% humidity. For more detailed information about March weather, you can visit Thimphu weather in March.

September and April present contrasting weather patterns. In September, temperatures range from a minimum of 8°C (46°F) to a maximum of 23°C (74°F), with an average of 15°C (59°F). The month is notably wet, experiencing 316 mm (12.4 in) of precipitation over 28 days and high humidity at 93%. Conversely, April offers cooler temperatures, with a minimum of -2°C (29°F) and a maximum of 20°C (68°F), averaging 9°C (48°F). Precipitation is significantly lower at 193 mm (7.6 in), also over 28 days, but the humidity is much less oppressive at 34%. For more specific details on April's weather, you can check Thimphu weather in April.

In comparing the weather of September and May, it's evident that September experiences milder temperatures, with a minimum of 8°C (46°F) and an average of 15°C (59°F), while May has cooler temperatures, highlighted by a minimum of 2°C (36°F) and an average of 12°C (54°F). Both months share a maximum temperature of 23°C (74°F). However, September is significantly wetter, receiving 316 mm (12.4 in) of rainfall across 28 days, compared to May's 284 mm (11.2 in) over 30 days. Notably, the humidity in September is much higher at 93%, while May's humidity is a more comfortable 60%. For those looking to explore Thimphu's weather in May, further details can be found here: Thimphu weather in May.

When comparing the weather in September and June, we see some similarities and notable differences. Both months have an average temperature of 15°C (59°F), but June generally experiences slightly higher maximum temperatures, reaching up to 25°C (77°F) compared to September's 23°C (74°F). Precipitation is quite significant in both months, with June averaging 366 mm (14.4 in) over 29 days, while September sees 316 mm (12.4 in) over 28 days. Additionally, humidity levels in September are higher at 93%, compared to June's 83%, contributing to a more muggy atmosphere as summer transitions into autumn. For more details about the weather in June, you can visit Thimphu weather in June.

September weather shows a slight cooling trend compared to July, with minimum temperatures dropping from 11°C (52°F) to 8°C (46°F). Both months have the same maximum average temperature of 23°C (74°F), but September's overall average temperature is marginally lower at 15°C (59°F) versus July's 16°C (61°F). Precipitation is significantly higher in July, totaling 566 mm (22.3 in) over 31 days, while September experiences 316 mm (12.4 in) across 28 days, indicating a wetter July. Humidity remains constant at 93% in both months. For more detailed information, check out Thimphu weather in July.

In comparing the weather of September and August, we see a slight decrease in temperatures, with September showcasing a minimum of 8°C and an average of 15°C, while August starts with a minimum of 10°C and an average of 16°C. Maximum temperatures are also marginally lower in September, reaching up to 23°C compared to 24°C in August. In terms of precipitation, September experiences slightly less rainfall, totaling 316 mm over 28 days, whereas August has a higher total of 385 mm across 30 days. Interestingly, humidity levels remain constant at 93% for both months, creating a consistently damp atmosphere. For a more detailed look at weather conditions during this month, you can check Thimphu weather in August.

In September, the weather is characterized by relatively mild temperatures, with a minimum of 8°C (46°F) and a maximum of 23°C (74°F), leading to an average of 15°C (59°F). The month is marked by significant rainfall, totaling 316 mm (12.4 in) over 28 days, and high humidity levels at 93%. In contrast, October sees a noticeable drop in minimum temperatures, reaching as low as -2°C (29°F), with an average of 11°C (53°F) and a maximum remaining similar at 22°C (72°F). Precipitation decreases to 151 mm (6.0 in) spread over 24 days, accompanied by a slightly lower humidity of 88%. For more details on October weather patterns, you can check out Thimphu weather in October.

September and November present contrasting weather conditions. September typically experiences a milder climate, with temperatures ranging from a minimum of 8°C (46°F) to a maximum of 23°C (74°F) and an average of 15°C (59°F). However, it also brings significant rainfall, totaling 316 mm (12.4 in) over 28 days, along with high humidity levels at 93%. In contrast, November sees cooler temperatures, with a minimum of -3°C (26°F) and an average of 7°C (44°F), peaking at 19°C (66°F). The precipitation significantly decreases to 68 mm (2.7 in) spread over 21 days, and humidity drops to 80%. For more specific details about the weather in Thimphu during November, you can visit Thimphu weather in November.

September and December present strikingly different weather patterns. In September, temperatures range from a mild 8°C (46°F) at night to a pleasant 23°C (74°F) during the day, with an average of 15°C (59°F). Additionally, the month is characterized by high humidity at 93% and significant precipitation, totaling 316 mm (12.4 in) over 28 days. In contrast, December experiences much cooler temperatures, with a minimum of -9°C (15°F) and a maximum of 16°C (62°F), averaging just 3°C (38°F). The month also sees significantly less precipitation, totaling 68 mm (2.7 in) over 19 days, and lower humidity at 75%. For more detailed information on December weather, you can check Thimphu weather in December.

Compare Thimphu's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Thimphu

As September arrives in Thimphu, the weather transitions into a unique blend of mild warmth and frequent rain. Unlike the hotter summer months, September offers a refreshing average temperature that invites exploration, yet the high humidity and considerable precipitation can dampen outdoor plans. With rain gracing nearly every day, it’s a month characterized by lush landscapes and vibrant greenery, setting it apart from the drier spell of the preceding summer. Despite the wet conditions, the allure of Thimphu remains, enhancing the city’s charm amidst the clouds. For more insights on what to expect throughout the year, visit Thimphu Climate.