September weather forecastAlla, Bhutan
September
Weather in September
September signals the onset of autumn in Alla, Bhutan. The most notable weather change is the drop in average temperature to 16.2°C (61.2°F), thus indicating a shift from summer to cooler months. The rainfall dips to 119mm (4.69"), indicating a decrease in precipitation, while the humidity levels remain high. Towards the end of the month, the daylight hours begin to shorten more distinctly, while the UV index dips to 4. Despite these changes, the wind gusts maintain a steady pace, ensuring a refreshing breeze through the day.Temperature
Alla observes an average high-temperature of a still enjoyable 16.2°C (61.2°F) in September, barely different from 17.8°C (64°F) in August. During the September nights, an average temperature of 10.1°C (50.2°F) is observed.Humidity
In September, the average relative humidity is 80%.Rainfall
In Alla, during September, the rain falls for 21.3 days and regularly aggregates up to 119mm (4.69") of precipitation. Throughout the year, there are 187.5 rainfall days, and 879mm (34.61") of precipitation is accumulated.Snowfall
In Alla, snow does not fall in June through October.Daylight
In September, the average length of the day is 12h and 19min.On the first day of the month, sunrise is at 05:39 and sunset at 18:20. On the last day of September, sunrise is at 05:52 and sunset at 17:47 +06.
Sunshine
The average sunshine in September in Alla is 9.6h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: An average UV index of 4 in September transforms into this advice:
Take necessary precautions - Protection from skin and eye injury is mandatory. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Alla, Bhutan
- Average high temperature in September: 16.2°C
The warmest month (with the highest average high temperature) is August (17.8°C).
The month with the lowest average high temperature is January (5.8°C).
- Average low temperature in September: 10.1°C
The month with the highest average low temperature is August (11.9°C).
The coldest month (with the lowest average low temperature) is January (-2.6°C).
Average pressure in September
Alla, Bhutan
- Average pressure in September: 1011.5mbar
The month with the highest atmospheric pressure is January (1016.9mbar).
The month with the lowest atmospheric pressure is July (1006.8mbar).
Average wind speed in September
Alla, Bhutan
- Average wind speed in September: 6.4km/h
The windiest month (with the highest average wind speed) is April (8.6km/h).
The calmest months (with the lowest average wind speed) are September and October (6.4km/h).
Average humidity in September
Alla, Bhutan
- Average humidity in September: 80%
The month with the highest relative humidity is July (83%).
The months with the lowest relative humidity are January and February (57%).
Average rainfall in September
Alla, Bhutan
- Average rainfall in September: 119mm
The wettest month (with the highest rainfall) is July (196mm).
The driest month (with the least rainfall) is December (7mm).
Average rainfall days in September
Alla, Bhutan
- Average rainfall days in September: 21.3 days
The month with the highest number of rainy days is July (27.3 days).
The month with the least rainy days is January (4.2 days).
Average snowfall in September
Alla, Bhutan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (146mm).
The months with the least snowfall are June, July, August, September and October (0mm).
Average snowfall days in September
Alla, Bhutan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (8.2 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Alla, Bhutan
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is April (Average sunshine: 11h and 12min).
The months with the least sunshine are January, February and November (Average sunshine: 7h and 24min).
Average sunshine days in September
Alla, Bhutan
- Average sunshine days in September: 6.1 days
The month with the most sunshine days is January (22.9 days).
The months with the least sunshine days are May and June (2.8 days).
Average UV index in September
Alla, Bhutan
- Average UV index in September: 4
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Alla, Bhutan
- Average cloud cover in September: 39
The month with the most cloud cover is July (Cloud cover 51).
The month with the least cloud cover is January (Cloud cover 14).
Average visibility in September
Alla, Bhutan
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, October, November and December (10km).
The months with the lowest visibility are June, July, August and September (9km).
