September weather forecastAsotin, WA
September
Weather in September
September, the first month of the autumn in Asotin, is still a warm month, with an average temperature ranging between min 52.5°F (11.4°C) and max 75.2°F (24°C).Temperature
September brings a minor decrease, with the average high-temperature reducing from a moderately hot 85.1°F (29.5°C) in August to a still warm 75.2°F (24°C). Asotin anticipates a considerable daily temperature fluctuation in September, with low temperatures averaging a cool 52.5°F (11.4°C).Humidity
The average relative humidity in September is 46%.Rainfall
In Asotin, during September, the rain falls for 5.3 days and regularly aggregates up to 0.35" (9mm) of precipitation. In Asotin, Washington, during the entire year, the rain falls for 112.5 days and collects up to 9.09" (231mm) of precipitation.Snowfall
In Asotin, snow does not fall in June through September.Daylight
The average length of the day in September in Asotin is 12h and 32min.On the first day of September, sunrise is at 6:09 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:29 pm PDT.
Sunshine
In September, the average sunshine is 10.4h.UV index
In Asotin, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average maximum UV index of 4 in September leads to these recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Asotin, WA
- Average high temperature in September: 75.2°F
The warmest month (with the highest average high temperature) is August (85.1°F).
The month with the lowest average high temperature is December (35.8°F).
- Average low temperature in September: 52.5°F
The month with the highest average low temperature is August (59.2°F).
The coldest month (with the lowest average low temperature) is December (24.3°F).
Average pressure in September
Asotin, WA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in September
Asotin, WA
- Average wind speed in September: 4.2mph
The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest months (with the lowest average wind speed) are August and September (4.2mph).
Average humidity in September
Asotin, WA
- Average humidity in September: 46%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Asotin, WA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is May (1.3").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in September
Asotin, WA
- Average rainfall days in September: 5.3 days
The month with the highest number of rainy days is April (13.8 days).
The month with the least rainy days is August (4.7 days).
Average snowfall in September
Asotin, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Asotin, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Asotin, WA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 24min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).
Average sunshine days in September
Asotin, WA
- Average sunshine days in September: 23.5 days
The months with the most sunshine days are July and September (23.5 days).
The months with the least sunshine days are February and April (13.8 days).
Average UV index in September
Asotin, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Asotin, WA
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Asotin, WA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
