September weather forecastPullman, WA
September
Weather in September
September receives the first hints of fall in Pullman, curbing the summer extremes. It subtly introduces a comfortable temperature range, a pleasant drift from the summer heat. Rainfall shows a positive trend, though snowfall remains non-existent. While daylight hours start to decrease, Pullman makes the most of the lingering summer sunshine. Substantially, September in Pullman even records 0.31" (8mm) of snowfall, an anomaly in the yearly cycle.Temperature
With the onset of September, Pullman's average high-temperature adjusts, receding from August's warm 83.7°F (28.7°C) to a still moderately hot 73.4°F (23°C). Pullman's nighttime temperature in September demonstrates a noticeable plunge to a fresh 51.8°F (11°C).Humidity
In September, the average relative humidity in Pullman is 47%.Rainfall
In September, in Pullman, the rain falls for 7.3 days. Throughout September, 0.59" (15mm) of precipitation is accumulated. In Pullman, Washington, during the entire year, the rain falls for 131 days and collects up to 18.15" (461mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Pullman. September is the first month it typically snows in Pullman. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. In Pullman, during the entire year, snow falls for 53.7 days and aggregates up to 37.44" (951mm) of snow.Daylight
The average length of the day in September in Pullman is 12h and 32min.On the first day of the month, sunrise is at 6:09 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:29 pm PDT.
Sunshine
In September, the average sunshine is 10.3h.UV index
In Pullman, Washington, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Pullman, WA
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is August (83.7°F).
The month with the lowest average high temperature is December (34.3°F).
- Average low temperature in September: 51.8°F
The month with the highest average low temperature is August (58.6°F).
The coldest month (with the lowest average low temperature) is December (24.1°F).
Average pressure in September
Pullman, 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
Pullman, WA
- Average wind speed in September: 5.1mph
The windiest months (with the highest average wind speed) are March and April (6.7mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Pullman, WA
- Average humidity in September: 47%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Pullman, WA
- Average rainfall in September: 0.59"
The wettest month (with the highest rainfall) is January (2.2").
The driest months (with the least rainfall) are July and August (0.47").
Average rainfall days in September
Pullman, WA
- Average rainfall days in September: 7.3 days
The month with the highest number of rainy days is March (15.4 days).
The months with the least rainy days are July and August (5.8 days).
Average snowfall in September
Pullman, WA
- Average snowfall in September: 0.31"
The month with the highest snowfall is February (10.04").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Pullman, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (12.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Pullman, WA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 10h and 18min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 4h and 42min).
Average sunshine days in September
Pullman, WA
- Average sunshine days in September: 20.5 days
The month with the most sunshine days is July (23.4 days).
The month with the least sunshine days is February (10.2 days).
Average UV index in September
Pullman, 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, March, November and December (UV index 2).
Average cloud cover in September
Pullman, WA
- Average cloud cover in September: 19
The months with the most cloud cover are January and February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Pullman, 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).
