Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
During the transition into September, Palouse observes a decrease in the average high-temperature, falling from 83.7°F (28.7°C) in August to a still warm 73.4°F (23°C). Palouse, amidst the high September temperatures, experiences a substantial shift to an average nighttime low of 51.8°F (11°C).Humidity
In Palouse, the average relative humidity in September is 47%.Rainfall
In Palouse, during September, the rain falls for 7.3 days and regularly aggregates up to 0.59" (15mm) of precipitation. In Palouse, 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. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. In Palouse, during the entire year, snow falls for 53.7 days and aggregates up to 37.44" (951mm) of snow.Daylight
In September, the average length of the day is 12h and 32min.On the first day of September in Palouse, Washington, sunrise is at 6:08 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:29 pm PDT.
Sunshine
The average sunshine in September is 10.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 4 during September leads to these instructions:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Frequently asked questions
What is the temperature in September in Palouse?
What is the average humidity in September in Palouse?
How much does it rain in Palouse in September?
When does it start snowing in Palouse?
What is the average length of the day in September in Palouse?
When are sunrise and sunset in September in Palouse?
How many hours of sunshine does Palouse have in September?
What is the UV index intensity in September in Palouse?
Average temperature in September
Palouse, 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
Palouse, 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
Palouse, 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
Palouse, 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
Palouse, 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
Palouse, 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
Palouse, 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
Palouse, 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
Palouse, WA
- Average daylight in September: 12h and 3min
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 2min
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
Palouse, 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
Palouse, 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
Palouse, 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
Palouse, 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).
Palouse, Washington, USA
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