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
With the onset of September, Walnut Grove's average high-temperature slightly adjusts, moderately receding from August's warm 80.6°F (27°C) to an agreeable 73°F (22.8°C). Walnut Grove anticipates a considerable cooling off from the daytime high to an average minimum temperature of 50.7°F (10.4°C) in September.Humidity
In September, the average relative humidity in Walnut Grove is 70%.Rainfall
In Walnut Grove, Washington, in September, it is raining for 10.8 days, with typically 1.73" (44mm) of accumulated precipitation. In Walnut Grove, during the entire year, the rain falls for 177.1 days and collects up to 34.29" (871mm) of precipitation.Snowfall
In Walnut Grove, snow does not fall in April through October.Daylight
The average length of the day in September in Walnut Grove is 12h and 31min.On the first day of September, sunrise is at 6:32 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:51 pm PDT.
Sunshine
In September, the average sunshine in Walnut Grove is 9.3h.UV index
In September, the average daily maximum UV index in Walnut Grove is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: An average UV index of 4 in September transforms into this advice:
Guard yourself - Avoiding sunburn is suggested. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Frequently asked questions
What is the average September temperature in Walnut Grove?
What is the average humidity in September in Walnut Grove?
How much does it rain in Walnut Grove in September?
When it does not snow in Walnut Grove?
How many hours of daylight does Walnut Grove have in September?
When are sunrise and sunset in September in Walnut Grove?
How long on average sun shines in September in Walnut Grove?
How high is the UV index in September in Walnut Grove?
Average temperature in September
Walnut Grove, WA
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is August (80.6°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in September: 50.7°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34°F).
Average pressure in September
Walnut Grove, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in September
Walnut Grove, WA
- Average wind speed in September: 3.9mph
The windiest month (with the highest average wind speed) is January (5.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in September
Walnut Grove, WA
- Average humidity in September: 70%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is August (65%).
Average rainfall in September
Walnut Grove, WA
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is December (5.08").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
Walnut Grove, WA
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is March (20.6 days).
The month with the least rainy days is August (4.9 days).
Average snowfall in September
Walnut Grove, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.42").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Walnut Grove, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Walnut Grove, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The months with the least sunshine are January and February (Average sunshine: 4h and 6min).
Average sunshine days in September
Walnut Grove, WA
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is February (7.9 days).
Average UV index in September
Walnut Grove, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Walnut Grove, WA
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Walnut Grove, WA
- Average visibility in September: 6mi
The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).
Walnut Grove, Washington, USA
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