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
The arrival of September corresponds with a temperature reduction, down from August's moderately hot 84.6°F (29.2°C) to a still warm 74.3°F (23.5°C). During the month of September, the nighttime temperature falls to an average of 53.6°F (12°C).Humidity
In Walla, the average relative humidity in September is 47%.Rainfall
In Walla, in September, it is raining for 7.6 days, with typically 0.55" (14mm) of accumulated precipitation. In Walla, Washington, during the entire year, the rain falls for 141.7 days and collects up to 15.12" (384mm) of precipitation.Snowfall
Months with snowfall in Walla, Washington, are January through April, September, November and December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, in Walla, Washington, there are 21.1 snowfall days, and 9.09" (231mm) of snow is accumulated.Daylight
In Walla, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:34 pm PDT.
Sunshine
In September, the average sunshine is 10.5h.UV index
The average daily maximum UV index in September in Walla is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 4 suggests this advice:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Walla in September?
What is the average humidity in September in Walla?
How much does it rain in Walla in September?
When does it start snowing in Walla?
How many hours of daylight does Walla have in September?
When are sunrise and sunset in September in Walla?
How many hours of sunshine does Walla have in September?
What is the UV index intensity in September in Walla?
Average temperature in September
Walla Walla, WA
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (37.4°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is August (60.8°F).
The coldest month (with the lowest average low temperature) is December (27°F).
Average pressure in September
Walla Walla, WA
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed in September
Walla Walla, WA
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest month (with the lowest average wind speed) is September (5.9mph).
Average humidity in September
Walla Walla, WA
- Average humidity in September: 47%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Walla Walla, WA
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
Walla Walla, WA
- Average rainfall days in September: 7.6 days
The month with the highest number of rainy days is March (17.4 days).
The month with the least rainy days is July (4.9 days).
Average snowfall in September
Walla Walla, WA
- Average snowfall in September: 0.08"
The month with the highest snowfall is February (2.91").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in September
Walla Walla, WA
- Average snowfall days in September: 0.1 days
The months with the highest number of snowfall days are February and December (6.1 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Walla Walla, WA
- Average daylight in September: 12h and 3min
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 3min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).
Average sunshine days in September
Walla Walla, WA
- Average sunshine days in September: 20.1 days
The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is February (10 days).
Average UV index in September
Walla Walla, 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
Walla Walla, WA
- Average cloud cover in September: 17
The months with the most cloud cover are January, February and December (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in September
Walla Walla, WA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Walla Walla, Washington, USA
Weather forecast for your location
2. Allow the app to use your location