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
West Richland experiences a temperature shift at the start of September, with average high-temperatures adjusting from a tropical 89.4°F (31.9°C) in August to a warm 78.6°F (25.9°C). Throughout September, the average low-temperature records at a refreshing 57°F (13.9°C).Humidity
In September, the average relative humidity in West Richland is 43%.Rainfall
The months with the least rainfall are July and September Rain falls for 4 days and accumulates 0.2" (5mm) of rain.Snowfall
April through October are months without snowfall in West Richland.Daylight
The average length of the day in September in West Richland, Washington, is 12h and 32min.On the first day of September, sunrise is at 6:18 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:38 pm PDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
The average daily maximum UV index in September in West Richland is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 5 during September translates into the following recommendations:
Take necessary precautions - Defending against sun damage is advocated. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Frequently asked questions
What are the temperatures in West Richland in September?
What is the average humidity in September in West Richland?
What is the driest month in West Richland?
How many days does it rain in September in West Richland?
When it does not snow in West Richland?
How many hours of daylight does West Richland have in September?
When is the sunrise / sunset in September in West Richland?
How many hours of sunshine does West Richland have in September?
How high is the UV index in September in West Richland?
Average temperature in September
West Richland, WA
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (38.1°F).
- Average low temperature in September: 57°F
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is December (27.5°F).
Average pressure in September
West Richland, WA
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in September
West Richland, WA
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is December (5.6mph).
Average humidity in September
West Richland, WA
- Average humidity in September: 43%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is July (35%).
Average rainfall in September
West Richland, WA
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is December (0.94").
The driest months (with the least rainfall) are July and September (0.2").
Average rainfall days in September
West Richland, WA
- Average rainfall days in September: 4 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is July (3.5 days).
Average snowfall in September
West Richland, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
West Richland, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (3.3 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
West Richland, 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 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
West Richland, WA
- Average sunshine days in September: 24.2 days
The month with the most sunshine days is July (25.7 days).
The months with the least sunshine days are February and March (15.3 days).
Average UV index in September
West Richland, WA
- Average UV index in September: 5
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
West Richland, WA
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in September
West Richland, 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).
West Richland, Washington, USA
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