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 shift to September brings a decrease in the average high-temperature, falling from a warm 76.5°F (24.7°C) in August to a comfortable 67.5°F (19.7°C). Despite drastic daily temperature oscillations, North Bonneville cools down to an average low-temperature of 45.7°F (7.6°C) in September.Humidity
The average relative humidity in September is 72%.Rainfall
In North Bonneville, during September, the rain falls for 8.4 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, there are 158.4 rainfall days, and 30.31" (770mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In North Bonneville, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:49 pm PDT.
Sunshine
The average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: A daily maximum UV index of 3 in September translates into the following instructions:
Heed the precautions - It is counselled to guard against solar damage. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September in North Bonneville?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
North Bonneville, WA
- Average high temperature in September: 67.5°F
The warmest month (with the highest average high temperature) is August (76.5°F).
The month with the lowest average high temperature is December (37.9°F).
- Average low temperature in September: 45.7°F
The month with the highest average low temperature is August (48.7°F).
The coldest month (with the lowest average low temperature) is December (28.2°F).
Average pressure in September
North Bonneville, WA
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is August (29.98"Hg).
Average wind speed in September
North Bonneville, WA
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is January (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in September
North Bonneville, WA
- Average humidity in September: 72%
The month with the highest relative humidity is February (89%).
The months with the lowest relative humidity are July and August (67%).
Average rainfall in September
North Bonneville, WA
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is January (5.35").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in September
North Bonneville, WA
- Average rainfall days in September: 8.4 days
The month with the highest number of rainy days is March (18.9 days).
The month with the least rainy days is July (4.4 days).
Average snowfall in September
North Bonneville, WA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.62").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
North Bonneville, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
North Bonneville, 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: 8h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 12min).
Average sunshine days in September
North Bonneville, WA
- Average sunshine days in September: 20.1 days
The month with the most sunshine days is July (24.5 days).
The month with the least sunshine days is February (9.4 days).
Average UV index in September
North Bonneville, WA
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
North Bonneville, WA
- Average cloud cover in September: 39
The month with the most cloud cover is February (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 26).
Average visibility in September
North Bonneville, WA
- Average visibility in September: 5mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
North Bonneville, Washington, USA
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