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, Brinnon experiences a modest temperature adjustment, with the average high-temperature gently receding from a warm 75.7°F (24.3°C) in August to an agreeable 68.9°F (20.5°C). The average nighttime temperature lowers to a cool 50.9°F (10.5°C) throughout September.Humidity
The average relative humidity in September is 76%.Rainfall
In Brinnon, in September, during 12.7 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. In Brinnon, during the entire year, the rain falls for 180.4 days and collects up to 26.93" (684mm) of precipitation.Snowfall
May through October are months without snowfall in Brinnon.Daylight
In September, the average length of the day is 12h and 33min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:10 am and sunset at 6:52 pm PDT.
Sunshine
In Brinnon, the average sunshine in September is 9.5h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum UV index of 4 during September leads to these instructions:
Exercise prevention - Warding off sunburn is urged. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
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?
How many hours of daylight does Brinnon have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Brinnon have in September?
How high is the UV index in September?
Average temperature in September
Brinnon, WA
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is August (75.7°F).
The month with the lowest average high temperature is December (42.8°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (35.2°F).
Average pressure in September
Brinnon, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March and September (30.01"Hg).
Average wind speed in September
Brinnon, WA
- Average wind speed in September: 3.8mph
The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.2mph).
Average humidity in September
Brinnon, WA
- Average humidity in September: 76%
The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Brinnon, WA
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is January (4.33").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Brinnon, WA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is March (20.1 days).
The month with the least rainy days is August (6.1 days).
Average snowfall in September
Brinnon, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.4").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Brinnon, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.1 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
Brinnon, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 4h and 36min).
Average sunshine days in September
Brinnon, WA
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is August (21.8 days).
The month with the least sunshine days is February (8.7 days).
Average UV index in September
Brinnon, WA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Brinnon, WA
- Average cloud cover in September: 31
The months with the most cloud cover are January and December (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Brinnon, WA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, November and December (5mi).
Brinnon, Washington, USA
Weather forecast for your location
2. Allow the app to use your location