September weather forecastChimacum, WA
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Chimacum, Washington, with an average temperature ranging between max 63.1°F (17.3°C) and min 52.7°F (11.5°C).Temperature
The unfolding of September shows an average high-temperature of a still comfortable 63.1°F (17.3°C), indicating a slight variance from August's 67.8°F (19.9°C). The nights of September anticipate an average low-temperature of 52.7°F (11.5°C).Humidity
The average relative humidity in September in Chimacum is 79%.Rainfall
In Chimacum, Washington, during September, the rain falls for 12.5 days and regularly aggregates up to 1.5" (38mm) of precipitation. In Chimacum, during the entire year, the rain falls for 180.3 days and collects up to 21.85" (555mm) of precipitation.Snowfall
In Chimacum, snow does not fall in May through October.Daylight
In September, the average length of the day in Chimacum is 12h and 33min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:10 am and sunset at 6:51 pm PDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Prioritize safety - Suggestions to prevent sun damage are offered. Around midday, solar radiation is most harmful; hence, exposure should be limited. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chimacum, WA
- Average high temperature in September: 63.1°F
The warmest month (with the highest average high temperature) is August (67.8°F).
The month with the lowest average high temperature is December (43°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is August (55.4°F).
The coldest month (with the lowest average low temperature) is February (37.4°F).
Average pressure in September
Chimacum, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are March and September (30.01"Hg).
Average wind speed in September
Chimacum, WA
- Average wind speed in September: 4.3mph
The windiest month (with the highest average wind speed) is November (7.4mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Chimacum, WA
- Average humidity in September: 79%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (75%).
Average rainfall in September
Chimacum, WA
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is November (2.91").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in September
Chimacum, WA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is March (20.7 days).
The month with the least rainy days is August (6.6 days).
Average snowfall in September
Chimacum, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Chimacum, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 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
Chimacum, WA
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 9h and 30min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Chimacum, WA
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is August (22.3 days).
The month with the least sunshine days is March (8.2 days).
Average UV index in September
Chimacum, WA
- Average UV index in September: 4
The month with the highest UV index is 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
Chimacum, WA
- Average cloud cover in September: 30
The months with the most cloud cover are January, February and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility in September
Chimacum, 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).
