September weather forecastSuquamish, WA
September
Weather in September
September, the first month of the autumn in Suquamish, is still a pleasant month, with an average temperature ranging between max 68.2°F (20.1°C) and min 52.3°F (11.3°C).Temperature
The move into September indicates a slight reduction in the average high-temperature, down from August's moderately hot 73.8°F (23.2°C) to an agreeable 68.2°F (20.1°C). Throughout September, the temperature tends to fall to a consistent average low of 52.3°F (11.3°C).Humidity
In September, the average relative humidity is 76%.Rainfall
In Suquamish, in September, during 12.5 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In Suquamish, during the entire year, the rain falls for 169.8 days and collects up to 22.44" (570mm) of precipitation.Snowfall
In Suquamish, snow does not fall in May through October.Ocean temperature
The months with the warmest seawater are August and September, with an average ocean temperature of 53.2°F (11.8°C).Note: Dipping in 53.2°F (11.8°C) at temperatures less than 50°F (10°C) without proper gear can lead to pronounced cold shock and breathing difficulties.
Daylight
The average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:09 am and sunset at 6:50 pm PDT.
Sunshine
In Suquamish, the average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: In September, the UV index of 4 transforms into the following advice:
Undertake precautions - It is suggested to shield oneself from sunburn. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Suquamish, WA
- Average high temperature in September: 68.2°F
The warmest month (with the highest average high temperature) is August (73.8°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in September: 52.3°F
The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (36.5°F).
Average pressure in September
Suquamish, 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, August and September (30.01"Hg).
Average wind speed in September
Suquamish, WA
- Average wind speed in September: 4.3mph
The windiest months (with the highest average wind speed) are March and November (6.2mph).
The calmest months (with the lowest average wind speed) are July and August (3.7mph).
Average humidity in September
Suquamish, WA
- Average humidity in September: 76%
The months with the highest relative humidity are January, February, November and December (84%).
The months with the lowest relative humidity are July and August (72%).
Average rainfall in September
Suquamish, WA
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is January (3.43").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
Suquamish, WA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is March (19.3 days).
The month with the least rainy days is August (6.2 days).
Average snowfall in September
Suquamish, 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
Suquamish, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Suquamish, WA
- Average sea temperature in September: 53.1°F
The best month for swimming (with the highest average sea temperature) is August (53.2°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).
Average daylight in September /
Average sunshine in September
Suquamish, WA
- Average daylight in September: 12h and 30min
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 24min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
Suquamish, WA
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is August (23 days).
The month with the least sunshine days is November (9.4 days).
Average UV index in September
Suquamish, 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
Suquamish, WA
- Average cloud cover in September: 32
The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Suquamish, 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).
