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 sea temperature 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 advent of September brings an average high-temperature of a still comfortable 62.8°F (17.1°C), almost identical to the preceding month. Coupeville observes an average nighttime temperature of 53.4°F (11.9°C) during September.Humidity
In Coupeville, the average relative humidity in September is 79%.Rainfall
In Coupeville, in September, during 11.9 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. Throughout the year, there are 183.8 rainfall days, and 24.45" (621mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Coupeville.Ocean temperature
The months with the warmest seawater in Coupeville are August and September, with an average ocean temperature of 53.1°F (11.7°C).Note: Diving into 53.1°F (11.7°C) when it's under 50°F (10°C) can cause immediate cold shock symptoms, marked by hyperventilation.
Daylight
In Coupeville, the average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:51 pm. On the last day of September, in Coupeville, Washington, sunrise is at 7:09 am and sunset at 6:51 pm PDT.
Sunshine
In September, the average sunshine in Coupeville is 9.5h.UV index
In Coupeville, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 4 during September translates into these guidelines:
Exercise prevention - Precautions against solar damage are endorsed. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Frequently asked questions
What is the temperature in September in Coupeville?
What is the average humidity in September in Coupeville?
How many days does it rain in September in Coupeville?
When it does not snow in Coupeville?
What are the months with the warmest ocean in Coupeville?
What is the ocean temperature in September in Coupeville?
What is the average length of the day in September in Coupeville?
When is the sunrise / sunset in September in Coupeville?
How many hours of sunshine does Coupeville have in September?
What is the UV index reading in September in Coupeville?
Average temperature in September
Coupeville, WA
- Average high temperature in September: 62.8°F
The warmest month (with the highest average high temperature) is July (66.2°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in September: 53.4°F
The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is February (37.9°F).
Average pressure in September
Coupeville, 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, August and September (30.01"Hg).
Average wind speed in September
Coupeville, WA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is November (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Coupeville, WA
- Average humidity in September: 79%
The months with the highest relative humidity are January, February and March (81%).
The month with the lowest relative humidity is July (76%).
Average rainfall in September
Coupeville, WA
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is November (3.46").
The driest month (with the least rainfall) is July (0.47").
Average rainfall days in September
Coupeville, WA
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is March (21.1 days).
The month with the least rainy days is August (7.5 days).
Average snowfall in September
Coupeville, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.27").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Coupeville, 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
Coupeville, WA
- Average sea temperature in September: 52.9°F
The best month for swimming (with the highest average sea temperature) is August (53°F).
The coldest month (with the lowest average sea temperature) is February (45°F).
Average daylight in September /
Average sunshine in September
Coupeville, WA
- Average daylight in September: 12h and 4min
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 24min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
Coupeville, WA
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is August (21.7 days).
The month with the least sunshine days is March (7.5 days).
Average UV index in September
Coupeville, 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
Coupeville, WA
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in September
Coupeville, 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).
Coupeville, Washington, USA
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