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
As August transitions into September, the average high-temperature rests at a still comfortable 62.8°F (17.1°C), maintaining a close resemblance to the previous month. Throughout September, Oak Harbor encounters an average temperature drop to a fresh 53.4°F (11.9°C).Humidity
In September, the average relative humidity is 79%.Rainfall
In Oak Harbor, Washington, 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 Oak Harbor.Ocean temperature
August and September, with an average ocean temperature of 53.1°F (11.7°C), are months with the warmest seawater in Oak Harbor.Note: You can swim in 53.1°F (11.7°C) below 50°F (10°C) with proper thermal wear; failing that, the cold shock and respiratory challenges are nearly certain. A short span at 55.4°F (13°C) without it is tough.
Daylight
The average length of the day in September is 12h and 34min.On the first day of September, sunrise is at 6:29 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:50 pm PDT.
Sunshine
The average sunshine in September in Oak Harbor, Washington, is 9.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 4 during September translates into the following guidance:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Oak Harbor?
What is the average humidity in September in Oak Harbor?
How many days does it rain in September in Oak Harbor?
When it does not snow in Oak Harbor?
When is the ocean warmest in Oak Harbor?
What is the ocean temperature in September in Oak Harbor?
What is the average length of the day in September in Oak Harbor?
When are sunrise and sunset in September in Oak Harbor?
How many hours of sunshine does Oak Harbor have in September?
How high is the UV index in September in Oak Harbor?
Average temperature in September
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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
Oak Harbor, 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).
Oak Harbor, Washington, USA
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