Oak Harbor Weather in September
Average highs run from 69°F on September 1 to 64°F on September 30, and lows from 52°F to 48°F. Normal precipitation for the month is 1.08 in over about 10 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 67°F
- Average low
- 50°F
- Precipitation
- 1.08 in
- Record high
- 91°FSep 15, 1967
- Record low
- 29°FSep 24, 1926
- Chance of a freeze
- 0%
- Daylight
- 13 h 24 min to 11 h 42 min
- Cloud cover
- 53%
- Humidity
- 79%
- Dew point
- 52°F
- Wind
- 3.6 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Sep 1 | 69°F | 52°F | 83°F 1969 | 37°F 1973 | 26% | 0% |
| Sep 2 | 69°F | 52°F | 90°F 1974 | 38°F 1960 | 26% | 0% |
| Sep 3 | 69°F | 52°F | 84°F 2003 | 39°F 1929 | 26% | 0% |
| Sep 4 | 69°F | 52°F | 83°F 1962 | 39°F 1956 | 27% | 0% |
| Sep 5 | 69°F | 52°F | 83°F 1955 | 38°F 1969 | 27% | 0% |
| Sep 6 | 68°F | 52°F | 86°F 1986 | 37°F 1969 | 28% | 0% |
| Sep 7 | 68°F | 51°F | 88°F 1898 | 39°F 1929 | 28% | 0% |
| Sep 8 | 68°F | 51°F | 84°F 1898 | 36°F 1936 | 29% | 0% |
| Sep 9 | 68°F | 51°F | 86°F 1907 | 37°F 1962 | 29% | 0% |
| Sep 10 | 68°F | 51°F | 83°F 1944 | 39°F 1961 | 29% | 0% |
| Sep 11 | 68°F | 51°F | 82°F 1957 | 37°F 1949 | 30% | 0% |
| Sep 12 | 68°F | 51°F | 81°F 1961 | 36°F 1949 | 30% | 0% |
| Sep 13 | 67°F | 51°F | 87°F 1961 | 35°F 1970 | 31% | 0% |
| Sep 14 | 67°F | 50°F | 83°F 1937 | 38°F 1896 | 31% | 0% |
| Sep 15 | 67°F | 50°F | 91°F 1967 | 36°F 1936 | 32% | 0% |
| Sep 16 | 67°F | 50°F | 89°F 1967 | 36°F 1936 | 32% | 0% |
| Sep 17 | 67°F | 50°F | 78°F 1984 | 34°F 1965 | 32% | 0% |
| Sep 18 | 67°F | 50°F | 79°F 1962 | 35°F 1963 | 33% | 0% |
| Sep 19 | 66°F | 50°F | 81°F 1901 | 36°F 1947 | 33% | 0% |
| Sep 20 | 66°F | 50°F | 85°F 1976 | 35°F 1983 | 33% | 0% |
| Sep 21 | 66°F | 49°F | 80°F 1974 | 35°F 1932 | 34% | 0% |
| Sep 22 | 66°F | 49°F | 80°F 1990 | 34°F 1955 | 34% | 0% |
| Sep 23 | 66°F | 49°F | 83°F 1957 | 33°F 1926 | 34% | 0% |
| Sep 24 | 65°F | 49°F | 81°F 1974 | 29°F 1926 | 35% | 0% |
| Sep 25 | 65°F | 49°F | 78°F 1974 | 30°F 1926 | 35% | 0% |
| Sep 26 | 65°F | 49°F | 75°F 2006 | 34°F 1926 | 36% | 0% |
| Sep 27 | 65°F | 49°F | 81°F 1967 | 29°F 1972 | 36% | 0% |
| Sep 28 | 65°F | 48°F | 81°F 2003 | 34°F 1929 | 36% | 0% |
| Sep 29 | 64°F | 48°F | 77°F 1935 | 33°F 1961 | 37% | 0% |
| Sep 30 | 64°F | 48°F | 76°F 1957 | 36°F 1929 | 37% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:28 AM, sunset 7:52 PM
- September 30
- sunrise 7:09 AM, sunset 6:51 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024255 (Whidbey Island Nas), public domain. Records: NOAA GHCN-Daily, station USC00451783, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.