Sequim Weather in September
Average highs run from 69°F on September 1 to 62°F on September 30, and lows from 49°F to 43°F. Normal precipitation for the month is 0.87 in over about 9 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
- 66°F
- Average low
- 46°F
- Precipitation
- 0.87 in
- Record high
- 89°FSep 12, 2007
- Record low
- 35°FSep 19, 1947
- Chance of a freeze
- 5%
- Daylight
- 13 h 22 min to 11 h 42 min
- Cloud cover
- 53%
- Humidity
- 75%
- Dew point
- 48°F
- Wind
- 3.8 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 | 49°F | 81°F 1988 | 40°F 1892 | 22% | 0% |
| Sep 2 | 69°F | 49°F | 85°F 1988 | 40°F 1975 | 23% | 0% |
| Sep 3 | 69°F | 49°F | 85°F 1974 | 42°F 1892 | 23% | 0% |
| Sep 4 | 68°F | 49°F | 83°F 1955 | 41°F 1999 | 23% | 0% |
| Sep 5 | 68°F | 48°F | 84°F 1955 | 38°F 1947 | 24% | 0% |
| Sep 6 | 68°F | 48°F | 85°F 1973 | 43°F 1947 | 24% | 0% |
| Sep 7 | 68°F | 48°F | 85°F 1981 | 43°F 1965 | 25% | 0% |
| Sep 8 | 68°F | 48°F | 80°F 1907 | 43°F 1928 | 25% | 0% |
| Sep 9 | 68°F | 48°F | 82°F 1907 | 41°F 1928 | 26% | 0% |
| Sep 10 | 67°F | 47°F | 80°F 1963 | 39°F 1952 | 26% | 0% |
| Sep 11 | 67°F | 47°F | 85°F 2007 | 41°F 1949 | 26% | 0% |
| Sep 12 | 67°F | 47°F | 89°F 2007 | 36°F 1949 | 27% | 0% |
| Sep 13 | 67°F | 47°F | 84°F 1957 | 41°F 1952 | 27% | 0% |
| Sep 14 | 67°F | 47°F | 85°F 1951 | 41°F 1947 | 28% | 0% |
| Sep 15 | 66°F | 46°F | 89°F 1967 | 42°F 1901 | 28% | 0% |
| Sep 16 | 66°F | 46°F | 89°F 2009 | 42°F 1951 | 29% | 0% |
| Sep 17 | 66°F | 46°F | 82°F 2009 | 41°F 1908 | 29% | 0% |
| Sep 18 | 66°F | 46°F | 79°F 1897 | 40°F 1947 | 30% | 0% |
| Sep 19 | 65°F | 46°F | 78°F 1927 | 35°F 1947 | 30% | 0% |
| Sep 20 | 65°F | 45°F | 78°F 1952 | 38°F 1949 | 31% | 0% |
| Sep 21 | 65°F | 45°F | 85°F 1974 | 40°F 1955 | 31% | 0% |
| Sep 22 | 65°F | 45°F | 82°F 1974 | 39°F 1955 | 31% | 0% |
| Sep 23 | 64°F | 45°F | 82°F 1974 | 40°F 1926 | 32% | 0% |
| Sep 24 | 64°F | 45°F | 79°F 1947 | 35°F 1926 | 32% | 0% |
| Sep 25 | 64°F | 44°F | 81°F 1974 | 35°F 1908 | 32% | 0% |
| Sep 26 | 63°F | 44°F | 77°F 1947 | 38°F 1908 | 33% | 0% |
| Sep 27 | 63°F | 44°F | 77°F 1967 | 38°F 1972 | 33% | 0% |
| Sep 28 | 63°F | 44°F | 80°F 1918 | 39°F 1948 | 34% | 0% |
| Sep 29 | 63°F | 43°F | 80°F 2003 | 38°F 1919 | 34% | 0% |
| Sep 30 | 62°F | 43°F | 75°F 1987 | 40°F 1903 | 34% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:31 AM, sunset 7:53 PM
- September 30
- sunrise 7:11 AM, sunset 6:53 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00457544 (Sequim 2 E), public domain. Records: NOAA GHCN-Daily, station USC00456678, 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.