Ontonagon County Weather in September
Average highs run from 76°F on September 1 to 64°F on September 30, and lows from 52°F to 43°F. Normal precipitation for the month is 2.95 in over about 11 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
- 71°F
- Average low
- 48°F
- Precipitation
- 2.95 in
- Snowfall
- 0.1 in
- Record high
- 99°FSep 8, 1906
- Record low
- 21°FSep 28, 1907
- Chance of a freeze
- 46%
- Days of 90°F or more
- 0.5
- Daylight
- 13 h 19 min to 11 h 44 min
- Cloud cover
- 73%
- Humidity
- 79%
- Dew point
- 51°F
- Wind
- 9.6 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 | 76°F | 52°F | 92°F 1913 | 32°F 1909 | 30% | 0% |
| Sep 2 | 76°F | 52°F | 92°F 1929 | 29°F 1976 | 31% | 0% |
| Sep 3 | 76°F | 52°F | 93°F 1929 | 31°F 1974 | 31% | 0% |
| Sep 4 | 75°F | 52°F | 92°F 1929 | 32°F 1974 | 31% | 0% |
| Sep 5 | 75°F | 52°F | 93°F 2023 | 32°F 1976 | 32% | 0% |
| Sep 6 | 75°F | 51°F | 90°F 1960 | 34°F 1907 | 32% | 0% |
| Sep 7 | 74°F | 51°F | 90°F 1978 | 32°F 1986 | 32% | 0% |
| Sep 8 | 74°F | 51°F | 99°F 1906 | 30°F 1956 | 33% | 0% |
| Sep 9 | 73°F | 51°F | 93°F 1931 | 29°F 1975 | 33% | 0% |
| Sep 10 | 73°F | 50°F | 96°F 1931 | 32°F 1918 | 34% | 0% |
| Sep 11 | 73°F | 50°F | 92°F 1931 | 31°F 1941 | 34% | 0% |
| Sep 12 | 72°F | 50°F | 90°F 1931 | 32°F 1946 | 35% | 0% |
| Sep 13 | 72°F | 50°F | 91°F 1939 | 26°F 1963 | 35% | 0% |
| Sep 14 | 71°F | 49°F | 93°F 1939 | 29°F 1975 | 35% | 0% |
| Sep 15 | 71°F | 49°F | 93°F 1939 | 24°F 1964 | 36% | 0% |
| Sep 16 | 71°F | 49°F | 88°F 1939 | 28°F 1916 | 36% | 0% |
| Sep 17 | 70°F | 48°F | 89°F 1948 | 24°F 1959 | 36% | 0% |
| Sep 18 | 70°F | 48°F | 85°F 1908 | 28°F 2020 | 37% | 0% |
| Sep 19 | 69°F | 48°F | 88°F 1908 | 27°F 1979 | 37% | 1% |
| Sep 20 | 69°F | 47°F | 87°F 1940 | 24°F 1973 | 37% | 1% |
| Sep 21 | 68°F | 47°F | 88°F 1908 | 25°F 1904 | 38% | 1% |
| Sep 22 | 68°F | 46°F | 86°F 1936 | 25°F 1976 | 38% | 1% |
| Sep 23 | 67°F | 46°F | 89°F 1937 | 24°F 1974 | 38% | 1% |
| Sep 24 | 67°F | 46°F | 86°F 1935 | 22°F 1976 | 39% | 1% |
| Sep 25 | 66°F | 45°F | 86°F 2017 | 24°F 1942 | 39% | 1% |
| Sep 26 | 66°F | 45°F | 85°F 1923 | 22°F 1980 | 40% | 1% |
| Sep 27 | 65°F | 45°F | 88°F 1923 | 22°F 1907 | 40% | 1% |
| Sep 28 | 65°F | 44°F | 84°F 1905 | 21°F 1907 | 40% | 1% |
| Sep 29 | 65°F | 44°F | 85°F 1922 | 21°F 1945 | 41% | 1% |
| Sep 30 | 64°F | 43°F | 83°F 1905 | 26°F 1918 | 41% | 1% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:17 AM, sunset 8:36 PM
- September 30
- sunrise 7:55 AM, sunset 7:39 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00206220 (Ontonagon 6 Se), public domain. Records: NOAA GHCN-Daily, station USC00204104, 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.