Keweenaw County Weather in September
Average highs run from 70°F on September 1 to 59°F on September 30, and lows from 55°F to 47°F. Normal precipitation for the month is 3.06 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
- 65°F
- Average low
- 51°F
- Precipitation
- 3.06 in
- Record high
- 91°FSep 3, 1971
- Record low
- 24°FSep 28, 2000
- Chance of a freeze
- 6%
- Daylight
- 13 h 21 min to 11 h 43 min
- Cloud cover
- 77%
- Humidity
- 81%
- Dew point
- 51°F
- Wind
- 13.9 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 70°F | 55°F | 88°F 2008 | 38°F 2001 | 33% |
| Sep 2 | 70°F | 55°F | 90°F 1971 | 33°F 1976 | 33% |
| Sep 3 | 70°F | 55°F | 91°F 1971 | 39°F 1974 | 34% |
| Sep 4 | 70°F | 55°F | 90°F 2023 | 35°F 1950 | 34% |
| Sep 5 | 69°F | 55°F | 90°F 2023 | 35°F 1950 | 34% |
| Sep 6 | 69°F | 54°F | 87°F 2007 | 31°F 1952 | 35% |
| Sep 7 | 69°F | 54°F | 90°F 2002 | 31°F 1951 | 35% |
| Sep 8 | 68°F | 54°F | 89°F 2002 | 35°F 1949 | 35% |
| Sep 9 | 68°F | 54°F | 85°F 2011 | 35°F 1975 | 35% |
| Sep 10 | 68°F | 53°F | 87°F 1952 | 32°F 2006 | 36% |
| Sep 11 | 67°F | 53°F | 90°F 2005 | 34°F 1965 | 36% |
| Sep 12 | 67°F | 53°F | 87°F 1976 | 31°F 2014 | 36% |
| Sep 13 | 67°F | 52°F | 87°F 1952 | 31°F 1953 | 36% |
| Sep 14 | 66°F | 52°F | 83°F 2015 | 30°F 1953 | 37% |
| Sep 15 | 66°F | 52°F | 87°F 2015 | 30°F 1964 | 37% |
| Sep 16 | 65°F | 51°F | 89°F 1948 | 30°F 2011 | 37% |
| Sep 17 | 65°F | 51°F | 84°F 2024 | 31°F 1950 | 37% |
| Sep 18 | 65°F | 51°F | 84°F 2000 | 29°F 2020 | 38% |
| Sep 19 | 64°F | 51°F | 87°F 2021 | 33°F 1993 | 38% |
| Sep 20 | 64°F | 50°F | 83°F 1970 | 33°F 2010 | 39% |
| Sep 21 | 63°F | 50°F | 82°F 2023 | 31°F 1948 | 39% |
| Sep 22 | 63°F | 50°F | 80°F 2023 | 30°F 1948 | 39% |
| Sep 23 | 62°F | 49°F | 88°F 2017 | 26°F 1950 | 40% |
| Sep 24 | 62°F | 49°F | 89°F 2017 | 26°F 1950 | 40% |
| Sep 25 | 62°F | 49°F | 77°F 2025 | 30°F 2012 | 41% |
| Sep 26 | 61°F | 48°F | 82°F 2008 | 27°F 1965 | 41% |
| Sep 27 | 61°F | 48°F | 83°F 1952 | 25°F 2000 | 42% |
| Sep 28 | 60°F | 47°F | 80°F 2014 | 24°F 2000 | 42% |
| Sep 29 | 60°F | 47°F | 80°F 2025 | 26°F 1949 | 43% |
| Sep 30 | 59°F | 47°F | 79°F 2024 | 25°F 1964 | 43% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:12 AM, sunset 8:33 PM
- September 30
- sunrise 7:51 AM, sunset 7:34 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094899 (Copper Harbor), public domain. Records: NOAA GHCN-Daily, station USW00014858, 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.