St. Mary's Weather in September
Average highs run from 56°F on September 1 to 47°F on September 30, and lows from 44°F to 34°F. Normal precipitation for the month is 2.89 in over about 15 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
- 53°F
- Average low
- 39°F
- Precipitation
- 2.89 in
- Record high
- 76°FSep 10, 1935
- Record low
- 18°FSep 27, 1957
- Daylight
- 14 h 18 min to 11 h 28 min
- Cloud cover
- 77%
- Humidity
- 88%
- Dew point
- 40°F
- Wind
- 10.1 mph
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 56°F | 44°F | 73°F 2016 | 31°F 2015 | 58% |
| Sep 2 | 56°F | 44°F | 74°F 2016 | 30°F 1926 | 58% |
| Sep 3 | 56°F | 44°F | 70°F 1937 | 30°F 1940 | 58% |
| Sep 4 | 58°F | 44°F | 69°F 1963 | 28°F 1940 | 58% |
| Sep 5 | 57°F | 43°F | 69°F 1924 | 28°F 1927 | 58% |
| Sep 6 | 57°F | 43°F | 69°F 1946 | 29°F 1960 | 57% |
| Sep 7 | 56°F | 44°F | 67°F 1982 | 30°F 1936 | 57% |
| Sep 8 | 56°F | 43°F | 72°F 1935 | 27°F 1970 | 56% |
| Sep 9 | 56°F | 42°F | 74°F 1935 | 25°F 1970 | 55% |
| Sep 10 | 56°F | 42°F | 76°F 1935 | 26°F 1970 | 55% |
| Sep 11 | 56°F | 42°F | 74°F 1935 | 26°F 1927 | 54% |
| Sep 12 | 55°F | 42°F | 70°F 1935 | 27°F 1959 | 54% |
| Sep 13 | 55°F | 41°F | 68°F 1986 | 27°F 1927 | 53% |
| Sep 14 | 55°F | 42°F | 66°F 2006 | 26°F 1935 | 52% |
| Sep 15 | 54°F | 41°F | 63°F 2010 | 26°F 1941 | 51% |
| Sep 16 | 54°F | 40°F | 66°F 1957 | 25°F 1928 | 50% |
| Sep 17 | 52°F | 40°F | 64°F 1995 | 28°F 1934 | 50% |
| Sep 18 | 52°F | 38°F | 68°F 2010 | 26°F 1960 | 50% |
| Sep 19 | 52°F | 38°F | 71°F 2010 | 25°F 1972 | 49% |
| Sep 20 | 51°F | 38°F | 64°F 1926 | 24°F 1939 | 48% |
| Sep 21 | 51°F | 37°F | 64°F 1945 | 25°F 1956 | 48% |
| Sep 22 | 50°F | 37°F | 63°F 1942 | 23°F 2003 | 47% |
| Sep 23 | 48°F | 35°F | 64°F 1934 | 22°F 1992 | 46% |
| Sep 24 | 48°F | 35°F | 64°F 1934 | 19°F 1992 | 46% |
| Sep 25 | 47°F | 35°F | 63°F 1926 | 21°F 1983 | 46% |
| Sep 26 | 47°F | 34°F | 57°F 2018 | 20°F 1983 | 46% |
| Sep 27 | 47°F | 33°F | 62°F 1966 | 18°F 1957 | 44% |
| Sep 28 | 47°F | 34°F | 68°F 2018 | 18°F 1927 | 44% |
| Sep 29 | 47°F | 34°F | 67°F 2018 | 19°F 1992 | 44% |
| Sep 30 | 47°F | 34°F | 70°F 1954 | 18°F 1970 | 44% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (AKDT).
- September 1
- sunrise 7:43 AM, sunset 10:01 PM
- September 30
- sunrise 8:58 AM, sunset 8:26 PM
Other months
Sources
Records: NOAA GHCN-Daily, station USW00026615, 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.