Mountain City Weather in September
Average highs run from 83°F on September 1 to 75°F on September 30, and lows from 63°F to 54°F. Normal precipitation for the month is 5.74 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
- 79°F
- Average low
- 59°F
- Precipitation
- 5.74 in
- Record high
- 98°FSep 4, 1975
- Record low
- 27°FSep 30, 1967
- Chance of a freeze
- 0%
- Days of 90°F or more
- 0.7
- Daylight
- 12 h 54 min to 11 h 51 min
- Cloud cover
- 51%
- Humidity
- 73%
- Dew point
- 57°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 | 83°F | 63°F | 95°F 1951 | 45°F 1954 | 36% | 0% |
| Sep 2 | 82°F | 62°F | 93°F 1957 | 40°F 1954 | 35% | 0% |
| Sep 3 | 82°F | 62°F | 95°F 1975 | 46°F 1987 | 35% | 0% |
| Sep 4 | 82°F | 62°F | 98°F 1975 | 42°F 1952 | 35% | 0% |
| Sep 5 | 82°F | 62°F | 98°F 1954 | 43°F 2010 | 35% | 0% |
| Sep 6 | 82°F | 62°F | 97°F 1954 | 42°F 1984 | 34% | 0% |
| Sep 7 | 82°F | 61°F | 95°F 1954 | 43°F 2010 | 34% | 0% |
| Sep 8 | 81°F | 61°F | 93°F 1954 | 42°F 1984 | 34% | 0% |
| Sep 9 | 81°F | 61°F | 92°F 1978 | 39°F 1998 | 34% | 0% |
| Sep 10 | 81°F | 61°F | 90°F 1947 | 40°F 1998 | 33% | 0% |
| Sep 11 | 81°F | 60°F | 89°F 2019 | 38°F 1976 | 33% | 0% |
| Sep 12 | 80°F | 60°F | 92°F 1962 | 40°F 1976 | 33% | 0% |
| Sep 13 | 80°F | 60°F | 92°F 1962 | 42°F 1976 | 33% | 0% |
| Sep 14 | 80°F | 59°F | 91°F 1962 | 33°F 1953 | 33% | 0% |
| Sep 15 | 80°F | 59°F | 91°F 1947 | 39°F 1985 | 33% | 0% |
| Sep 16 | 79°F | 59°F | 90°F 1947 | 37°F 1961 | 32% | 0% |
| Sep 17 | 79°F | 58°F | 90°F 1953 | 37°F 1961 | 32% | 0% |
| Sep 18 | 79°F | 58°F | 93°F 1954 | 38°F 1961 | 32% | 0% |
| Sep 19 | 79°F | 58°F | 94°F 1954 | 33°F 1981 | 32% | 0% |
| Sep 20 | 78°F | 57°F | 89°F 1954 | 34°F 1981 | 32% | 0% |
| Sep 21 | 78°F | 57°F | 91°F 1978 | 33°F 1956 | 32% | 0% |
| Sep 22 | 78°F | 57°F | 91°F 1955 | 35°F 1983 | 32% | 0% |
| Sep 23 | 77°F | 56°F | 88°F 2024 | 33°F 1983 | 32% | 0% |
| Sep 24 | 77°F | 56°F | 88°F 1961 | 29°F 1963 | 32% | 0% |
| Sep 25 | 77°F | 56°F | 89°F 1958 | 34°F 2012 | 32% | 0% |
| Sep 26 | 77°F | 55°F | 89°F 1958 | 36°F 2001 | 32% | 0% |
| Sep 27 | 76°F | 55°F | 89°F 1998 | 38°F 1991 | 31% | 0% |
| Sep 28 | 76°F | 54°F | 89°F 1986 | 31°F 1947 | 31% | 0% |
| Sep 29 | 76°F | 54°F | 87°F 1953 | 34°F 1947 | 31% | 0% |
| Sep 30 | 75°F | 54°F | 89°F 1954 | 27°F 1967 | 31% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:06 AM, sunset 8:00 PM
- September 30
- sunrise 7:28 AM, sunset 7:19 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00091982 (Clayton 1 Ssw), public domain. Records: NOAA GHCN-Daily, station USC00313228, 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.