Monticello Weather in September
Average highs run from 89°F on September 1 to 85°F on September 30, and lows from 70°F to 63°F. Normal precipitation for the month is 5.46 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
- 87°F
- Average low
- 67°F
- Precipitation
- 5.46 in
- Record high
- 101°FSep 16, 1927
- Record low
- 41°FSep 29, 1967
- Chance of a freeze
- 0%
- Days of 90°F or more
- 10.5
- Daylight
- 12 h 46 min to 11 h 54 min
- Cloud cover
- 51%
- Humidity
- 79%
- Dew point
- 69°F
- Wind
- 4.7 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 | 89°F | 70°F | 99°F 1951 | 59°F 1934 | 35% |
| Sep 2 | 89°F | 70°F | 97°F 1947 | 58°F 1968 | 35% |
| Sep 3 | 89°F | 70°F | 99°F 1951 | 61°F 1934 | 34% |
| Sep 4 | 89°F | 70°F | 100°F 1944 | 62°F 1967 | 34% |
| Sep 5 | 89°F | 70°F | 99°F 1944 | 60°F 1967 | 34% |
| Sep 6 | 89°F | 69°F | 99°F 1932 | 55°F 1997 | 33% |
| Sep 7 | 89°F | 69°F | 99°F 1941 | 57°F 1984 | 33% |
| Sep 8 | 88°F | 69°F | 100°F 1990 | 57°F 1972 | 32% |
| Sep 9 | 88°F | 69°F | 98°F 1954 | 58°F 2011 | 32% |
| Sep 10 | 88°F | 69°F | 97°F 1940 | 52°F 1956 | 31% |
| Sep 11 | 88°F | 69°F | 98°F 1927 | 51°F 1976 | 31% |
| Sep 12 | 88°F | 68°F | 98°F 1927 | 51°F 1940 | 30% |
| Sep 13 | 88°F | 68°F | 98°F 1927 | 54°F 1969 | 30% |
| Sep 14 | 88°F | 68°F | 97°F 1938 | 52°F 1968 | 30% |
| Sep 15 | 88°F | 68°F | 100°F 1927 | 53°F 2015 | 29% |
| Sep 16 | 87°F | 67°F | 101°F 1927 | 53°F 1967 | 29% |
| Sep 17 | 87°F | 67°F | 98°F 1927 | 54°F 1961 | 29% |
| Sep 18 | 87°F | 67°F | 99°F 1942 | 51°F 1981 | 28% |
| Sep 19 | 87°F | 67°F | 99°F 1942 | 47°F 1981 | 28% |
| Sep 20 | 87°F | 66°F | 98°F 1933 | 46°F 1981 | 28% |
| Sep 21 | 87°F | 66°F | 96°F 1936 | 49°F 1981 | 27% |
| Sep 22 | 86°F | 66°F | 95°F 1940 | 49°F 1983 | 27% |
| Sep 23 | 86°F | 66°F | 97°F 1940 | 49°F 1938 | 27% |
| Sep 24 | 86°F | 65°F | 97°F 1933 | 50°F 1990 | 27% |
| Sep 25 | 86°F | 65°F | 97°F 1984 | 49°F 1990 | 26% |
| Sep 26 | 86°F | 65°F | 97°F 2019 | 48°F 1990 | 26% |
| Sep 27 | 85°F | 64°F | 95°F 1972 | 47°F 1940 | 25% |
| Sep 28 | 85°F | 64°F | 95°F 1934 | 50°F 1947 | 25% |
| Sep 29 | 85°F | 64°F | 95°F 1934 | 41°F 1967 | 24% |
| Sep 30 | 85°F | 63°F | 96°F 2006 | 46°F 1967 | 24% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:12 AM, sunset 7:58 PM
- September 30
- sunrise 7:28 AM, sunset 7:22 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00085879 (Monticello 5 Se), public domain. Records: NOAA GHCN-Daily, station USC00096087, 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.