Trenton Weather in September
Average highs run from 88°F on September 1 to 80°F on September 30, and lows from 64°F to 54°F. Normal precipitation for the month is 4.20 in over about 7 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
- 84°F
- Average low
- 59°F
- Precipitation
- 4.20 in
- Record high
- 99°FSep 2, 2011
- Record low
- 39°FSep 21, 1918
- Chance of a freeze
- 0%
- Days of 90°F or more
- 7.8
- Daylight
- 12 h 55 min to 11 h 51 min
- Cloud cover
- 46%
- Humidity
- 66%
- Dew point
- 59°F
- Wind
- 7.2 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 | 88°F | 64°F | 97°F 2011 | 55°F 1919 | 24% | 0% |
| Sep 2 | 88°F | 64°F | 99°F 2011 | 54°F 2017 | 24% | 0% |
| Sep 3 | 88°F | 64°F | 99°F 2011 | 57°F 1919 | 24% | 0% |
| Sep 4 | 88°F | 63°F | 99°F 1913 | 56°F 1905 | 24% | 0% |
| Sep 5 | 87°F | 63°F | 95°F 2015 | 55°F 1905 | 23% | 0% |
| Sep 6 | 87°F | 63°F | 96°F 2015 | 52°F 2011 | 23% | 0% |
| Sep 7 | 87°F | 62°F | 95°F 1912 | 46°F 2017 | 23% | 0% |
| Sep 8 | 87°F | 62°F | 95°F 1912 | 47°F 2017 | 23% | 0% |
| Sep 9 | 86°F | 62°F | 95°F 1912 | 50°F 2011 | 23% | 0% |
| Sep 10 | 86°F | 61°F | 95°F 1912 | 53°F 2011 | 23% | 0% |
| Sep 11 | 86°F | 61°F | 96°F 1912 | 44°F 1917 | 23% | 0% |
| Sep 12 | 85°F | 61°F | 94°F 1895 | 46°F 1917 | 23% | 0% |
| Sep 13 | 85°F | 60°F | 95°F 1915 | 46°F 2015 | 23% | 0% |
| Sep 14 | 85°F | 60°F | 95°F 1909 | 49°F 2015 | 23% | 0% |
| Sep 15 | 85°F | 60°F | 96°F 1903 | 49°F 1904 | 23% | 0% |
| Sep 16 | 84°F | 59°F | 96°F 1895 | 44°F 1904 | 23% | 0% |
| Sep 17 | 84°F | 59°F | 96°F 2019 | 44°F 1916 | 23% | 0% |
| Sep 18 | 84°F | 59°F | 94°F 1895 | 42°F 1903 | 23% | 0% |
| Sep 19 | 83°F | 58°F | 95°F 1909 | 43°F 1903 | 23% | 0% |
| Sep 20 | 83°F | 58°F | 95°F 1895 | 44°F 1903 | 23% | 0% |
| Sep 21 | 83°F | 58°F | 95°F 2018 | 39°F 1918 | 23% | 0% |
| Sep 22 | 82°F | 57°F | 94°F 1895 | 43°F 1913 | 23% | 0% |
| Sep 23 | 82°F | 57°F | 94°F 1895 | 43°F 1913 | 23% | 0% |
| Sep 24 | 82°F | 56°F | 92°F 1921 | 43°F 2012 | 23% | 0% |
| Sep 25 | 81°F | 56°F | 90°F 1908 | 42°F 1903 | 23% | 0% |
| Sep 26 | 81°F | 55°F | 94°F 1895 | 46°F 1907 | 23% | 0% |
| Sep 27 | 81°F | 55°F | 92°F 1895 | 44°F 1912 | 23% | 0% |
| Sep 28 | 80°F | 55°F | 92°F 1911 | 41°F 1909 | 23% | 0% |
| Sep 29 | 80°F | 54°F | 94°F 1911 | 41°F 1916 | 23% | 0% |
| Sep 30 | 80°F | 54°F | 92°F 1911 | 41°F 1916 | 23% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 6:28 AM, sunset 7:23 PM
- September 30
- sunrise 6:50 AM, sunset 6:41 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00406012 (Milan Exp Stn), public domain. Records: NOAA GHCN-Daily, station USC00402680, 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.