Richland Weather in September
Average highs run from 91°F on September 1 to 85°F on September 30, and lows from 66°F to 58°F. Normal precipitation for the month is 3.42 in over about 5 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
- 88°F
- Average low
- 62°F
- Precipitation
- 3.42 in
- Record high
- 101°FSep 17, 2019
- Record low
- 38°FSep 30, 1967
- Chance of a freeze
- 0%
- Days of 90°F or more
- 9.3
- Daylight
- 12 h 49 min to 11 h 53 min
- Cloud cover
- 49%
- Humidity
- 71%
- Dew point
- 65°F
- Wind
- 6.7 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 | 91°F | 66°F | 99°F 1957 | 63°F 1954 | 23% |
| Sep 2 | 91°F | 66°F | 99°F 1957 | 58°F 1954 | 23% |
| Sep 3 | 91°F | 65°F | 99°F 1990 | 58°F 1954 | 22% |
| Sep 4 | 91°F | 65°F | 98°F 1951 | 57°F 1952 | 22% |
| Sep 5 | 91°F | 65°F | 98°F 1951 | 60°F 1984 | 21% |
| Sep 6 | 90°F | 65°F | 99°F 1990 | 57°F 1953 | 21% |
| Sep 7 | 90°F | 65°F | 100°F 1990 | 57°F 2017 | 21% |
| Sep 8 | 90°F | 64°F | 99°F 2019 | 57°F 2017 | 20% |
| Sep 9 | 90°F | 64°F | 97°F 2010 | 58°F 1956 | 20% |
| Sep 10 | 90°F | 64°F | 99°F 2010 | 54°F 1956 | 20% |
| Sep 11 | 90°F | 64°F | 99°F 2002 | 48°F 1956 | 19% |
| Sep 12 | 89°F | 64°F | 98°F 2010 | 50°F 1956 | 19% |
| Sep 13 | 89°F | 63°F | 97°F 1991 | 53°F 1968 | 19% |
| Sep 14 | 89°F | 63°F | 98°F 1991 | 51°F 1953 | 19% |
| Sep 15 | 89°F | 63°F | 99°F 1991 | 56°F 1985 | 19% |
| Sep 16 | 88°F | 63°F | 98°F 1980 | 53°F 1961 | 18% |
| Sep 17 | 88°F | 62°F | 101°F 2019 | 53°F 1961 | 18% |
| Sep 18 | 88°F | 62°F | 98°F 2010 | 50°F 1981 | 18% |
| Sep 19 | 88°F | 62°F | 97°F 2010 | 49°F 1981 | 18% |
| Sep 20 | 87°F | 61°F | 98°F 2010 | 50°F 1981 | 18% |
| Sep 21 | 87°F | 61°F | 98°F 2010 | 53°F 1996 | 17% |
| Sep 22 | 87°F | 61°F | 97°F 2022 | 48°F 1983 | 17% |
| Sep 23 | 87°F | 60°F | 96°F 2016 | 45°F 1983 | 17% |
| Sep 24 | 86°F | 60°F | 96°F 2016 | 47°F 1982 | 17% |
| Sep 25 | 86°F | 60°F | 96°F 2019 | 48°F 1990 | 17% |
| Sep 26 | 86°F | 59°F | 100°F 2019 | 48°F 2001 | 17% |
| Sep 27 | 86°F | 59°F | 99°F 2019 | 48°F 1956 | 16% |
| Sep 28 | 85°F | 59°F | 97°F 2019 | 48°F 1985 | 16% |
| Sep 29 | 85°F | 58°F | 95°F 2019 | 42°F 1967 | 16% |
| Sep 30 | 85°F | 58°F | 97°F 2019 | 38°F 1967 | 16% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:14 AM, sunset 8:03 PM
- September 30
- sunrise 7:32 AM, sunset 7:25 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00095394 (Lumpkin 2 Se), public domain. Records: NOAA GHCN-Daily, station USW00093842, 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.