Sunnyside Weather in September
Average highs run from 95°F on September 1 to 86°F on September 30, and lows from 66°F to 60°F. Normal precipitation for the month is 0.05 in over about 1 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
- 91°F
- Average low
- 63°F
- Precipitation
- 0.05 in
- Record high
- 114°FSep 6, 2022
- Record low
- 37°FSep 30, 1950
- Chance of a freeze
- 0%
- Days of 90°F or more
- 19.9
- Daylight
- 12 h 57 min to 11 h 50 min
- Cloud cover
- 16%
- Humidity
- 28%
- Dew point
- 40°F
- Wind
- 5.4 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 | 95°F | 66°F | 106°F 2007 | 51°F 1964 | 1% | 0% |
| Sep 2 | 94°F | 66°F | 111°F 2022 | 48°F 1964 | 1% | 0% |
| Sep 3 | 94°F | 66°F | 111°F 1955 | 52°F 1964 | 1% | 0% |
| Sep 4 | 94°F | 66°F | 107°F 1955 | 54°F 1960 | 1% | 0% |
| Sep 5 | 94°F | 66°F | 108°F 2022 | 52°F 1965 | 1% | 0% |
| Sep 6 | 94°F | 65°F | 114°F 2022 | 51°F 1951 | 1% | 0% |
| Sep 7 | 93°F | 65°F | 111°F 2022 | 50°F 1964 | 1% | 0% |
| Sep 8 | 93°F | 65°F | 106°F 2022 | 50°F 1964 | 2% | 0% |
| Sep 9 | 93°F | 65°F | 107°F 2021 | 50°F 1964 | 2% | 0% |
| Sep 10 | 93°F | 65°F | 105°F 2015 | 48°F 1952 | 2% | 0% |
| Sep 11 | 92°F | 65°F | 104°F 1979 | 44°F 1952 | 2% | 0% |
| Sep 12 | 92°F | 64°F | 105°F 1983 | 48°F 1952 | 2% | 0% |
| Sep 13 | 92°F | 64°F | 106°F 1983 | 48°F 1970 | 2% | 0% |
| Sep 14 | 92°F | 64°F | 106°F 2012 | 48°F 1970 | 2% | 0% |
| Sep 15 | 91°F | 64°F | 104°F 1983 | 45°F 1970 | 2% | 0% |
| Sep 16 | 91°F | 64°F | 104°F 1983 | 49°F 1954 | 2% | 0% |
| Sep 17 | 91°F | 63°F | 105°F 1979 | 48°F 1965 | 3% | 0% |
| Sep 18 | 90°F | 63°F | 105°F 1984 | 48°F 1978 | 3% | 0% |
| Sep 19 | 90°F | 63°F | 104°F 2016 | 44°F 1978 | 3% | 0% |
| Sep 20 | 90°F | 63°F | 102°F 1949 | 46°F 1965 | 3% | 0% |
| Sep 21 | 89°F | 62°F | 102°F 1949 | 42°F 1968 | 3% | 0% |
| Sep 22 | 89°F | 62°F | 104°F 1949 | 41°F 1968 | 3% | 0% |
| Sep 23 | 89°F | 62°F | 105°F 1949 | 47°F 1968 | 3% | 0% |
| Sep 24 | 88°F | 62°F | 103°F 2024 | 48°F 1948 | 3% | 0% |
| Sep 25 | 88°F | 61°F | 100°F 1963 | 43°F 1948 | 3% | 0% |
| Sep 26 | 87°F | 61°F | 107°F 1963 | 43°F 1948 | 4% | 0% |
| Sep 27 | 87°F | 61°F | 104°F 1963 | 44°F 1948 | 4% | 0% |
| Sep 28 | 87°F | 60°F | 101°F 2010 | 43°F 1971 | 4% | 0% |
| Sep 29 | 86°F | 60°F | 102°F 1992 | 45°F 1965 | 4% | 0% |
| Sep 30 | 86°F | 60°F | 101°F 2010 | 37°F 1950 | 4% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:30 AM, sunset 7:27 PM
- September 30
- sunrise 6:53 AM, sunset 6:43 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00093193 (Fresno Yosemite Intl AP), public domain. Records: NOAA GHCN-Daily, station USW00093193, 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.