Merced County Weather in September
Average highs run from 93°F on September 1 to 85°F on September 30, and lows from 51°F to 48°F. Normal precipitation for the month is 0.11 in over about 0 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
- 90°F
- Average low
- 50°F
- Precipitation
- 0.11 in
- Record high
- 110°FSep 8, 1904
- Record low
- 32°FSep 22, 1906
- Chance of a freeze
- 0%
- Days of 90°F or more
- 16.2
- Daylight
- 12 h 57 min to 11 h 49 min
- Cloud cover
- 15%
- Humidity
- 40%
- Dew point
- 44°F
- Wind
- 7.8 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 | 93°F | 51°F | 106°F 1905 | 45°F 1959 | 1% |
| Sep 2 | 93°F | 51°F | 108°F 1903 | 47°F 1905 | 1% |
| Sep 3 | 93°F | 51°F | 108°F 1903 | 44°F 1905 | 1% |
| Sep 4 | 92°F | 51°F | 107°F 1903 | 44°F 1905 | 1% |
| Sep 5 | 92°F | 51°F | 106°F 1904 | 41°F 1905 | 1% |
| Sep 6 | 92°F | 51°F | 108°F 1904 | 42°F 1905 | 1% |
| Sep 7 | 92°F | 51°F | 109°F 1904 | 42°F 1905 | 1% |
| Sep 8 | 92°F | 51°F | 110°F 1904 | 41°F 1900 | 1% |
| Sep 9 | 92°F | 50°F | 105°F 1936 | 44°F 1927 | 1% |
| Sep 10 | 91°F | 50°F | 106°F 1944 | 45°F 1901 | 1% |
| Sep 11 | 91°F | 50°F | 106°F 1904 | 44°F 1952 | 2% |
| Sep 12 | 91°F | 50°F | 104°F 1922 | 45°F 1905 | 2% |
| Sep 13 | 91°F | 50°F | 103°F 1922 | 45°F 1928 | 2% |
| Sep 14 | 90°F | 50°F | 103°F 1922 | 41°F 1927 | 2% |
| Sep 15 | 90°F | 50°F | 103°F 1929 | 40°F 1903 | 2% |
| Sep 16 | 90°F | 50°F | 105°F 1909 | 45°F 1903 | 2% |
| Sep 17 | 90°F | 50°F | 104°F 1937 | 39°F 2006 | 2% |
| Sep 18 | 89°F | 50°F | 108°F 1913 | 35°F 1978 | 2% |
| Sep 19 | 89°F | 49°F | 110°F 1913 | 40°F 1905 | 2% |
| Sep 20 | 89°F | 49°F | 104°F 1939 | 39°F 2004 | 2% |
| Sep 21 | 88°F | 49°F | 105°F 1905 | 42°F 1903 | 3% |
| Sep 22 | 88°F | 49°F | 105°F 1905 | 32°F 1906 | 3% |
| Sep 23 | 88°F | 49°F | 104°F 1939 | 44°F 1981 | 3% |
| Sep 24 | 87°F | 49°F | 105°F 1939 | 42°F 1931 | 3% |
| Sep 25 | 87°F | 49°F | 102°F 1975 | 40°F 1948 | 3% |
| Sep 26 | 87°F | 49°F | 104°F 1963 | 38°F 1948 | 3% |
| Sep 27 | 86°F | 48°F | 103°F 1963 | 40°F 1948 | 4% |
| Sep 28 | 86°F | 48°F | 104°F 2009 | 40°F 1905 | 4% |
| Sep 29 | 86°F | 48°F | 102°F 1906 | 35°F 1905 | 4% |
| Sep 30 | 85°F | 48°F | 101°F 1999 | 37°F 1905 | 4% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:34 AM, sunset 7:31 PM
- September 30
- sunrise 6:58 AM, sunset 6:47 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00093243 (Merced 23 Wsw), public domain. Records: NOAA GHCN-Daily, station USC00045532, 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.