Barstow Weather in September
Average highs run from 98°F on September 1 to 88°F on September 30, and lows from 68°F to 59°F. Normal precipitation for the month is 0.25 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
- 93°F
- Average low
- 63°F
- Precipitation
- 0.25 in
- Record high
- 116°FSep 6, 2020
- Record low
- 43°FSep 26, 1948
- Chance of a freeze
- 0%
- Days of 90°F or more
- 24.5
- Daylight
- 12 h 53 min to 11 h 51 min
- Cloud cover
- 19%
- Humidity
- 28%
- Dew point
- 37°F
- Wind
- 8.5 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 | 98°F | 68°F | 112°F 2022 | 57°F 1957 | 3% | 0% |
| Sep 2 | 98°F | 67°F | 112°F 1950 | 51°F 1964 | 3% | 0% |
| Sep 3 | 98°F | 67°F | 110°F 1948 | 57°F 1964 | 3% | 0% |
| Sep 4 | 97°F | 67°F | 113°F 2020 | 54°F 1961 | 3% | 0% |
| Sep 5 | 97°F | 67°F | 114°F 2020 | 57°F 1985 | 3% | 0% |
| Sep 6 | 97°F | 66°F | 116°F 2020 | 57°F 1985 | 3% | 0% |
| Sep 7 | 97°F | 66°F | 110°F 2021 | 54°F 1965 | 3% | 0% |
| Sep 8 | 96°F | 66°F | 109°F 2021 | 54°F 1965 | 3% | 0% |
| Sep 9 | 96°F | 65°F | 110°F 1993 | 56°F 2020 | 3% | 0% |
| Sep 10 | 96°F | 65°F | 109°F 1993 | 51°F 1985 | 3% | 0% |
| Sep 11 | 95°F | 65°F | 108°F 1971 | 50°F 1952 | 3% | 0% |
| Sep 12 | 95°F | 65°F | 108°F 1971 | 49°F 1985 | 3% | 0% |
| Sep 13 | 95°F | 64°F | 111°F 1971 | 52°F 1952 | 3% | 0% |
| Sep 14 | 94°F | 64°F | 111°F 1971 | 52°F 1993 | 3% | 0% |
| Sep 15 | 94°F | 64°F | 108°F 1995 | 55°F 1966 | 3% | 0% |
| Sep 16 | 93°F | 63°F | 108°F 2000 | 52°F 1959 | 3% | 0% |
| Sep 17 | 93°F | 63°F | 105°F 2000 | 53°F 1946 | 3% | 0% |
| Sep 18 | 93°F | 63°F | 105°F 1956 | 51°F 1946 | 3% | 0% |
| Sep 19 | 92°F | 62°F | 106°F 2000 | 50°F 1947 | 3% | 0% |
| Sep 20 | 92°F | 62°F | 105°F 2000 | 51°F 1965 | 3% | 0% |
| Sep 21 | 91°F | 62°F | 104°F 1949 | 50°F 1986 | 3% | 0% |
| Sep 22 | 91°F | 61°F | 105°F 1949 | 49°F 2017 | 3% | 0% |
| Sep 23 | 91°F | 61°F | 106°F 1949 | 49°F 1945 | 3% | 0% |
| Sep 24 | 90°F | 61°F | 106°F 1947 | 48°F 2017 | 3% | 0% |
| Sep 25 | 90°F | 60°F | 104°F 2015 | 48°F 1948 | 3% | 0% |
| Sep 26 | 89°F | 60°F | 103°F 1963 | 43°F 1948 | 3% | 0% |
| Sep 27 | 89°F | 60°F | 105°F 2009 | 45°F 1948 | 2% | 0% |
| Sep 28 | 88°F | 59°F | 104°F 2024 | 49°F 1948 | 2% | 0% |
| Sep 29 | 88°F | 59°F | 104°F 1963 | 45°F 1945 | 2% | 0% |
| Sep 30 | 88°F | 59°F | 104°F 1980 | 47°F 2007 | 2% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:21 AM, sunset 7:14 PM
- September 30
- sunrise 6:42 AM, sunset 6:33 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00040521 (Barstow), public domain. Records: NOAA GHCN-Daily, station USW00023161, 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.