Barstow weather in September: Barstow, California: normal highs, lows, rain and records for September
Barstow in September has a normal high of 96°F and a normal low of 66°F, a daily mean of 81°F, falling from 101°F on the 1st to 90°F by the 30th. Measurable precipitation falls on 1 days in a normal September, 0.17 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 36°C and low of 19°C, 4 mm of precipitation in September.
- NOAA stationBarstow Daggett Airport
- Station IDUSW00023161
- Location34.85°N 116.79°W
- Elevation1,917 ft (584 m)
- Population24,897
- Jan 61° 36°
- Feb 66° 40°
- Mar 73° 46°
- Apr 80° 51°
- May 89° 60°
- Jun 99° 68°
- Jul 105° 74°
- Aug 104° 73°
- Sep 96° 66°
- Oct 83° 54°
- Nov 70° 43°
- Dec 60° 35°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Barstow in September?
The normal high is 96°F and the normal low 66°F, for a daily mean of 81.1°F. September is 7.4°F cooler than August and 12.3°F warmer than October. September is the 4th warmest month of the year in Barstow and the 10th wettest. Across the month the normal high falls 11°F, from 101°F on September 1 to 90°F on September 30. From one year to the next September's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 79°F and 83°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 4%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 101°F | 71°F | 4% | 2% |
| September 8 | 99°F | 69°F | 4% | 1% |
| September 15 | 97°F | 66°F | 3% | 1% |
| September 22 | 94°F | 64°F | 3% | 1% |
| September 30 | 90°F | 61°F | 2% | 1% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 101°F | 71°F | 4% | 2% | 13 h |
| September 2 | 101°F | 70°F | 4% | 1% | 12 h 50 min |
| September 3 | 101°F | 70°F | 4% | 1% | 12 h 50 min |
| September 4 | 101°F | 70°F | 4% | 1% | 12 h 50 min |
| September 5 | 100°F | 70°F | 4% | 1% | 12 h 50 min |
| September 6 | 100°F | 69°F | 4% | 1% | 12 h 50 min |
| September 7 | 100°F | 69°F | 4% | 1% | 12 h 40 min |
| September 8 | 99°F | 69°F | 4% | 1% | 12 h 40 min |
| September 9 | 99°F | 68°F | 4% | 1% | 12 h 40 min |
| September 10 | 99°F | 68°F | 3% | 1% | 12 h 40 min |
| September 11 | 98°F | 68°F | 3% | 1% | 12 h 40 min |
| September 12 | 98°F | 67°F | 3% | 1% | 12 h 30 min |
| September 13 | 98°F | 67°F | 3% | 1% | 12 h 30 min |
| September 14 | 97°F | 67°F | 3% | 1% | 12 h 30 min |
| September 15 | 97°F | 66°F | 3% | 1% | 12 h 30 min |
| September 16 | 96°F | 66°F | 3% | 1% | 12 h 20 min |
| September 17 | 96°F | 66°F | 3% | 1% | 12 h 20 min |
| September 18 | 96°F | 65°F | 3% | 1% | 12 h 20 min |
| September 19 | 95°F | 65°F | 3% | 1% | 12 h 20 min |
| September 20 | 95°F | 65°F | 3% | 1% | 12 h 20 min |
| September 21 | 94°F | 64°F | 3% | 1% | 12 h 10 min |
| September 22 | 94°F | 64°F | 3% | 1% | 12 h 10 min |
| September 23 | 94°F | 64°F | 2% | 1% | 12 h 10 min |
| September 24 | 93°F | 63°F | 2% | 1% | 12 h 10 min |
| September 25 | 93°F | 63°F | 2% | 1% | 12 h 10 min |
| September 26 | 92°F | 62°F | 2% | 1% | 12 h |
| September 27 | 92°F | 62°F | 2% | 1% | 12 h |
| September 28 | 91°F | 62°F | 2% | 1% | 12 h |
| September 29 | 91°F | 61°F | 2% | 1% | 12 h |
| September 30 | 90°F | 61°F | 2% | 1% | 11 h 50 min |
- Normal high
- 96°FSeptember average
- Normal low
- 66°FSeptember average
- Precipitation
- 0.17 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 26
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 29
- Sunshine
- 95%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023161; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Barstow in September?
On a given September day the chance of 0.01 inch or more is 3% on average, highest around September 1 (4%). In all, 0.17 in falls on 1 days of a normal September.
In a normal September in Barstow, 26 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023161.
How humid and windy is Barstow in September?
At 3 p.m. the normal temperature is 90°F with 14% relative humidity and a dew point of 35°F; at 6 a.m. it is 63°F with 40% humidity. The wind averages 9.8 mph, most often from the northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 63°F | 38°F | 40% | 10.0 mph | 96% |
| 9 a.m. | 76°F | 39°F | 26% | 10.2 mph | 95% |
| noon | 87°F | 36°F | 17% | 9.1 mph | 94% |
| 3 p.m. | 90°F | 35°F | 14% | 10.3 mph | 90% |
| 6 p.m. | 82°F | 35°F | 18% | 9.3 mph | 93% |
| 9 p.m. | 74°F | 36°F | 25% | 9.8 mph | 95% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023161. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Barstow?
The warmest September temperature on this station's record (since 1943) is 116°F, on September 6, 2020; the coldest is 43°F, on September 26, 1948. The wettest September brought 3.36 in (1976).
The September mean against the 1991-2020 normal of 81.1°F: 2021 83.6°F (+2.5), 2022 84.8°F (+3.7), 2023 79.4°F (−1.7), 2024 84.2°F (+3.1), 2025 80.7°F (−0.4), 2026 81.2°F (+0.1). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 83.6°F | +2.5°F | 0.00 in |
| 2022 | 84.8°F | +3.7°F | 0.01 in |
| 2023 | 79.4°F | −1.7°F | 0.09 in |
| 2024 | 84.2°F | +3.1°F | 0.02 in |
| 2025 | 80.7°F | −0.4°F | 0.48 in |
| 2026 | 81.2°F | +0.1°F | 0.40 in |
Source: records: ACIS, station USW00023161; recent months: ACIS, station USW00023161. Records and recent months use complete months only.
How does September in Barstow compare across California?
Across the 219 places PlainClimate covers in California, September normal highs run from 64°F in Eureka to 104°F in Brawley; Barstow's is 96°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.