Joshua Tree weather in September: Joshua Tree, California: normal highs, lows, rain and records for September
Joshua Tree in September has a normal high of 93°F and a normal low of 64°F, a daily mean of 78°F, falling from 97°F on the 1st to 88°F by the 30th. Measurable precipitation falls on 2 days in a normal September, 0.22 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 34°C and low of 18°C, 6 mm of precipitation in September.
- NOAA stationJoshua Tree
- Station IDUSC00044405
- Location34.15°N 116.27°W
- Elevation2,563 ft (781 m)
- Population (census place)6,767
- Jan 60° 38°
- Feb 63° 39°
- Mar 70° 43°
- Apr 77° 47°
- May 86° 54°
- Jun 95° 61°
- Jul 102° 70°
- Aug 100° 70°
- Sep 93° 64°
- Oct 82° 52°
- Nov 69° 43°
- Dec 60° 36°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Joshua Tree in September?
The normal high is 93°F and the normal low 64°F, for a daily mean of 78.2°F. September is 6.7°F cooler than August and 11.1°F warmer than October. September is the 3rd warmest month of the year in Joshua Tree and the 8th wettest. Across the month the normal high falls 9°F, from 97°F on September 1 to 88°F on September 30. From one year to the next September's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 76°F and 81°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 6%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 97°F | 68°F | 6% | 3% |
| September 8 | 95°F | 67°F | 6% | 3% |
| September 15 | 93°F | 64°F | 5% | 3% |
| September 22 | 90°F | 62°F | 5% | 2% |
| September 30 | 88°F | 58°F | 4% | 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 | 97°F | 68°F | 6% | 3% | 13 h |
| September 2 | 97°F | 68°F | 6% | 3% | 12 h 50 min |
| September 3 | 97°F | 68°F | 6% | 3% | 12 h 50 min |
| September 4 | 96°F | 68°F | 6% | 3% | 12 h 50 min |
| September 5 | 96°F | 67°F | 6% | 3% | 12 h 50 min |
| September 6 | 96°F | 67°F | 6% | 3% | 12 h 40 min |
| September 7 | 96°F | 67°F | 6% | 3% | 12 h 40 min |
| September 8 | 95°F | 67°F | 6% | 3% | 12 h 40 min |
| September 9 | 95°F | 66°F | 6% | 3% | 12 h 40 min |
| September 10 | 95°F | 66°F | 6% | 3% | 12 h 40 min |
| September 11 | 94°F | 66°F | 6% | 3% | 12 h 30 min |
| September 12 | 94°F | 65°F | 6% | 3% | 12 h 30 min |
| September 13 | 94°F | 65°F | 6% | 3% | 12 h 30 min |
| September 14 | 93°F | 65°F | 6% | 3% | 12 h 30 min |
| September 15 | 93°F | 64°F | 5% | 3% | 12 h 30 min |
| September 16 | 93°F | 64°F | 5% | 3% | 12 h 20 min |
| September 17 | 92°F | 64°F | 5% | 3% | 12 h 20 min |
| September 18 | 92°F | 63°F | 5% | 2% | 12 h 20 min |
| September 19 | 92°F | 63°F | 5% | 2% | 12 h 20 min |
| September 20 | 91°F | 62°F | 5% | 2% | 12 h 20 min |
| September 21 | 91°F | 62°F | 5% | 2% | 12 h 10 min |
| September 22 | 90°F | 62°F | 5% | 2% | 12 h 10 min |
| September 23 | 90°F | 61°F | 5% | 2% | 12 h 10 min |
| September 24 | 90°F | 61°F | 4% | 2% | 12 h 10 min |
| September 25 | 89°F | 60°F | 4% | 2% | 12 h 10 min |
| September 26 | 89°F | 60°F | 4% | 2% | 12 h |
| September 27 | 89°F | 59°F | 4% | 2% | 12 h |
| September 28 | 88°F | 59°F | 4% | 2% | 12 h |
| September 29 | 88°F | 58°F | 4% | 2% | 12 h |
| September 30 | 88°F | 58°F | 4% | 1% | 11 h 50 min |
- Normal high
- 93°FSeptember average
- Normal low
- 64°FSeptember average
- Precipitation
- 0.22 inmonth total
- Days with precipitation
- 20.01 inch or more
- Days at 90°F or more
- 25
- 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 USC00044405; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Joshua Tree in September?
On a given September day the chance of 0.01 inch or more is 5% on average, highest around September 1 (6%). In all, 0.22 in falls on 2 days of a normal September.
In a normal September in Joshua Tree, 25 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00044405.
What are the records for September in Joshua Tree?
The September mean against the 1991-2020 normal of 78.2°F: 2021 79.8°F (+1.6), 2022 80.8°F (+2.6), 2023 78.1°F (−0.1), 2024 81.7°F (+3.5), 2025 78.5°F (+0.3), 2026 79.1°F (+0.9). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 79.8°F | +1.6°F | 0.14 in |
| 2022 | 80.8°F | +2.6°F | 1.05 in |
| 2023 | 78.1°F | −0.1°F | 0.00 in |
| 2024 | 81.7°F | +3.5°F | 0.05 in |
| 2025 | 78.5°F | +0.3°F | 1.16 in |
| 2026 | 79.1°F | +0.9°F | 1.93 in |
Source: recent months: ACIS, station USC00044405. Records and recent months use complete months only.
How does September in Joshua Tree 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; Joshua Tree's is 93°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Joshua Tree in August100°F by day, 70°F at night
- Joshua Tree in October82°F by day, 52°F at night
- Joshua Tree through the yearEvery month, frost dates, records and recent years
- California in SeptemberThe statewide normal and the warmest and coolest places
- Brawley: California's warmest Septembernormal high 104°F