San Jacinto weather in September: San Jacinto, California: normal highs, lows, rain and records for September
San Jacinto in September has a normal high of 92°F and a normal low of 61°F, a daily mean of 76°F, falling from 96°F on the 1st to 87°F by the 30th. Measurable precipitation falls on 1 days in a normal September, 0.26 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 33°C and low of 16°C, 7 mm of precipitation in September.
- NOAA stationSan Jacinto
- Station IDUSC00047813
- Location33.80°N 116.98°W
- Elevation1,525 ft (465 m)
- From the center1 miles
- Population55,515
- Jan 66° 40°
- Feb 66° 42°
- Mar 70° 45°
- Apr 74° 48°
- May 80° 53°
- Jun 89° 58°
- Jul 95° 64°
- Aug 97° 64°
- Sep 92° 61°
- Oct 82° 53°
- Nov 73° 44°
- Dec 65° 39°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Jacinto in September?
The normal high is 92°F and the normal low 61°F, for a daily mean of 76.3°F. September is 4.1°F cooler than August and 8.8°F warmer than October. September is the 3rd warmest month of the year in San Jacinto and the 9th wettest. Across the month the normal high falls 9°F, from 96°F on September 1 to 87°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 74°F and 79°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 | 96°F | 63°F | 3% | 2% |
| September 8 | 94°F | 62°F | 3% | 2% |
| September 15 | 92°F | 61°F | 3% | 2% |
| September 22 | 90°F | 60°F | 3% | 2% |
| September 30 | 87°F | 57°F | 4% | 2% |
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 | 96°F | 63°F | 3% | 2% | 12 h 50 min |
| September 2 | 95°F | 63°F | 3% | 2% | 12 h 50 min |
| September 3 | 95°F | 63°F | 3% | 2% | 12 h 50 min |
| September 4 | 95°F | 63°F | 3% | 2% | 12 h 50 min |
| September 5 | 95°F | 63°F | 3% | 2% | 12 h 50 min |
| September 6 | 95°F | 63°F | 3% | 2% | 12 h 40 min |
| September 7 | 94°F | 63°F | 3% | 2% | 12 h 40 min |
| September 8 | 94°F | 62°F | 3% | 2% | 12 h 40 min |
| September 9 | 94°F | 62°F | 3% | 2% | 12 h 40 min |
| September 10 | 94°F | 62°F | 3% | 2% | 12 h 40 min |
| September 11 | 93°F | 62°F | 3% | 2% | 12 h 30 min |
| September 12 | 93°F | 62°F | 3% | 2% | 12 h 30 min |
| September 13 | 93°F | 62°F | 3% | 2% | 12 h 30 min |
| September 14 | 93°F | 61°F | 3% | 2% | 12 h 30 min |
| September 15 | 92°F | 61°F | 3% | 2% | 12 h 30 min |
| September 16 | 92°F | 61°F | 3% | 2% | 12 h 20 min |
| September 17 | 92°F | 61°F | 3% | 2% | 12 h 20 min |
| September 18 | 91°F | 60°F | 3% | 2% | 12 h 20 min |
| September 19 | 91°F | 60°F | 3% | 2% | 12 h 20 min |
| September 20 | 91°F | 60°F | 3% | 2% | 12 h 20 min |
| September 21 | 90°F | 60°F | 3% | 2% | 12 h 10 min |
| September 22 | 90°F | 60°F | 3% | 2% | 12 h 10 min |
| September 23 | 90°F | 59°F | 3% | 2% | 12 h 10 min |
| September 24 | 89°F | 59°F | 3% | 2% | 12 h 10 min |
| September 25 | 89°F | 59°F | 3% | 2% | 12 h 10 min |
| September 26 | 89°F | 58°F | 3% | 2% | 12 h |
| September 27 | 88°F | 58°F | 4% | 2% | 12 h |
| September 28 | 88°F | 58°F | 4% | 2% | 12 h |
| September 29 | 88°F | 58°F | 4% | 2% | 12 h |
| September 30 | 87°F | 57°F | 4% | 2% | 11 h 50 min |
- Normal high
- 92°FSeptember average
- Normal low
- 61°FSeptember average
- Precipitation
- 0.26 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 22
- Daylight
- 12 h 50 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 28
- Sunshine
- 94%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00047813; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Jacinto in September?
On a given September day the chance of 0.01 inch or more is 3% on average, highest around September 29 (4%). In all, 0.26 in falls on 1 days of a normal September.
In a normal September in San Jacinto, 22 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00047813.
What are the records for September in San Jacinto?
The September mean against the 1991-2020 normal of 76.3°F: 2021 77.7°F (+1.4), 2022 79.7°F (+3.4), 2023 74.0°F (−2.3), 2024 78.3°F (+2.0), 2025 77.5°F (+1.2), 2026 76.9°F (+0.6). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.7°F | +1.4°F | 0.00 in |
| 2022 | 79.7°F | +3.4°F | 0.56 in |
| 2023 | 74.0°F | −2.3°F | 0.07 in |
| 2024 | 78.3°F | +2.0°F | 0.17 in |
| 2025 | 77.5°F | +1.2°F | 0.44 in |
| 2026 | 76.9°F | +0.6°F | 0.26 in |
Source: recent months: ACIS, station USC00047813. Records and recent months use complete months only.
How does September in San Jacinto 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; San Jacinto's is 92°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- San Jacinto in August97°F by day, 64°F at night
- San Jacinto in October82°F by day, 53°F at night
- San Jacinto 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