El Cajon weather in September: El Cajon, California: normal highs, lows, rain and records for September
El Cajon in September has a normal high of 87°F and a normal low of 62°F, a daily mean of 75°F, falling from 89°F on the 1st to 84°F by the 30th. Measurable precipitation falls on 1 days in a normal September, 0.11 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 17°C, 3 mm of precipitation in September.
- NOAA stationEl Cajon
- Station IDUSC00042706
- Location32.80°N 116.93°W
- Elevation495 ft (151 m)
- From the center2 miles
- Population103,291
- Jan 69° 43°
- Feb 69° 44°
- Mar 71° 48°
- Apr 75° 51°
- May 76° 56°
- Jun 81° 59°
- Jul 86° 63°
- Aug 89° 65°
- Sep 87° 62°
- Oct 81° 56°
- Nov 75° 47°
- Dec 69° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is El Cajon in September?
The normal high is 87°F and the normal low 62°F, for a daily mean of 74.7°F. September is 1.9°F cooler than August and 6.4°F warmer than October. September is the 2nd warmest month of the year in El Cajon and the 10th wettest. Across the month the normal high falls 5°F, from 89°F on September 1 to 84°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 72°F and 77°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 3%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 89°F | 64°F | 1% | 1% |
| September 8 | 89°F | 63°F | 2% | 1% |
| September 15 | 88°F | 62°F | 2% | 1% |
| September 22 | 86°F | 61°F | 2% | 1% |
| September 30 | 84°F | 60°F | 3% | 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 | 89°F | 64°F | 1% | 1% | 12 h 50 min |
| September 2 | 89°F | 64°F | 2% | 1% | 12 h 50 min |
| September 3 | 89°F | 64°F | 2% | 1% | 12 h 50 min |
| September 4 | 89°F | 64°F | 2% | 1% | 12 h 50 min |
| September 5 | 89°F | 64°F | 2% | 1% | 12 h 40 min |
| September 6 | 89°F | 64°F | 2% | 1% | 12 h 40 min |
| September 7 | 89°F | 63°F | 2% | 1% | 12 h 40 min |
| September 8 | 89°F | 63°F | 2% | 1% | 12 h 40 min |
| September 9 | 89°F | 63°F | 2% | 1% | 12 h 40 min |
| September 10 | 89°F | 63°F | 2% | 1% | 12 h 40 min |
| September 11 | 89°F | 63°F | 2% | 1% | 12 h 30 min |
| September 12 | 88°F | 63°F | 2% | 1% | 12 h 30 min |
| September 13 | 88°F | 63°F | 2% | 1% | 12 h 30 min |
| September 14 | 88°F | 63°F | 2% | 1% | 12 h 30 min |
| September 15 | 88°F | 62°F | 2% | 1% | 12 h 30 min |
| September 16 | 88°F | 62°F | 2% | 1% | 12 h 20 min |
| September 17 | 87°F | 62°F | 2% | 1% | 12 h 20 min |
| September 18 | 87°F | 62°F | 2% | 1% | 12 h 20 min |
| September 19 | 87°F | 62°F | 2% | 1% | 12 h 20 min |
| September 20 | 87°F | 62°F | 2% | 1% | 12 h 20 min |
| September 21 | 86°F | 61°F | 2% | 1% | 12 h 10 min |
| September 22 | 86°F | 61°F | 2% | 1% | 12 h 10 min |
| September 23 | 86°F | 61°F | 2% | 1% | 12 h 10 min |
| September 24 | 86°F | 61°F | 2% | 2% | 12 h 10 min |
| September 25 | 85°F | 61°F | 2% | 2% | 12 h 10 min |
| September 26 | 85°F | 60°F | 3% | 2% | 12 h |
| September 27 | 85°F | 60°F | 3% | 2% | 12 h |
| September 28 | 85°F | 60°F | 3% | 2% | 12 h |
| September 29 | 84°F | 60°F | 3% | 2% | 12 h |
| September 30 | 84°F | 60°F | 3% | 2% | 12 h |
- Normal high
- 87°FSeptember average
- Normal low
- 62°FSeptember average
- Precipitation
- 0.11 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 14
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 26
- Sunshine
- 93%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00042706; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in El Cajon in September?
On a given September day the chance of 0.01 inch or more is 2% on average, highest around September 30 (3%). In all, 0.11 in falls on 1 days of a normal September.
In a normal September in El Cajon, 14 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00042706.
What are the records for September in El Cajon?
The warmest September temperature on El Cajon's official record (since 1899) is 114°F, on September 5, 2020; the coldest is 37°F, on September 18, 1900. The wettest September brought 5.03 in (1939).
The September mean against the 1991-2020 normal of 74.7°F: 2021 75.8°F (+1.1), 2022 77.7°F (+3.0), 2023 72.2°F (−2.5), 2024 74.5°F (−0.2), 2025 75.8°F (+1.1), 2026 77.2°F (+2.5). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.8°F | +1.1°F | 0.13 in |
| 2022 | 77.7°F | +3.0°F | 0.11 in |
| 2023 | 72.2°F | −2.5°F | 0.05 in |
| 2024 | 74.5°F | −0.2°F | 0.00 in |
| 2025 | 75.8°F | +1.1°F | 0.17 in |
| 2026 | 77.2°F | +2.5°F | 0.05 in |
Source: records: ACIS, NWS threaded record ELJC1thr; recent months: ACIS, station USC00042706. Records and recent months use complete months only.
How does September in El Cajon 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; El Cajon's is 87°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.