El Cajon, CA weather in September
September in El Cajon: warm and dry. Highs 87°F, lows 62°F, about 1 wet day. This is the peak of the warm season in El Cajon.
- Normal high
- 87°F
- Normal low
- 62°F
- Wet days
- 1
- 0.2 in total
- Muggy days
- 5
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 89°F | 84°F |
| Normal low | 64°F | 60°F |
| Chance of a wet day | 3% | 5% |
| Sunrise / sunset | 6:22 am / 7:13 pm | 6:41 am / 6:34 pm |
| Daylight | 12.8 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical September day
- 6 am67°Fdew point 61°F
- 9 am72°Fdew point 61°F
- Noon75°Fdew point 61°F
- 3 pm75°Fdew point 61°F
- 6 pm71°Fdew point 61°F
- 9 pm69°Fdew point 62°F
NOAA hourly normals (local standard time) from San Diego Lindbergh Fld (14 mi away); average wind 6 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F4 of 30
- Hot dayshigh 90°F or more14 of 30
- Muggy daysdaily mean dew point 65°F or more5 of 30
- Wet daysat least 0.01 in of rain or melted snow1 of 30
- Notable rainat least 0.10 in0 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 0.2 in; a dry September brings about 0.0 in and a wet one about 0.2 in (25th and 75th percentiles). Days with half an inch or more are rare.
How September varies from year to year
- Warmest September, 1991-20202020: average high 93°F
- Coolest September2011: average high 84°F
- Wettest September1997: 1.0 in
- Driest September1992: no measurable precipitation
- Highest reading114°F (September 5, 2020)
- Lowest reading49°F (September 30, 2019)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 89°F | 87°F | 81°F |
| Normal low | 65°F | 62°F | 56°F |
| Wet days | 0 | 1 | 3 |
| Comfortable days | 2 | 4 | 12 |
| Daylight | 13.3 h | 12.4 h | 11.4 h |
Highs change by -2°F from August and -6°F into October.
Nearby alternatives in September
- Warmer: Temecula, CA49 mi · high 93°F · 1 wet day
- Cooler: San Diego, CA13 mi · high 77°F · 1 wet day
How El Cajon ranks in September
- Normal high111th warmest of 378 cities; 26th of 60 in California
- Wet days52nd driest of 378
- Comfortable days222nd most of 342
What to pack for El Cajon in September
- Light, breathable clothing – highs near 87°F and about 5 muggy days
- Layers – afternoons near 87°F but nights near 62°F
Heating and cooling
September has 1 heating degree days and 292 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is El Cajon in September?
The normal high is 87°F and the normal low is 62°F. From 1991 to 2020 the hottest September reading was 114°F (September 5, 2020).
Does it rain a lot in El Cajon in September?
About 1 days in September have at least 0.01 in of precipitation, and the normal total is 0.2 in. The wettest September in 1991-2020 was in 1997 (1.0 in); the driest was in 1992, with no measurable precipitation.
Is September a good time to visit El Cajon?
September ranks 12th of 12 months on our comfort score for El Cajon (49 out of 100). It has about 4 comfortable days and about 14 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature and frost dates: El Cajon (USC00042706), 2.0 mi ENE of the city center, 495 ft (60 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Lakeside 2 E (USC00044710), 5.7 mi NE of the city center, 690 ft (255 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: San Diego Lindbergh Fld (USW00023188), 14 mi WSW of the city center, 15 ft (420 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Diego International Airport (722900-23188), 14 mi WSW of the city center, 15 ft (420 ft lower than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).