El Cajon, CA weather in August
Expect hot, dry weather in El Cajon in August, with highs near 89°F and lows near 65°F. Rain is rare. It is one of the warmest months in El Cajon.
- Normal high
- 89°F
- Normal low
- 65°F
- Wet days
- 0
- 0.03 in total
- Muggy days
- 7
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 87°F | 89°F |
| Normal low | 65°F | 64°F |
| Chance of a wet day | 2% | 2% |
| Sunrise / sunset | 6:01 am / 7:46 pm | 6:21 am / 7:14 pm |
| Daylight | 13.8 h | 12.9 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 August day
- 6 am68°Fdew point 62°F
- 9 am72°Fdew point 63°F
- Noon75°Fdew point 63°F
- 3 pm75°Fdew point 62°F
- 6 pm72°Fdew point 62°F
- 9 pm70°Fdew point 63°F
NOAA hourly normals (local standard time) from San Diego Lindbergh Fld (14 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F2 of 31
- Hot dayshigh 90°F or more15 of 31
- Muggy daysdaily mean dew point 65°F or more7 of 31
- Wet daysat least 0.01 in of rain or melted snow0 of 31
- Notable rainat least 0.10 in0 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 0.03 in; a dry August brings about 0.0 in and a wet one about 0.01 in (25th and 75th percentiles). Days with half an inch or more are rare.
How August varies from year to year
- Warmest August, 1991-20202003: average high 93°F
- Coolest August1991: average high 85°F
- Wettest August2014: 0.3 in
- Driest August1993: no measurable precipitation
- Highest reading107°F (August 29, 2009)
- Lowest reading50°F (August 6, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 86°F | 89°F | 87°F |
| Normal low | 63°F | 65°F | 62°F |
| Wet days | 1 | 0 | 1 |
| Comfortable days | 4 | 2 | 4 |
| Daylight | 14.1 h | 13.3 h | 12.4 h |
Highs change by +3°F from July and -2°F into September.
Nearby alternatives in August
- Warmer: Temecula, CA49 mi · high 98°F · 1 wet day
- Cooler: San Diego, CA13 mi · high 77°F · 0 wet days
How El Cajon ranks in August
- Normal high157th warmest of 378 cities; 30th of 60 in California
- Wet days38th driest of 378
- Comfortable days180th most of 341
What to pack for El Cajon in August
- Light, breathable clothing – highs near 89°F and about 7 muggy days
Heating and cooling
August has 0 heating degree days and 361 cooling degree days (base 65°F), 13% of the year's total heating and cooling demand.
Questions
How hot is El Cajon in August?
The normal high is 89°F and the normal low is 65°F. From 1991 to 2020 the hottest August reading was 107°F (most recently on August 29, 2009).
Does it rain a lot in El Cajon in August?
About 0 days in August have at least 0.01 in of precipitation, and the normal total is 0.03 in. The wettest August in 1991-2020 was in 2014 (0.3 in); the driest was in 1993, with no measurable precipitation.
Is August a good time to visit El Cajon?
August ranks 11th of 12 months on our comfort score for El Cajon (49 out of 100). It has about 2 comfortable days and about 15 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).