El Cajon weather in August: El Cajon, California: normal highs, lows, rain and records for August
El Cajon in August has a normal high of 89°F and a normal low of 65°F, a daily mean of 77°F, rising from 87°F on the 1st to 89°F by the 31st. Measurable precipitation falls on 0 days in a normal August, 0.02 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 18°C, 1 mm of precipitation in August.
- 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 August?
The normal high is 89°F and the normal low 65°F, for a daily mean of 76.6°F. August is 1.9°F warmer than July and 1.9°F warmer than September. August is the warmest month of the year in El Cajon and the 12th wettest. Across the month the normal high rises 2°F, from 87°F on August 1 to 89°F on August 31. From one year to the next August's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 75°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 2%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 87°F | 65°F | 2% | 1% |
| August 8 | 88°F | 65°F | 1% | 1% |
| August 15 | 89°F | 65°F | 1% | 1% |
| August 22 | 89°F | 65°F | 1% | 0% |
| August 31 | 89°F | 64°F | 1% | 1% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 29, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 87°F | 65°F | 2% | 1% | 13 h 50 min |
| August 2 | 88°F | 65°F | 2% | 1% | 13 h 50 min |
| August 3 | 88°F | 65°F | 2% | 1% | 13 h 40 min |
| August 4 | 88°F | 65°F | 2% | 1% | 13 h 40 min |
| August 5 | 88°F | 65°F | 2% | 1% | 13 h 40 min |
| August 6 | 88°F | 65°F | 2% | 1% | 13 h 40 min |
| August 7 | 88°F | 65°F | 1% | 1% | 13 h 40 min |
| August 8 | 88°F | 65°F | 1% | 1% | 13 h 40 min |
| August 9 | 88°F | 65°F | 1% | 1% | 13 h 30 min |
| August 10 | 88°F | 65°F | 1% | 1% | 13 h 30 min |
| August 11 | 88°F | 65°F | 1% | 1% | 13 h 30 min |
| August 12 | 88°F | 65°F | 1% | 1% | 13 h 30 min |
| August 13 | 88°F | 65°F | 1% | 1% | 13 h 30 min |
| August 14 | 89°F | 65°F | 1% | 1% | 13 h 30 min |
| August 15 | 89°F | 65°F | 1% | 1% | 13 h 20 min |
| August 16 | 89°F | 65°F | 1% | 1% | 13 h 20 min |
| August 17 | 89°F | 65°F | 1% | 0% | 13 h 20 min |
| August 18 | 89°F | 65°F | 1% | 0% | 13 h 20 min |
| August 19 | 89°F | 65°F | 1% | 0% | 13 h 20 min |
| August 20 | 89°F | 65°F | 1% | 0% | 13 h 20 min |
| August 21 | 89°F | 65°F | 1% | 0% | 13 h 10 min |
| August 22 | 89°F | 65°F | 1% | 0% | 13 h 10 min |
| August 23 | 89°F | 65°F | 1% | 0% | 13 h 10 min |
| August 24 | 89°F | 65°F | 1% | 0% | 13 h 10 min |
| August 25 | 89°F | 65°F | 1% | 0% | 13 h 10 min |
| August 26 | 89°F | 64°F | 1% | 0% | 13 h |
| August 27 | 89°F | 64°F | 1% | 1% | 13 h |
| August 28 | 89°F | 64°F | 1% | 1% | 13 h |
| August 29 | 90°F | 64°F | 1% | 1% | 13 h |
| August 30 | 90°F | 64°F | 1% | 1% | 13 h |
| August 31 | 89°F | 64°F | 1% | 1% | 12 h 50 min |
- Normal high
- 89°FAugust average
- Normal low
- 65°FAugust average
- Precipitation
- 0.02 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Days at 90°F or more
- 15
- Daylight
- 13 h 50 min to 12 h 50 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 30
- Sunshine
- 94%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 August?
On a given August day the chance of 0.01 inch or more is 1% on average, highest around August 1 (2%). In all, 0.02 in falls on 0 days of a normal August.
In a normal August in El Cajon, 15 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00042706.
What are the records for August in El Cajon?
The warmest August temperature on El Cajon's official record (since 1899) is 111°F, on August 31, 1955; the coldest is 44°F, on August 27, 1928. The wettest August brought 1.92 in (1951).
The August mean against the 1991-2020 normal of 76.6°F: 2021 77.6°F (+1.0), 2022 78.3°F (+1.7), 2023 76.5°F (−0.1), 2024 76.5°F (−0.1), 2025 76.0°F (−0.5), 2026 80.2°F (+3.6). 3 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.6°F | +1.0°F | 0.00 in |
| 2022 | 78.3°F | +1.7°F | 0.02 in |
| 2023 | 76.5°F | −0.1°F | 1.89 in |
| 2024 | 76.5°F | −0.1°F | 0.05 in |
| 2025 | 76.0°F | −0.5°F | 0.08 in |
| 2026 | 80.2°F | +3.6°F | 0.00 in |
Source: records: ACIS, NWS threaded record ELJC1thr; recent months: ACIS, station USC00042706. Records and recent months use complete months only.
How does August in El Cajon compare across California?
Across the 219 places PlainClimate covers in California, August normal highs run from 63°F in Bodega to 109°F in Needles; El Cajon's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.