El Cajon, CA weather in May
May in El Cajon: mild and dry. Highs 76°F, lows 56°F, rain on about 3 days. A great month for outdoor plans.
- Normal high
- 76°F
- Normal low
- 56°F
- Wet days
- 3
- 0.4 in total
- Muggy days
- 0
- dew point 65°F+
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 75°F | 78°F |
| Normal low | 53°F | 58°F |
| Chance of a wet day | 11% | 7% |
| Sunrise / sunset | 6:00 am / 7:29 pm | 5:40 am / 7:50 pm |
| Daylight | 13.5 h | 14.2 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 May day
- 6 am61°Fdew point 53°F
- 9 am65°Fdew point 53°F
- Noon67°Fdew point 54°F
- 3 pm67°Fdew point 54°F
- 6 pm65°Fdew point 54°F
- 9 pm63°Fdew point 54°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°F21 of 31
- Hot dayshigh 90°F or more2 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow3 of 31
- Notable rainat least 0.10 in1 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain in May
Normal precipitation is 0.4 in; a dry May brings about 0.0 in and a wet one about 0.6 in (25th and 75th percentiles). Days with half an inch or more are rare.
How May varies from year to year
- Warmest May, 1991-20201997: average high 86°F
- Coolest May2019: average high 70°F
- Wettest May2019: 2.1 in
- Driest May1991: no measurable precipitation
- Highest reading104°F (May 15, 2014)
- Lowest reading43°F (May 10, 2003)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 75°F | 76°F | 81°F |
| Normal low | 51°F | 56°F | 59°F |
| Wet days | 4 | 3 | 1 |
| Comfortable days | 19 | 21 | 14 |
| Daylight | 13.0 h | 13.8 h | 14.3 h |
Highs change by +1°F from April and +5°F into June.
Nearby alternatives in May
- Warmer: Temecula, CA49 mi · high 82°F · 1 wet day
- Cooler: San Diego, CA13 mi · high 70°F · 2 wet days
How El Cajon ranks in May
- Normal high177th warmest of 378 cities; 32nd of 60 in California
- Wet days50th driest of 378
- Comfortable days19th most of 339
Heating and cooling
May has 42 heating degree days and 75 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is El Cajon in May?
The normal high is 76°F and the normal low is 56°F. From 1991 to 2020 the hottest May reading was 104°F (most recently on May 15, 2014).
Does it rain a lot in El Cajon in May?
About 3 days in May have at least 0.01 in of precipitation, and the normal total is 0.4 in. The wettest May in 1991-2020 was in 2019 (2.1 in); the driest was in 1991, with no measurable precipitation.
Is May a good time to visit El Cajon?
May ranks 1st of 12 months on our comfort score for El Cajon (82 out of 100). It has about 21 comfortable days and about 2 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).