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El Cajon, CA Weather on May 15
May 15th in El Cajon, CA typically brings pleasant spring weather, with average highs around 76°F and lows near 57°F. Over 55 years of records, the warmest May 15th was in 2014 (81°F average), while the coldest was 1989 (57°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 2% of May 15th dates historically, with the wettest May 15th recording 1.3" of rain. The last decade has been 3.3°F cooler on this date compared to 20-30 years ago.
What to Expect on May 15
Planning for May 15th in El Cajon, CA? Great weather for outdoor activities.
May 15 Weather Records for El Cajon
- •The all-time record high for May 15th in El Cajon, CA is 104°F, set in 2014.
- •The coldest May 15th on record dropped to 47°F in 1998.
- •Temperatures have reached 90°F or higher on May 15th in 3 of the last 55 years.
Frequently Asked Questions
What was the warmest May 15 ever in El Cajon?
The warmest May 15 in El Cajon, CA reached 104°F in 2014. That is 28°F above the long-term average high of 76°F.
What was the coldest May 15 ever in El Cajon?
The coldest May 15 in El Cajon, CA dropped to 47°F in 1998. That is 10°F below the long-term average low of 57°F.
What is the average temperature on May 15 in El Cajon?
On May 15, El Cajon averages a high of 76°F and a low of 57°F based on 55 years of NOAA weather observations from GILLESPIE FLD.
How many years of weather data are available for May 15 in El Cajon?
We have 55 years of weather records for May 15 in El Cajon, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
May 15 Weather History in El Cajon
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 73°F | 55°F | 0" | -- |
| 2024 | 68°F | 57°F | 0" | -- |
| 2023 | 77°F | 60°F | 0" | -- |
| 2022 | 85°F | 56°F | 0" | -- |
| 2021 | 70°F | 59°F | 0" | -- |
| 2020 | 77°F | 60°F | 0" | -- |
| 2019 | 70°F | 61°F | 0" | -- |
| 2018 | 74°F | 59°F | 0" | -- |
| 2017 | 63°F | 54°F | 0" | -- |
| 2016 | 70°F | 59°F | 0" | -- |
| 2015 | 64°F | 54°F | 1.3" | -- |
| 2014 | 104°F | 58°F | 0" | -- |
| 2013 | 75°F | 59°F | 0" | -- |
| 2012 | 81°F | 53°F | 0" | -- |
| 2011 | 66°F | 55°F | 0" | -- |
| 2010 | 79°F | 57°F | 0" | -- |
| 2009 | 78°F | 57°F | 0" | -- |
| 2008 | 89°F | 56°F | 0" | -- |
| 2007 | 66°F | 56°F | -- | -- |
| 2006 | 78°F | 58°F | 0" | -- |
| 2005 | 89°F | 56°F | 0" | -- |
| 2004 | 82°F | 57°F | 0" | -- |
| 2003 | 75°F | 50°F | 0" | -- |
| 2002 | 69°F | 58°F | 0" | -- |
| 2001 | 80°F | 74°F | 0" | -- |
| 2000 | 81°F | 52°F | 0" | -- |
| 1999 | 68°F | 55°F | 0" | -- |
| 1998 | 76°F | 47°F | 0" | -- |
| 1997 | 97°F | 57°F | 0" | -- |
| 1996 | 86°F | 62°F | 0" | -- |
| 1995 | 70°F | 51°F | 0" | -- |
| 1994 | 64°F | 59°F | 0" | -- |
| 1993 | 85°F | 60°F | 0" | -- |
| 1992 | 78°F | 63°F | 0" | -- |
| 1991 | 78°F | 50°F | 0" | -- |
| 1990 | 71°F | 57°F | 0" | -- |
| 1989 | 60°F | 54°F | 0" | -- |
| 1988 | 79°F | 53°F | 0" | -- |
| 1987 | 71°F | 59°F | 0" | -- |
| 1986 | 71°F | 58°F | 0" | -- |
| 1985 | 76°F | 53°F | 0" | -- |
| 1984 | 71°F | 56°F | 0" | -- |
| 1983 | 81°F | 54°F | 0" | -- |
| 1982 | 79°F | 56°F | -- | -- |
| 1981 | 69°F | 58°F | 0" | -- |
| 1980 | 68°F | 54°F | 0" | -- |
| 1979 | 69°F | 57°F | 0" | -- |
| 1978 | 82°F | 56°F | 0" | -- |
| 1977 | 65°F | 56°F | 0" | -- |
| 1976 | 79°F | 55°F | 0" | -- |
| 1975 | 72°F | 56°F | 0" | -- |
| 1974 | 68°F | 56°F | 0" | -- |
| 1973 | 78°F | 57°F | 0" | -- |
| 1972 | 90°F | 57°F | 0" | -- |
| 1971 | 72°F | 55°F | 0" | -- |
Based on 55 years of data from NOAA station: GILLESPIE FLD
Monthly Climate Averages
Historical temperature and precipitation averages for El Cajon, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.