Climate averages 1991–2020
San Diego weather
in April.
A mild, fairly dry month: the 8th warmest and the 7th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in San Diego: daytime highs average 19.1°C and nights cool to about 11.9°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 16 mm of rain on roughly 3 days, which makes April a fairly dry month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 58 min on an average April day.
The nearest other city in this atlas is Chula Vista (11 km away). In April its highs average 18.4°C, 0.7°C cooler than San Diego, with 23 mm of rain.
Among the 498 cities listed in the United States, San Diego ranks joint 266th of 498 for the warmest April highs and joint 29th of 498 for the driest April (rainfall, lowest first). The mean April high of those 498 cities is 19.4°C; San Diego is 0.2°C cooler than that mean.
From April to May, average highs rise by 1.0°C to 20.2°C, and monthly rainfall falls from 16 mm to 7.1 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
San Diego climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.4°C8.7°C | 8.7°C | 50 | 5.5 | 10.310 h |
| February | 17.2°C9.2°C | 9.2°C | 63 | 6.1 | 11.011 h |
| March | 17.8°C10.4°C | 10.4°C | 38 | 5.2 | 12.012 h |
| April, selected | 19.1°C11.9°C | 11.9°C | 16 | 2.9 | 13.013 h |
| May | 20.2°C13.6°C | 13.6°C | 7.1 | 1.6 | 13.814 h |
| June | 22.0°C14.9°C | 14.9°C | 1.2 | 0.2 | 14.314 h |
| July | 24.3°C17.1°C | 17.1°C | 1.3 | 0.3 | 14.114 h |
| August | 25.4°C18.0°C | 18.0°C | 0.4 | 0.1 | 13.413 h |
| September | 25.1°C17.5°C | 17.5°C | 2.9 | 0.6 | 12.412 h |
| October | 23.0°C15.2°C | 15.2°C | 12 | 2.0 | 11.411 h |
| November | 20.3°C11.7°C | 11.7°C | 19 | 2.9 | 10.511 h |
| December | 17.3°C8.8°C | 8.8°C | 40 | 4.9 | 10.010 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Chula Vista in AprilUnited States · 11 kmHigh 18.4°C · Low 11.9°C · 23 mm rain
- El Cajon in AprilUnited States · 21 kmHigh 20.2°C · Low 10.9°C · 23 mm rain
- Tijuana in AprilMexico · 28 kmHigh 18.2°C · Low 11.6°C · 25 mm rain
- Rosarito in AprilMexico · 41 kmHigh 18.5°C · Low 12.3°C · 18 mm rain
- Escondido in AprilUnited States · 45 kmHigh 20.5°C · Low 10.0°C · 31 mm rain
- San Marcos in AprilUnited States · 48 kmHigh 19.1°C · Low 10.3°C · 28 mm rain
- Vista in AprilUnited States · 54 kmHigh 20.3°C · Low 10.6°C · 28 mm rain
- Oceanside in AprilUnited States · 57 kmHigh 18.6°C · Low 11.8°C · 17 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for San Diego) is explained once on the San Diego year overview and on the Sources, method and limits page.