Climate averages 1991–2020
San Diego weather
in March.
A mild, fairly dry month: the 9th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a mild month in San Diego: daytime highs average 17.8°C and nights cool to about 10.4°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 38 mm of rain on roughly 5 days, which makes March a fairly dry month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 57 min on an average March day.
The nearest other city in this atlas is Chula Vista (11 km away). In March its highs average 17.3°C, 0.5°C cooler than San Diego, with 48 mm of rain.
Among the 498 cities listed in the United States, San Diego ranks joint 197th of 498 for the warmest March highs and joint 48th of 498 for the driest March (rainfall, lowest first). The mean March high of those 498 cities is 14.9°C; San Diego is 2.9°C warmer than that mean.
From March to April, average highs rise by 1.3°C to 19.1°C, and monthly rainfall falls from 38 mm to 16 mm.
The annual picture
March 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, selected | 17.8°C10.4°C | 10.4°C | 38 | 5.2 | 12.012 h |
| April | 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
March in nearby cities
- Chula Vista in MarchUnited States · 11 kmHigh 17.3°C · Low 10.6°C · 48 mm rain
- El Cajon in MarchUnited States · 21 kmHigh 18.6°C · Low 9.4°C · 48 mm rain
- Tijuana in MarchMexico · 28 kmHigh 17.1°C · Low 10.3°C · 53 mm rain
- Rosarito in MarchMexico · 41 kmHigh 17.4°C · Low 11.0°C · 43 mm rain
- Escondido in MarchUnited States · 45 kmHigh 18.7°C · Low 8.1°C · 64 mm rain
- San Marcos in MarchUnited States · 48 kmHigh 17.6°C · Low 8.5°C · 57 mm rain
- Vista in MarchUnited States · 54 kmHigh 18.7°C · Low 8.9°C · 57 mm rain
- Oceanside in MarchUnited States · 57 kmHigh 17.4°C · Low 10.3°C · 40 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.