Climate averages 1991–2020
San Diego weather
in July.
A warm, very dry month: the 3rd warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
July is a warm month in San Diego: daytime highs average 24.3°C and nights cool to about 17.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 1.3 mm of rain on fewer than one day, which makes July a very dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 05 min on an average July day.
The nearest other city in this atlas is Chula Vista (11 km away). In July its highs average 23.5°C, 0.9°C cooler than San Diego, with 2.6 mm of rain.
Among the 498 cities listed in the United States, San Diego ranks 479th of 498 for the warmest July highs and joint 42nd of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; San Diego is 6.0°C cooler than that mean.
From July to August, average highs rise by 1.1°C to 25.4°C, and monthly rainfall falls from 1.3 mm to under 1 mm.
The annual picture
July 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 | 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, selected | 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
July in nearby cities
- Chula Vista in JulyUnited States · 11 kmHigh 23.5°C · Low 17.2°C · 2.6 mm rain
- El Cajon in JulyUnited States · 21 kmHigh 27.2°C · Low 17.7°C · 2.6 mm rain
- Tijuana in JulyMexico · 28 kmHigh 23.8°C · Low 17.7°C · 2.0 mm rain
- Rosarito in JulyMexico · 41 kmHigh 23.9°C · Low 18.3°C · 1.1 mm rain
- Escondido in JulyUnited States · 45 kmHigh 28.0°C · Low 17.8°C · 3.7 mm rain
- San Marcos in JulyUnited States · 48 kmHigh 25.8°C · Low 17.2°C · 2.0 mm rain
- Vista in JulyUnited States · 54 kmHigh 27.7°C · Low 18.3°C · 2.0 mm rain
- Oceanside in JulyUnited States · 57 kmHigh 24.7°C · Low 18.1°C · 1.2 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.