San Diego in Summer — Weather & What to Expect
Summer in San Diego (June, July, August) averages daytime highs of 23.9°C and lows of 17.7°C, with around 20.8mm of rain across the season (2 rainy days in total). It includes some of the best months of the year to visit (June, July, August).
In the northern hemisphere, summer in San Diego covers June, July, August.
Summer in San Diego month by month
| Month | High | Low | Rain | Rainy days | Rating |
|---|---|---|---|---|---|
| June | 22.1°C | 16.0°C | 3.5mm | 1 | 10/10 |
| July | 24.1°C | 18.1°C | 6.1mm | 0 | 10/10 |
| August | 25.5°C | 19.1°C | 11.2mm | 1 | 10/10 |
What to pack for San Diego in summer
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
Frequently Asked Questions
Is summer a good time to visit San Diego?
Summer in San Diego rates around 10/10 — excellent time to visit. Average highs are 23.9°C with 20.8mm of rain across the season.
How hot is San Diego in summer?
Daytime highs average 23.9°C (75.0°F) across June, July, August, with nights around 17.7°C.
What months are summer in San Diego?
San Diego is in the northern hemisphere, so summer covers June, July, August.
See also: best time to visit San Diego · San Diego annual climate · San Diego in spring · San Diego in autumn · San Diego in winter
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Once you know what summer in San Diego looks like, find out exactly what to pack for San Diego at 247PackingList. For currency, language and country facts, see the United States guide at 247CountryInfo.
Summer in San Diego — what to pack
Hot-weather travel clothing
Sun protection, lightweight layers and a reusable water bottle are essential here.
Check Price →Check clothing sizes in United States at 247Sizing before you shop.
More summer travel essentials
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.