Weather in San Diego in August
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Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for August in San Diego.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youAugust in San Diego is warm, with average highs of 25.5°C and lows of 19.1°C. It is very dry, with roughly 11.5 hours of sunshine a day. Weather-wise, this is one of the most reliable months to travel. For the complete picture, see the best time to visit San Diego — every month compared. Once you know when to go, find your San Diego packing list at 247PackingList.
Get ready for San Diego in August
Search flights to San Diego
Compare 100+ airlines for August — one search, best price.
Search Flights →Hot-weather travel clothing
Sun protection, lightweight layers and a reusable water bottle are essential here.
Check Price →What to pack for San Diego in August
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
Compare all months in San Diego
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 17.3°C | 64.6mm | 10/10 |
| February | 18.1°C | 30.5mm | 10/10 |
| March | 17.2°C | 81.3mm | 10/10 |
| April | 19.2°C | 30.3mm | 10/10 |
| May | 20.3°C | 5.3mm | 10/10 |
| June | 22.1°C | 3.5mm | 10/10 |
| July | 24.1°C | 6.1mm | 10/10 |
| August | 25.5°C | 11.2mm | 10/10 |
| September | 25.6°C | 17.5mm | 10/10 |
| October | 23.9°C | 8.8mm | 10/10 |
| November | 21.1°C | 26.8mm | 10/10 |
| December | 17.9°C | 44.4mm | 10/10 |
Full month-by-month guide: best time to visit San Diego →
For facts about United States — currency, language and dialling code — see our United States country guide at 247CountryInfo. Travellers also find it useful to keep a San Diego travel guide to hand. Check clothing sizes in United States before you shop.
Frequently Asked Questions
Is August a good time to visit San Diego?
August rates 10/10 for visiting San Diego — excellent time to visit. Expect average highs of 25.5°C, 11.2mm of rain across the month and about 11.5 hours of daily sunshine.
What is the temperature in San Diego in August?
In August, San Diego has average highs of 25.5°C (77.9°F) and average lows of 19.1°C (66.4°F).
Does it rain in San Diego in August?
Rarely. August is one of the driest times of year in San Diego, averaging only 11.2mm of rain.
What should I wear in San Diego in August?
For San Diego in August (25.5°C highs / 19.1°C lows), pack light layers plus sunscreen, t-shirts and light trousers or shorts.
More essentials for San Diego in August
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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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.