Weather
San Diego Weather
San Diego's weather has a reputation: 70°F and sunny, year-round. That reputation is broadly earned — the city sees one of the mildest, driest, and most stable climates in the United States — but the reality on the ground is more nuanced. Coastal microclimates, seasonal marine layer, occasional Santa Ana winds, and the rare atmospheric river can all change a day's plans.
The page below pairs a live coastal forecast with a written climate guide. If you're visiting, the guide explains the difference between "May Gray" mornings and August clear-sky afternoons, why your hotel in Mission Valley feels 10°F warmer than the beach two miles west, and which months actually deliver the postcard San Diego people expect.
For locals, the live data tracks the variables that actually matter: wind direction (offshore = clean surf, onshore = textured surf), humidity (low humidity + east wind = fire weather), and the all-day visibility forecast (a fog-bound morning is a fog-bound surf session).
Best for
Find your perfect match
Best for outdoor weddings
Top pick: Late September forecastWarm, dry, and almost guaranteed clear skies after Labor Day — the safest outdoor month.
Best for whale watching weather
Top pick: Winter clear-air daysDec–Mar gray-whale season pairs with cool, dry winter air for the clearest offshore visibility.
Best for hiking weather
Top pick: October–May windowCooler, often crisper air — wildflowers in Feb–Mar after winter rain.
Best for sunset photography
Top pick: Fall + winter lightLower sun angle, crisper air, and occasional cloud structure produce the richest sunset colors.
Best for warm ocean swims
Top pick: August → early OctoberWater peaks around 70°F. The 'warm season' is later than people expect.
Best for clear-day surfing
Top pick: Fall offshore morningsOffshore winds give glass-clean faces with warm water through October.
Know before you go
Plan it like a local
Layer for the day, not the morning
A foggy 60°F coastal sunrise can become a 78°F sunny afternoon. Layers (t-shirt, light long sleeve, windbreaker) cover the full day without packing heavy.
Inland is hotter, the coast is cooler
Driving from the beach to East County in July, expect a 15–25°F temperature jump. Plan inland hikes for early morning, coastal walks for afternoon.
Watch the air quality during fires
Wildfire smoke from inland or Northern California can drift to the coast. Check AQI before exercising outdoors during fire season (August–November).
Know the rain timeline
Heavy rain triggers a 72-hour surf advisory due to urban runoff. Plan your beach day for the third sunny day after a storm, not the first.
Sun is strong year-round
San Diego's latitude gives strong UV even on overcast 60°F days. Sunscreen is a year-round habit, not a summer one.
Track Santa Ana days
When the wind reverses to come from the east, expect record warmth at the coast, dry air, calm clean surf, and elevated fire danger inland. They typically last 2–4 days.
FAQ
Frequently asked
- What is the best month to visit San Diego for weather?
- September and October are widely considered the best — warm but not hot (75–80°F), water temperatures at their annual peak (around 70°F), reliably clear skies, and thinner crowds after Labor Day. May and June can be greyer than visitors expect due to the marine layer.
- What is 'May Gray' and 'June Gloom'?
- A persistent low marine layer of clouds that often blankets the coast through morning and sometimes all day in late spring. Caused by warm inland air sitting over cool ocean water. It usually burns off by early afternoon — but not always. Inland areas (15+ miles from the coast) often stay sunny.
- Does it ever rain in San Diego?
- Yes, mostly between November and March. Annual rainfall averages just 10 inches — about a quarter of New York City. Rain comes in concentrated bursts; the city can go six months between meaningful storms. When it does rain, expect surf runoff warnings for 72 hours.
- How hot does San Diego get in summer?
- Coastal areas average 72–78°F highs in July and August, rarely topping 85°F. Inland (El Cajon, Escondido) routinely hits 90–100°F. The famous moderate climate is a coastal phenomenon — drive 20 minutes inland and the temperature can jump 15°F.
- What is a Santa Ana wind?
- Strong, hot, dry winds that flow from the inland deserts toward the coast, usually in fall. They reverse the normal sea breeze, spike fire danger, and can push temperatures to record highs (90°F+ at the beach). They typically last 2–4 days at a time.
- Do I need a jacket in San Diego?
- Yes — even in summer. Evenings cool to the high 50s or low 60s on the coast, and the breeze adds chill. Pack a light layer year-round for sunset walks, restaurant patios, and boat trips. Inland evenings are warmer in summer but colder in winter.