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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Regional Report weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
San Diego enjoys a mild Mediterranean climate with dry, warm summers and cooler, wetter winters. The live forecast above shows the current conditions, with daytime highs typically ranging from 18°C to 26°C depending on the season.
What is the weather in San Diego like year-round?
San Diego’s coastal location keeps temperatures moderate throughout the year, with very few extremes. Summer highs average around 24°C, while winter afternoons often reach 18°C. Rainfall is light and concentrated between November and March.
- Summer (June–September): mostly sunny, low humidity, sea breezes keep the coast cool. Highs typically 22–26°C.
- Winter (December–February): mild and occasionally rainy. Daytime highs near 18°C, nights around 10°C.
- Spring and autumn are transitional: warm afternoons, cooler evenings, and low chance of rain — ideal for outdoor plans.
- The ocean influence means fog or low cloud can develop overnight, often burning off by late morning.
Will I need a jacket in San Diego in the evening?
Yes, especially outside summer. The coastal breeze and a drop of 8–10°C after sunset make a light jacket or sweater useful for most of the year. Even in July and August, evenings can feel cool near the water.
Visitors checking the weather in San Diego for 10 days or a 14-day outlook should note that overnight lows range from about 10°C in winter to 18°C in summer. If you’re used to Celsius, expect those figures; if you prefer Fahrenheit, summer highs sit around 75–80°F.
Can I check the forecast hour by hour?
Yes. The San Diego weather hourly breakdown is available in the live forecast above, showing temperature, wind, and chance of rain for each part of the day. This is especially helpful for planning beach trips or early morning hikes.
For a broader view, the 10 Day Weather Forecast UK offers similar detail for British locations, while our UK weather hub covers conditions across the country. For San Diego itself, a 15-day outlook gives a useful sense of coming trends, though confidence reduces after day seven.
What is the best month to visit San Diego for warm weather?
August and September are typically the warmest and sunniest months, with average highs around 26°C and very little rain. The ocean temperature is also at its peak, making it ideal for swimming or surfing.
Does San Diego ever get cold?
Rarely by UK standards. Even in January, daytime highs average 18°C and frost is almost unheard of. The coolest nights drop to around 8°C, so a fleece or light jacket is enough for winter evenings.
How accurate are 14-day forecasts for San Diego?
General trends — such as whether it will be warm or cooler than average — are fairly reliable at that range. Specific daily highs or rain timing become less accurate beyond seven days. The live forecast above updates daily for the best available data.