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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Coast Pulse Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
San Diego enjoys a mild Mediterranean climate with average highs of 21°C in winter and 25°C in summer, making it a year-round destination. The live forecast above shows current conditions; for planning, the best travel windows are April–June and September–November when crowds thin and hotel rates drop.
What is the best time to visit San Diego for good weather?
May and October offer the sweet spot: temperatures sit around 20–24°C, skies are clear, and school holidays haven’t peaked. July and August are warmest (25–27°C) but bring higher accommodation costs and more crowds. Winter (December–February) stays mild at 18–21°C, ideal for a winter escape if you pack a light jacket for cooler evenings. For those checking san diego weather by month, June often has morning marine layer (“May grey” lingers into “June gloom”), but it usually burns off by midday.
What should I pack for San Diego?
Layers are key: a light sweater or windbreaker for coastal breezes, plus shorts and T-shirts for daytime. Sun protection is essential year-round. If you’re watching weather in san diego 10 days or weather in san diego 14 days forecasts, note that sea breezes can drop temperatures 5–8°C from inland readings. The san diego weather radar rarely shows heavy rain, but a compact umbrella is handy from November to March.
Does San Diego get very hot in summer?
Not usually. Sea breezes keep coastal areas around 25°C. Inland suburbs like El Cajon can reach 32°C, but the coast stays comfortable. Check san diego weather hourly for beach-planning; afternoons are warmest.
What is the weather in San Diego tomorrow likely to be?
For weather in san diego tomorrow, expect a morning marine layer (clouds) clearing to sunshine by late morning. Highs typically reach 20–23°C. The san diego weather 15 day outlook is reliable for trend, not exact temperatures.
Is San Diego weather measured in Celsius?
Yes, san diego weather in celsius is standard for Australian travellers. The US uses Fahrenheit, but all forecasts on Coast Pulse are converted to Celsius for clarity. Summer feels like a Perth or Adelaide summer, but with less humidity.
Sources
Compare San Diego’s climate with California Weather or plan a West Coast trip via Seattle Weather. For broader Australian travel conditions, see the Australia weather hub.