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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the PressHive weather desk. Data from national met services via Open-Meteo.
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San Diego enjoys a mild Mediterranean climate with sunshine reigning for most of the year; the live forecast above shows today’s conditions, and average highs range from 18°C in January to 26°C in August, making it one of the US’s most consistently pleasant cities for coastal weather.
What is the weather in San Diego like across the year?
San Diego weather by month stays remarkably stable, with daytime temperatures rarely straying far from 20°C. Winters are mild and wetter, while summers are dry and warm, though the Pacific Ocean keeps the coast cooler than inland valleys. For those checking san diego weather in celsius, the typical summer high sits around 25°C, and winter lows hover near 10°C. This year-round comfort is a big draw for visitors from the UK, where conditions are less predictable.
How accurate are the longer-range forecasts for San Diego?
Looking at weather in san diego 14 days ahead gives a reliable trend, but day-to-day detail is best checked a few days out. San Diego’s coastal microclimate means morning clouds can burn off to clear afternoons; hourly shifts are well captured by the san diego weather hourly data in the live forecast above. For planning, the san diego weather 15 day outlook is useful for spotting any rare rain or heat spikes, though confidence drops beyond ten days.
Does San Diego ever get cold enough for snow?
Snow is extremely rare in San Diego itself; the city sits on the coast with mild winters. Snowfall only occurs in the region at higher elevations like Mount Laguna, east of the city, which can see a dusting a few times a year.
What is the best month to visit San Diego for good weather?
September and October are often ideal, with summer warmth still lingering but fewer crowds at the coast. The ocean temperature also peaks in September, making beach days very comfortable without the July-August fog risk.
Is the San Diego weather forecast given in Fahrenheit or Celsius?
The live forecast above uses both scales; locally, san diego weather fahrenheit is common on US services, but international visitors can easily convert. Our sister page on /weather/10-day-forecast/ provides UK-friendly Celsius readings for comparison.
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Curious how this compares to Britain’s climate? Visit our UK weather hub for the latest on Birmingham Weather or Glasgow Weather to see the contrast. For a detailed outlook, check the 10 Day Weather Forecast UK.