Spring in San Diego
March – May
Wildflowers, jacarandas, Padres Opening Day and a festival most weekends. Cool water and grey mornings in May are the trade-offs.
San Diego by Season
Weather, crowds, prices and headline events for every season — and a link to each month's guide.
Last updated
Quick answer
For the best all-round trip, come in September or October: the ocean is at its warmest (68–72°F), the summer marine layer is gone, crowds thin out after Labor Day, and hotel rates drop. For the cheapest trip, come in January or February — rates bottom out, whale watching peaks, and daytime highs still sit in the mid-60s. For guaranteed beach weather and every attraction at full hours, come in July or August, but book 90 days out and expect peak pricing. Spring (March–May) is the balanced middle: wildflowers, festivals most weekends, and moderate rates outside spring break and Memorial Day.
Season comparison
| Season | Weather / ocean | Crowds & price | Best for |
|---|---|---|---|
| Spring (Mar–May) | Highs 67–70°F · ocean 60–63°F | Moderate; spikes at spring break | Wildflowers, baseball, festivals |
| Summer (Jun–Aug) | Highs 72–78°F · ocean 65–70°F | Peak crowds, peak rates | Beaches, theme parks, fireworks |
| Fall (Sep–Nov) | Highs 70–76°F · ocean 68–72°F | Thinning crowds, falling rates | Warmest water, air show, Restaurant Week |
| Winter (Dec–Feb) | Highs 64–66°F · ocean 58–59°F | Lowest rates of the year | Whales, museums, holiday lights |
The four seasons
Each season page goes deep on events, weather and what to book ahead.
Summer in San Diego
June – August
Peak season: the county fair, Big Bay Boom fireworks, Del Mar racing, Comic-Con and beaches at their busiest. Book everything early.
Fall in San Diego
September – November
The locals' season. Warmest ocean of the year, clear skies, Fleet Week and the Miramar Air Show, Día de los Muertos, and rates that drop after Labor Day.
Winter in San Diego
December – February
Cheapest months to visit. Gray whale migration, Museum Month discounts, holiday lights in December and mid-60s afternoons throughout.
Every month, in order
Weather, events, crowd levels and what to book for each individual month.
January
Whale season peaks, hotel rates bottom out, Restaurant Week bookings open.
February
Museum Month half-price admission, early wildflowers, warmest February on the West Coast.
March
Spring break, Padres Opening Day, the Ocean Beach Kite Festival.
April
Peak wildflowers and jacarandas; the month locals recommend to first-timers.
May
Cinco de Mayo, Gator by the Bay, and May Gray mornings.
June
County fair opens, Pride takes over Hillcrest, June Gloom until midday.
July
Peak everything: Big Bay Boom, Comic-Con, Del Mar opening day.
August
Warm water, packed beaches, and the last of the summer concert calendar.
September
Warmest ocean of the year, Fleet Week begins, crowds fall away.
October
Miramar Air Show, Halloween events everywhere, perfect weather.
November
Día de los Muertos, quiet Thanksgiving week, high-60s afternoons.
December
December Nights, holiday lights, whale season restarts.
Frequently asked
What is the best month to visit San Diego?
September and October. The ocean is at its warmest of the year, the summer marine layer has cleared, crowds drop after Labor Day, and hotel rates fall with them.
What is the cheapest time to visit San Diego?
January and February. Hotel rates are at their annual low, flights are cheaper, and daytime highs are still in the mid-60s — you just won't be swimming without a wetsuit.
When is the ocean warm enough to swim in San Diego?
Roughly July through October, when water temperatures run 68–72°F. The rest of the year most people wear a wetsuit; winter water sits around 58–59°F.
Does it rain much in San Diego?
Very little, and almost all of it falls between December and March. Even in the wettest months you're looking at a handful of rainy days.
What are May Gray and June Gloom?
A marine layer that keeps coastal mornings overcast in late spring and early summer. It typically clears by early afternoon, and inland areas like Balboa Park and Julian often stay sunny all day.
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