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San Francisco Climate Overview
San Francisco has a unique Mediterranean climate shaped by the cold Pacific Ocean and famous summer fog. Unlike most U.S. cities, SF’s warmest months are September and October – not July and August. The city is known for its microclimates: you can experience fog, sun, and wind all in one day just by moving a few blocks.
Year-round temperatures stay remarkably mild, typically ranging from 10-22°C (50-72°F). There’s no snow, no extreme heat, and no real winter – just layers and a willingness to embrace the fog.
Seasonal Snapshot
- 🌫️ Summer (Jun-Aug): Famous for fog – “June Gloom” and “No Sky July.” Mornings are gray, afternoons may clear. Temperatures hover around 15-21°C (59-70°F). Pack layers.
- ☀️ Fall (Sep-Oct): SF’s true summer. Warmest, sunniest months with clear skies and temperatures reaching 22-24°C (72-75°F). Perfect for outdoor exploring.
- 🌧️ Winter (Nov-Feb): Rainy season. Mild temperatures (10-15°C / 50-59°F) with occasional storms. Least crowded, best hotel deals, green hills after rains.
- 🌸 Spring (Mar-May): Transition season. Rain tapers off, days lengthen. Wildflowers bloom, hills turn gold by May. Temperatures climb slowly toward summer.
Explore San Francisco in Depth
Choose a topic below to dive deeper into everything San Francisco has to offer:
- San Francisco Weather by Month – Complete month-by-month breakdown with temperatures, rainfall, fog patterns, and what to pack for each month.
- Best Time to Visit San Francisco – Find the ideal time for weather, budget, crowds, photography, wine country, and more.
- San Francisco Events & Festivals – Calendar of SF’s best cultural celebrations, food festivals, and seasonal events.
- SF Microclimates & What to Pack – Master SF’s fog zones, sun zones, and exactly what layers to bring for every neighborhood and season.
- Where to Stay in San Francisco – Best neighborhoods from Union Square to the Mission. Compare areas for every travel style and budget.
- Getting Around San Francisco – Walking, Muni, BART, biking, and driving tips for SF’s hills and microclimates.
- SF Travel Tips & FAQ – Insider advice, money-saving strategies, safety tips, and answers to common questions.
Quick Facts
- 🌡️ Warmest months: September and October (avg high 22°C / 72°F)
- ❄️ Coolest month: January (avg high 14°C / 57°F)
- 🌧️ Rainiest months: December through February
- 🌫️ Foggiest months: June through August (“Fogust”)
- 🏊 Ocean temperature: 12-15°C (54-59°F) year-round – wetsuit recommended
- 🗻 Microclimates: Up to 10°C (18°F) difference between neighborhoods on the same day
City Articles
Best Time to Visit San Francisco
San Francisco does not follow the typical four-season calendar. September and October often bring the city’s warmest, sunniest weather, while summer can mean weeks of grey fog when inland California is baking. This guide breaks down the best time to visit San Francisco by weather, crowds, budget, and the type of experience you want , […]
Read MoreGetting Around San Francisco
San Francisco is one of America’s most walkable cities, but its legendary hills, patchwork transit system, and sprawling Greater Bay Area can make getting around feel complicated at first. From the historic cable cars to the BART trains that connect the East Bay, this guide covers every practical way to navigate San Francisco and its […]
Read MoreSan Francisco Events & Festivals
San Francisco’s event calendar reflects the city’s eclectic spirit , from the massive Pride celebration in June to the quirky traditions of Bay to Breakers and the intellectual draw of the Hardly Strictly Bluegrass festival. This guide covers the best San Francisco events and festivals by season, with practical advice on weather expectations and what […]
Read MoreSan Francisco Microclimates & What to Pack
San Francisco’s weather operates on its own logic. The city’s unique geography , squeezed between the cold Pacific and the warmer bay, with hills creating wind tunnels and fog corridors , means you can experience three seasons in a single afternoon. This guide explains San Francisco’s microclimates in detail and provides a practical packing strategy […]
Read MoreSan Francisco Travel Tips & FAQ
San Francisco surprises first-time visitors who expect endless California sunshine. The city’s notorious microclimates mean you can start the day in fog, eat lunch under blue skies, and need a jacket by dinner , all without leaving city limits. This San Francisco travel tips and FAQ guide covers the practical details that make a trip […]
Read MoreSan Francisco Weather by Month
San Francisco’s weather is defined by its geography: cold ocean currents generate persistent fog, hills create microclimates, and the Mediterranean pattern means wet, mild winters and dry summers that are cooler than most visitors expect. This month-by-month guide breaks down temperatures, rainfall, fog patterns, and what each month actually feels like on the ground so […]
Read MoreWhere to Stay in San Francisco
San Francisco’s neighbourhoods change character , and weather , block by block. The foggy, bohemian Outer Sunset feels a world apart from the sunny, upscale Marina, and both are nothing like the dense urban energy of Downtown and SoMa. This where-to-stay guide breaks down the best San Francisco neighbourhoods and hotels by budget, vibe, and […]
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