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July in San Francisco typically features cool mornings with fog (known locally as "June Gloom" even in July) burning off to sunny afternoons. Average highs range from 67°F near the coast to 85°F inland, with lows around 55°F. This microclimate creates dramatic weather variations within short distances.
The marine layer will be persistent this month, especially in the first two weeks. Expect morning clouds to clear by noon most days, with temperatures peaking around 3 PM. The fog may linger all day in some western neighborhoods. Winds will typically pick up in the afternoon, especially near the Golden Gate.
By late July, warmer conditions will develop with less morning fog. However, the famous San Francisco summers remain cool compared to most of California. Always carry layers when visiting different neighborhoods, as temperatures can vary by 20°F within city limits.
Health & Activities
The cool marine air makes for excellent outdoor conditions, though the UV index remains high even on foggy days (often 7-8). Morning fog creates poor air quality for sensitive groups until the inversion layer burns off.
Best activities: Hiking in Marin Headlands, cycling across Golden Gate Bridge, or beach walks at low tide. The consistent winds make Crissy Field ideal for kite surfing. Always dress in layers as temperatures fluctuate rapidly.
Hydration remains important despite cooler temperatures. The dry winds can cause dehydration. Ocean temperatures hover around 55°F - wetsuits recommended for swimming.
Travel Conditions
SFO airport experiences minimal weather delays in July, though morning fog may cause occasional visibility issues before 10 AM. The Bay Bridge and Golden Gate rarely close for weather, but high winds sometimes restrict large vehicles.
Cable cars operate normally in all conditions. Ferries to Alcatraz and Sausalito may experience rougher afternoon crossings when winds increase. Coastal Highway 1 may have fog patches reducing visibility.
Public transit (BART, Muni) operates normally. Ride-sharing services are plentiful, though surge pricing occurs during major events. Parking remains challenging in tourist areas regardless of weather.
Disclaimer
AtmoPredict provides weather forecasts for informational purposes only. While we use advanced modeling and real-time data, weather predictions are inherently uncertain. Always consult official sources for critical decisions. By using this service, you agree that AtmoPredict is not liable for any inaccuracies. Data sources include NOAA, NWS, and proprietary models. Forecasts may change without notice. For emergency information, tune to local authorities. Our monthly outlooks represent general trends, not specific event predictions.
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