November 21 is generally a great time to visit San Francisco. While there is a slight chance of rain (20%), showers are usually brief. Expect comfortable 16°C weather. Expect a bustling atmosphere in San Francisco right now—this is when the city truly comes alive with visitors.
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Essential Travel Info for San Francisco
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
Thearea codesfor San Francisco are 415 a...
Safety
Moderate Safety
GPI: 2.44
San Francisco Weather Forecast for November 21
"Mild & Comfortable. Expect average highs of 15.6°C. 20% chance of rain."
What to Wear in San Francisco in November
Based on historical data for November 21, San Francisco typically experiences temperatures between 8.9°C and 15.6°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (20% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for San Francisco
Smart Suitcase
- Light Jacket
- Long Pants
Average High
15.6°C
Daytime Peak
Average Low
8.9°C
Nighttime Low
Feels Like
15.6°C
🌤️ Feels accurate
Rain Chance
20%
Avg 1.5mm if it rains
Cloud Cover
52%
Overcast
Pressure
1018.9 hPa
Medium volatility
San Francisco Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 96% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 200 min to burn
Type III-IV
🟡 300 min to burn
Type V-VI
🟢 500 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
12°C
Pleasant
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
High
80/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~1,736
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in San Francisco
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:57
☀️ Noon
11:57
🌇 Sunset
16:56
⏱️ Daylight
9h 58m
Wind Speed
17.7 km/h
Gentle breeze
Sunshine
7.4 hrs
Direct Sun (Cloud-free)
Humidity
79%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for San Francisco
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in San Francisco
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟢 Moderate
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
Eastern Pacific Hurricane Risk
Season: May - Nov
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, San Francisco on November 21 averages 15.6°C with a 20% precipitation probability. Wedding/Outdoor Event Score: 87/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
San Francisco Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
November 25
14.8°C • 14% rain
Score
100
November 24
15°C • 16% rain
Score
96
November 26
14.6°C • 17% rain
Score
93
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (November 21) in other destinations
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📍 Is San Francisco Worth Visiting on November 21?
Planning a trip to San Francisco on November 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 15.6°C with a 20% historical precipitation risk.
✈️ Travel Logistics: Approximately 1,736 landing slots available daily during this period, indicating peak tourist activity.
🌊 Coastal Conditions: Water temperature averages 13.4°C (polar plunge). Wave conditions are generally surfers only with heights around 1.48m.
📊 Historical Extremes: The hottest November 21 recorded in the last 30 years saw temperatures hit 19°C in 2017, while the coldest dropped to 6.7°C in 2020.