December 28 sees frequent showers in San Francisco. Historical data shows a 40% chance of rain, so pack accordingly. Temperatures average 13°C. As it's peak season for San Francisco, we recommend booking your stay well in advance to secure the best rates.
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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 December 28
"Mild & Comfortable. Expect average highs of 12.9°C. 40% chance of rain."
What to Wear in San Francisco in December
Based on historical data for December 28, San Francisco typically experiences temperatures between 6.8°C and 12.9°C. We recommend packing heavy coat, scarf, gloves along with other layers to stay comfortable. With a 40% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for San Francisco
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
- Umbrella
Average High
12.9°C
Daytime Peak
Average Low
6.8°C
Nighttime Low
Feels Like
12.1°C
🌤️ Feels accurate
Rain Chance
40%
Avg 3.6mm if it rains
Cloud Cover
64%
Overcast
Pressure
1019.4 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 98% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
9.9°C
Dry air
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
87/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~1,892
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in San Francisco
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:25
☀️ Noon
12:12
🌇 Sunset
16:59
⏱️ Daylight
9h 33m
Wind Speed
19.2 km/h
Gentle breeze
Sunshine
5.4 hrs
Direct Sun (Cloud-free)
Humidity
82%
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
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
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 December 28 averages 12.9°C with a 40% precipitation probability. Wedding/Outdoor Event Score: 74/100."
— 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
December 22
13.2°C • 24% rain
Score
84
December 23
13.2°C • 24% rain
Score
84
December 21
13.1°C • 24% rain
Score
83
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 28) in other destinations
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📍 Is San Francisco Worth Visiting on December 28?
Planning a trip to San Francisco on December 28? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 12.9°C with a 40% historical precipitation risk.
✈️ Travel Logistics: Approximately 1,892 landing slots available daily during this period, indicating peak tourist activity.
🌊 Coastal Conditions: Water temperature averages 12.3°C (polar plunge). Wave conditions are generally surfers only with heights around 2.32m.
📊 Historical Extremes: The hottest December 28 recorded in the last 30 years saw temperatures hit 16.3°C in 2023, while the coldest dropped to 1.3°C in 2016.