San Francisco Weather in January
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Updated: March 2026
Is January a Good Time to Visit San Francisco?
January is a fair time to visit San Francisco (4/10). With 7 daily sunshine hours and only 10 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 11th sunniest of the year in San Francisco. January suits travellers visiting for indoor culture, food, and architecture rather than outdoor activities. Pack accordingly for 10 potential rain days. February offers a similar profile at lower hotel rates if dates are flexible. The main practical note: San Francisco's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: most accommodation categories have availability, and last-minute deals are common. The quieter streets and shorter queues can make this a genuinely enjoyable time to visit for the right type of traveller. Budget-conscious visitors will find the best value of the year in this period.
The single most important thing to know about visiting San Francisco in January: conditions are genuinely cooperative, with 14°C highs and only 10 wet days making this one of the more straightforward months to plan around. Precipitation totals 97mm for the month, spread across roughly 10 days, and 7 sunshine hours per day give you a reliable window for outdoor plans.
14°C
Avg High
7°C
Avg Low
10 days
Rain Days
7h
Sunshine
65%
Humidity
Temperature in San Francisco in January
The 7°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. The UV index of 1 is low, meaning sun exposure is minimal concern and sunscreen is largely optional. Wind averages 15 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 57°F average high, 45°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature in January
Monthly Precipitation (mm)
What to Wear in San Francisco in January
Packing for San Francisco in January means dressing for 14°C days and 7°C evenings. A mid-weight jacket over a sweater handles 14°C daytime temperatures; the combination stays comfortable all day without overheating. Evening temperatures settle at 7°C, a modest 7°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. A compact foldable umbrella weighs almost nothing and earns its keep across 10 potential rainy days.
Local tip: Layers are more practical than a single heavy garment in San Francisco. The day-to-evening temperature shift rewards packing a versatile mid-layer you can add or remove as conditions change.
Events in San Francisco in January
January has no major festivals or public holidays in San Francisco, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.
What to Pack for San Francisco in January
Based on 14°C average highs and 10 rainy days
- Warm jacket (down or fleece)
- Merino wool base layer (regulates temperature and resists odour)
- Sweaters and lined trousers
- Scarf and lightweight gloves
- Compact folding umbrella
- Waterproof outer layer or packable rain jacket
- Quick-dry clothing that recovers fast after a shower
- Comfortable walking shoes (a second pair lets the first air out overnight)
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in San Francisco in January
- Explore the old town's cobblestone backstreetsMorning (9-11am)At 14°C, conditions are pleasant for unhurried exploration on foot
- Visit hilltop viewpoints for panoramic city viewsLate afternoon (4-6pm)Low sun angle creates dramatic light for photography while temperatures remain comfortable
- Bicycle rental for a half-day city circuitMid-morning startMild 14°C temperatures are ideal for extended cycling without excessive effort
- Boat tour of the river, bay, or canal networkLate morning departureComfortable weather makes open-deck boats viable without wind-chill concerns
- Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
- Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
- Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningJanuary brings distinct seasonal changes to public green spaces worth exploring
- Warm up with traditional hot dishes: local stew, fondue, or braised specialities at a neighbourhood restaurantLunch (12-2pm) or dinner (7-9pm)Cold-weather cuisine is a genuine cultural experience and the best local restaurants serve their heartiest dishes in cooler months
Why is San Francisco cool in January?
January in San Francisco reflects a mid-latitude climate pattern, with temperatures averaging 14°C by day and 7°C overnight. The city sits at 38 degrees north latitude, where the balance between solar radiation and heat loss drives conditions that are neither extreme nor static. Conditions occupy the comfortable middle band of the annual temperature range, where outdoor activity is feasible without the extremes of midsummer heat or midwinter cold. Day-to-night temperature variation of 7°C is moderate and manageable with a single mid-layer. Climate data: Open-Meteo ERA5 (1991–2020).
Sunshine Hours
The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.
UV Index
A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.
Rain Days
A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.
Humidity
Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.
Frequently Asked Questions: San Francisco in January
January ranks 11th sunniest of the year in San Francisco, with an average 7 daily sunshine hours. The driest months are July, August, and September. September is the hottest month (23°C avg high); January is the coolest (14°C). From here, temperatures rise 1°C into February. Compared to last month (December: 14°C high, 9 rain days), January is similarly warm and wetter. January is one of the least sunny months, but that often means lower prices and fewer fellow tourists.
Year-Round Climate
Plan Your Trip to San Francisco
Data Sources for San Francisco
Climate normals represent 30-year averages (1991-2020). Individual years may vary.