San Bruno Weather in January

January in San Bruno averages 14°C (57°F) during the day and 7°C (45°F) at night. Quite a bit of rainfall is typical this month, with around 72 mm (2.8 in) on average. An umbrella is a good idea.

Rainfall in San Bruno in January

Historically, the month has about 9 days of rain, averaging 72 mm (2.8 in) in total. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in San Bruno in January

January in San Bruno brings moderate temperatures, with highs of 14°C (57°F) and nights around 7°C (45°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With lows around 7°C (45°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.

Sunshine in San Bruno in January

The city usually sees around 186 hours of sunlight, indicating a moderately sunny period.

Wind Speed in San Bruno in January

January has wind speeds averaging 3 m/s (6 knots). You can expect comfortable light winds that steadily move flags and feel mild throughout the day. Since this is an average, daily conditions vary from gentle winds to more active breezes.

Average water temperature in January

The water temperature is only 12°C (54°F) this month — cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.

If you prefer enjoying temperate temperatures and rain-free days, May, June, July, August, September and October typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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• January
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For a detailed overview over the year and the best time to visit the United States of America, check out our San Bruno's climate page.

San Bruno Temperature in January

Min Temperature 7°C (45°F)  

Max Temperature 14°C (57°F)  

Water Temperature 12°C (54°F) *  

Chance of Rain 30%  

Precipitation 72 mm (2.8 in)  

Rainy days 9 days  

Humidity 80% *  

Windspeed 3 m/s (6 knots) *  

Sunshine 186 hours *  

Percentage Sunshine 61% *  

* Data from: San Francisco, the United States of America (2 KM, 1 Miles).

What to Wear in San Bruno in January

The weather can swing between comfortable and chilly in January, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Wet weather is likely, so pack waterproof gear for multiple rainy days. The water temperature sits at about 12°C (54°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in San Bruno in January

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our San Bruno's climate page.

More climate data for San Bruno

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full San Bruno climate overview or explore weather in the United States of America.