Foster City Weather in January
Foster City in January sees moderate temperatures, with highs around 15°C (59°F) and overnight lows of 6°C (43°F). Rainfall is fairly high at around 61 mm (2.4 in) on average, so pack waterproofs just in case.
Rainfall in Foster City in January
Rain is expected on roughly 9 days, totalling around 61 mm (2.4 in) for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Foster City in January
In January, Foster City gets moderate temperatures, with highs of 15°C (59°F). Nights cool to around 6°C (43°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 6°C (43°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Foster City in January
The area enjoys a balanced 186 hours of sunlight, ensuring it's neither too overcast nor too sunny.
Wind Speed in Foster City in January
Average wind speeds reach 3 m/s (6 knots) in January, creating light breezes that feel pleasant throughout the day. Some days are calmer, while others bring slightly more active breezes.
Average water temperature in January
At 12°C (54°F), the water is very cold. Most people find it too uncomfortable for anything beyond a brief wade.If you're looking for dry conditions and comfortable temperatures, January may not be the ideal month to visit Foster City. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Foster City's climate page.
Foster City Temperature in January
Min Temperature
6°C (43°F)
Max Temperature
15°C (59°F)
Water Temperature
12°C (54°F) *
Chance of Rain
30%
Precipitation
61 mm (2.4 in)
Rainy days
9 days
Humidity
80% *
Windspeed
3 m/s (6 knots) *
Sunshine
186 hours *
Percentage Sunshine
61% *
Best Places in the United States of America in January
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in January →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Foster City 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. Expect water temperatures of around 12°C (54°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Foster City in January
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Foster City's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Foster City climate overview or explore weather in the United States of America.
