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.