Foster City weather
At 4:00 PM local time it was clear and 18°C (64°F). Light rain for 3 of the next 24 hours (under 1 mm/h, 1.0 mm total) — cloudy, but fine to be out. Best months for weather: Jun–Oct. Below: today's sky, the hour-by-hour rain chance and the 16-day forecast for Foster City, California, United States.
Current conditions
- Clouds
- 3%
- Chance of rain
- 1%
- Rain
- 0.0 mm/h
Hourly Forecast
Light rain for 3 of the next 24 hours (under 1 mm/h, 1.0 mm total) — cloudy, but fine to be out
Daily Forecast
Best Time to Visit
Peak season Jun–OctOff season Dec–Mar
About Foster City weather
Is it raining in Foster City right now?
No. It’s clear and 18° right now. Light rain for 3 of the next 24 hours (under 1 mm/h, 1.0 mm total) — cloudy, but fine to be out.
What’s the weather like in Foster City this week?
Over the next 7 days, expect highs of 16–21° and lows of 8–15°. Rain is likely on 2 of 7 days (Sunday, Tuesday). The driest day looks like Monday.
Has it been raining in Foster City lately?
Barely. The past 7 days were mostly dry, with 0.0 mm of rain in total.
What should I pack for Foster City?
For the coming week, bring an umbrella or rain jacket and a warm layer for the evenings.
Foster City weather by month
When is the best time to visit Foster City?
Based on weather alone, the best time to visit Foster City is Jun–Oct, according to NASA's 2001–2025 climate averages. Dec–Mar tends to be the least pleasant. Average highs run from 13°C (56°F) in January to 19°C (66°F) in September.
What is the rainiest month in Foster City?
December is the wettest month, with about 115 mm (4.5 in) of rain on average. August is the driest, with about 2 mm (0.1 in).
What is the hottest month in Foster City?
September is the warmest, with average highs of 19°C (66°F) and lows of 13°C (56°F). January is the coolest, with highs of 13°C (56°F) and lows of 8°C (47°F).
Does Foster City have a rainy season?
Not a strong one. No month averages more than 150 mm of rain; the wettest is December at about 115 mm (4.5 in).
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), forecast and current conditions from Open-Meteo. Page updated . How we rate months