Best year time to visit Foster City

General weather information about Foster City

Average annual temperature is 7.2 °C

Absolute maximum temperature: 33.4 °C

Absolute minimum temperature: -23.8 °C

Number of sunny days: 169 days

Number of rainy days: 154 days

Number of snow days: 42 days

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* Weather data for Foster City United States is based on climate observations for 2026 year

Foster City air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)2.77.67.827.631.332.432.729.333.428.615.19.9
Average daytime temperature (°C)-1.9-0.92.211.320.225.125.924.822.413.45.73.4
Average temperature (°C)-5.4-6.1-3.14.612.718.419.318.616.69.01.00.0
Average night temperature (°C)-8.3-10.4-7.7-0.36.612.313.813.612.15.7-2.2-2.5
Absolute minimum temperature (°C)-23.8-22.5-14.8-11.1-2.44.69.77.05.1-5.1-9.3-8.9

Foster City monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.08.0
Daylight mean duration (h)9.110.411.913.614.915.715.314.112.510.99.58.7
Daylight minimum duration (h)8.09.011.012.014.015.014.013.011.010.08.08.0
Sunshine mean duration (h)3.16.66.86.910.612.012.310.48.46.15.43.5
Precipitation (mm)5243511437150867828592631
Sunny days13121611191471614121817
Rainy days64618121624151618811
Snow days12129100000143

Foster City - weather forecast by months

Foster City weather in januaryFoster City weather in februaryFoster City weather in marchFoster City weather in aprilFoster City weather in mayFoster City weather in juneFoster City weather in julyFoster City weather in augustFoster City weather in septemberFoster City weather in octoberFoster City weather in novemberFoster City weather in december

Best time to visit Foster City:

The best time to visit Foster City during the most sunny months:

  • May — 10.6(h)
  • June — 12.0(h)
  • July — 12.3(h)
  • August — 10.4(h)

Months with the longest average daylight duration in Foster City:

  • June — 15.7(h)
  • July — 15.3(h)

The largest precipitation sum in Foster City is at

  • April — 143(mm)
  • July — 86(mm)
  • August — 78(mm)

    • Weather forecast in the closest to Foster City admin centers

    Weather forecast in the closest towns to Foster City

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    Frequently asked questions

    When is the best time to visit Foster City?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Foster City.
    What is the weather like in Foster City?
    See average temperature, rainfall and daylight hours for Foster City by month in the table above.
    How many sunny days does Foster City have?
    The monthly weather statistics above show sunshine and rainfall patterns for Foster City throughout the year.