When to go · Foster City
Foster City, month by month
The best months for Foster City: Apr, May, Jun, Sep, Oct. Months to avoid: Jan, Feb, Mar, Nov, Dec.
Month by month
- JanuaryAvoidListed as a month to avoid: Nov–Mar (rain), though winter is mild.14 °C (57 °F) / 6 °C (43 °F), 11 rain days57 °F (14 °C) / 43 °F (6 °C), 11 rain daysCrowds: Low
- FebruaryAvoidListed as a month to avoid: Nov–Mar (rain), though winter is mild.16 °C (61 °F) / 7 °C (45 °F), 10 rain days61 °F (16 °C) / 45 °F (7 °C), 10 rain daysCrowds: Low · 1 festival or holiday
- MarchAvoidListed as a month to avoid: Nov–Mar (rain), though winter is mild.17 °C (63 °F) / 8 °C (46 °F), 10 rain days63 °F (17 °C) / 46 °F (8 °C), 10 rain daysCrowds: Medium · 2 festivals or holidays
- AprilGreatInside Foster City's best window: Apr–Jun, Sep–Oct.19 °C (66 °F) / 9 °C (48 °F), 6 rain days66 °F (19 °C) / 48 °F (9 °C), 6 rain daysCrowds: Medium · 1 festival or holiday
- MayGreatInside Foster City's best window: Apr–Jun, Sep–Oct.21 °C (70 °F) / 11 °C (52 °F), 4 rain days70 °F (21 °C) / 52 °F (11 °C), 4 rain daysCrowds: Medium · 1 festival or holiday
- JuneGreatInside Foster City's best window: Apr–Jun, Sep–Oct.23 °C (73 °F) / 12 °C (54 °F), 1 rain days73 °F (23 °C) / 54 °F (12 °C), 1 rain daysCrowds: High
- JulyMixedOutside the best window (Apr–Jun, Sep–Oct). Across United States: Peak season: parks full, 4 July crowds, 40 °C (104 °F)+ in the desert, humid East. Alaska and the Pacific Northwest are at their best.Outside the best window (Apr–Jun, Sep–Oct). Across United States: Peak season: parks full, 4 July crowds, 104 °F (40 °C)+ in the desert, humid East. Alaska and the Pacific Northwest are at their best.24 °C (75 °F) / 13 °C (55 °F), 0 rain days75 °F (24 °C) / 55 °F (13 °C), 0 rain daysCrowds: High · 1 festival or holiday
- AugustMixedOutside the best window (Apr–Jun, Sep–Oct). Across United States: Hot and busy; wildfire smoke in the West, hurricane peak begins in the Southeast.24 °C (75 °F) / 13 °C (55 °F), 1 rain days75 °F (24 °C) / 55 °F (13 °C), 1 rain daysCrowds: High
- SeptemberGreatInside Foster City's best window: Apr–Jun, Sep–Oct.25 °C (77 °F) / 13 °C (55 °F), 2 rain days77 °F (25 °C) / 55 °F (13 °C), 2 rain daysCrowds: Medium · 1 festival or holiday
- OctoberGreatInside Foster City's best window: Apr–Jun, Sep–Oct.23 °C (73 °F) / 11 °C (52 °F), 4 rain days73 °F (23 °C) / 52 °F (11 °C), 4 rain daysCrowds: Medium
- NovemberAvoidListed as a month to avoid: Nov–Mar (rain), though winter is mild.18 °C (64 °F) / 8 °C (46 °F), 8 rain days64 °F (18 °C) / 46 °F (8 °C), 8 rain daysCrowds: Medium · 1 festival or holiday
- DecemberAvoidListed as a month to avoid: Nov–Mar (rain), though winter is mild.14 °C (57 °F) / 6 °C (43 °F), 10 rain days57 °F (14 °C) / 43 °F (6 °C), 10 rain daysCrowds: High · 1 festival or holiday
Compare two months
Weather, crowds and prices for any two months in Foster City, side by side.
Verdict
Apr: Great
May: Great
Daytime high
Apr: 19 °C (66 °F)66 °F (19 °C)
May: 21 °C (70 °F)70 °F (21 °C)
Night low
Apr: 9 °C (48 °F)48 °F (9 °C)
May: 11 °C (52 °F)52 °F (11 °C)
Rain days
Apr: 6
May: 4 (better)
Crowds
Apr: Medium
May: Medium
Prices
Apr: Medium
May: Medium
Festivals listed
Apr: 1
May: 1
April: Inside Foster City's best window: Apr–Jun, Sep–Oct.
May: Inside Foster City's best window: Apr–Jun, Sep–Oct.
Foster City: figures are long-term averages from this guide, not a forecast.