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Foster City, United States Snapshot 2026
Where is Foster City?
Foster City, United States
- Continent
- Americas
- Country
- United States
- City
- Foster City
- Population
- 33.5K
- Elevation
- 2 m
- Coordinates
- 37.56°, -122.27°
Foster City is a city in United States with a population of approximately 33.5K. Average temperatures range from 8°C (46°F) in January to 25°C (76°F) in September. The best time to visit is July, August, September, October.
Time in Foster City right now
Open full time & time zone page 13:45 45
Monday, June 15, 2026
IANA time zone
America/Los_Angeles
Daylight saving
DST in effect
PST / PDT
Next DST change
November 1
backward -1h
Live weather in Foster City
Daylight in Foster City today
View full sunrise & sunset page Sunrise
Sunset
Day length
14h 45m
Climate normals for Foster City
Long-term monthly averages based on historical data.
January
Fair 
February
Fair March
Good April
Good May
Good June
Excellent July best
Excellent August best
Excellent September best
Excellent October best
Excellent November
Good December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 15°C / 8°C | 13°C / 6°C | 10days (112 mm) Wet | 6.9h Fair | 84% Humid | 3 Moderate | Fair | View Details |
| February | 16°C / 8°C | 14°C / 6°C | 7days (90 mm) Good | 8.5h Good | 79% Humid | 3.8 Moderate | Fair | View Details |
| March | 16°C / 9°C | 15°C / 7°C | 12days (99 mm) Wet | 9.4h Good | 79% Humid | 5.6 High | Good | View Details |
| April | 18°C / 10°C | 18°C / 8°C | 5days (30 mm) Good | 11h Excellent | 77% Humid | 6.9 High | Good | View Details |
| May | 20°C / 11°C | 20°C / 10°C | 3days (18 mm) Excellent | 12.5h Excellent | 75% Muggy | 7.9 Very High | Good | View Details |
| June | 23°C / 13°C | 23°C / 12°C | 0days (1 mm) Excellent | 13.3h Excellent | 72% Muggy | 8.2 Very High | Excellent | View Details |
| July best | 23°C / 14°C | 24°C / 13°C | 0days (0 mm) Excellent | 13.1h Excellent | 74% Muggy | 8.2 Very High | Excellent | View Details |
| August best | 24°C / 15°C | 25°C / 15°C | 0days (1 mm) Excellent | 12.3h Excellent | 75% Muggy | 7.6 Very High | Excellent | View Details |
| September best | 25°C / 15°C | 25°C / 15°C | 1days (3 mm) Excellent | 11.3h Excellent | 74% Muggy | 6.4 High | Excellent | View Details |
| October best | 23°C / 14°C | 22°C / 13°C | 2days (24 mm) Excellent | 9.6h Good | 72% Muggy | 5 Moderate | Excellent | View Details |
| November | 18°C / 11°C | 17°C / 10°C | 6days (54 mm) Good | 8.1h Good | 79% Humid | 3.4 Moderate | Good | View Details |
| December | 15°C / 8°C | 13°C / 6°C | 9days (98 mm) Wet | 6.7h Fair | 83% Humid | 2.7 Moderate | Fair | View Details |
Monthly Temperatures
HighLow
Line chart showing monthly temperatures. Jan: 15°C / 8°C . Feb: 16°C / 8°C . Mar: 16°C / 9°C . Apr: 18°C / 10°C . May: 20°C / 11°C . Jun: 23°C / 13°C . Jul: 23°C / 14°C . Aug: 24°C / 15°C . Sep: 25°C / 15°C . Oct: 23°C / 14°C . Nov: 18°C / 11°C . Dec: 15°C / 8°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 112 mm. Feb: 90 mm. Mar: 99 mm. Apr: 30 mm. May: 18 mm. Jun: 1 mm. Jul: 0 mm. Aug: 1 mm. Sep: 3 mm. Oct: 24 mm. Nov: 54 mm. Dec: 98 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 84%. Feb: 79%. Mar: 79%. Apr: 77%. May: 75%. Jun: 72%. Jul: 74%. Aug: 75%. Sep: 74%. Oct: 72%. Nov: 79%. Dec: 83%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 14 km/h . Feb: 16 km/h . Mar: 16 km/h . Apr: 16 km/h . May: 16 km/h . Jun: 16 km/h . Jul: 13 km/h . Aug: 13 km/h . Sep: 13 km/h . Oct: 13 km/h . Nov: 12 km/h . Dec: 12 km/h .
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 12°C . Feb: 12°C . Mar: 14°C . Apr: 17°C . May: 20°C . Jun: 21°C . Jul: 22°C . Aug: 23°C . Sep: 22°C . Oct: 20°C . Nov: 16°C . Dec: 13°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 4. Mar: UV 6. Apr: UV 7. May: UV 8. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 6. Oct: UV 5. Nov: UV 3. Dec: UV 3.
Frequently Asked Questions
Foster City has a population of approximately 33.5K.
The best months to visit Foster City are July, August, September, October, when temperatures are pleasant and rainfall is lower.
Foster City receives approximately 530mm of rainfall annually across 55 rainy days.
Foster City is located in United States, in the Americas region.
Foster City sits at an elevation of 2 m (7 ft) above sea level.