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Current Weather in Foster City, CA

Updated: Fri Sep 18th 2026 2:30 AM PDT
Clear

56°F 13°C

Feels Like 55°F / 13°C

Foster City, CA weather condition is Clear and 56°F.

Today's Weather in Foster City,CA

The current weather in Foster City CA as of 2:30 AM PDT on Fri Sep 18th 2026, has a sky condition of Clear with the visibility of 6 mile(s). It is 56 degrees fahrenheit but feels like 55 degrees with a forecasted high of 73 and low of 55. The barometric pressure is 30.1 - measured by inches of mercury - and is steady since its last observation. The humidity is 89 percent that's rising since the last report, with a dew point of 52 degrees fahrenheit which is falling. Wind direction is from the Southwest at 3.1 miles per hour, gusting at 3.2 miles per hour. Sunrise is at 6:53 AM and Sunset is at 7:12 PM. The moon phase is a First Quarter moon rising at 2:59 PM with 53% illumination. Thank you for listening to the weather report from LocalConditions.com!

Listen to this weather report - press Read

  • Barometer 30.1 inHg. steady
  • Humidity 89% rising
  • Heat Index 56°F
  • Wind from SW. 3.1 mph
  • Wind Gust 3.2 miles per hour
  • Wind Chill 56°F
  • UV Index 0
  • Dew Point 52°F falling
  • Visibility 6 mi.
  • Sunrise 6:53 AM
  • Sunset 7:12 PM
  • Moonrise 2:59 PM
  • Moonset Not Observable
  • Moon Phase First Quarter Moon 53%

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Hourly Forecast - Next 8 hours

5 Day Forecast

Sunny

Sunny with a high of 73°F and a low of 55°F. 7% possible chance of rain predicted. Winds will be light at 10mph at times. The humidity will be on the higher side, reaching around 75%.

Temperature Humidity Rainfall Snow Wind
Hi 73° | Lo 55° 75% 7% 0% 9.2 mph

Sunny

Sunny with a high of 74°F and a low of 55°F. 10% possible chance of rain predicted. Winds will be light at 9mph at times. The humidity will be on the higher side, reaching around 77%.

Temperature Humidity Rainfall Snow Wind
Hi 74° | Lo 55° 77% 10% 0% 8.7 mph

Sunny

Sunny with a high of 68°F and a low of 55°F. 15% possible chance of rain predicted. Winds will be light at 10mph at times. The humidity will be on the higher side, reaching around 79%.

Temperature Humidity Rainfall Snow Wind
Hi 68° | Lo 55° 79% 15% 0% 9.2 mph

Sunny

Sunny with a high of 71°F and a low of 54°F. 10% possible chance of rain predicted. Winds will be light at 8mph at times. The humidity will be on the higher side, reaching around 76%.

Temperature Humidity Rainfall Snow Wind
Hi 71° | Lo 54° 76% 10% 0% 7.6 mph

Sunny

Sunny with a high of 74°F and a low of 54°F. 8% possible chance of rain predicted. Winds will be light at 8mph at times. The humidity will be on the higher side, reaching around 71%.

Temperature Humidity Rainfall Snow Wind
Hi 74° | Lo 54° 71% 8% 0% 7.8 mph
Yesterday5-Day10-Day

Weather Radar Map

Live Foster City, CA weather with granular precipitation, radar, barometric pressure, temperatures and wind speeds for today thru Tuesday, as you toggle through each map layer. Use the slider to move forward and back in time to view how current data and forecasts will affect the region; you can press or click on the map to show metrics available for each tab. The related timestamp is located above the Play button which will animate the weather forecast.

Hourly Temperature

 

The current temperature today is 56°F. The morning temperature of 55°F is lowest at 4am with the daytime high of 73°F at 2pm and a low around 56°F at 10pm is expected.

Hourly Barometric Pressure

 

The highest pressure today is 30.12inHg at 8am and lowest being 30.01inHg at 5pm.

Hourly Wind Speeds

 

The fastest wind is reported to be 9.2mph at 4pm, while the slowest is 2.7mph around 8am; expect wind gusts peaking 14.8mph at 11am.

More Weather Charts

Current National Weather

 

More Flash Flooding Expected in the Southwest and Plains: 09-17 to 09-19
Updated Thu Sep 17th 2026, 5:06am PDT

This week, we're looking at more flash flooding risks in parts of the Southwest, Northern Plains, and Upper Midwest. High temperatures will persist across the South-Central U.S. with possible record highs. Watch out for scattered thunderstorms in Florida, though they won't bring excessive rain. Stay safe and keep updated!

Southwest and Rockies

On Thursday, the focus for heavy rain shifts from the Great Basin to the Southern Rockies. A moisture-rich system will enhance showers and isolated thunderstorms, leading to potential flash flooding. Although fewer storms than yesterday, high rainfall rates make flash floods still a concern.

Northern Plains to Upper Midwest

Expect heavy rain from Friday into Saturday as a new low-pressure system forms over the Central High Plains. This system will bring more flash flooding risks from the Northern Plains to the Upper Midwest. The cold air from Canada will bring cooler temperatures, leading to highs in the 60s and 70s north of the front.

South-Central U.S.

The South-Central U.S. will continue to experience hot temperatures due to a strong upper-level high pressure—a heat dome—causing highs in the 90s and 100s. Heat advisories are in place, and daily record highs might be challenged.

Florida

Expect scattered thunderstorms in Florida due to a stationary front near the heat dome. Heavy downpours are possible, but they won't likely lead to excessive rainfall.

This weather report is valid for ZIP code 94420, accurately covering the area of Foster City, CA.

Radar National Forecast