As of 18:19 PDT

Weather in Foster City, CA

71°

Foster City, Saturday, 8 August, 18:19

Clear. Feels like 71°. High 83°, low 60°.

Pressure29.88 inHg

Wind7 mph NW

Humidity69%

Visibility6.2 mi

Dew point61°

See detailed hourly forecast

Monthly outlook for Foster City, CA: average high 74.6°, average low 57.5°. That is 0.4° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 9 August (88.6°), the coolest 19 August (55.8°).

74.6°/57.5°

Average high / low

+0.4°

Above normal

0 / 0

Wet days / normal

0.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 August – 17 August	76.7°	74.2°	+1.4°
18 August – 27 August	71.1°	73.8°	-1.5°
28 August – 6 September	at normal	75.6°	—

August records over 66 years

95.9°1 August 1993All-time high

52.2°10 August 1960All-time low

Sun, 0989° / 63°

89 °

Foster City, Sunday, 9 August

Clear. High 89°, low 63°.

Pressure29.83 inHg

Wind7.1 mph NW

Humidity48%

Visibility6.2 mi

Dew point53°

Mon, 1078° / 57°

78 °

Foster City, Monday, 10 August

Clear. High 78°, low 57°.

Pressure29.88 inHg

Wind6.8 mph NW

Humidity52%

Visibility6.2 mi

Dew point53°

Tue, 1177° / 56°

77 °

Foster City, Tuesday, 11 August

Clear. High 77°, low 56°.

Pressure29.91 inHg

Wind6 mph NW

Humidity52%

Visibility6.2 mi

Dew point53°

Wed, 1275° / 57°

75 °

Foster City, Wednesday, 12 August

Overcast. High 75°, low 57°.

Pressure29.85 inHg

Wind6.3 mph W

Humidity57%

Visibility6.2 mi

Dew point54°

Thu, 1375° / 58°

75 °

Foster City, Thursday, 13 August

Overcast. High 75°, low 58°.

Pressure29.83 inHg

Wind10 mph W

Humidity54%

Visibility—

Dew point55°

Fri, 1473° / 56°

73 °

Foster City, Friday, 14 August

Clear. High 73°, low 56°.

Pressure29.94 inHg

Wind9.7 mph W

Humidity56%

Visibility—

Dew point54°

Sat, 1573° / 57°

73 °

Foster City, Saturday, 15 August

Clear. High 73°, low 57°.

Pressure30.03 inHg

Wind9.5 mph NW

Humidity56%

Visibility—

Dew point55°

Sun, 1673° / 57°

73 °

Foster City, Sunday, 16 August

Overcast. High 73°, low 57°.

Pressure30.06 inHg

Wind9.6 mph NW

Humidity54%

Visibility—

Dew point54°

Mon, 1772° / 59°

72 °

Foster City, Monday, 17 August

Overcast. High 72°, low 59°.

Pressure30.06 inHg

Wind10 mph NW

Humidity57%

Visibility—

Dew point54°

Tue, 1871° / 57°

71 °

Foster City, Tuesday, 18 August

Partly cloudy. High 71°, low 57°.

Pressure30.06 inHg

Wind12.8 mph NW

Humidity55%

Visibility—

Dew point53°

Wed, 1972° / 56°

72 °

Foster City, Wednesday, 19 August

Clear. High 72°, low 56°.

Pressure30.00 inHg

Wind10.2 mph W

Humidity52%

Visibility—

Dew point51°

Thu, 2068° / 57°

68 °

Foster City, Thursday, 20 August

Overcast. High 68°, low 57°.

Pressure29.94 inHg

Wind8.7 mph W

Humidity63%

Visibility—

Dew point54°

Fri, 2173° / 56°

73 °

Foster City, Friday, 21 August

Clear. High 73°, low 56°.

Pressure29.88 inHg

Wind9.6 mph W

Humidity55%

Visibility—

Dew point54°

Sat, 2271° / 57°

71 °

Foster City, Saturday, 22 August

Overcast. High 71°, low 57°.

Pressure29.94 inHg

Wind9.3 mph W

Humidity59%

Visibility—

Dew point55°

Sun, 2372° / 56°

72 °

Foster City, Sunday, 23 August

Mostly clear. High 72°, low 56°.

Pressure29.94 inHg

Wind9.2 mph NW

Humidity58%

Visibility—

Dew point55°

From day 17 onward the outlook is built from 60-year climate statistics

Mon, 2474° / 58°

74 °

Foster City, Monday, 24 August

Climate normal for this date — 60-year average.

Average high74°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high96° (2010)

Record low53° (1970)

Tue, 2574° / 58°

74 °

Foster City, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high74°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high88° (2010)

Record low54° (1960)

Wed, 2674° / 57°

74 °

Foster City, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high74°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high86° (1993)

Record low53° (1970)

Thu, 2776° / 58°

76 °

Foster City, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high76°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high92° (1993)

Record low54° (2012)

Fri, 2876° / 58°

76 °

Foster City, Friday, 28 August

Climate normal for this date — 60-year average.

Average high76°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high94° (2009)

Record low53° (1995)

Sat, 2975° / 58°

75 °

Foster City, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high75°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high96° (1968)

Record low53° (1975)

Sun, 3074° / 58°

74 °

Foster City, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high74°

Average low58°

Average precipitation0 in

Chance of precipitation2%

Record high87° (1968)

Record low53° (1975)

Mon, 3175° / 58°

75 °

Foster City, Monday, 31 August

Climate normal for this date — 60-year average.

Average high75°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high86° (2005)

Record low53° (1975)

Tue, 0176° / 58°

76 °

Foster City, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high76°

Average low58°

Average precipitation0 in

Chance of precipitation2%

Record high101° (2017)

Record low53° (1970)

Wed, 0276° / 58°

76 °

Foster City, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high76°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high102° (2017)

Record low54° (1964)

Thu, 0375° / 58°

75 °

Foster City, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high75°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high92° (2017)

Record low53° (1995)

Fri, 0476° / 58°

76 °

Foster City, Friday, 4 September

Climate normal for this date — 60-year average.

Average high76°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high91° (2008)

Record low52° (2000)

Sat, 0576° / 58°

76 °

Foster City, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high76°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high93° (2004)

Record low53° (1970)

Sun, 0677° / 58°

77 °

Foster City, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high77°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high105° (2022)

Record low53° (1980)

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Foster City, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Foster City, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.