As of 04:20 PDT

Weather in Foster City, CA

58°

Foster City, Friday, 23 October, 04:20

Overcast. Feels like 58°. High 65°, low 56°.

Pressure29.97 inHg

Wind6.9 mph SW

Humidity89%

Visibility6.2 mi

Dew point55°

See detailed hourly forecast

Monthly outlook for Foster City, CA: average high 66.4°, average low 56.2°. That is 0.3° below the climate normal for October. Precipitation is expected on 3 days (about 0.3 inches), against a normal of 2 days and 0.8 inches. The warmest day looks like 3 November (71.6°), the coolest 24 October (51.2°).

66.4°/56.2°

Average high / low

−0.3°

Below normal

3 / 2

Wet days / normal

0.3 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
23 October – 1 November	65.3°	67.7°	-1.3°
2 November – 11 November	68.2°	64.7°	+2°
12 November – 21 November	at normal	61.6°	—

October records over 66 years

97.9°5 October 1987All-time high

40.6°29 October 1971All-time low

Sat, 2467° / 51°

67 °

Foster City, Saturday, 24 October

Clear. High 67°, low 51°.

Pressure30.03 inHg

Wind3.7 mph SW

Humidity50%

Visibility6.2 mi

Dew point42°

Sun, 2566° / 56°

66 °

Foster City, Sunday, 25 October

Overcast. High 66°, low 56°.

Pressure30.06 inHg

Wind3.8 mph N

Humidity89%

Visibility—

Dew point56°

Mon, 2664° / 56°

64 °

Foster City, Monday, 26 October

Partly cloudy. High 64°, low 56°.

Pressure30.12 inHg

Wind1.6 mph NW

Humidity76%

Visibility1.9 mi

Dew point53°

Tue, 2764° / 55°

64 °

Foster City, Tuesday, 27 October

Overcast. High 64°, low 55°.

Pressure30.09 inHg

Wind10.4 mph W

Humidity91%

Visibility—

Dew point53°

Wed, 2865° / 56°

65 °

Foster City, Wednesday, 28 October

Overcast. High 65°, low 56°.

Pressure30.00 inHg

Wind6.4 mph SW

Humidity80%

Visibility—

Dew point52°

Thu, 2964° / 53°

64 °

Foster City, Thursday, 29 October

Clear. High 64°, low 53°.

Pressure29.94 inHg

Wind9 mph NW

Humidity58%

Visibility—

Dew point45°

Fri, 3063° / 52°

63 °

Foster City, Friday, 30 October

Clear. High 63°, low 52°.

Pressure30.03 inHg

Wind6.9 mph NW

Humidity55%

Visibility—

Dew point43°

Sat, 3167° / 53°

67 °

Foster City, Saturday, 31 October

Clear. High 67°, low 53°.

Pressure30.06 inHg

Wind4.8 mph NW

Humidity27%

Visibility—

Dew point26°

Sun, 0168° / 58°

68 °

Foster City, Sunday, 1 November

Overcast. High 68°, low 58°.

Pressure30.06 inHg

Wind5.6 mph NW

Humidity30%

Visibility—

Dew point29°

Mon, 0266° / 60°

66 °

Foster City, Monday, 2 November

Overcast. High 66°, low 60°.

Pressure30.03 inHg

Wind5.2 mph SE

Humidity36%

Visibility—

Dew point34°

Tue, 0372° / 57°

0.11

72 °

Foster City, Tuesday, 3 November

Light rain. High 72°, low 57°.

Pressure30.03 inHg

Wind5.3 mph W

Humidity61%

Visibility—

Dew point51°

Wed, 0470° / 61°

0.1

70 °

Foster City, Wednesday, 4 November

Light rain. High 70°, low 61°.

Pressure30.09 inHg

Wind8.3 mph SW

Humidity67%

Visibility—

Dew point57°

Thu, 0568° / 59°

0.04

68 °

Foster City, Thursday, 5 November

Light rain. High 68°, low 59°.

Pressure30.18 inHg

Wind8.4 mph NW

Humidity75%

Visibility—

Dew point57°

Fri, 0665° / 57°

65 °

Foster City, Friday, 6 November

Overcast. High 65°, low 57°.

Pressure30.21 inHg

Wind5.7 mph NW

Humidity63%

Visibility—

Dew point50°

Sat, 0769° / 59°

69 °

Foster City, Saturday, 7 November

Overcast. High 69°, low 59°.

Pressure30.12 inHg

Wind5.2 mph NW

Humidity66%

Visibility—

Dew point53°

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

Sun, 0864° / 52°

0.08

64 °

Foster City, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high64°

Average low52°

Average precipitation0.08 in

Chance of precipitation25%

Record high78° (1976)

Record low43° (1982)

Mon, 0963° / 51°

0.07

63 °

Foster City, Monday, 9 November

Climate normal for this date — 60-year average.

Average high63°

Average low51°

Average precipitation0.07 in

Chance of precipitation23%

Record high76° (1976)

Record low43° (1982)

Tue, 1063° / 51°

0.11

63 °

Foster City, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high63°

Average low51°

Average precipitation0.11 in

Chance of precipitation30%

Record high78° (1990)

Record low42° (2020)

Wed, 1163° / 51°

0.09

63 °

Foster City, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high63°

Average low51°

Average precipitation0.09 in

Chance of precipitation27%

Record high80° (1990)

Record low40° (1985)

Thu, 1263° / 51°

0.07

63 °

Foster City, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high63°

Average low51°

Average precipitation0.07 in

Chance of precipitation17%

Record high77° (1990)

Record low42° (1985)

Fri, 1363° / 51°

0.12

63 °

Foster City, Friday, 13 November

Climate normal for this date — 60-year average.

Average high63°

Average low51°

Average precipitation0.12 in

Chance of precipitation27%

Record high76° (1995)

Record low42° (1985)

Sat, 1462° / 50°

0.06

62 °

Foster City, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high62°

Average low50°

Average precipitation0.06 in

Chance of precipitation22%

Record high76° (2008)

Record low38° (1964)

Sun, 1563° / 50°

0.07

63 °

Foster City, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high63°

Average low50°

Average precipitation0.07 in

Chance of precipitation17%

Record high76° (2008)

Record low37° (1964)

Mon, 1662° / 51°

0.1

62 °

Foster City, Monday, 16 November

Climate normal for this date — 60-year average.

Average high62°

Average low51°

Average precipitation0.1 in

Chance of precipitation25%

Record high76° (2008)

Record low38° (1964)

Tue, 1762° / 50°

0.12

62 °

Foster City, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high62°

Average low50°

Average precipitation0.12 in

Chance of precipitation28%

Record high77° (2008)

Record low39° (1964)

Wed, 1861° / 49°

0.06

61 °

Foster City, Wednesday, 18 November

Climate normal for this date — 60-year average.

Average high61°

Average low49°

Average precipitation0.06 in

Chance of precipitation22%

Record high75° (2005)

Record low38° (1994)

Thu, 1960° / 49°

0.04

60 °

Foster City, Thursday, 19 November

Climate normal for this date — 60-year average.

Average high60°

Average low49°

Average precipitation0.04 in

Chance of precipitation25%

Record high75° (1989)

Record low38° (1977)

Fri, 2061° / 49°

0.1

61 °

Foster City, Friday, 20 November

Climate normal for this date — 60-year average.

Average high61°

Average low49°

Average precipitation0.1 in

Chance of precipitation25%

Record high73° (1989)

Record low40° (1971)

Sat, 2160° / 49°

0.08

60 °

Foster City, Saturday, 21 November

Climate normal for this date — 60-year average.

Average high60°

Average low49°

Average precipitation0.08 in

Chance of precipitation27%

Record high71° (2005)

Record low38° (1985)

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.