As of 11:19 PDT

Weather in South San Francisco, CA

70°

South San Francisco, Sunday, 9 August, 11:19

Mostly clear. Feels like 70°. High 82°, low 60°.

Pressure29.85 inHg

Wind3 mph E

Humidity74%

Visibility6.2 mi

Dew point62°

See detailed hourly forecast

Monthly outlook for South San Francisco, CA: average high 70°, average low 58.3°. That is 0.2° below the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.0 inches. The warmest day looks like 9 August (81.5°), the coolest 11 August (56.4°).

70°/58.3°

Average high / low

−0.2°

Below normal

0 / 0

Wet days / normal

0.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	70.2°	70.4°	-0.1°
19 August – 28 August	69.5°	70.7°	-0.7°
29 August – 7 September	at normal	72.1°	—

August records over 66 years

92.8°29 August 1968All-time high

51.3°19 August 2024All-time low

Mon, 1081° / 58°

81 °

South San Francisco, Monday, 10 August

Partly cloudy. High 81°, low 58°.

Pressure29.91 inHg

Wind10.3 mph W

Humidity68%

Visibility6.2 mi

Dew point54°

Tue, 1169° / 56°

69 °

South San Francisco, Tuesday, 11 August

Partly cloudy. High 69°, low 56°.

Pressure29.94 inHg

Wind8.1 mph SW

Humidity65%

Visibility6.2 mi

Dew point54°

Wed, 1268° / 57°

68 °

South San Francisco, Wednesday, 12 August

Partly cloudy. High 68°, low 57°.

Pressure29.88 inHg

Wind9.2 mph SW

Humidity71%

Visibility6.2 mi

Dew point55°

Thu, 1366° / 59°

66 °

South San Francisco, Thursday, 13 August

Mostly clear. High 66°, low 59°.

Pressure29.85 inHg

Wind15.4 mph SW

Humidity71%

Visibility—

Dew point56°

Fri, 1467° / 58°

67 °

South San Francisco, Friday, 14 August

Mostly clear. High 67°, low 58°.

Pressure29.94 inHg

Wind11 mph SW

Humidity67%

Visibility—

Dew point55°

Sat, 1567° / 58°

67 °

South San Francisco, Saturday, 15 August

Mostly clear. High 67°, low 58°.

Pressure30.03 inHg

Wind11.2 mph W

Humidity67%

Visibility—

Dew point55°

Sun, 1667° / 59°

67 °

South San Francisco, Sunday, 16 August

Overcast. High 67°, low 59°.

Pressure30.12 inHg

Wind9.4 mph W

Humidity68%

Visibility—

Dew point55°

Mon, 1769° / 59°

69 °

South San Francisco, Monday, 17 August

Overcast. High 69°, low 59°.

Pressure30.09 inHg

Wind11.7 mph W

Humidity62%

Visibility—

Dew point55°

Tue, 1868° / 58°

68 °

South San Francisco, Tuesday, 18 August

Mostly clear. High 68°, low 58°.

Pressure30.06 inHg

Wind10.7 mph W

Humidity65%

Visibility—

Dew point55°

Wed, 1968° / 59°

68 °

South San Francisco, Wednesday, 19 August

Overcast. High 68°, low 59°.

Pressure30.00 inHg

Wind9.7 mph W

Humidity64%

Visibility—

Dew point55°

Thu, 2066° / 57°

66 °

South San Francisco, Thursday, 20 August

Overcast. High 66°, low 57°.

Pressure29.94 inHg

Wind10.5 mph W

Humidity70%

Visibility—

Dew point55°

Fri, 2169° / 57°

69 °

South San Francisco, Friday, 21 August

Partly cloudy. High 69°, low 57°.

Pressure29.85 inHg

Wind10 mph W

Humidity67%

Visibility—

Dew point56°

Sat, 2271° / 58°

71 °

South San Francisco, Saturday, 22 August

Partly cloudy. High 71°, low 58°.

Pressure29.91 inHg

Wind11 mph W

Humidity61%

Visibility—

Dew point56°

Sun, 2371° / 59°

71 °

South San Francisco, Sunday, 23 August

Overcast. High 71°, low 59°.

Pressure29.94 inHg

Wind9.6 mph W

Humidity60%

Visibility—

Dew point55°

Mon, 2472° / 60°

72 °

South San Francisco, Monday, 24 August

Mostly clear. High 72°, low 60°.

Pressure29.94 inHg

Wind10 mph W

Humidity60%

Visibility—

Dew point56°

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

Tue, 2571° / 57°

71 °

South San Francisco, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high71°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high81° (2010)

Record low53° (2000)

Wed, 2671° / 57°

71 °

South San Francisco, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high71°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high80° (1993)

Record low52° (2005)

Thu, 2772° / 57°

72 °

South San Francisco, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high72°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high87° (1962)

Record low54° (1966)

Fri, 2873° / 57°

73 °

South San Francisco, Friday, 28 August

Climate normal for this date — 60-year average.

Average high73°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high87° (2009)

Record low53° (1960)

Sat, 2971° / 58°

71 °

South San Francisco, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high71°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high93° (1968)

Record low54° (2012)

Sun, 3071° / 58°

71 °

South San Francisco, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high71°

Average low58°

Average precipitation0 in

Chance of precipitation3%

Record high83° (1968)

Record low54° (2012)

Mon, 3171° / 58°

71 °

South San Francisco, Monday, 31 August

Climate normal for this date — 60-year average.

Average high71°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high80° (2005)

Record low53° (1960)

Tue, 0172° / 57°

72 °

South San Francisco, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high72°

Average low57°

Average precipitation0 in

Chance of precipitation3%

Record high100° (2017)

Record low53° (1970)

Wed, 0273° / 58°

73 °

South San Francisco, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high73°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high101° (2017)

Record low53° (1964)

Thu, 0372° / 58°

72 °

South San Francisco, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high72°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high88° (1961)

Record low53° (1973)

Fri, 0472° / 57°

72 °

South San Francisco, Friday, 4 September

Climate normal for this date — 60-year average.

Average high72°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high85° (1961)

Record low53° (1960)

Sat, 0573° / 57°

73 °

South San Francisco, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high73°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high87° (2004)

Record low53° (1969)

Sun, 0673° / 57°

73 °

South San Francisco, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high73°

Average low57°

Average precipitation0 in

Chance of precipitation0%

Record high98° (2022)

Record low53° (1980)

Mon, 0773° / 58°

73 °

South San Francisco, Monday, 7 September

Climate normal for this date — 60-year average.

Average high73°

Average low58°

Average precipitation0 in

Chance of precipitation0%

Record high85° (2004)

Record low53° (2011)

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 South San Francisco, 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 South San Francisco, 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.