Monthly outlook for San Francisco, CA: average high 65.8°, average low 58°. That is 1.8° below 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 (84.5°), the coolest 10 August (56.5°).
65.8°/58°
Average high / low
−1.8°
Below 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
67.3°
69.2°
-1°
18 August – 27 August
63.3°
69.2°
-3.3°
28 August – 6 September
at normal
71°
—
August records over 66 years
92.7°29 August 1968All-time high
48.2°10 August 1960All-time low
Sun, 0984° / 59°0
84 °
San Francisco, Sunday, 9 August
Clear. High 84°, low 59°.
Pressure29.85 inHg
Wind7 mph W
Humidity66%
Visibility6.2 mi
Dew point53°
Mon, 1063° / 57°0
63 °
San Francisco, Monday, 10 August
Partly cloudy. High 63°, low 57°.
Pressure29.88 inHg
Wind14.1 mph SW
Humidity74%
Visibility6.2 mi
Dew point54°
Tue, 1164° / 57°0
64 °
San Francisco, Tuesday, 11 August
Partly cloudy. High 64°, low 57°.
Pressure29.94 inHg
Wind12.1 mph SW
Humidity71%
Visibility6.2 mi
Dew point54°
Wed, 1265° / 57°0
65 °
San Francisco, Wednesday, 12 August
Light rain. High 65°, low 57°.
Pressure29.88 inHg
Wind12.2 mph SW
Humidity73%
Visibility6.2 mi
Dew point55°
Thu, 1364° / 59°0
64 °
San Francisco, Thursday, 13 August
Partly cloudy. High 64°, low 59°.
Pressure29.85 inHg
Wind17.7 mph SW
Humidity74%
Visibility—
Dew point55°
Fri, 1464° / 60°0
64 °
San Francisco, Friday, 14 August
Overcast. High 64°, low 60°.
Pressure29.94 inHg
Wind13.3 mph SW
Humidity74%
Visibility—
Dew point55°
Sat, 1565° / 59°0
65 °
San Francisco, Saturday, 15 August
Clear. High 65°, low 59°.
Pressure30.03 inHg
Wind12.8 mph W
Humidity69%
Visibility—
Dew point54°
Sun, 1665° / 58°0
65 °
San Francisco, Sunday, 16 August
Overcast. High 65°, low 58°.
Pressure30.03 inHg
Wind13 mph W
Humidity69%
Visibility—
Dew point53°
Mon, 1764° / 59°0
64 °
San Francisco, Monday, 17 August
Overcast. High 64°, low 59°.
Pressure30.09 inHg
Wind13.3 mph W
Humidity73%
Visibility—
Dew point55°
Tue, 1864° / 57°0
64 °
San Francisco, Tuesday, 18 August
Mostly clear. High 64°, low 57°.
Pressure30.06 inHg
Wind15.7 mph W
Humidity69%
Visibility—
Dew point51°
Wed, 1965° / 57°0
65 °
San Francisco, Wednesday, 19 August
Clear. High 65°, low 57°.
Pressure30.00 inHg
Wind19.2 mph W
Humidity69%
Visibility—
Dew point53°
Thu, 2063° / 58°0
63 °
San Francisco, Thursday, 20 August
Partly cloudy. High 63°, low 58°.
Pressure29.97 inHg
Wind15.4 mph W
Humidity80%
Visibility—
Dew point56°
Fri, 2164° / 58°0
64 °
San Francisco, Friday, 21 August
Mostly clear. High 64°, low 58°.
Pressure29.91 inHg
Wind11.5 mph W
Humidity71%
Visibility—
Dew point54°
Sat, 2263° / 57°0
63 °
San Francisco, Saturday, 22 August
Overcast. High 63°, low 57°.
Pressure29.88 inHg
Wind14.7 mph SW
Humidity76%
Visibility—
Dew point55°
Sun, 2361° / 58°0
61 °
San Francisco, Sunday, 23 August
Light rain. High 61°, low 58°.
Pressure29.91 inHg
Wind15.8 mph W
Humidity80%
Visibility—
Dew point54°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2470° / 55°0
70 °
San Francisco, Monday, 24 August
Climate normal for this date — 60-year average.
Average high70°
Average low55°
Average precipitation0 in
Chance of precipitation2%
Record high90° (2010)
Record low50° (1970)
Tue, 2569° / 55°0
69 °
San Francisco, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high69°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high83° (1988)
Record low50° (1960)
Wed, 2670° / 54°0
70 °
San Francisco, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high70°
Average low54°
Average precipitation0 in
Chance of precipitation0%
Record high82° (1988)
Record low49° (2005)
Thu, 2771° / 55°0
71 °
San Francisco, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high87° (1962)
Record low51° (2006)
Fri, 2871° / 55°0
71 °
San Francisco, Friday, 28 August
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high88° (2009)
Record low50° (1960)
Sat, 2971° / 55°0
71 °
San Francisco, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high93° (1968)
Record low49° (1975)
Sun, 3070° / 55°0
70 °
San Francisco, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high70°
Average low55°
Average precipitation0 in
Chance of precipitation3%
Record high82° (1996)
Record low51° (1982)
Mon, 3170° / 55°0
70 °
San Francisco, Monday, 31 August
Climate normal for this date — 60-year average.
Average high70°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high80° (2005)
Record low50° (1975)
Tue, 0172° / 55°0
72 °
San Francisco, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high72°
Average low55°
Average precipitation0 in
Chance of precipitation2%
Record high95° (2017)
Record low49° (1999)
Wed, 0272° / 55°0
72 °
San Francisco, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high72°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high100° (2017)
Record low49° (1964)
Thu, 0371° / 55°0
71 °
San Francisco, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high88° (1961)
Record low49° (1973)
Fri, 0471° / 55°0
71 °
San Francisco, Friday, 4 September
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high86° (1961)
Record low50° (1999)
Sat, 0571° / 55°0
71 °
San Francisco, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high87° (2004)
Record low50° (1969)
Sun, 0672° / 55°0
72 °
San Francisco, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high72°
Average low55°
Average precipitation0 in
Chance of precipitation0%
Record high98° (2022)
Record low49° (1996)
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 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 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.