Monthly outlook for San Quentin, CA: average high 64.5°, average low 54°. That is 1.2° below the climate normal for October. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 2 days and 0.9 inches. The warmest day looks like 24 October (70°), the coolest 27 October (47.6°).
64.5°/54°
Average high / low
−1.2°
Below normal
2 / 2
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
22 October – 31 October
64.7°
67.2°
-1.4°
1 November – 10 November
64°
64.6°
-0.4°
11 November – 20 November
at normal
61.4°
—
October records over 66 years
98.1°6 October 2024All-time high
41.2°31 October 1989All-time low
Climate normals and records are computed from the nearest reference point — Marin City (5 mi).
Fri, 2368° / 54°0
68 °
San Quentin, Friday, 23 October
Partly cloudy. High 68°, low 54°.
Pressure30.09 inHg
Wind4.5 mph NE
Humidity78%
Visibility6.2 mi
Dew point55°
Sat, 2470° / 48°0
70 °
San Quentin, Saturday, 24 October
Clear. High 70°, low 48°.
Pressure30.03 inHg
Wind2 mph E
Humidity39%
Visibility6.0 mi
Dew point42°
Sun, 2567° / 49°0
67 °
San Quentin, Sunday, 25 October
Partly cloudy. High 67°, low 49°.
Pressure30.06 inHg
Wind1.7 mph NE
Humidity62%
Visibility4.5 mi
Dew point50°
Mon, 2666° / 51°0
66 °
San Quentin, Monday, 26 October
Clear. High 66°, low 51°.
Pressure30.12 inHg
Wind6.3 mph W
Humidity62%
Visibility2.6 mi
Dew point50°
Tue, 2766° / 48°0
66 °
San Quentin, Tuesday, 27 October
Clear. High 66°, low 48°.
Pressure30.12 inHg
Wind7.2 mph W
Humidity62%
Visibility—
Dew point45°
Wed, 2862° / 50°0
62 °
San Quentin, Wednesday, 28 October
Partly cloudy. High 62°, low 50°.
Pressure30.00 inHg
Wind6.6 mph SW
Humidity64%
Visibility—
Dew point43°
Thu, 2962° / 56°0
62 °
San Quentin, Thursday, 29 October
Clear. High 62°, low 56°.
Pressure29.94 inHg
Wind7.7 mph SW
Humidity76%
Visibility—
Dew point50°
Fri, 3063° / 54°0
63 °
San Quentin, Friday, 30 October
Clear. High 63°, low 54°.
Pressure29.94 inHg
Wind7.8 mph SW
Humidity73%
Visibility—
Dew point49°
Sat, 3162° / 56°0
62 °
San Quentin, Saturday, 31 October
Overcast. High 62°, low 56°.
Pressure29.88 inHg
Wind7.4 mph NW
Humidity53%
Visibility—
Dew point41°
Sun, 0163° / 55°0.11
63 °
San Quentin, Sunday, 1 November
Light rain. High 63°, low 55°.
Pressure29.83 inHg
Wind9.9 mph NE
Humidity78%
Visibility—
Dew point51°
Mon, 0265° / 56°0
65 °
San Quentin, Monday, 2 November
Clear. High 65°, low 56°.
Pressure29.91 inHg
Wind10 mph W
Humidity62%
Visibility—
Dew point46°
Tue, 0366° / 58°0
66 °
San Quentin, Tuesday, 3 November
Clear. High 66°, low 58°.
Pressure29.88 inHg
Wind8 mph SW
Humidity40%
Visibility—
Dew point36°
Wed, 0466° / 57°0
66 °
San Quentin, Wednesday, 4 November
Mostly clear. High 66°, low 57°.
Pressure30.00 inHg
Wind8.3 mph NE
Humidity44%
Visibility—
Dew point37°
Thu, 0563° / 58°0
63 °
San Quentin, Thursday, 5 November
Overcast. High 63°, low 58°.
Pressure30.03 inHg
Wind9.1 mph SW
Humidity52%
Visibility—
Dew point42°
Fri, 0662° / 59°0.01
62 °
San Quentin, Friday, 6 November
Light rain. High 62°, low 59°.
Pressure29.94 inHg
Wind13.7 mph S
Humidity81%
Visibility—
Dew point54°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 0764° / 50°0.09
64 °
San Quentin, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high64°
Average low50°
Average precipitation0.09 in
Chance of precipitation25%
Record high79° (1991)
Record low42° (1971)
Sun, 0863° / 49°0.08
63 °
San Quentin, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high63°
Average low49°
Average precipitation0.08 in
Chance of precipitation25%
Record high75° (1976)
Record low41° (1983)
Mon, 0963° / 48°0.09
63 °
San Quentin, Monday, 9 November
Climate normal for this date — 60-year average.
Average high63°
Average low48°
Average precipitation0.09 in
Chance of precipitation20%
Record high73° (1976)
Record low41° (1998)
Tue, 1062° / 49°0.14
62 °
San Quentin, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high62°
Average low49°
Average precipitation0.14 in
Chance of precipitation28%
Record high76° (1990)
Record low40° (1982)
Wed, 1162° / 49°0.1
62 °
San Quentin, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high62°
Average low49°
Average precipitation0.1 in
Chance of precipitation27%
Record high76° (1990)
Record low37° (2000)
Thu, 1263° / 48°0.08
63 °
San Quentin, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high63°
Average low48°
Average precipitation0.08 in
Chance of precipitation20%
Record high75° (1990)
Record low37° (1985)
Fri, 1362° / 49°0.14
62 °
San Quentin, Friday, 13 November
Climate normal for this date — 60-year average.
Average high62°
Average low49°
Average precipitation0.14 in
Chance of precipitation27%
Record high73° (1995)
Record low35° (1985)
Sat, 1462° / 48°0.06
62 °
San Quentin, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high62°
Average low48°
Average precipitation0.06 in
Chance of precipitation22%
Record high77° (2008)
Record low37° (1985)
Sun, 1562° / 49°0.09
62 °
San Quentin, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high62°
Average low49°
Average precipitation0.09 in
Chance of precipitation22%
Record high75° (2010)
Record low39° (1978)
Mon, 1661° / 49°0.12
61 °
San Quentin, Monday, 16 November
Climate normal for this date — 60-year average.
Average high61°
Average low49°
Average precipitation0.12 in
Chance of precipitation27%
Record high72° (2008)
Record low39° (2009)
Tue, 1761° / 48°0.13
61 °
San Quentin, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high61°
Average low48°
Average precipitation0.13 in
Chance of precipitation25%
Record high73° (2008)
Record low37° (2000)
Wed, 1861° / 48°0.07
61 °
San Quentin, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high61°
Average low48°
Average precipitation0.07 in
Chance of precipitation20%
Record high72° (2005)
Record low37° (1964)
Thu, 1960° / 47°0.07
60 °
San Quentin, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high60°
Average low47°
Average precipitation0.07 in
Chance of precipitation27%
Record high72° (1989)
Record low35° (1985)
Fri, 2060° / 47°0.11
60 °
San Quentin, Friday, 20 November
Climate normal for this date — 60-year average.
Average high60°
Average low47°
Average precipitation0.11 in
Chance of precipitation28%
Record high71° (1989)
Record low36° (2000)
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 Quentin, 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 Quentin, 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.