Monthly outlook for San Quentin, CA: average high 64.1°, average low 53.3°. That is 1.3° below the climate normal for October. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 3 days and 1.0 inches. The warmest day looks like 23 October (69.4°), the coolest 27 October (45.9°).
64.1°/53.3°
Average high / low
−1.3°
Below normal
2 / 3
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
23 October – 1 November
63.8°
67.1°
-1.8°
2 November – 11 November
64.6°
64.2°
+0.2°
12 November – 21 November
at normal
61.1°
—
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).
Sat, 2469° / 52°0
69 °
San Quentin, Saturday, 24 October
Clear. High 69°, low 52°.
Pressure30.06 inHg
Wind2.8 mph NE
Humidity37%
Visibility6.2 mi
Dew point40°
Sun, 2569° / 48°0
69 °
San Quentin, Sunday, 25 October
Overcast. High 69°, low 48°.
Pressure30.09 inHg
Wind2.2 mph NE
Humidity62%
Visibility4.4 mi
Dew point51°
Mon, 2666° / 48°0
66 °
San Quentin, Monday, 26 October
Mostly clear. High 66°, low 48°.
Pressure30.12 inHg
Wind5.6 mph NW
Humidity60%
Visibility6.2 mi
Dew point52°
Tue, 2764° / 46°0
64 °
San Quentin, Tuesday, 27 October
Overcast. High 64°, low 46°.
Pressure30.03 inHg
Wind1.3 mph SE
Humidity66%
Visibility6.2 mi
Dew point49°
Wed, 2860° / 50°0
60 °
San Quentin, Wednesday, 28 October
Overcast. High 60°, low 50°.
Pressure30.00 inHg
Wind6.4 mph W
Humidity73%
Visibility—
Dew point49°
Thu, 2961° / 51°0
61 °
San Quentin, Thursday, 29 October
Overcast. High 61°, low 51°.
Pressure29.97 inHg
Wind6.7 mph W
Humidity68%
Visibility—
Dew point45°
Fri, 3058° / 52°0
58 °
San Quentin, Friday, 30 October
Clear. High 58°, low 52°.
Pressure29.91 inHg
Wind12.1 mph W
Humidity72%
Visibility—
Dew point47°
Sat, 3159° / 53°0
59 °
San Quentin, Saturday, 31 October
Overcast. High 59°, low 53°.
Pressure29.97 inHg
Wind11 mph W
Humidity61%
Visibility—
Dew point44°
Sun, 0161° / 50°0
61 °
San Quentin, Sunday, 1 November
Clear. High 61°, low 50°.
Pressure30.18 inHg
Wind8.8 mph W
Humidity53%
Visibility—
Dew point38°
Mon, 0265° / 54°0
65 °
San Quentin, Monday, 2 November
Clear. High 65°, low 54°.
Pressure30.30 inHg
Wind6.2 mph SW
Humidity58%
Visibility—
Dew point43°
Tue, 0367° / 59°0
67 °
San Quentin, Tuesday, 3 November
Mostly clear. High 67°, low 59°.
Pressure30.30 inHg
Wind7.3 mph NE
Humidity36%
Visibility—
Dew point33°
Wed, 0465° / 58°0
65 °
San Quentin, Wednesday, 4 November
Clear. High 65°, low 58°.
Pressure30.21 inHg
Wind6.4 mph N
Humidity37%
Visibility—
Dew point34°
Thu, 0565° / 58°0
65 °
San Quentin, Thursday, 5 November
Clear. High 65°, low 58°.
Pressure30.00 inHg
Wind9.8 mph SW
Humidity40%
Visibility—
Dew point36°
Fri, 0664° / 61°0.21
64 °
San Quentin, Friday, 6 November
Light rain. High 64°, low 61°.
Pressure30.03 inHg
Wind14.5 mph S
Humidity62%
Visibility—
Dew point50°
Sat, 0763° / 58°0.1
63 °
San Quentin, Saturday, 7 November
Light rain. High 63°, low 58°.
Pressure30.12 inHg
Wind8.3 mph SW
Humidity84%
Visibility—
Dew point57°
From day 17 onward the outlook is built from 60-year climate statistics
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)
Sat, 2159° / 47°0.13
59 °
San Quentin, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high59°
Average low47°
Average precipitation0.13 in
Chance of precipitation27%
Record high69° (2005)
Record low37° (1964)
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.