Monthly outlook for San Quentin, CA: average high 65.3°, average low 55.1°. That is 0.4° below the climate normal for October. Precipitation is expected on 1 day (about 0.4 inches), against a normal of 3 days and 1.0 inches. The warmest day looks like 24 October (75°), the coolest 27 October (45.9°).
65.3°/55.1°
Average high / low
−0.4°
Below normal
1 / 3
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
24 October – 2 November
65.8°
66.9°
-0.6°
3 November – 12 November
64.4°
63.8°
+0.4°
13 November – 22 November
at normal
60.8°
—
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).
Sun, 2570° / 51°0
70 °
San Quentin, Sunday, 25 October
Overcast. High 70°, low 51°.
Pressure30.06 inHg
Wind2.3 mph E
Humidity65%
Visibility4.7 mi
Dew point52°
Mon, 2665° / 49°0
65 °
San Quentin, Monday, 26 October
Partly cloudy. High 65°, low 49°.
Pressure30.15 inHg
Wind5.4 mph NW
Humidity61%
Visibility6.2 mi
Dew point52°
Tue, 2765° / 46°0
65 °
San Quentin, Tuesday, 27 October
Partly cloudy. High 65°, low 46°.
Pressure30.06 inHg
Wind1.7 mph SE
Humidity65%
Visibility6.2 mi
Dew point49°
Wed, 2865° / 49°0
65 °
San Quentin, Wednesday, 28 October
Overcast. High 65°, low 49°.
Pressure29.97 inHg
Wind2.9 mph W
Humidity71%
Visibility—
Dew point48°
Thu, 2962° / 52°0
62 °
San Quentin, Thursday, 29 October
Overcast. High 62°, low 52°.
Pressure29.88 inHg
Wind10.4 mph W
Humidity54%
Visibility—
Dew point44°
Fri, 3060° / 54°0
60 °
San Quentin, Friday, 30 October
Mostly clear. High 60°, low 54°.
Pressure29.94 inHg
Wind7.9 mph SW
Humidity65%
Visibility—
Dew point45°
Sat, 3163° / 53°0
63 °
San Quentin, Saturday, 31 October
Overcast. High 63°, low 53°.
Pressure30.00 inHg
Wind6.7 mph NE
Humidity54%
Visibility—
Dew point40°
Sun, 0166° / 58°0
66 °
San Quentin, Sunday, 1 November
Overcast. High 66°, low 58°.
Pressure30.00 inHg
Wind8.9 mph E
Humidity48%
Visibility—
Dew point40°
Mon, 0266° / 60°0
66 °
San Quentin, Monday, 2 November
Mostly clear. High 66°, low 60°.
Pressure30.12 inHg
Wind7.2 mph SW
Humidity76%
Visibility—
Dew point54°
Tue, 0365° / 60°0
65 °
San Quentin, Tuesday, 3 November
Mostly clear. High 65°, low 60°.
Pressure30.24 inHg
Wind6.5 mph SW
Humidity79%
Visibility—
Dew point56°
Wed, 0465° / 59°0
65 °
San Quentin, Wednesday, 4 November
Overcast. High 65°, low 59°.
Pressure30.06 inHg
Wind4.9 mph W
Humidity77%
Visibility—
Dew point54°
Thu, 0564° / 59°0
64 °
San Quentin, Thursday, 5 November
Overcast. High 64°, low 59°.
Pressure29.97 inHg
Wind9 mph SW
Humidity75%
Visibility—
Dew point53°
Fri, 0663° / 60°0.39
63 °
San Quentin, Friday, 6 November
Rain. High 63°, low 60°.
Pressure30.00 inHg
Wind20 mph S
Humidity94%
Visibility—
Dew point61°
Sat, 0763° / 58°0
63 °
San Quentin, Saturday, 7 November
Overcast. High 63°, low 58°.
Pressure30.18 inHg
Wind5.7 mph SW
Humidity75%
Visibility—
Dew point52°
Sun, 0866° / 59°0
66 °
San Quentin, Sunday, 8 November
Partly cloudy. High 66°, low 59°.
Pressure30.21 inHg
Wind6.4 mph NE
Humidity72%
Visibility—
Dew point52°
From day 17 onward the outlook is built from 60-year climate statistics
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)
Sun, 2260° / 47°0.12
60 °
San Quentin, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high60°
Average low47°
Average precipitation0.12 in
Chance of precipitation30%
Record high69° (2005)
Record low37° (1994)
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.