Monthly outlook for Montclair, CA: average high 78.1°, average low 63.2°. That is 0.4° below the climate normal for October. Precipitation is expected on 4 days (about 5.0 inches), against a normal of 1 days and 0.4 inches. The warmest day looks like 22 October (89.4°), the coolest 14 October (48.5°).
78.1°/63.2°
Average high / low
−0.4°
Below normal
4 / 1
Wet days / normal
5.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
12 October – 21 October
78.7°
79.6°
-0.5°
22 October – 31 October
77.3°
76.5°
+0.4°
1 November – 10 November
at normal
73.7°
—
October records over 66 years
104.2°1 October 2020All-time high
34.2°29 October 1971All-time low
Tue, 1365° / 51°0
65 °
Montclair, Tuesday, 13 October
Mostly clear. High 65°, low 51°.
Pressure30.03 inHg
Wind1.2 mph W
Humidity63%
Visibility6.2 mi
Dew point47°
Wed, 1472° / 48°0
72 °
Montclair, Wednesday, 14 October
Clear. High 72°, low 48°.
Pressure30.06 inHg
Wind2.9 mph SW
Humidity38%
Visibility6.2 mi
Dew point44°
Thu, 1581° / 54°0
81 °
Montclair, Thursday, 15 October
Clear. High 81°, low 54°.
Pressure29.97 inHg
Wind2.6 mph S
Humidity40%
Visibility6.2 mi
Dew point51°
Fri, 1685° / 61°0
85 °
Montclair, Friday, 16 October
Clear. High 85°, low 61°.
Pressure29.94 inHg
Wind6.3 mph NE
Humidity39%
Visibility—
Dew point50°
Sat, 1786° / 58°0
86 °
Montclair, Saturday, 17 October
Clear. High 86°, low 58°.
Pressure29.97 inHg
Wind4.7 mph NW
Humidity40%
Visibility—
Dew point50°
Sun, 1888° / 75°0
88 °
Montclair, Sunday, 18 October
Clear. High 88°, low 75°.
Pressure30.00 inHg
Wind11.4 mph SW
Humidity23%
Visibility—
Dew point41°
Mon, 1984° / 72°0
84 °
Montclair, Monday, 19 October
Clear. High 84°, low 72°.
Pressure29.97 inHg
Wind9.9 mph SW
Humidity29%
Visibility—
Dew point44°
Tue, 2079° / 68°0
79 °
Montclair, Tuesday, 20 October
Clear. High 79°, low 68°.
Pressure29.85 inHg
Wind8.5 mph SW
Humidity44%
Visibility—
Dew point51°
Wed, 2186° / 69°0
86 °
Montclair, Wednesday, 21 October
Clear. High 86°, low 69°.
Pressure29.94 inHg
Wind8.6 mph NE
Humidity9%
Visibility—
Dew point16°
Thu, 2289° / 70°0
89 °
Montclair, Thursday, 22 October
Clear. High 89°, low 70°.
Pressure29.97 inHg
Wind6.5 mph NE
Humidity8%
Visibility—
Dew point14°
Fri, 2387° / 75°0
87 °
Montclair, Friday, 23 October
Overcast. High 87°, low 75°.
Pressure29.80 inHg
Wind5.8 mph NE
Humidity8%
Visibility—
Dew point16°
Sat, 2476° / 68°0.15
76 °
Montclair, Saturday, 24 October
Light rain. High 76°, low 68°.
Pressure29.88 inHg
Wind7.9 mph SW
Humidity37%
Visibility—
Dew point46°
Sun, 2578° / 66°0.52
78 °
Montclair, Sunday, 25 October
Rain. High 78°, low 66°.
Pressure29.80 inHg
Wind7.7 mph S
Humidity57%
Visibility—
Dew point56°
Mon, 2668° / 59°3.31
68 °
Montclair, Monday, 26 October
Heavy rain. High 68°, low 59°.
Pressure29.85 inHg
Wind10 mph NW
Humidity78%
Visibility—
Dew point55°
Tue, 2765° / 62°0.03
65 °
Montclair, Tuesday, 27 October
Light rain. High 65°, low 62°.
Pressure29.85 inHg
Wind4.9 mph SE
Humidity60%
Visibility—
Dew point50°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 2876° / 53°0.02
76 °
Montclair, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high76°
Average low53°
Average precipitation0.02 in
Chance of precipitation12%
Record high93° (2008)
Record low44° (1996)
Thu, 2975° / 53°0.01
75 °
Montclair, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high75°
Average low53°
Average precipitation0.01 in
Chance of precipitation8%
Record high91° (1965)
Record low34° (1971)
Fri, 3074° / 53°0.05
74 °
Montclair, Friday, 30 October
Climate normal for this date — 60-year average.
Average high74°
Average low53°
Average precipitation0.05 in
Chance of precipitation20%
Record high91° (1966)
Record low35° (1971)
Sat, 3175° / 53°0.02
75 °
Montclair, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high75°
Average low53°
Average precipitation0.02 in
Chance of precipitation5%
Record high91° (1966)
Record low38° (1971)
Sun, 0176° / 53°0.04
76 °
Montclair, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high76°
Average low53°
Average precipitation0.04 in
Chance of precipitation12%
Record high91° (1997)
Record low42° (1971)
Mon, 0275° / 53°0.02
75 °
Montclair, Monday, 2 November
Climate normal for this date — 60-year average.
Average high75°
Average low53°
Average precipitation0.02 in
Chance of precipitation13%
Record high91° (1997)
Record low43° (1974)
Tue, 0376° / 52°0
76 °
Montclair, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high76°
Average low52°
Average precipitation0 in
Chance of precipitation5%
Record high92° (2010)
Record low42° (1974)
Wed, 0476° / 52°0.03
76 °
Montclair, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high76°
Average low52°
Average precipitation0.03 in
Chance of precipitation5%
Record high92° (2020)
Record low39° (1994)
Thu, 0574° / 52°0.01
74 °
Montclair, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high74°
Average low52°
Average precipitation0.01 in
Chance of precipitation7%
Record high94° (2020)
Record low40° (2011)
Fri, 0673° / 52°0.02
73 °
Montclair, Friday, 6 November
Climate normal for this date — 60-year average.
Average high73°
Average low52°
Average precipitation0.02 in
Chance of precipitation8%
Record high89° (2006)
Record low41° (2011)
Sat, 0772° / 51°0.06
72 °
Montclair, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high72°
Average low51°
Average precipitation0.06 in
Chance of precipitation12%
Record high91° (2006)
Record low37° (2011)
Sun, 0872° / 51°0.09
72 °
Montclair, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high72°
Average low51°
Average precipitation0.09 in
Chance of precipitation22%
Record high90° (2016)
Record low39° (2011)
Mon, 0972° / 51°0.05
72 °
Montclair, Monday, 9 November
Climate normal for this date — 60-year average.
Average high72°
Average low51°
Average precipitation0.05 in
Chance of precipitation12%
Record high90° (2016)
Record low40° (1998)
Tue, 1071° / 50°0.04
71 °
Montclair, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high71°
Average low50°
Average precipitation0.04 in
Chance of precipitation10%
Record high91° (2025)
Record low42° (1966)
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 Montclair, 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 Montclair, 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.