Monthly outlook for Mill Valley, MA: average high 59.3°, average low 44.4°. That is 0.1° below the climate normal for October. Precipitation is expected on 7 days (about 4.3 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 14 October (71.3°), the coolest 18 October (29.2°).
59.3°/44.4°
Average high / low
−0.1°
Below normal
7 / 5
Wet days / normal
4.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
11 October – 20 October
60.5°
60.3°
+0.1°
21 October – 30 October
57.2°
57°
+0.1°
31 October – 9 November
at normal
53.7°
—
October records over 66 years
85.6°6 October 2007All-time high
22.3°31 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Granby (7 mi).
Mon, 1271° / 46°0.16
71 °
Mill Valley, Monday, 12 October
Rain. High 71°, low 46°.
Pressure29.77 inHg
Wind3.7 mph N
Humidity64%
Visibility6.2 mi
Dew point54°
Tue, 1361° / 50°0.07
61 °
Mill Valley, Tuesday, 13 October
Light rain. High 61°, low 50°.
Pressure30.00 inHg
Wind7.8 mph SE
Humidity88%
Visibility6.2 mi
Dew point53°
Wed, 1471° / 57°0.02
71 °
Mill Valley, Wednesday, 14 October
Light rain. High 71°, low 57°.
Pressure29.83 inHg
Wind7.6 mph NW
Humidity77%
Visibility6.2 mi
Dew point63°
Thu, 1560° / 46°0
60 °
Mill Valley, Thursday, 15 October
Partly cloudy. High 60°, low 46°.
Pressure30.18 inHg
Wind7.9 mph N
Humidity52%
Visibility6.2 mi
Dew point40°
Fri, 1658° / 46°0.8
58 °
Mill Valley, Friday, 16 October
Rain. High 58°, low 46°.
Pressure29.62 inHg
Wind16.5 mph NW
Humidity98%
Visibility—
Dew point52°
Sat, 1745° / 34°0.01
45 °
Mill Valley, Saturday, 17 October
Light rain. High 45°, low 34°.
Pressure30.06 inHg
Wind18.2 mph NW
Humidity57%
Visibility—
Dew point28°
Sun, 1851° / 29°0
51 °
Mill Valley, Sunday, 18 October
Overcast. High 51°, low 29°.
Pressure30.62 inHg
Wind6.8 mph SW
Humidity32%
Visibility—
Dew point14°
Mon, 1964° / 35°0
64 °
Mill Valley, Monday, 19 October
Clear. High 64°, low 35°.
Pressure30.45 inHg
Wind8 mph W
Humidity42%
Visibility—
Dew point29°
Tue, 2068° / 43°0
68 °
Mill Valley, Tuesday, 20 October
Mostly clear. High 68°, low 43°.
Pressure30.30 inHg
Wind5.6 mph NW
Humidity52%
Visibility—
Dew point41°
Wed, 2165° / 45°0
65 °
Mill Valley, Wednesday, 21 October
Mostly clear. High 65°, low 45°.
Pressure30.45 inHg
Wind6.2 mph SE
Humidity64%
Visibility—
Dew point45°
Thu, 2257° / 50°0
57 °
Mill Valley, Thursday, 22 October
Overcast. High 57°, low 50°.
Pressure30.42 inHg
Wind7.6 mph SE
Humidity80%
Visibility—
Dew point49°
Fri, 2362° / 51°2.04
62 °
Mill Valley, Friday, 23 October
Heavy rain. High 62°, low 51°.
Pressure29.88 inHg
Wind20.6 mph SE
Humidity94%
Visibility—
Dew point55°
Sat, 2456° / 47°0.28
56 °
Mill Valley, Saturday, 24 October
Rain. High 56°, low 47°.
Pressure29.29 inHg
Wind13.4 mph NW
Humidity85%
Visibility—
Dew point47°
Sun, 2551° / 45°0.09
51 °
Mill Valley, Sunday, 25 October
Light rain. High 51°, low 45°.
Pressure29.35 inHg
Wind9.1 mph N
Humidity87%
Visibility—
Dew point44°
Mon, 2652° / 42°0
52 °
Mill Valley, Monday, 26 October
Light rain. High 52°, low 42°.
Pressure29.62 inHg
Wind8.7 mph NW
Humidity73%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2756° / 42°0.13
56 °
Mill Valley, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.13 in
Chance of precipitation25%
Record high79° (1963)
Record low28° (1976)
Wed, 2856° / 40°0.17
56 °
Mill Valley, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high56°
Average low40°
Average precipitation0.17 in
Chance of precipitation30%
Record high77° (2023)
Record low26° (1976)
Thu, 2955° / 40°0.14
55 °
Mill Valley, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high55°
Average low40°
Average precipitation0.14 in
Chance of precipitation23%
Record high69° (1989)
Record low29° (1965)
Fri, 3054° / 39°0.12
54 °
Mill Valley, Friday, 30 October
Climate normal for this date — 60-year average.
Average high54°
Average low39°
Average precipitation0.12 in
Chance of precipitation27%
Record high69° (2024)
Record low29° (2011)
Sat, 3155° / 39°0.08
55 °
Mill Valley, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high55°
Average low39°
Average precipitation0.08 in
Chance of precipitation23%
Record high77° (2024)
Record low22° (2020)
Sun, 0156° / 41°0.1
56 °
Mill Valley, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.1 in
Chance of precipitation27%
Record high76° (2024)
Record low30° (1964)
Mon, 0256° / 40°0.09
56 °
Mill Valley, Monday, 2 November
Climate normal for this date — 60-year average.
Average high56°
Average low40°
Average precipitation0.09 in
Chance of precipitation28%
Record high75° (1982)
Record low27° (1965)
Tue, 0356° / 40°0.13
56 °
Mill Valley, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high56°
Average low40°
Average precipitation0.13 in
Chance of precipitation37%
Record high71° (2017)
Record low28° (1980)
Wed, 0454° / 39°0.05
54 °
Mill Valley, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high54°
Average low39°
Average precipitation0.05 in
Chance of precipitation25%
Record high72° (1987)
Record low28° (2020)
Thu, 0554° / 39°0.13
54 °
Mill Valley, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high54°
Average low39°
Average precipitation0.13 in
Chance of precipitation33%
Record high74° (2022)
Record low26° (2002)
Fri, 0652° / 39°0.13
52 °
Mill Valley, Friday, 6 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.13 in
Chance of precipitation38%
Record high76° (2024)
Record low28° (2012)
Sat, 0752° / 38°0.07
52 °
Mill Valley, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high52°
Average low38°
Average precipitation0.07 in
Chance of precipitation23%
Record high71° (2020)
Record low26° (1962)
Sun, 0851° / 37°0.12
51 °
Mill Valley, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.12 in
Chance of precipitation32%
Record high70° (2020)
Record low26° (2019)
Mon, 0951° / 37°0.09
51 °
Mill Valley, Monday, 9 November
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.09 in
Chance of precipitation30%
Record high70° (1975)
Record low23° (2019)
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 Mill Valley, MA 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 Mill Valley, MA 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.