Monthly outlook for South Acton, MA: average high 57.6°, average low 38.4°. That is 2° above the climate normal for October. Precipitation is expected on 3 days (about 0.8 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 26 October (69.2°), the coolest 28 October (23.2°).
57.6°/38.4°
Average high / low
+2°
Above normal
3 / 5
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
26 October – 4 November
59.6°
55.1°
+2.5°
5 November – 14 November
54.2°
50.4°
+2.1°
15 November – 24 November
at normal
45.8°
—
October records over 66 years
85.8°5 October 2007All-time high
23.4°31 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Groton (12 mi).
Tue, 2755° / 31°0
55 °
South Acton, Tuesday, 27 October
Mostly clear. High 55°, low 31°.
Pressure30.39 inHg
Wind3.1 mph N
Humidity52%
Visibility6.2 mi
Dew point30°
Wed, 2857° / 23°0
57 °
South Acton, Wednesday, 28 October
Overcast. High 57°, low 23°.
Pressure30.47 inHg
Wind1.7 mph S
Humidity50%
Visibility6.2 mi
Dew point32°
Thu, 2965° / 43°0
65 °
South Acton, Thursday, 29 October
Clear. High 65°, low 43°.
Pressure30.18 inHg
Wind10.3 mph SW
Humidity61%
Visibility6.2 mi
Dew point48°
Fri, 3069° / 49°0.01
69 °
South Acton, Friday, 30 October
Light rain. High 69°, low 49°.
Pressure30.00 inHg
Wind10.4 mph W
Humidity56%
Visibility6.2 mi
Dew point50°
Sat, 3158° / 42°0
58 °
South Acton, Saturday, 31 October
Overcast. High 58°, low 42°.
Pressure30.33 inHg
Wind10 mph NW
Humidity47%
Visibility—
Dew point32°
Sun, 0161° / 37°0
61 °
South Acton, Sunday, 1 November
Overcast. High 61°, low 37°.
Pressure30.39 inHg
Wind8 mph S
Humidity66%
Visibility—
Dew point42°
Mon, 0254° / 48°0.26
54 °
South Acton, Monday, 2 November
Light rain. High 54°, low 48°.
Pressure30.09 inHg
Wind4.4 mph S
Humidity95%
Visibility—
Dew point51°
Tue, 0355° / 39°0.02
55 °
South Acton, Tuesday, 3 November
Light rain. High 55°, low 39°.
Pressure30.24 inHg
Wind13.5 mph NE
Humidity66%
Visibility—
Dew point37°
Wed, 0452° / 32°0
52 °
South Acton, Wednesday, 4 November
Mostly clear. High 52°, low 32°.
Pressure30.45 inHg
Wind6.6 mph E
Humidity57%
Visibility—
Dew point31°
Thu, 0561° / 43°0.22
61 °
South Acton, Thursday, 5 November
Light rain. High 61°, low 43°.
Pressure30.09 inHg
Wind11.2 mph SE
Humidity84%
Visibility—
Dew point47°
Fri, 0664° / 47°0.32
64 °
South Acton, Friday, 6 November
Rain. High 64°, low 47°.
Pressure29.59 inHg
Wind10.8 mph SE
Humidity87%
Visibility—
Dew point58°
Sat, 0750° / 39°0
50 °
South Acton, Saturday, 7 November
Clear. High 50°, low 39°.
Pressure29.71 inHg
Wind9.5 mph SW
Humidity46%
Visibility—
Dew point26°
Sun, 0846° / 35°0
46 °
South Acton, Sunday, 8 November
Clear. High 46°, low 35°.
Pressure29.88 inHg
Wind8.9 mph W
Humidity52%
Visibility—
Dew point28°
Mon, 0946° / 31°0
46 °
South Acton, Monday, 9 November
Clear. High 46°, low 31°.
Pressure30.06 inHg
Wind6.9 mph NW
Humidity50%
Visibility—
Dew point23°
Tue, 1058° / 39°0
58 °
South Acton, Tuesday, 10 November
Light rain. High 58°, low 39°.
Pressure29.94 inHg
Wind11.9 mph S
Humidity70%
Visibility—
Dew point42°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 1150° / 37°0.11
50 °
South Acton, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.11 in
Chance of precipitation32%
Record high72° (2020)
Record low20° (2017)
Thu, 1249° / 36°0.13
49 °
South Acton, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.13 in
Chance of precipitation37%
Record high72° (2022)
Record low23° (1976)
Fri, 1347° / 34°0.15
47 °
South Acton, Friday, 13 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.15 in
Chance of precipitation38%
Record high68° (1964)
Record low16° (2019)
Sat, 1447° / 34°0.12
47 °
South Acton, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.12 in
Chance of precipitation25%
Record high65° (1973)
Record low9° (1986)
Sun, 1548° / 34°0.12
48 °
South Acton, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.12 in
Chance of precipitation37%
Record high72° (1993)
Record low19° (1967)
Mon, 1648° / 34°0.15
48 °
South Acton, Monday, 16 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.15 in
Chance of precipitation25%
Record high66° (2005)
Record low13° (1967)
Tue, 1747° / 32°0.13
47 °
South Acton, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.13 in
Chance of precipitation30%
Record high64° (2006)
Record low11° (1972)
Wed, 1847° / 33°0.07
47 °
South Acton, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.07 in
Chance of precipitation23%
Record high66° (1963)
Record low23° (2020)
Thu, 1946° / 32°0.06
46 °
South Acton, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.06 in
Chance of precipitation18%
Record high64° (1991)
Record low13° (1986)
Fri, 2046° / 32°0.12
46 °
South Acton, Friday, 20 November
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.12 in
Chance of precipitation33%
Record high68° (1991)
Record low7° (1986)
Sat, 2145° / 31°0.12
45 °
South Acton, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high45°
Average low31°
Average precipitation0.12 in
Chance of precipitation32%
Record high60° (1991)
Record low15° (1967)
Sun, 2244° / 31°0.15
44 °
South Acton, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.15 in
Chance of precipitation38%
Record high62° (1999)
Record low4° (2018)
Mon, 2344° / 30°0.14
44 °
South Acton, Monday, 23 November
Climate normal for this date — 60-year average.
Average high44°
Average low30°
Average precipitation0.14 in
Chance of precipitation25%
Record high66° (1999)
Record low6° (2018)
Tue, 2444° / 31°0.07
44 °
South Acton, Tuesday, 24 November
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.07 in
Chance of precipitation28%
Record high66° (1979)
Record low3° (1989)
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 South Acton, 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 South Acton, 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.