Monthly outlook for Harthaven, MA: average high 55.6°, average low 49.1°. That is 1° below the climate normal for October. Precipitation is expected on 3 days (about 0.6 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 27 October (60.7°), the coolest 18 October (41.9°).
55.6°/49.1°
Average high / low
−1°
Below normal
3 / 5
Wet days / normal
0.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
17 October – 26 October
56.2°
58.3°
-1.1°
27 October – 5 November
54.6°
55.8°
-0.7°
6 November – 15 November
at normal
53°
—
October records over 66 years
76.3°5 October 2025All-time high
34.5°24 October 1969All-time low
Climate normals and records are computed from the nearest reference point — Edgartown (5 mi).
Sun, 1851° / 42°0
51 °
Harthaven, Sunday, 18 October
Clear. High 51°, low 42°.
Pressure30.56 inHg
Wind10.1 mph NE
Humidity55%
Visibility6.2 mi
Dew point36°
Mon, 1956° / 50°0
56 °
Harthaven, Monday, 19 October
Mostly clear. High 56°, low 50°.
Pressure30.42 inHg
Wind14 mph NE
Humidity69%
Visibility6.2 mi
Dew point46°
Tue, 2057° / 54°0
57 °
Harthaven, Tuesday, 20 October
Overcast. High 57°, low 54°.
Pressure30.18 inHg
Wind21.5 mph NE
Humidity75%
Visibility6.2 mi
Dew point49°
Wed, 2155° / 53°0
55 °
Harthaven, Wednesday, 21 October
Mostly clear. High 55°, low 53°.
Pressure30.24 inHg
Wind23.8 mph NE
Humidity69%
Visibility—
Dew point45°
Thu, 2255° / 53°0
55 °
Harthaven, Thursday, 22 October
Overcast. High 55°, low 53°.
Pressure30.00 inHg
Wind19.6 mph N
Humidity76%
Visibility—
Dew point47°
Fri, 2356° / 53°0
56 °
Harthaven, Friday, 23 October
Overcast. High 56°, low 53°.
Pressure30.15 inHg
Wind26.2 mph NE
Humidity71%
Visibility—
Dew point44°
Sat, 2455° / 52°0
55 °
Harthaven, Saturday, 24 October
Clear. High 55°, low 52°.
Pressure30.36 inHg
Wind27 mph NE
Humidity66%
Visibility—
Dew point43°
Sun, 2558° / 51°0
58 °
Harthaven, Sunday, 25 October
Overcast. High 58°, low 51°.
Pressure30.15 inHg
Wind24.4 mph N
Humidity62%
Visibility—
Dew point39°
Mon, 2660° / 53°0
60 °
Harthaven, Monday, 26 October
Overcast. High 60°, low 53°.
Pressure30.09 inHg
Wind15.5 mph N
Humidity43%
Visibility—
Dew point34°
Tue, 2761° / 46°0.03
61 °
Harthaven, Tuesday, 27 October
Light rain. High 61°, low 46°.
Pressure29.85 inHg
Wind30.1 mph NW
Humidity81%
Visibility—
Dew point55°
Wed, 2849° / 43°0
49 °
Harthaven, Wednesday, 28 October
Clear. High 49°, low 43°.
Pressure30.30 inHg
Wind25.9 mph NW
Humidity59%
Visibility—
Dew point31°
Thu, 2957° / 48°0.1
57 °
Harthaven, Thursday, 29 October
Light rain. High 57°, low 48°.
Pressure30.18 inHg
Wind19.3 mph S
Humidity52%
Visibility—
Dew point33°
Fri, 3056° / 50°0.28
56 °
Harthaven, Friday, 30 October
Rain. High 56°, low 50°.
Pressure29.59 inHg
Wind30 mph N
Humidity85%
Visibility—
Dew point49°
Sat, 3150° / 46°0.01
50 °
Harthaven, Saturday, 31 October
Light rain. High 50°, low 46°.
Pressure30.18 inHg
Wind17.3 mph NW
Humidity72%
Visibility—
Dew point40°
Sun, 0155° / 48°0
55 °
Harthaven, Sunday, 1 November
Overcast. High 55°, low 48°.
Pressure30.36 inHg
Wind10.6 mph S
Humidity68%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0256° / 49°0.14
56 °
Harthaven, Monday, 2 November
Climate normal for this date — 60-year average.
Average high56°
Average low49°
Average precipitation0.14 in
Chance of precipitation30%
Record high66° (2017)
Record low33° (1965)
Tue, 0356° / 48°0.22
56 °
Harthaven, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high56°
Average low48°
Average precipitation0.22 in
Chance of precipitation37%
Record high66° (2017)
Record low37° (2002)
Wed, 0455° / 48°0.05
55 °
Harthaven, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high55°
Average low48°
Average precipitation0.05 in
Chance of precipitation23%
Record high66° (2022)
Record low35° (2020)
Thu, 0555° / 48°0.17
55 °
Harthaven, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high55°
Average low48°
Average precipitation0.17 in
Chance of precipitation38%
Record high69° (2022)
Record low35° (1965)
Fri, 0655° / 48°0.15
55 °
Harthaven, Friday, 6 November
Climate normal for this date — 60-year average.
Average high55°
Average low48°
Average precipitation0.15 in
Chance of precipitation43%
Record high70° (2022)
Record low37° (2012)
Sat, 0755° / 47°0.08
55 °
Harthaven, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high55°
Average low47°
Average precipitation0.08 in
Chance of precipitation30%
Record high69° (2024)
Record low35° (1962)
Sun, 0854° / 45°0.15
54 °
Harthaven, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high54°
Average low45°
Average precipitation0.15 in
Chance of precipitation28%
Record high68° (2020)
Record low32° (2019)
Mon, 0953° / 46°0.11
53 °
Harthaven, Monday, 9 November
Climate normal for this date — 60-year average.
Average high53°
Average low46°
Average precipitation0.11 in
Chance of precipitation30%
Record high65° (2020)
Record low30° (2019)
Tue, 1054° / 46°0.21
54 °
Harthaven, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high54°
Average low46°
Average precipitation0.21 in
Chance of precipitation43%
Record high64° (2020)
Record low29° (2017)
Wed, 1153° / 46°0.13
53 °
Harthaven, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high53°
Average low46°
Average precipitation0.13 in
Chance of precipitation40%
Record high68° (2022)
Record low27° (2017)
Thu, 1252° / 44°0.18
52 °
Harthaven, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high52°
Average low44°
Average precipitation0.18 in
Chance of precipitation35%
Record high69° (2022)
Record low30° (2017)
Fri, 1351° / 43°0.23
51 °
Harthaven, Friday, 13 November
Climate normal for this date — 60-year average.
Average high51°
Average low43°
Average precipitation0.23 in
Chance of precipitation45%
Record high62° (1975)
Record low23° (2019)
Sat, 1451° / 44°0.12
51 °
Harthaven, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high51°
Average low44°
Average precipitation0.12 in
Chance of precipitation25%
Record high60° (2009)
Record low25° (2019)
Sun, 1552° / 44°0.11
52 °
Harthaven, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high52°
Average low44°
Average precipitation0.11 in
Chance of precipitation32%
Record high63° (2008)
Record low27° (1967)
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 Harthaven, 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 Harthaven, 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.