Monthly outlook for Summer Harbor, ME: average high 53.7°, average low 41.2°. That is 0.4° above the climate normal for October. Precipitation is expected on 3 days (about 1.2 inches), against a normal of 5 days and 2.3 inches. The warmest day looks like 20 October (60.2°), the coolest 18 October (33.3°).
53.7°/41.2°
Average high / low
+0.4°
Above normal
3 / 5
Wet days / normal
1.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
54.9°
54.1°
+0.4°
26 October – 4 November
51.7°
51°
+0.4°
5 November – 14 November
at normal
47.5°
—
October records over 66 years
81°3 October 2023All-time high
29.7°24 October 1969All-time low
Climate normals and records are computed from the nearest reference point — Winter Harbor (3 mi).
Sat, 1757° / 35°0.02
57 °
Summer Harbor, Saturday, 17 October
Light rain. High 57°, low 35°.
Pressure29.97 inHg
Wind10.9 mph NW
Humidity54%
Visibility6.2 mi
Dew point30°
Sun, 1851° / 33°0
51 °
Summer Harbor, Sunday, 18 October
Clear. High 51°, low 33°.
Pressure30.53 inHg
Wind4.1 mph W
Humidity47%
Visibility6.2 mi
Dew point25°
Mon, 1955° / 42°0
55 °
Summer Harbor, Monday, 19 October
Overcast. High 55°, low 42°.
Pressure30.50 inHg
Wind6.4 mph S
Humidity57%
Visibility6.2 mi
Dew point40°
Tue, 2060° / 42°0
60 °
Summer Harbor, Tuesday, 20 October
Overcast. High 60°, low 42°.
Pressure30.27 inHg
Wind8.8 mph N
Humidity59%
Visibility6.2 mi
Dew point43°
Wed, 2155° / 41°0
55 °
Summer Harbor, Wednesday, 21 October
Clear. High 55°, low 41°.
Pressure30.39 inHg
Wind8.3 mph NE
Humidity57%
Visibility—
Dew point35°
Thu, 2253° / 39°0
53 °
Summer Harbor, Thursday, 22 October
Clear. High 53°, low 39°.
Pressure30.18 inHg
Wind6.8 mph NE
Humidity65%
Visibility—
Dew point37°
Fri, 2354° / 41°0
54 °
Summer Harbor, Friday, 23 October
Clear. High 54°, low 41°.
Pressure30.24 inHg
Wind15.9 mph N
Humidity60%
Visibility—
Dew point37°
Sat, 2454° / 40°0
54 °
Summer Harbor, Saturday, 24 October
Clear. High 54°, low 40°.
Pressure30.39 inHg
Wind11.6 mph N
Humidity53%
Visibility—
Dew point32°
Sun, 2552° / 44°0
52 °
Summer Harbor, Sunday, 25 October
Overcast. High 52°, low 44°.
Pressure30.09 inHg
Wind10 mph NE
Humidity71%
Visibility—
Dew point39°
Mon, 2646° / 41°0
46 °
Summer Harbor, Monday, 26 October
Overcast. High 46°, low 41°.
Pressure29.77 inHg
Wind27.7 mph NW
Humidity63%
Visibility—
Dew point32°
Tue, 2751° / 38°0
51 °
Summer Harbor, Tuesday, 27 October
Mostly clear. High 51°, low 38°.
Pressure30.18 inHg
Wind14.8 mph NW
Humidity46%
Visibility—
Dew point26°
Wed, 2852° / 43°0
52 °
Summer Harbor, Wednesday, 28 October
Overcast. High 52°, low 43°.
Pressure30.03 inHg
Wind6.8 mph NW
Humidity51%
Visibility—
Dew point30°
Thu, 2953° / 46°0
53 °
Summer Harbor, Thursday, 29 October
Overcast. High 53°, low 46°.
Pressure30.09 inHg
Wind6.9 mph NE
Humidity68%
Visibility—
Dew point40°
Fri, 3053° / 46°0.04
53 °
Summer Harbor, Friday, 30 October
Light rain. High 53°, low 46°.
Pressure30.15 inHg
Wind11.3 mph E
Humidity73%
Visibility—
Dew point43°
Sat, 3155° / 51°0.59
55 °
Summer Harbor, Saturday, 31 October
Rain. High 55°, low 51°.
Pressure29.74 inHg
Wind14.5 mph E
Humidity98%
Visibility—
Dew point54°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0152° / 42°0.11
52 °
Summer Harbor, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high52°
Average low42°
Average precipitation0.11 in
Chance of precipitation32%
Record high73° (2024)
Record low28° (2023)
Mon, 0251° / 42°0.15
51 °
Summer Harbor, Monday, 2 November
Climate normal for this date — 60-year average.
Average high51°
Average low42°
Average precipitation0.15 in
Chance of precipitation33%
Record high60° (1971)
Record low25° (2002)
Tue, 0350° / 41°0.23
50 °
Summer Harbor, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high50°
Average low41°
Average precipitation0.23 in
Chance of precipitation45%
Record high63° (1990)
Record low25° (2002)
Wed, 0450° / 41°0.07
50 °
Summer Harbor, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high50°
Average low41°
Average precipitation0.07 in
Chance of precipitation30%
Record high62° (1990)
Record low27° (2002)
Thu, 0550° / 41°0.15
50 °
Summer Harbor, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high50°
Average low41°
Average precipitation0.15 in
Chance of precipitation38%
Record high64° (2022)
Record low26° (1965)
Fri, 0649° / 41°0.18
49 °
Summer Harbor, Friday, 6 November
Climate normal for this date — 60-year average.
Average high49°
Average low41°
Average precipitation0.18 in
Chance of precipitation45%
Record high68° (2024)
Record low30° (1987)
Sat, 0749° / 40°0.08
49 °
Summer Harbor, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high49°
Average low40°
Average precipitation0.08 in
Chance of precipitation30%
Record high65° (2022)
Record low20° (2002)
Sun, 0848° / 38°0.12
48 °
Summer Harbor, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high48°
Average low38°
Average precipitation0.12 in
Chance of precipitation22%
Record high60° (2025)
Record low19° (2002)
Mon, 0947° / 38°0.11
47 °
Summer Harbor, Monday, 9 November
Climate normal for this date — 60-year average.
Average high47°
Average low38°
Average precipitation0.11 in
Chance of precipitation23%
Record high61° (1975)
Record low25° (1971)
Tue, 1048° / 38°0.15
48 °
Summer Harbor, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high48°
Average low38°
Average precipitation0.15 in
Chance of precipitation42%
Record high59° (2020)
Record low25° (1965)
Wed, 1147° / 38°0.14
47 °
Summer Harbor, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high47°
Average low38°
Average precipitation0.14 in
Chance of precipitation43%
Record high60° (2022)
Record low25° (2017)
Thu, 1246° / 37°0.12
46 °
Summer Harbor, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high46°
Average low37°
Average precipitation0.12 in
Chance of precipitation35%
Record high63° (2022)
Record low26° (1976)
Fri, 1345° / 36°0.18
45 °
Summer Harbor, Friday, 13 November
Climate normal for this date — 60-year average.
Average high45°
Average low36°
Average precipitation0.18 in
Chance of precipitation37%
Record high58° (1982)
Record low19° (2019)
Sat, 1445° / 35°0.13
45 °
Summer Harbor, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high45°
Average low35°
Average precipitation0.13 in
Chance of precipitation40%
Record high57° (2005)
Record low15° (1986)
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 Summer Harbor, ME 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 Summer Harbor, ME 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.