Monthly outlook for Summer Harbor, ME: average high 52.6°, average low 38.7°. That is 0.3° above the climate normal for October. Precipitation is expected on 3 days (about 1.5 inches), against a normal of 5 days and 2.3 inches. The warmest day looks like 20 October (62.5°), the coolest 21 October (33.2°).
52.6°/38.7°
Average high / low
+0.3°
Above normal
3 / 5
Wet days / normal
1.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
20 October – 29 October
54.3°
52.9°
+0.8°
30 October – 8 November
49.6°
50°
-0.2°
9 November – 18 November
at normal
45.6°
—
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).
Wed, 2158° / 33°0
58 °
Summer Harbor, Wednesday, 21 October
Clear. High 58°, low 33°.
Pressure30.30 inHg
Wind7.1 mph NE
Humidity54%
Visibility6.2 mi
Dew point37°
Thu, 2255° / 37°0
55 °
Summer Harbor, Thursday, 22 October
Overcast. High 55°, low 37°.
Pressure29.85 inHg
Wind10.7 mph N
Humidity55%
Visibility6.2 mi
Dew point38°
Fri, 2351° / 39°0
51 °
Summer Harbor, Friday, 23 October
Partly cloudy. High 51°, low 39°.
Pressure30.24 inHg
Wind13.4 mph N
Humidity51%
Visibility6.2 mi
Dew point30°
Sat, 2452° / 34°0
52 °
Summer Harbor, Saturday, 24 October
Clear. High 52°, low 34°.
Pressure30.50 inHg
Wind4.4 mph NW
Humidity51%
Visibility6.2 mi
Dew point31°
Sun, 2556° / 37°0
56 °
Summer Harbor, Sunday, 25 October
Clear. High 56°, low 37°.
Pressure30.47 inHg
Wind7.9 mph SW
Humidity60%
Visibility—
Dew point38°
Mon, 2659° / 41°0
59 °
Summer Harbor, Monday, 26 October
Overcast. High 59°, low 41°.
Pressure30.24 inHg
Wind8.6 mph N
Humidity66%
Visibility—
Dew point41°
Tue, 2750° / 39°0.04
50 °
Summer Harbor, Tuesday, 27 October
Light rain. High 50°, low 39°.
Pressure30.24 inHg
Wind12.5 mph N
Humidity58%
Visibility—
Dew point34°
Wed, 2845° / 33°0
45 °
Summer Harbor, Wednesday, 28 October
Clear. High 45°, low 33°.
Pressure30.47 inHg
Wind10.5 mph N
Humidity44%
Visibility—
Dew point20°
Thu, 2955° / 46°0.4
55 °
Summer Harbor, Thursday, 29 October
Rain. High 55°, low 46°.
Pressure30.03 inHg
Wind28.2 mph SW
Humidity80%
Visibility—
Dew point44°
Fri, 3045° / 37°0
45 °
Summer Harbor, Friday, 30 October
Clear. High 45°, low 37°.
Pressure29.68 inHg
Wind23.3 mph W
Humidity56%
Visibility—
Dew point28°
Sat, 3147° / 35°0
47 °
Summer Harbor, Saturday, 31 October
Clear. High 47°, low 35°.
Pressure30.18 inHg
Wind23.3 mph W
Humidity51%
Visibility—
Dew point23°
Sun, 0153° / 46°0
53 °
Summer Harbor, Sunday, 1 November
Overcast. High 53°, low 46°.
Pressure30.42 inHg
Wind20.4 mph SW
Humidity68%
Visibility—
Dew point41°
Mon, 0256° / 54°0.99
56 °
Summer Harbor, Monday, 2 November
Rain. High 56°, low 54°.
Pressure30.27 inHg
Wind28.7 mph S
Humidity95%
Visibility—
Dew point53°
Tue, 0356° / 38°0.04
56 °
Summer Harbor, Tuesday, 3 November
Light rain. High 56°, low 38°.
Pressure29.80 inHg
Wind20.8 mph NW
Humidity69%
Visibility—
Dew point42°
Wed, 0441° / 33°0
41 °
Summer Harbor, Wednesday, 4 November
Clear. High 41°, low 33°.
Pressure30.06 inHg
Wind20.9 mph NW
Humidity55%
Visibility—
Dew point23°
From day 17 onward the outlook is built from 60-year climate statistics
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)
Sun, 1545° / 36°0.17
45 °
Summer Harbor, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high45°
Average low36°
Average precipitation0.17 in
Chance of precipitation43%
Record high60° (1994)
Record low19° (2018)
Mon, 1644° / 35°0.17
44 °
Summer Harbor, Monday, 16 November
Climate normal for this date — 60-year average.
Average high44°
Average low35°
Average precipitation0.17 in
Chance of precipitation38%
Record high59° (1989)
Record low19° (2019)
Tue, 1744° / 34°0.13
44 °
Summer Harbor, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high44°
Average low34°
Average precipitation0.13 in
Chance of precipitation28%
Record high60° (2006)
Record low22° (2019)
Wed, 1844° / 34°0.1
44 °
Summer Harbor, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high44°
Average low34°
Average precipitation0.1 in
Chance of precipitation35%
Record high57° (2021)
Record low26° (1997)
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.