Monthly outlook for Summer Harbor, ME: average high 52.3°, average low 38.5°. That is 0.3° below the climate normal for October. Precipitation is expected on 3 days (about 0.5 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 27 October (59.3°), the coolest 29 October (31.9°).
52.3°/38.5°
Average high / low
−0.3°
Below normal
3 / 5
Wet days / normal
0.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
17 October – 26 October
54.8°
53.8°
+0.6°
27 October – 5 November
48°
50.8°
-1.5°
6 November – 15 November
at normal
47°
—
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).
Sun, 1850° / 33°0
50 °
Summer Harbor, Sunday, 18 October
Clear. High 50°, low 33°.
Pressure30.53 inHg
Wind4.1 mph W
Humidity47%
Visibility6.2 mi
Dew point24°
Mon, 1955° / 42°0
55 °
Summer Harbor, Monday, 19 October
Partly cloudy. High 55°, low 42°.
Pressure30.47 inHg
Wind6.2 mph S
Humidity55%
Visibility6.2 mi
Dew point39°
Tue, 2059° / 41°0
59 °
Summer Harbor, Tuesday, 20 October
Overcast. High 59°, low 41°.
Pressure30.27 inHg
Wind9.6 mph N
Humidity49%
Visibility6.2 mi
Dew point39°
Wed, 2154° / 40°0
54 °
Summer Harbor, Wednesday, 21 October
Clear. High 54°, low 40°.
Pressure30.39 inHg
Wind7.6 mph NE
Humidity59%
Visibility—
Dew point35°
Thu, 2257° / 39°0
57 °
Summer Harbor, Thursday, 22 October
Clear. High 57°, low 39°.
Pressure30.09 inHg
Wind9.7 mph N
Humidity64%
Visibility—
Dew point39°
Fri, 2356° / 42°0
56 °
Summer Harbor, Friday, 23 October
Clear. High 56°, low 42°.
Pressure30.18 inHg
Wind16.2 mph N
Humidity50%
Visibility—
Dew point31°
Sat, 2451° / 40°0
51 °
Summer Harbor, Saturday, 24 October
Overcast. High 51°, low 40°.
Pressure30.47 inHg
Wind14.8 mph NE
Humidity64%
Visibility—
Dew point33°
Sun, 2556° / 37°0
56 °
Summer Harbor, Sunday, 25 October
Overcast. High 56°, low 37°.
Pressure30.18 inHg
Wind16.1 mph N
Humidity41%
Visibility—
Dew point25°
Mon, 2658° / 43°0
58 °
Summer Harbor, Monday, 26 October
Clear. High 58°, low 43°.
Pressure30.00 inHg
Wind9.9 mph N
Humidity31%
Visibility—
Dew point22°
Tue, 2759° / 39°0.06
59 °
Summer Harbor, Tuesday, 27 October
Light rain. High 59°, low 39°.
Pressure29.71 inHg
Wind27.9 mph N
Humidity73%
Visibility—
Dew point48°
Wed, 2845° / 35°0
45 °
Summer Harbor, Wednesday, 28 October
Clear. High 45°, low 35°.
Pressure30.21 inHg
Wind27.2 mph N
Humidity58%
Visibility—
Dew point26°
Thu, 2942° / 32°0.25
42 °
Summer Harbor, Thursday, 29 October
Rain. High 42°, low 32°.
Pressure30.18 inHg
Wind16.3 mph SE
Humidity59%
Visibility—
Dew point26°
Fri, 3046° / 41°0.16
46 °
Summer Harbor, Friday, 30 October
Light rain. High 46°, low 41°.
Pressure29.71 inHg
Wind15.9 mph SE
Humidity92%
Visibility—
Dew point42°
Sat, 3147° / 39°0
47 °
Summer Harbor, Saturday, 31 October
Mostly clear. High 47°, low 39°.
Pressure30.15 inHg
Wind14.7 mph N
Humidity69%
Visibility—
Dew point33°
Sun, 0149° / 38°0
49 °
Summer Harbor, Sunday, 1 November
Overcast. High 49°, low 38°.
Pressure30.36 inHg
Wind11.1 mph SW
Humidity67%
Visibility—
Dew point34°
From day 17 onward the outlook is built from 60-year climate statistics
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)
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)
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.