Monthly outlook for Castine, ME: average high 51.3°, average low 39.6°. That is 2.4° above the climate normal for October. Precipitation is expected on 5 days (about 1.9 inches), against a normal of 6 days and 2.1 inches. The warmest day looks like 5 November (67.2°), the coolest 15 November (29.6°).
51.3°/39.6°
Average high / low
+2.4°
Above normal
5 / 6
Wet days / normal
1.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
31 October – 9 November
54.6°
48.6°
+3.3°
10 November – 19 November
45.9°
43.4°
+1.4°
20 November – 29 November
at normal
39.8°
—
October records over 66 years
83.1°6 October 2025All-time high
25.7°31 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Swanville (13 mi).
Sun, 0154° / 33°0
54 °
Castine, Sunday, 1 November
Clear. High 54°, low 33°.
Pressure30.36 inHg
Wind7.1 mph W
Humidity48%
Visibility6.2 mi
Dew point31°
Mon, 0261° / 43°0
61 °
Castine, Monday, 2 November
Overcast. High 61°, low 43°.
Pressure30.18 inHg
Wind9.4 mph W
Humidity47%
Visibility6.2 mi
Dew point40°
Tue, 0352° / 44°0.08
52 °
Castine, Tuesday, 3 November
Light rain. High 52°, low 44°.
Pressure30.36 inHg
Wind3.8 mph SE
Humidity78%
Visibility6.2 mi
Dew point45°
Wed, 0455° / 47°0.08
55 °
Castine, Wednesday, 4 November
Light rain. High 55°, low 47°.
Pressure30.24 inHg
Wind8 mph S
Humidity94%
Visibility—
Dew point51°
Thu, 0567° / 49°0
67 °
Castine, Thursday, 5 November
Overcast. High 67°, low 49°.
Pressure30.00 inHg
Wind9.5 mph SW
Humidity70%
Visibility—
Dew point51°
Fri, 0655° / 42°0
55 °
Castine, Friday, 6 November
Clear. High 55°, low 42°.
Pressure30.18 inHg
Wind9.1 mph NE
Humidity70%
Visibility—
Dew point41°
Sat, 0754° / 38°0
54 °
Castine, Saturday, 7 November
Clear. High 54°, low 38°.
Pressure30.21 inHg
Wind5.3 mph N
Humidity64%
Visibility—
Dew point36°
Sun, 0853° / 39°0
53 °
Castine, Sunday, 8 November
Overcast. High 53°, low 39°.
Pressure30.06 inHg
Wind6.4 mph NE
Humidity53%
Visibility—
Dew point32°
Mon, 0946° / 42°0.06
46 °
Castine, Monday, 9 November
Light rain. High 46°, low 42°.
Pressure30.15 inHg
Wind10.1 mph S
Humidity70%
Visibility—
Dew point34°
Tue, 1048° / 43°0.17
48 °
Castine, Tuesday, 10 November
Rain. High 48°, low 43°.
Pressure29.97 inHg
Wind8.4 mph N
Humidity84%
Visibility—
Dew point44°
Wed, 1154° / 42°1.49
54 °
Castine, Wednesday, 11 November
Heavy rain. High 54°, low 42°.
Pressure29.29 inHg
Wind26.6 mph SE
Humidity95%
Visibility—
Dew point48°
Thu, 1245° / 38°0
45 °
Castine, Thursday, 12 November
Partly cloudy. High 45°, low 38°.
Pressure29.26 inHg
Wind22.4 mph W
Humidity58%
Visibility—
Dew point29°
Fri, 1343° / 35°0
43 °
Castine, Friday, 13 November
Mostly clear. High 43°, low 35°.
Pressure29.50 inHg
Wind23.1 mph NW
Humidity55%
Visibility—
Dew point26°
Sat, 1442° / 31°0
42 °
Castine, Saturday, 14 November
Mostly clear. High 42°, low 31°.
Pressure29.88 inHg
Wind15.8 mph NW
Humidity53%
Visibility—
Dew point21°
Sun, 1543° / 30°0
43 °
Castine, Sunday, 15 November
Partly cloudy. High 43°, low 30°.
Pressure29.91 inHg
Wind11.4 mph N
Humidity54%
Visibility—
Dew point22°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 1643° / 32°0.17
43 °
Castine, Monday, 16 November
Climate normal for this date — 60-year average.
Average high43°
Average low32°
Average precipitation0.17 in
Chance of precipitation35%
Record high58° (2008)
Record low14° (2019)
Tue, 1742° / 31°0.12
42 °
Castine, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high42°
Average low31°
Average precipitation0.12 in
Chance of precipitation27%
Record high58° (2006)
Record low19° (1997)
Wed, 1842° / 31°0.09
42 °
Castine, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high42°
Average low31°
Average precipitation0.09 in
Chance of precipitation27%
Record high61° (1987)
Record low19° (1997)
Thu, 1941° / 30°0.09
41 °
Castine, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high41°
Average low30°
Average precipitation0.09 in
Chance of precipitation28%
Record high55° (2017)
Record low15° (2018)
Fri, 2041° / 31°0.14
41 °
Castine, Friday, 20 November
Climate normal for this date — 60-year average.
Average high41°
Average low31°
Average precipitation0.14 in
Chance of precipitation37%
Record high61° (1991)
Record low16° (1986)
Sat, 2141° / 30°0.16
41 °
Castine, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high41°
Average low30°
Average precipitation0.16 in
Chance of precipitation30%
Record high58° (1991)
Record low18° (2022)
Sun, 2240° / 30°0.19
40 °
Castine, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high40°
Average low30°
Average precipitation0.19 in
Chance of precipitation43%
Record high56° (1992)
Record low4° (2018)
Mon, 2339° / 29°0.13
39 °
Castine, Monday, 23 November
Climate normal for this date — 60-year average.
Average high39°
Average low29°
Average precipitation0.13 in
Chance of precipitation28%
Record high61° (1999)
Record low9° (2018)
Tue, 2439° / 29°0.08
39 °
Castine, Tuesday, 24 November
Climate normal for this date — 60-year average.
Average high39°
Average low29°
Average precipitation0.08 in
Chance of precipitation35%
Record high56° (2014)
Record low7° (1989)
Wed, 2539° / 29°0.15
39 °
Castine, Wednesday, 25 November
Climate normal for this date — 60-year average.
Average high39°
Average low29°
Average precipitation0.15 in
Chance of precipitation37%
Record high56° (2014)
Record low13° (1993)
Thu, 2640° / 30°0.19
40 °
Castine, Thursday, 26 November
Climate normal for this date — 60-year average.
Average high40°
Average low30°
Average precipitation0.19 in
Chance of precipitation55%
Record high54° (1979)
Record low11° (1978)
Fri, 2740° / 29°0.19
40 °
Castine, Friday, 27 November
Climate normal for this date — 60-year average.
Average high40°
Average low29°
Average precipitation0.19 in
Chance of precipitation48%
Record high56° (1999)
Record low6° (1978)
Sat, 2840° / 28°0.17
40 °
Castine, Saturday, 28 November
Climate normal for this date — 60-year average.
Average high40°
Average low28°
Average precipitation0.17 in
Chance of precipitation40%
Record high56° (2011)
Record low10° (1987)
Sun, 2939° / 28°0.13
39 °
Castine, Sunday, 29 November
Climate normal for this date — 60-year average.
Average high39°
Average low28°
Average precipitation0.13 in
Chance of precipitation38%
Record high57° (1990)
Record low5° (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 Castine, 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 Castine, 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.