Monthly outlook for Castine, ME: average high 52.8°, average low 37.4°. That is 0.3° above the climate normal for October. Precipitation is expected on 4 days (about 2.8 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 20 October (61°), the coolest 25 October (31.6°).
52.8°/37.4°
Average high / low
+0.3°
Above normal
4 / 5
Wet days / normal
2.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
54.5°
53.5°
+0.6°
26 October – 4 November
50°
50°
-0°
5 November – 14 November
at normal
46°
—
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).
Sat, 1751° / 35°0
51 °
Castine, Saturday, 17 October
Overcast. High 51°, low 35°.
Pressure29.97 inHg
Wind12.6 mph NW
Humidity49%
Visibility6.2 mi
Dew point28°
Sun, 1852° / 32°0
52 °
Castine, Sunday, 18 October
Clear. High 52°, low 32°.
Pressure30.53 inHg
Wind4.2 mph SW
Humidity46%
Visibility6.2 mi
Dew point25°
Mon, 1956° / 41°0
56 °
Castine, Monday, 19 October
Clear. High 56°, low 41°.
Pressure30.47 inHg
Wind9.6 mph S
Humidity58%
Visibility6.2 mi
Dew point41°
Tue, 2061° / 40°0
61 °
Castine, Tuesday, 20 October
Clear. High 61°, low 40°.
Pressure30.30 inHg
Wind9.1 mph N
Humidity57%
Visibility6.2 mi
Dew point42°
Wed, 2155° / 39°0
55 °
Castine, Wednesday, 21 October
Clear. High 55°, low 39°.
Pressure30.42 inHg
Wind8.2 mph N
Humidity56%
Visibility—
Dew point33°
Thu, 2252° / 37°0
52 °
Castine, Thursday, 22 October
Mostly clear. High 52°, low 37°.
Pressure30.36 inHg
Wind5.9 mph SE
Humidity66%
Visibility—
Dew point37°
Fri, 2357° / 46°0
57 °
Castine, Friday, 23 October
Partly cloudy. High 57°, low 46°.
Pressure30.15 inHg
Wind12.5 mph N
Humidity69%
Visibility—
Dew point44°
Sat, 2451° / 39°0
51 °
Castine, Saturday, 24 October
Clear. High 51°, low 39°.
Pressure30.42 inHg
Wind15.6 mph NE
Humidity55%
Visibility—
Dew point31°
Sun, 2555° / 32°0
55 °
Castine, Sunday, 25 October
Clear. High 55°, low 32°.
Pressure30.45 inHg
Wind10.5 mph N
Humidity43%
Visibility—
Dew point24°
Mon, 2659° / 36°0
59 °
Castine, Monday, 26 October
Clear. High 59°, low 36°.
Pressure30.15 inHg
Wind6.2 mph N
Humidity37%
Visibility—
Dew point25°
Tue, 2754° / 42°0.3
54 °
Castine, Tuesday, 27 October
Rain. High 54°, low 42°.
Pressure29.80 inHg
Wind16.6 mph NW
Humidity63%
Visibility—
Dew point41°
Wed, 2848° / 39°0
48 °
Castine, Wednesday, 28 October
Light rain. High 48°, low 39°.
Pressure29.83 inHg
Wind19 mph NW
Humidity55%
Visibility—
Dew point29°
Thu, 2946° / 33°0
46 °
Castine, Thursday, 29 October
Clear. High 46°, low 33°.
Pressure30.06 inHg
Wind15.6 mph NW
Humidity47%
Visibility—
Dew point20°
Fri, 3047° / 33°1.63
47 °
Castine, Friday, 30 October
Heavy rain. High 47°, low 33°.
Pressure29.80 inHg
Wind18.5 mph E
Humidity93%
Visibility—
Dew point41°
Sat, 3146° / 39°0.34
46 °
Castine, Saturday, 31 October
Rain. High 46°, low 39°.
Pressure29.56 inHg
Wind16.3 mph N
Humidity94%
Visibility—
Dew point38°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0151° / 39°0.11
51 °
Castine, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high51°
Average low39°
Average precipitation0.11 in
Chance of precipitation35%
Record high71° (2024)
Record low28° (1992)
Mon, 0249° / 39°0.17
49 °
Castine, Monday, 2 November
Climate normal for this date — 60-year average.
Average high49°
Average low39°
Average precipitation0.17 in
Chance of precipitation33%
Record high60° (2001)
Record low23° (2002)
Tue, 0349° / 38°0.24
49 °
Castine, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high49°
Average low38°
Average precipitation0.24 in
Chance of precipitation45%
Record high65° (2017)
Record low22° (2002)
Wed, 0449° / 38°0.07
49 °
Castine, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low38°
Average precipitation0.07 in
Chance of precipitation30%
Record high65° (1990)
Record low24° (2020)
Thu, 0549° / 38°0.15
49 °
Castine, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high49°
Average low38°
Average precipitation0.15 in
Chance of precipitation38%
Record high69° (2022)
Record low24° (1965)
Fri, 0648° / 38°0.15
48 °
Castine, Friday, 6 November
Climate normal for this date — 60-year average.
Average high48°
Average low38°
Average precipitation0.15 in
Chance of precipitation40%
Record high72° (2024)
Record low28° (1987)
Sat, 0748° / 37°0.05
48 °
Castine, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high48°
Average low37°
Average precipitation0.05 in
Chance of precipitation25%
Record high71° (2022)
Record low17° (2002)
Sun, 0846° / 35°0.11
46 °
Castine, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.11 in
Chance of precipitation20%
Record high58° (1975)
Record low16° (2002)
Mon, 0946° / 35°0.12
46 °
Castine, Monday, 9 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.12 in
Chance of precipitation30%
Record high65° (2020)
Record low23° (1971)
Tue, 1046° / 35°0.14
46 °
Castine, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.14 in
Chance of precipitation40%
Record high66° (2020)
Record low23° (1965)
Wed, 1146° / 36°0.11
46 °
Castine, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high46°
Average low36°
Average precipitation0.11 in
Chance of precipitation45%
Record high66° (2020)
Record low22° (2017)
Thu, 1245° / 34°0.14
45 °
Castine, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high45°
Average low34°
Average precipitation0.14 in
Chance of precipitation33%
Record high65° (2022)
Record low24° (1976)
Fri, 1343° / 33°0.17
43 °
Castine, Friday, 13 November
Climate normal for this date — 60-year average.
Average high43°
Average low33°
Average precipitation0.17 in
Chance of precipitation37%
Record high59° (1964)
Record low15° (2019)
Sat, 1443° / 32°0.11
43 °
Castine, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high43°
Average low32°
Average precipitation0.11 in
Chance of precipitation40%
Record high57° (2011)
Record low13° (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 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.