Monthly outlook for Castine, ME: average high 50.2°, average low 39.8°. That is 0.6° above the climate normal for October. Precipitation is expected on 7 days (about 4.5 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 30 October (64.6°), the coolest 28 October (31°).
50.2°/39.8°
Average high / low
+0.6°
Above normal
7 / 5
Wet days / normal
4.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
26 October – 4 November
54.3°
50°
+2.3°
5 November – 14 November
43.4°
46°
-1.5°
15 November – 24 November
at normal
41.2°
—
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).
Tue, 2748° / 37°0
48 °
Castine, Tuesday, 27 October
Clear. High 48°, low 37°.
Pressure30.33 inHg
Wind7.7 mph N
Humidity53%
Visibility6.2 mi
Dew point23°
Wed, 2849° / 31°0
49 °
Castine, Wednesday, 28 October
Overcast. High 49°, low 31°.
Pressure30.45 inHg
Wind4.1 mph SW
Humidity51%
Visibility6.2 mi
Dew point25°
Thu, 2958° / 39°0
58 °
Castine, Thursday, 29 October
Clear. High 58°, low 39°.
Pressure30.12 inHg
Wind7.4 mph S
Humidity59%
Visibility6.2 mi
Dew point42°
Fri, 3065° / 48°0.12
65 °
Castine, Friday, 30 October
Light rain. High 65°, low 48°.
Pressure29.91 inHg
Wind7.5 mph W
Humidity65%
Visibility6.2 mi
Dew point52°
Sat, 3153° / 38°0
53 °
Castine, Saturday, 31 October
Clear. High 53°, low 38°.
Pressure30.27 inHg
Wind10.2 mph NW
Humidity49%
Visibility—
Dew point31°
Sun, 0154° / 36°0
54 °
Castine, Sunday, 1 November
Overcast. High 54°, low 36°.
Pressure30.39 inHg
Wind8.8 mph SW
Humidity56%
Visibility—
Dew point32°
Mon, 0253° / 48°0.22
53 °
Castine, Monday, 2 November
Light rain. High 53°, low 48°.
Pressure30.18 inHg
Wind7.7 mph SW
Humidity78%
Visibility—
Dew point45°
Tue, 0350° / 46°0
50 °
Castine, Tuesday, 3 November
Overcast. High 50°, low 46°.
Pressure30.39 inHg
Wind7.6 mph E
Humidity88%
Visibility—
Dew point46°
Wed, 0450° / 43°0
50 °
Castine, Wednesday, 4 November
Overcast. High 50°, low 43°.
Pressure30.33 inHg
Wind11.6 mph E
Humidity68%
Visibility—
Dew point39°
Thu, 0546° / 43°1.98
46 °
Castine, Thursday, 5 November
Heavy rain. High 46°, low 43°.
Pressure29.85 inHg
Wind14.8 mph N
Humidity95%
Visibility—
Dew point43°
Fri, 0652° / 44°0.12
52 °
Castine, Friday, 6 November
Light rain. High 52°, low 44°.
Pressure29.68 inHg
Wind13.6 mph N
Humidity78%
Visibility—
Dew point42°
Sat, 0746° / 43°0.04
46 °
Castine, Saturday, 7 November
Light rain. High 46°, low 43°.
Pressure29.71 inHg
Wind10.6 mph NE
Humidity80%
Visibility—
Dew point40°
Sun, 0841° / 35°1.19
41 °
Castine, Sunday, 8 November
Snow. High 41°, low 35°.
Pressure29.71 inHg
Wind19.3 mph NE
Humidity92%
Visibility—
Dew point36°
Mon, 0937° / 35°0.75
37 °
Castine, Monday, 9 November
Snow. High 37°, low 35°.
Pressure29.62 inHg
Wind20.1 mph N
Humidity97%
Visibility—
Dew point36°
Tue, 1038° / 34°0.1
38 °
Castine, Tuesday, 10 November
Snow. High 38°, low 34°.
Pressure29.85 inHg
Wind19.2 mph N
Humidity95%
Visibility—
Dew point34°
From day 17 onward the outlook is built from 60-year climate statistics
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)
Sun, 1544° / 33°0.15
44 °
Castine, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high44°
Average low33°
Average precipitation0.15 in
Chance of precipitation38%
Record high59° (1994)
Record low15° (2018)
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)
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.