Monthly outlook for Deep River, CT: average high 62.2°, average low 48.1°. That is 0.5° above the climate normal for October. Precipitation is expected on 3 days (about 0.6 inches), against a normal of 4 days and 2.1 inches. The warmest day looks like 13 October (73.1°), the coolest 18 October (38.4°).
62.2°/48.1°
Average high / low
+0.5°
Above normal
3 / 4
Wet days / normal
0.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 October – 17 October
64.9°
62.3°
+1.4°
18 October – 27 October
57.5°
59°
-0.8°
28 October – 6 November
at normal
56.4°
—
October records over 66 years
80.6°2 October 2019All-time high
29.1°31 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Old Lyme (9 mi).
Fri, 0969° / 43°0
69 °
Deep River, Friday, 9 October
Clear. High 69°, low 43°.
Pressure30.09 inHg
Wind11 mph W
Humidity46%
Visibility6.2 mi
Dew point44°
Sat, 1063° / 47°0
63 °
Deep River, Saturday, 10 October
Overcast. High 63°, low 47°.
Pressure30.47 inHg
Wind5.6 mph NW
Humidity49%
Visibility6.2 mi
Dew point42°
Sun, 1165° / 46°0.05
65 °
Deep River, Sunday, 11 October
Light rain. High 65°, low 46°.
Pressure30.42 inHg
Wind7.3 mph S
Humidity59%
Visibility2.3 mi
Dew point49°
Mon, 1264° / 56°0.48
64 °
Deep River, Monday, 12 October
Rain. High 64°, low 56°.
Pressure29.85 inHg
Wind8.4 mph E
Humidity98%
Visibility—
Dew point60°
Tue, 1373° / 54°0.08
73 °
Deep River, Tuesday, 13 October
Light rain. High 73°, low 54°.
Pressure29.74 inHg
Wind15 mph NW
Humidity77%
Visibility—
Dew point60°
Wed, 1456° / 44°0
56 °
Deep River, Wednesday, 14 October
Clear. High 56°, low 44°.
Pressure29.88 inHg
Wind19.1 mph NW
Humidity49%
Visibility—
Dew point32°
Thu, 1556° / 40°0
56 °
Deep River, Thursday, 15 October
Overcast. High 56°, low 40°.
Pressure30.33 inHg
Wind8.1 mph SW
Humidity54%
Visibility—
Dew point34°
Fri, 1667° / 55°0
67 °
Deep River, Friday, 16 October
Overcast. High 67°, low 55°.
Pressure30.18 inHg
Wind15.7 mph SW
Humidity70%
Visibility—
Dew point53°
Sat, 1764° / 45°0
64 °
Deep River, Saturday, 17 October
Partly cloudy. High 64°, low 45°.
Pressure30.09 inHg
Wind17.3 mph NW
Humidity56%
Visibility—
Dew point47°
Sun, 1852° / 38°0
52 °
Deep River, Sunday, 18 October
Overcast. High 52°, low 38°.
Pressure30.50 inHg
Wind9.1 mph N
Humidity49%
Visibility—
Dew point29°
Mon, 1962° / 54°0
62 °
Deep River, Monday, 19 October
Overcast. High 62°, low 54°.
Pressure30.24 inHg
Wind11.4 mph SW
Humidity78%
Visibility—
Dew point52°
Tue, 2053° / 50°0.03
53 °
Deep River, Tuesday, 20 October
Light rain. High 53°, low 50°.
Pressure30.15 inHg
Wind5.9 mph W
Humidity80%
Visibility—
Dew point47°
Wed, 2156° / 48°0
56 °
Deep River, Wednesday, 21 October
Overcast. High 56°, low 48°.
Pressure30.03 inHg
Wind4.5 mph NE
Humidity74%
Visibility—
Dew point44°
Thu, 2260° / 46°0
60 °
Deep River, Thursday, 22 October
Clear. High 60°, low 46°.
Pressure30.06 inHg
Wind6.4 mph SE
Humidity59%
Visibility—
Dew point42°
Fri, 2362° / 51°0
62 °
Deep River, Friday, 23 October
Clear. High 62°, low 51°.
Pressure30.30 inHg
Wind9.7 mph SE
Humidity61%
Visibility—
Dew point46°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 2459° / 49°0.13
59 °
Deep River, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high59°
Average low49°
Average precipitation0.13 in
Chance of precipitation33%
Record high72° (2024)
Record low32° (1969)
Sun, 2559° / 49°0.14
59 °
Deep River, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high59°
Average low49°
Average precipitation0.14 in
Chance of precipitation32%
Record high71° (2021)
Record low39° (1962)
Mon, 2658° / 48°0.15
58 °
Deep River, Monday, 26 October
Climate normal for this date — 60-year average.
Average high58°
Average low48°
Average precipitation0.15 in
Chance of precipitation32%
Record high70° (1971)
Record low35° (2018)
Tue, 2758° / 47°0.15
58 °
Deep River, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high58°
Average low47°
Average precipitation0.15 in
Chance of precipitation23%
Record high71° (1963)
Record low32° (1976)
Wed, 2858° / 47°0.17
58 °
Deep River, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high58°
Average low47°
Average precipitation0.17 in
Chance of precipitation33%
Record high74° (2023)
Record low32° (1976)
Thu, 2956° / 46°0.17
56 °
Deep River, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high56°
Average low46°
Average precipitation0.17 in
Chance of precipitation25%
Record high71° (1984)
Record low33° (1965)
Fri, 3056° / 45°0.15
56 °
Deep River, Friday, 30 October
Climate normal for this date — 60-year average.
Average high56°
Average low45°
Average precipitation0.15 in
Chance of precipitation23%
Record high66° (1971)
Record low35° (2020)
Sat, 3156° / 46°0.07
56 °
Deep River, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high56°
Average low46°
Average precipitation0.07 in
Chance of precipitation23%
Record high72° (2024)
Record low29° (2020)
Sun, 0158° / 47°0.12
58 °
Deep River, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high58°
Average low47°
Average precipitation0.12 in
Chance of precipitation28%
Record high74° (2024)
Record low37° (2010)
Mon, 0257° / 47°0.08
57 °
Deep River, Monday, 2 November
Climate normal for this date — 60-year average.
Average high57°
Average low47°
Average precipitation0.08 in
Chance of precipitation30%
Record high69° (2022)
Record low31° (1965)
Tue, 0357° / 46°0.16
57 °
Deep River, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high57°
Average low46°
Average precipitation0.16 in
Chance of precipitation30%
Record high69° (2017)
Record low35° (1980)
Wed, 0456° / 46°0.04
56 °
Deep River, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high56°
Average low46°
Average precipitation0.04 in
Chance of precipitation27%
Record high68° (1975)
Record low34° (2013)
Thu, 0556° / 46°0.15
56 °
Deep River, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high56°
Average low46°
Average precipitation0.15 in
Chance of precipitation40%
Record high70° (2022)
Record low34° (1965)
Fri, 0655° / 45°0.11
55 °
Deep River, Friday, 6 November
Climate normal for this date — 60-year average.
Average high55°
Average low45°
Average precipitation0.11 in
Chance of precipitation35%
Record high71° (2024)
Record low33° (2012)
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 Deep River, CT 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 Deep River, CT 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.