As of 02:38 EDT

Weather in Old Lyme, CT

48°

Old Lyme, Monday, 26 October, 02:38

Clear. Feels like 48°. High 69°, low 39°.

Pressure30.33 inHg

Wind0 mph N

Humidity81%

Visibility6.2 mi

Dew point43°

See detailed hourly forecast

Monthly outlook for Old Lyme, CT: average high 55.8°, average low 42.4°. That is 0.1° below the climate normal for October. Precipitation is expected on 5 days (about 1.5 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 30 October (71.7°), the coolest 10 November (34.4°).

55.8°/42.4°

Average high / low

−0.1°

Below normal

5 / 5

Wet days / normal

1.5 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
26 October – 4 November	60°	56.9°	+1.7°
5 November – 14 November	48.8°	53°	-2.4°
15 November – 24 November	at normal	49.3°	—

October records over 66 years

80.6°2 October 2019All-time high

29.1°31 October 2020All-time low

Tue, 2757° / 39°

57 °

Old Lyme, Tuesday, 27 October

Partly cloudy. High 57°, low 39°.

Pressure30.36 inHg

Wind6.4 mph N

Humidity44%

Visibility6.2 mi

Dew point33°

Wed, 2857° / 35°

57 °

Old Lyme, Wednesday, 28 October

Clear. High 57°, low 35°.

Pressure30.45 inHg

Wind3.8 mph SW

Humidity55%

Visibility6.2 mi

Dew point39°

Thu, 2963° / 47°

63 °

Old Lyme, Thursday, 29 October

Partly cloudy. High 63°, low 47°.

Pressure30.27 inHg

Wind9.1 mph SW

Humidity67%

Visibility6.2 mi

Dew point50°

Fri, 3072° / 52°

72 °

Old Lyme, Friday, 30 October

Clear. High 72°, low 52°.

Pressure30.06 inHg

Wind9.9 mph NW

Humidity65%

Visibility—

Dew point51°

Sat, 3160° / 47°

60 °

Old Lyme, Saturday, 31 October

Mostly clear. High 60°, low 47°.

Pressure30.33 inHg

Wind10.3 mph NW

Humidity58%

Visibility—

Dew point42°

Sun, 0156° / 50°

56 °

Old Lyme, Sunday, 1 November

Overcast. High 56°, low 50°.

Pressure30.39 inHg

Wind12.2 mph SW

Humidity56%

Visibility—

Dew point39°

Mon, 0260° / 55°

0.65

60 °

Old Lyme, Monday, 2 November

Rain. High 60°, low 55°.

Pressure30.15 inHg

Wind22.7 mph E

Humidity84%

Visibility—

Dew point53°

Tue, 0359° / 46°

0.43

59 °

Old Lyme, Tuesday, 3 November

Rain. High 59°, low 46°.

Pressure29.68 inHg

Wind16.2 mph NE

Humidity90%

Visibility—

Dew point49°

Wed, 0446° / 38°

0.06

46 °

Old Lyme, Wednesday, 4 November

Light rain. High 46°, low 38°.

Pressure30.15 inHg

Wind14.7 mph NE

Humidity67%

Visibility—

Dew point33°

Thu, 0546° / 37°

46 °

Old Lyme, Thursday, 5 November

Overcast. High 46°, low 37°.

Pressure30.39 inHg

Wind17.5 mph N

Humidity57%

Visibility—

Dew point28°

Fri, 0648° / 37°

48 °

Old Lyme, Friday, 6 November

Overcast. High 48°, low 37°.

Pressure30.39 inHg

Wind11.8 mph NE

Humidity48%

Visibility—

Dew point25°

Sat, 0749° / 37°

49 °

Old Lyme, Saturday, 7 November

Clear. High 49°, low 37°.

Pressure30.27 inHg

Wind11.6 mph SW

Humidity42%

Visibility—

Dew point23°

Sun, 0855° / 48°

0.05

55 °

Old Lyme, Sunday, 8 November

Light rain. High 55°, low 48°.

Pressure30.09 inHg

Wind20.2 mph SW

Humidity58%

Visibility—

Dew point37°

Mon, 0950° / 37°

0.27

50 °

Old Lyme, Monday, 9 November

Light rain. High 50°, low 37°.

Pressure29.77 inHg

Wind22.3 mph NW

Humidity85%

Visibility—

Dew point43°

Tue, 1044° / 34°

44 °

Old Lyme, Tuesday, 10 November

Mostly clear. High 44°, low 34°.

Pressure30.03 inHg

Wind15.9 mph NW

Humidity40%

Visibility—

Dew point18°

From day 17 onward the outlook is built from 60-year climate statistics

Wed, 1153° / 43°

0.16

53 °

Old Lyme, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high53°

Average low43°

Average precipitation0.16 in

Chance of precipitation35%

Record high67° (2022)

Record low23° (2017)

Thu, 1252° / 41°

0.16

52 °

Old Lyme, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high52°

Average low41°

Average precipitation0.16 in

Chance of precipitation38%

Record high71° (2022)

Record low28° (2019)

Fri, 1351° / 40°

0.21

51 °

Old Lyme, Friday, 13 November

Climate normal for this date — 60-year average.

Average high51°

Average low40°

Average precipitation0.21 in

Chance of precipitation40%

Record high65° (1964)

Record low22° (2019)

Sat, 1450° / 40°

0.09

50 °

Old Lyme, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high50°

Average low40°

Average precipitation0.09 in

Chance of precipitation22%

Record high62° (1989)

Record low25° (1986)

Sun, 1551° / 40°

0.13

51 °

Old Lyme, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high51°

Average low40°

Average precipitation0.13 in

Chance of precipitation42%

Record high67° (1993)

Record low24° (1967)

Mon, 1651° / 40°

0.15

51 °

Old Lyme, Monday, 16 November

Climate normal for this date — 60-year average.

Average high51°

Average low40°

Average precipitation0.15 in

Chance of precipitation35%

Record high64° (2001)

Record low23° (1967)

Tue, 1750° / 40°

0.15

50 °

Old Lyme, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high50°

Average low40°

Average precipitation0.15 in

Chance of precipitation28%

Record high65° (2024)

Record low26° (2019)

Wed, 1850° / 40°

0.08

50 °

Old Lyme, Wednesday, 18 November

Climate normal for this date — 60-year average.

Average high50°

Average low40°

Average precipitation0.08 in

Chance of precipitation23%

Record high63° (2024)

Record low27° (2020)

Thu, 1950° / 39°

0.06

50 °

Old Lyme, Thursday, 19 November

Climate normal for this date — 60-year average.

Average high50°

Average low39°

Average precipitation0.06 in

Chance of precipitation23%

Record high62° (2021)

Record low24° (1986)

Fri, 2049° / 39°

0.13

49 °

Old Lyme, Friday, 20 November

Climate normal for this date — 60-year average.

Average high49°

Average low39°

Average precipitation0.13 in

Chance of precipitation32%

Record high64° (1985)

Record low20° (1986)

Sat, 2149° / 38°

0.11

49 °

Old Lyme, Saturday, 21 November

Climate normal for this date — 60-year average.

Average high49°

Average low38°

Average precipitation0.11 in

Chance of precipitation30%

Record high60° (2020)

Record low20° (1987)

Sun, 2248° / 38°

0.15

48 °

Old Lyme, Sunday, 22 November

Climate normal for this date — 60-year average.

Average high48°

Average low38°

Average precipitation0.15 in

Chance of precipitation37%

Record high60° (1994)

Record low15° (2018)

Mon, 2347° / 37°

0.13

47 °

Old Lyme, Monday, 23 November

Climate normal for this date — 60-year average.

Average high47°

Average low37°

Average precipitation0.13 in

Chance of precipitation25%

Record high60° (1992)

Record low15° (2018)

Tue, 2448° / 38°

0.1

48 °

Old Lyme, Tuesday, 24 November

Climate normal for this date — 60-year average.

Average high48°

Average low38°

Average precipitation0.1 in

Chance of precipitation30%

Record high62° (1979)

Record low19° (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 Old Lyme, 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 Old Lyme, 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.