October weather forecast
Old Greenwich, CT

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Weather in October

October takes Old Greenwich through the heart of fall, with noticeable changes in temperature and foliage. The cooler climate encourages residents to embrace the warmth of indoor activities, although the daylight hours remain ample for enjoying the increasingly colorful outdoors. Characteristically, the wind speed picks up providing a gentle reminder of the impending winter. Despite the increased rainfall of 3.46" (88mm), the pleasant days heavily outweigh wet ones. Hints of the upcoming winter start to surface, yet October remains both visually alluring and thermally comforting.

Temperature

During the transition into October, Old Greenwich observes a decrease in the average high-temperature, falling from an agreeable 73.2°F (22.9°C) in September to a refreshing 62.4°F (16.9°C). Old Greenwich's temperature lowers to a mean of 52°F (11.1°C) during the nights in October.

Humidity

In October, the average relative humidity is 74%.

Rainfall

In October, the rain falls for 13.7 days. Throughout October, 3.46" (88mm) of precipitation is accumulated. In Old Greenwich, during the entire year, the rain falls for 166.6 days and collects up to 38.07" (967mm) of precipitation.

Snowfall

In Old Greenwich, snow does not fall in May through October.

Ocean temperature

In Old Greenwich, the average seawater temperature in October is 62.2°F (16.8°C).
Note: When the surface water temperature is 62.2°F (16.8°C), most do not enjoy swimming. Breathing control becomes more complex as temperatures drop below 69.8°F (21°C).

Daylight

The average length of the day in October is 11h and 6min.
On the first day of October, sunrise is at 6:51 am and sunset at 6:35 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:50 pm EDT.

Sunshine

In October, the average sunshine is 5.8h.

UV index

The average daily maximum UV index in October in Old Greenwich is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: In October, the average maximum UV index of 3 translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Updated: Jul 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in October?

October temperatures in Old Greenwich vary between a high-temperature of 62.4°F (16.9°C) and a low-temperature of 52°F (11.1°C). In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is appraised at 86°F (30°C).

What is the average humidity in October?

In October, the average relative humidity is 74%.

How much does it rain in October?

In Old Greenwich, in October, it is raining for 13.7 days, with typically 3.46" (88mm) of accumulated precipitation.

When it does not snow?

May through October are months without snowfall.

Does it snow in October?

In Old Greenwich, Connecticut, in October, it doesn't snow. In November, it regularly snows.

What is the ocean temperature in October?

In Old Greenwich, the average seawater temperature in October is 62.2°F (16.8°C). Swimming in 62.2°F (16.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Old Greenwich have in October?

In Old Greenwich, the average day length in October is 11h and 6min.

When are sunrise and sunset in October?

In October, on the first day of the month, sunrise is at 6:51 am and sunset at 6:35 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:50 pm EDT.

How long on average sun shines in October?

In October, the average sunshine duration is 5.8h.

What is the UV index intensity in October?

In October, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASOctoberND
Sep
October
Nov
Average high temperature
73.2°F 22.9°C
62.4°F 16.9°C
50.9°F 10.5°C
Average low temperature
61.7°F 16.5°C
52°F 11.1°C
40.8°F 4.9°C
Average pressure
30.05" 763mmHg
30.02" 763mmHg
30.09" 764mmHg
Average wind speed
7.6mph 12.2km/h
8.9mph 14.3km/h
9.5mph 15.3km/h
Average max. wind speed
7.8mph 12.6km/h
9.7mph 15.6km/h
10.3mph 16.6km/h
Average wind speed gusts
11.4mph 18.3km/h
13.7mph 22km/h
14.3mph 23km/h
Average humidity
73%
74%
72%
Average rainfall
2.68" 68mm
3.46" 88mm
2.83" 72mm
Average rainfall days
13.3
13.7
10.3
Average snowfall
0" 0mm
0" 0mm
0.24" 6mm
Average snowfall days
0
0
1.1
Average sea temperature
68.9°F 20.5°C
62.2°F 16.8°C
53.8°F 12.1°C
Average daylight
12h 3min
11h 1min
9h 5min
Average sunshine
8h 5min
5h 5min
5h 4min
Average sunshine days
14.8
15.2
17.9
Average UV index
4
3
2
Average cloud cover
35%
42%
38%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in October
Old Greenwich, CT

Average temperature in October - Old Greenwich, CT
  • Average high temperature in October: 62.4°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (36°F).

  • Average low temperature in October: 52°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

Average pressure in October
Old Greenwich, CT

Average pressure in October - Old Greenwich, CT
  • Average pressure in October: 30.02"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in October
Old Greenwich, CT

Average wind speed in October - Old Greenwich, CT
  • Average wind speed in October: 8.9mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

Average humidity in October
Old Greenwich, CT

Average humidity in October - Old Greenwich, CT
  • Average humidity in October: 74%

The months with the highest relative humidity are February, May, June and December (75%).
The month with the lowest relative humidity is August (71%).

Average rainfall in October
Old Greenwich, CT

Average rainfall in October - Old Greenwich, CT
  • Average rainfall in October: 3.46"

The wettest month (with the highest rainfall) is July (4.13").
The driest month (with the least rainfall) is January (2.44").

Average rainfall days in October
Old Greenwich, CT

Average rainfall days in October - Old Greenwich, CT
  • Average rainfall days in October: 13.7 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.6 days).

Average snowfall in October
Old Greenwich, CT

Average snowfall in October - Old Greenwich, CT
  • Average snowfall in October: 0"

The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in October
Old Greenwich, CT

Average snowfall days in October - Old Greenwich, CT
  • Average snowfall days in October: 0 days

The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in October
Old Greenwich, CT

Average sea temperature in October - Old Greenwich, CT
  • Average sea temperature in October: 62.2°F

The best month for swimming (with the highest average sea temperature) is August (73.1°F).
The coldest month (with the lowest average sea temperature) is February (39.5°F).

Average daylight in October /
Average sunshine in October
Old Greenwich, CT

Average daylight in October / Average sunshine in October - Old Greenwich, CT
  • Average daylight in October: 11h and 1min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in October: 5h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).

Average sunshine days in October
Old Greenwich, CT

Average sunshine days in October - Old Greenwich, CT
  • Average sunshine days in October: 15.2 days

The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is June (11.1 days).

Average UV index in October
Old Greenwich, CT

Average UV index in October - Old Greenwich, CT
  • Average UV index in October: 3

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in October
Old Greenwich, CT

Average cloud cover in October - Old Greenwich, CT
  • Average cloud cover in October: 42

The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).

Average visibility in October
Old Greenwich, CT

Average visibility in October - Old Greenwich, CT
  • Average visibility in October: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Old Greenwich, Connecticut, USA

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