October weather forecastOld Greenwich, CT
October
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 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: 11h and 6min
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 48min
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: 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: 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: 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: 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).
