October weather forecast
Old Greenwich, CT

Weather in October

October, like September, in Old Greenwich, Connecticut, is another enjoyable autumn month, with average temperature ranging between min 52°F (11.1°C) and max 62.4°F (16.9°C).

Temperature

In Old Greenwich, Connecticut, the average high-temperature decreases, from an agreeable 73.2°F (22.9°C) in September, to a comfortable 62.4°F (16.9°C). The average low-temperature, in October, is 52°F (11.1°C).

Humidity

In October, the average relative humidity is 74%.

Rainfall

In Old Greenwich, Connecticut, in October, during 13.7 rainfall days, 3.46" (88mm) of precipitation is typically 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 October, the average ocean temperature is 62.2°F (16.8°C).
Note: For swimming, a surface water temperature of 62.2°F (16.8°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

The average length of the day in October is 11.1h.

Sunshine

The average sunshine in October is 5.8h.

UV index

The average daily maximum UV index in October is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in October in Old Greenwich?

The average relative humidity in October in Old Greenwich is 74%.

How many days does it rain in October in Old Greenwich?

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

When it does not snow in Old Greenwich?

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

Does it snow in Old Greenwich 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?

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).

What is the average length of the day in October in Old Greenwich?

In October, the average length of the day in Old Greenwich is 11.1h.

How long on average sun shines in October in Old Greenwich?

The average sunshine in October is 5.8h.

How high is the UV index in October in Old Greenwich?

In October, the average daily maximum UV index in Old Greenwich, Connecticut, is 3. A UV Index reading of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.

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).

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Average pressure in October
Old Greenwich, CT

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

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

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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).

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Average humidity in October
Old Greenwich, CT

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

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

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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").

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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).

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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").
Months with the least snowfall are May, June, July, August, September and October (0").

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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).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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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).

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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: 11.1h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in October: 5.8h

The month with the most sunshine is July (Average sunshine: 10.5h).
Months with the least sunshine are February and December (Average sunshine: 4.7).

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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).

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Average UV index in October
Old Greenwich, CT

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

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

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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).

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Average visibility in October
Old Greenwich, CT

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

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

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