October weather forecast
Chatham, MA

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The calm blue water and white sand on a typical beach in Cape Cod, with a visible path and a far view of the high Chatham Lighthouse, Massachusetts
The calm blue water and white sand on a typical beach in Cape Cod, with a visible path and a far view of the high Chatham Lighthouse, Massachusetts

Weather in October

October in Chatham is emblematic of the full arrival of autumn, characterized by falling temperatures and vibrant fall colors. Although temperatures drop down from September, weather in October stays rather comfortable with 59.5°F (15.3°C) as the highest average. This month particularly draws attention due to a sudden increase in rainfall that reaches 2.83" (72mm). The landscape transforms with beautiful fall foliage, reflecting the vibrant shades of autumn in its glory. As October gradually transitions into November, temperatures continue to decrease, propelling the town of Chatham towards the colder end of the annual climate spectrum.

Temperature

The shift from September to October includes a minor decrease in the average high-temperature, lightly dropping from 66.6°F (19.2°C) to a still refreshing 59.5°F (15.3°C). Chatham observes a minimal variance in temperature, with a consistent average low of 54.9°F (12.7°C) during the nights of October.

Humidity

In October, the average relative humidity is 77%.

Rainfall

October is the month with the most rainfall in Chatham. Rain falls for 13.4 days and accumulates 2.83" (72mm) of precipitation.

Snowfall

May through October are months without snowfall in Chatham, Massachusetts.

Ocean temperature

In Chatham, Massachusetts, the average seawater temperature in October is 58.3°F (14.6°C).
Note: While a brief time in 58.3°F (14.6°C) at 55.4°F (13°C) is already bracing, plunging below 50°F (10°C) can severely affect breathing and introduce a cold shock, relying on your physical state.

Daylight

In Chatham, the average length of the day in October is 11h and 4min.
On the first day of October, sunrise is at 6:37 am and sunset at 6:21 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:35 pm EDT.

Sunshine

The average sunshine in October is 6.6h.

UV index

In Chatham, Massachusetts, the average daily maximum UV index in October is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: An average maximum UV index of 4 in October leads to these recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
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Frequently asked questions

What is the temperature in October in Chatham?

In October, in Chatham, the average high-temperature is 59.5°F (15.3°C), and the average low-temperature is 54.9°F (12.7°C).

What is the average humidity in October in Chatham?

In Chatham, Massachusetts, the average relative humidity in October is 77%.

What is the wettest month in Chatham?

The month with the most rainfall in Chatham, Massachusetts, is October, when the rain falls for 13.4 days and typically aggregates up to 2.83" (72mm) of precipitation.

How many days does it rain in October in Chatham?

In Chatham, in October, during 13.4 rainfall days, 2.83" (72mm) of precipitation is typically accumulated.

When it does not snow in Chatham?

May through October are months without snowfall in Chatham, Massachusetts.

Does it snow in Chatham in October?

In Chatham, Massachusetts, in October, it doesn't snow. In November, it regularly snows.

How cold is the water in October in Chatham?

In Chatham, in October, the average water temperature is 58.3°F (14.6°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in October in Chatham?

In October, the average day length in Chatham, Massachusetts, is 11h and 4min.

What time are sunrise and sunset in October in Chatham?

On the first day of October, sunrise is at 6:37 am and sunset at 6:21 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:35 pm EDT.

How many hours of sunshine does Chatham have in October?

In Chatham, the average sunshine duration in October is 6.6h.

What is the UV index intensity in October in Chatham?

The average daily maximum UV index in October is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASOctoberND
Sep
October
Nov
Average high temperature
66.6°F 19.2°C
59.5°F 15.3°C
51.3°F 10.7°C
Average low temperature
63.3°F 17.4°C
54.9°F 12.7°C
45.5°F 7.5°C
Average pressure
30.05" 763mmHg
30.01" 762mmHg
30.06" 764mmHg
Average wind speed
13.5mph 21.7km/h
15.5mph 24.9km/h
16.9mph 27.2km/h
Average max. wind speed
13.9mph 22.4km/h
16.5mph 26.6km/h
17.9mph 28.8km/h
Average wind speed gusts
21.4mph 34.4km/h
24.2mph 38.9km/h
25mph 40.2km/h
Average humidity
80%
77%
74%
Average rainfall
1.85" 47mm
2.83" 72mm
1.46" 37mm
Average rainfall days
10.7
13.4
11.5
Average snowfall
0" 0mm
0" 0mm
0.04" 1mm
Average snowfall days
0
0
0.6
Average sea temperature
63.8°F 17.7°C
58.3°F 14.6°C
50.8°F 10.4°C
Average daylight
12h 3min
11h 1min
9h 5min
Average sunshine
8h 3min
6h 4min
5h 1min
Average sunshine days
16.9
15.5
14.9
Average UV index
4
4
2
Average cloud cover
32%
41%
45%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in October
Chatham, MA

Average temperature in October - Chatham, MA
  • Average high temperature in October: 59.5°F

The warmest month (with the highest average high temperature) is August (71.6°F).
The months with the lowest average high temperature are January and February (39°F).

  • Average low temperature in October: 54.9°F

The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (31.6°F).

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Average pressure in October
Chatham, MA

Average pressure in October - Chatham, MA
  • Average pressure in October: 30.01"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in October
Chatham, MA

Average wind speed in October - Chatham, MA
  • Average wind speed in October: 15.5mph

The windiest month (with the highest average wind speed) is January (18mph).
The calmest month (with the lowest average wind speed) is August (11.4mph).

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Average humidity in October
Chatham, MA

Average humidity in October - Chatham, MA
  • Average humidity in October: 77%

The months with the highest relative humidity are June and July (85%).
The month with the lowest relative humidity is November (74%).

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Average rainfall in October
Chatham, MA

Average rainfall in October - Chatham, MA
  • Average rainfall in October: 2.83"

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is November (1.46").

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Average rainfall days in October
Chatham, MA

Average rainfall days in October - Chatham, MA
  • Average rainfall days in October: 13.4 days

The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is February (8.3 days).

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Average snowfall in October
Chatham, MA

Average snowfall in October - Chatham, MA
  • Average snowfall in October: 0"

The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in October
Chatham, MA

Average snowfall days in October - Chatham, MA
  • Average snowfall days in October: 0 days

The month with the highest number of snowfall days is January (6 days).
The 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
Chatham, MA

Average sea temperature in October - Chatham, MA
  • Average sea temperature in October: 58.3°F

The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is March (39.8°F).

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Average daylight in October /
Average sunshine in October
Chatham, MA

Average daylight in October / Average sunshine in October - Chatham, MA
  • Average daylight in October: 11h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in October: 6h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

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Average sunshine days in October
Chatham, MA

Average sunshine days in October - Chatham, MA
  • Average sunshine days in October: 15.5 days

The month with the most sunshine days is August (17.6 days).
The month with the least sunshine days is January (13 days).

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Average UV index in October
Chatham, MA

Average UV index in October - Chatham, MA
  • Average UV index in October: 4

The months with the highest UV index are July and August (UV index 6).
The 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
Chatham, MA

Average cloud cover in October - Chatham, MA
  • Average cloud cover in October: 41

The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in October
Chatham, MA

Average visibility in October - Chatham, MA
  • 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).

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Chatham, Massachusetts, USA

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