May 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 May

May in Chatham is a delightful month, as it transitions towards the eagerly awaited summer season. The highest point of temperature climbs to an average of 54.3°F (12.4°C), boosting the bloom of local flora and fauna. This month also signifies a slight decrease in rainfall than April, marking a shift from the showery spring to a much drier summer. The increasingly warm weather coupled with the lengthening days spells out ideal conditions for outdoor recreation. Heading into the end of May, the weather makes further strides towards the summertime, with rising temperatures and dwindling rainfall.

Temperature

Chatham's May weather indicates a minor increase in high-temperatures, edging from April's chilly 46.9°F (8.3°C) to a cool 54.3°F (12.4°C). Chatham logs an average low-temperature of 50.5°F (10.3°C) during the nights of May, subtly lower than its daytime highs.

Humidity

The average relative humidity in May is 84%.

Rainfall

In Chatham, Massachusetts, in May, during 14.6 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. Throughout the year, there are 142.4 rainfall days, and 22.09" (561mm) of precipitation is accumulated.

Snowfall

In Chatham, snow does not fall in May through October.

Ocean temperature

In Chatham, in May, the average water temperature is 48.2°F (9°C).
Note: It is risky to swim in 48.2°F (9°C). Temperatures beneath 50°F (10°C) induce rapid cold shock and hyperventilation.

Daylight

The average length of the day in May in Chatham is 14h and 33min.
On the first day of the month, sunrise is at 5:35 am and sunset at 7:38 pm. On the last day of May, sunrise is at 5:07 am and sunset at 8:07 pm EDT.

Sunshine

The average sunshine in May is 8.4h.

UV index

In May, the average daily maximum UV index in Chatham is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 4 in May interprets into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
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Frequently asked questions

What is the usual temperature for Chatham in May?

In May, the average high-temperature and low-temperature are 54.3°F (12.4°C) and 50.5°F (10.3°C) respectively.

What is the average humidity in May in Chatham?

The average relative humidity in May in Chatham is 84%.

How much does it rain in Chatham in May?

In May, in Chatham, the rain falls for 14.6 days. Throughout May, 1.81" (46mm) of precipitation is accumulated.

When it does not snow in Chatham?

In Chatham, Massachusetts, snow does not fall in May through October.

Does it snow in Chatham in May?

In May, in Chatham, it doesn't snow. April is the latest month when it typically snows.

What is the water temperature in May in Chatham?

In Chatham, Massachusetts, in May, the average water temperature is 48.2°F (9°C). Swimming in 48.2°F (9°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Chatham have in May?

The average day length in May in Chatham is 14h and 33min.

What time are sunrise and sunset in May in Chatham?

On the first day of May, sunrise is at 5:35 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 5:07 am and sunset at 8:07 pm EDT.

How many hours of sunshine does Chatham have in May?

In May, the average sunshine duration is 8.4h.

What is the UV index reading in May in Chatham?

In Chatham, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMayJJASOND
Apr
May
Jun
Average high temperature
46.9°F 8.3°C
54.3°F 12.4°C
63°F 17.2°C
Average low temperature
42.4°F 5.8°C
50.5°F 10.3°C
58.8°F 14.9°C
Average pressure
29.98" 761mmHg
30.02" 763mmHg
29.93" 760mmHg
Average wind speed
15.2mph 24.5km/h
13.2mph 21.2km/h
12.4mph 20km/h
Average max. wind speed
16.2mph 26.1km/h
14mph 22.5km/h
13.1mph 21.1km/h
Average wind speed gusts
26.3mph 42.3km/h
24.2mph 38.9km/h
22.7mph 36.5km/h
Average humidity
80%
84%
85%
Average rainfall
2.05" 52mm
1.81" 46mm
1.69" 43mm
Average rainfall days
13.1
14.6
13.4
Average snowfall
0.04" 1mm
0" 0mm
0" 0mm
Average snowfall days
0.8
0
0
Average sea temperature
43.2°F 6.2°C
48.3°F 9.1°C
56.7°F 13.7°C
Average daylight
13h 2min
14h 4min
15h 1min
Average sunshine
8h 2min
8h 2min
9h 2min
Average sunshine days
14.5
14.8
15.7
Average UV index
3
4
5
Average cloud cover
46%
45%
37%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in May
Chatham, MA

Average temperature in May - Chatham, MA
  • Average high temperature in May: 54.3°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 May: 50.5°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 May
Chatham, MA

Average pressure in May - Chatham, MA
  • Average pressure in May: 30.02"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 May
Chatham, MA

Average wind speed in May - Chatham, MA
  • Average wind speed in May: 13.2mph

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 May
Chatham, MA

Average humidity in May - Chatham, MA
  • Average humidity in May: 84%

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 May
Chatham, MA

Average rainfall in May - Chatham, MA
  • Average rainfall in May: 1.81"

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 May
Chatham, MA

Average rainfall days in May - Chatham, MA
  • Average rainfall days in May: 14.6 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 May
Chatham, MA

Average snowfall in May - Chatham, MA
  • Average snowfall in May: 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 May
Chatham, MA

Average snowfall days in May - Chatham, MA
  • Average snowfall days in May: 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 May
Chatham, MA

Average sea temperature in May - Chatham, MA
  • Average sea temperature in May: 48.3°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 May /
Average sunshine in May
Chatham, MA

Average daylight in May / Average sunshine in May - Chatham, MA
  • Average daylight in May: 14h and 4min

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 May: 8h and 2min

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 May
Chatham, MA

Average sunshine days in May - Chatham, MA
  • Average sunshine days in May: 14.8 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 May
Chatham, MA

Average UV index in May - Chatham, MA
  • Average UV index in May: 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 May
Chatham, MA

Average cloud cover in May - Chatham, MA
  • Average cloud cover in May: 45

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 May
Chatham, MA

Average visibility in May - Chatham, MA
  • Average visibility in May: 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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