May weather forecast
Onset, MA

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Weather in May

The last month of the spring, May, is a refreshing month in Onset, Massachusetts, with an average temperature varying between 59.5°F (15.3°C) and 50.7°F (10.4°C).

Temperature

The start of May brings a shift in the average high-temperature, increasing from April's fresh 50.5°F (10.3°C) to a moderate 59.5°F (15.3°C). In May, Onset temperatures settle at a low of 50.7°F (10.4°C) during the nights, reflecting a minor change from daytime highs.

Humidity

In May, the average relative humidity is 80%.

Rainfall

In Onset, in May, it is raining for 15.8 days, with typically 2.36" (60mm) of accumulated precipitation. Throughout the year, in Onset, Massachusetts, there are 157.4 rainfall days, and 32.2" (818mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Ocean temperature

In May, the average ocean temperature is 50.4°F (10.2°C).
Note: Beware when you're in 50.4°F (10.2°C) waters; 55.4°F (13°C) is chilling and anything below 50°F (10°C) could cause breathing hindrance and a sudden cold shock, given your physical condition.

Daylight

In May, the average length of the day in Onset, Massachusetts, is 14h and 34min.
On the first day of the month, sunrise is at 5:37 am and sunset at 7:41 pm. On the last day of May, sunrise is at 5:10 am and sunset at 8:10 pm EDT.

Sunshine

The average sunshine in May in Onset is 8.6h.

UV index

The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In May, a daily maximum UV index of 5 leads to the following instructions:
Exercise prevention - Warding off sunburn is urged. To guard against the harmful effects of the Sun, minimize exposure during midday. Enhance your sun protection with tightly woven, yet airy clothing.
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Frequently asked questions

What are the temperatures in Onset in May?

During May, Onset experiences an average high-temperature of 59.5°F (15.3°C) and a low-temperature of 50.7°F (10.4°C).

What is the average humidity in May in Onset?

In Onset, the average relative humidity in May is 80%.

How many days does it rain in May in Onset?

In Onset, in May, during 15.8 rainfall days, 2.36" (60mm) of precipitation is typically accumulated.

When it does not snow in Onset?

May through September are months without snowfall in Onset, Massachusetts.

Does it snow in Onset in May?

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

What is the water temperature in May in Onset?

In Onset, Massachusetts, in May, the average water temperature is 50.4°F (10.2°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.

How many hours of daylight does Onset have in May?

In Onset, Massachusetts, the average day length in May is 14h and 34min.

What time are sunrise and sunset in May in Onset?

In May, on the first day of the month, sunrise is at 5:37 am and sunset at 7:41 pm. On the last day of the month, in Onset, Massachusetts, sunrise is at 5:10 am and sunset at 8:10 pm EDT.

How many hours of sunshine does Onset have in May?

In Onset, Massachusetts, the average sunshine duration in May is 8.6h.

How high is the UV index in May in Onset?

In May, the average daily maximum UV index in Onset, Massachusetts, is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMayJJASOND
Apr
May
Jun
Average high temperature
50.5°F 10.3°C
59.5°F 15.3°C
67.6°F 19.8°C
Average low temperature
41.9°F 5.5°C
50.7°F 10.4°C
58.5°F 14.7°C
Average pressure
29.98" 761mmHg
30.01" 762mmHg
29.93" 760mmHg
Average wind speed
11.7mph 18.8km/h
10.1mph 16.3km/h
9.4mph 15.1km/h
Average max. wind speed
12.4mph 20km/h
10.8mph 17.4km/h
10.1mph 16.3km/h
Average wind speed gusts
19.7mph 31.7km/h
17.7mph 28.5km/h
16.5mph 26.6km/h
Average humidity
76%
80%
81%
Average rainfall
3.03" 77mm
2.36" 60mm
2.52" 64mm
Average rainfall days
15.9
15.8
14.7
Average snowfall
0.24" 6mm
0" 0mm
0" 0mm
Average snowfall days
0.8
0
0
Average sea temperature
44°F 6.7°C
50.4°F 10.2°C
58.6°F 14.8°C
Average daylight
13h 2min
14h 4min
15h 1min
Average sunshine
8h 2min
8h 4min
9h 3min
Average sunshine days
12.5
13.3
13.8
Average UV index
3
5
5
Average cloud cover
45%
43%
37%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in May
Onset, MA

Average temperature in May - Onset, MA
  • Average high temperature in May: 59.5°F

The warmest month (with the highest average high temperature) is July (75.6°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in May: 50.7°F

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

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Average pressure in May
Onset, MA

Average pressure in May - Onset, MA
  • Average pressure in May: 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 May
Onset, MA

Average wind speed in May - Onset, MA
  • Average wind speed in May: 10.1mph

The windiest month (with the highest average wind speed) is January (13.7mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).

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Average humidity in May
Onset, MA

Average humidity in May - Onset, MA
  • Average humidity in May: 80%

The months with the highest relative humidity are June and July (81%).
The months with the lowest relative humidity are March and November (74%).

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Average rainfall in May
Onset, MA

Average rainfall in May - Onset, MA
  • Average rainfall in May: 2.36"

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in May
Onset, MA

Average rainfall days in May - Onset, MA
  • Average rainfall days in May: 15.8 days

The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (9 days).

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Average snowfall in May
Onset, MA

Average snowfall in May - Onset, MA
  • Average snowfall in May: 0"

The months with the highest snowfall are February and March (2.28").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in May
Onset, MA

Average snowfall days in May - Onset, 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 and September (0 days).

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Average sea temperature in May
Onset, MA

Average sea temperature in May - Onset, MA
  • Average sea temperature in May: 50.4°F

The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).

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Average daylight in May /
Average sunshine in May
Onset, MA

Average daylight in May / Average sunshine in May - Onset, 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 4min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

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Average sunshine days in May
Onset, MA

Average sunshine days in May - Onset, MA
  • Average sunshine days in May: 13.3 days

The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is April (12.5 days).

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Average UV index in May
Onset, MA

Average UV index in May - Onset, MA
  • Average UV index in May: 5

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
Onset, MA

Average cloud cover in May - Onset, MA
  • Average cloud cover in May: 43

The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).

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Average visibility in May
Onset, MA

Average visibility in May - Onset, 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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Onset, Massachusetts, USA

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