May weather forecast
Williamstown, WV

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Weather in May

In May, temperatures escalate in Williamstown, West Virginia, as they fluctuate from 53.2°F (11.8°C) to 74.1°F (23.4°C). This period remains devoid of snowfall, contrasting starkly with the 3.19" (81mm) of rainfall, the highest in the year. The characteristic gusty conditions, coupled with prolonged hours of daylight, embrace the cheerfulness of the season. It's the transition month between the blossoming spring and the imminent summer warmth of June.

Temperature

Williamstown's transition into May sees a rise in the average high-temperature, advancing from a refreshing 63.3°F (17.4°C) in April to a moderately hot 74.1°F (23.4°C). In Williamstown, the nighttime temperature averages to a cool 53.2°F (11.8°C) during May.

Humidity

In May, the average relative humidity is 78%.

Rainfall

May is the month with the most rainfall. Rain falls for 18.3 days and accumulates 3.19" (81mm) of precipitation.

Snowfall

In Williamstown, snow does not fall in May through September.

Daylight

In Williamstown, the average length of the day in May is 14h and 22min.
On the first day of May in Williamstown, sunrise is at 6:25 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 6:00 am and sunset at 8:46 pm EDT.

Sunshine

In Williamstown, the average sunshine in May is 8.5h.

UV index

In May, the average daily maximum UV index in Williamstown is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.
Note: The UV index of 5 in May translates into these instructions:
Act with care - The need to guard against sun damage is communicated. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Williamstown in May?

During May, Williamstown experiences an average high-temperature of 74.1°F (23.4°C) and a low-temperature of 53.2°F (11.8°C).

What is the average humidity in May in Williamstown?

In May, the average relative humidity in Williamstown is 78%.

What is the rainiest month in Williamstown?

The month with the most rainfall is May, when the rain falls for 18.3 days and typically aggregates up to 3.19" (81mm) of precipitation.

How many days does it rain in May in Williamstown?

In Williamstown, in May, it is raining for 18.3 days, with typically 3.19" (81mm) of accumulated precipitation.

When it does not snow in Williamstown?

May through September are months without snowfall in Williamstown, West Virginia.

Does it snow in Williamstown in May?

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

How many hours of daylight does Williamstown have in May?

The average day length in May in Williamstown, West Virginia, is 14h and 22min.

When is the sunrise / sunset in May in Williamstown?

On the first day of May in Williamstown, West Virginia, sunrise is at 6:25 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 6:00 am and sunset at 8:46 pm EDT.

How long on average sun shines in May in Williamstown?

In Williamstown, the average sunshine duration in May is 8.5h.

How high is the UV index in May in Williamstown?

In May, the average daily maximum UV index in Williamstown, West Virginia, is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Williamstown, WV

Average temperature in May - Williamstown, WV
  • Average high temperature in May: 74.1°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in May: 53.2°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

Average pressure in May
Williamstown, WV

Average pressure in May - Williamstown, WV
  • Average pressure in May: 30"Hg

The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).

Average wind speed in May
Williamstown, WV

Average wind speed in May - Williamstown, WV
  • Average wind speed in May: 5.5mph

The windiest month (with the highest average wind speed) is February (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

Average humidity in May
Williamstown, WV

Average humidity in May - Williamstown, WV
  • Average humidity in May: 78%

The months with the highest relative humidity are January and February (83%).
The months with the lowest relative humidity are June, July and August (76%).

Average rainfall in May
Williamstown, WV

Average rainfall in May - Williamstown, WV
  • Average rainfall in May: 3.19"

The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is September (1.46").

Average rainfall days in May
Williamstown, WV

Average rainfall days in May - Williamstown, WV
  • Average rainfall days in May: 18.3 days

The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is November (8.4 days).

Average snowfall in May
Williamstown, WV

Average snowfall in May - Williamstown, WV
  • Average snowfall in May: 0"

The month with the highest snowfall is February (2.8").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in May
Williamstown, WV

Average snowfall days in May - Williamstown, WV
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (9.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in May /
Average sunshine in May
Williamstown, WV

Average daylight in May / Average sunshine in May - Williamstown, WV
  • Average daylight in May: 14h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in May: 8h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).

Average sunshine days in May
Williamstown, WV

Average sunshine days in May - Williamstown, WV
  • Average sunshine days in May: 9.8 days

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (9.8 days).

Average UV index in May
Williamstown, WV

Average UV index in May - Williamstown, WV
  • Average UV index in May: 5

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, November and December (UV index 2).

Average cloud cover in May
Williamstown, WV

Average cloud cover in May - Williamstown, WV
  • Average cloud cover in May: 47

The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in May
Williamstown, WV

Average visibility in May - Williamstown, WV
  • Average visibility in May: 5mi

The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).

Williamstown, West Virginia, USA

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