May weather forecastSaint Marys, WV

May

Weather in May

May, the last month of the spring in Saint Marys, is a moderately hot month, with an average temperature varying between 74.1°F (23.4°C) and 53.4°F (11.9°C).

Temperature

May's onset brings a rise in the average high-temperature, moving from an enjoyable 63.5°F (17.5°C) in April to a warm 74.1°F (23.4°C). In Saint Marys, the May nights cool down to an average low of 53.4°F (11.9°C).

Humidity

In Saint Marys, West Virginia, the average relative humidity in May is 79%.

Rainfall

The month with the most rainfall in Saint Marys is May, when the rain falls for 20 days and typically aggregates up to 3.82" (97mm) of precipitation.

Snowfall

In Saint Marys, West Virginia, snow does not fall in May through September.

Daylight

In Saint Marys, West Virginia, the average length of the day in May is 14h and 22min.
On the first day of May, sunrise is at 6:24 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 5:59 am and sunset at 8:45 pm EDT.

Sunshine

In Saint Marys, the average sunshine in May is 8.7h.

UV index

In Saint Marys, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In May, the maximum UV index of 5 translates into these guidelines:
Exercise prevention - Warding off sunburn is urged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.

Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

An average high-temperature, in May, in Saint Marys, is 74.1°F (23.4°C) and the average low-temperature is 53.4°F (11.9°C).

The average relative humidity in May in Saint Marys, West Virginia, is 79%.

The month with the most rainfall in Saint Marys, West Virginia, is May, when the rain falls for 20 days and typically aggregates up to 3.82" (97mm) of precipitation.

In Saint Marys, West Virginia, in May, it is raining for 20 days, with typically 3.82" (97mm) of accumulated precipitation.

May through September are months without snowfall.

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

In May, the average day length is 14h and 22min.

In May, on the first day of the month, sunrise is at 6:24 am and sunset at 8:18 pm. On the last day of the month, in Saint Marys, sunrise is at 5:59 am and sunset at 8:45 pm EDT.

In May, the average sunshine duration in Saint Marys is 8.7h.

In May, the average daily maximum UV index in Saint Marys, West Virginia, is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A May J J A S O N D

Apr

May

Jun

Average high temperature

63.5°F

74.1°F

81.3°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.1mph

6mph

5.5mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

16.9

17.3

Average snowfall

0.55"

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

10.9

8.5

Average UV index

Average cloud cover

Average visibility

Average temperature in May
Saint Marys, WV

Average high temperature in May: 74.1°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (36.1°F).

Average low temperature in May: 53.4°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 (23.2°F).

Average pressure in May
Saint Marys, 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
Saint Marys, 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
Saint Marys, WV

Average humidity in May: 79%

The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (76%).

Average rainfall in May
Saint Marys, WV

Average rainfall in May: 3.82"

The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is September (2.05").

Average rainfall days in May
Saint Marys, WV

Average rainfall days in May: 20 days

The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is November (10.7 days).

Average snowfall in May
Saint Marys, WV

Average snowfall in May: 0"

The month with the highest snowfall is February (4.84").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in May
Saint Marys, WV

Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (14 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
Saint Marys, WV

Average daylight in May: 14h and 24min

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 42min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).

Average sunshine days in May
Saint Marys, WV

Average sunshine days in May: 8.5 days

The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is May (8.5 days).

Average UV index in May
Saint Marys, 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).