May weather forecast
West Chester, PA

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A cool summer day over the colorful cityscape of West Chester, Pennsylvania
A cool summer day over the colorful cityscape of West Chester, Pennsylvania

Weather in May

May brings to West Chester genuine spring weather, with days becoming increasingly long and warm. This is the month where trees are in full leaf, flowers bloom profusely and the air is filled with the sweet scent of blossoming flora. As spring melds into early summer, the city sees the highest rainfall of the year, receiving an average of 1.46" (37mm). Consequently, the weather during May remains mostly damp and mild, excellent conditions for plant growth. The heartening sight of the cityscape, draped in vibrant hues and textures, further fuels the spirit of springtime delight.

Temperature

The average high-temperature increases in May, moving from a refreshing 61°F (16.1°C) in April to a pleasant 71.2°F (21.8°C). Throughout the nights in May, an average low-temperature of 54°F (12.2°C) is noted.

Humidity

The average relative humidity in May is 78%.

Rainfall

In West Chester, Pennsylvania, in May, it is raining for 14 days, with typically 1.46" (37mm) of accumulated precipitation. Throughout the year, there are 128.5 rainfall days, and 14.92" (379mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, November and December. May is the last month it regularly snows. During 0.1 snowfall days, in May, West Chester aggregates 0.08" (2mm) of snow. In West Chester, during the entire year, snow falls for 18.1 days and aggregates up to 5.43" (138mm) of snow.

Daylight

The average length of the day in May is 14h and 24min.
On the first day of May, sunrise is at 6:01 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 5:35 am and sunset at 8:24 pm EDT.

Sunshine

In West Chester, the average sunshine in May is 8.3h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 in May interprets into the following advice:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Updated: Aug 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average May temperature?

In West Chester, in May, the average high-temperature is 71.2°F (21.8°C), and the average low-temperature is 54°F (12.2°C).

What is the average humidity in May in West Chester?

The average relative humidity in May is 78%.

How much does it rain in West Chester in May?

In West Chester, Pennsylvania, in May, it is raining for 14 days, with typically 1.46" (37mm) of accumulated precipitation.

What is the last month it snows?

May is the last month it regularly snows. During 0.1 snowfall days, in May, West Chester aggregates 0.08" (2mm) of snow.

What is the average length of the day in May?

The average day length in May in West Chester is 14h and 24min.

What time are sunrise and sunset in May?

On the first day of May, sunrise is at 6:01 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 5:35 am and sunset at 8:24 pm EDT.

How many hours of sunshine does West Chester have in May?

In West Chester, the average sunshine duration in May is 8.3h.

What are the months with the highest UV index in West Chester?

The months with the highest UV index are May through August, with an average maximum UV index of 6.

What is the UV index intensity in May?

The average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.
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
West Chester, PA

Average temperature in May - West Chester, PA
  • Average high temperature in May: 71.2°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in May: 54°F

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (24.4°F).

Average pressure in May
West Chester, PA

Average pressure in May - West Chester, PA
  • Average pressure in May: 30.01"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in May
West Chester, PA

Average wind speed in May - West Chester, PA
  • Average wind speed in May: 6.6mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in May
West Chester, PA

Average humidity in May - West Chester, PA
  • Average humidity in May: 78%

The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in May
West Chester, PA

Average rainfall in May - West Chester, PA
  • Average rainfall in May: 1.46"

The wettest month (with the highest rainfall) is August (2.01").
The driest month (with the least rainfall) is January (0.83").

Average rainfall days in May
West Chester, PA

Average rainfall days in May - West Chester, PA
  • Average rainfall days in May: 14 days

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is January (5.7 days).

Average snowfall in May
West Chester, PA

Average snowfall in May - West Chester, PA
  • Average snowfall in May: 0.08"

The month with the highest snowfall is March (1.54").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in May
West Chester, PA

Average snowfall days in May - West Chester, PA
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is January (5.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in May /
Average sunshine in May
West Chester, PA

Average daylight in May / Average sunshine in May - West Chester, PA
  • Average daylight in May: 14h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in May: 8h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days in May
West Chester, PA

Average sunshine days in May - West Chester, PA
  • Average sunshine days in May: 13.9 days

The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is August (13.1 days).

Average UV index in May
West Chester, PA

Average UV index in May - West Chester, PA
  • Average UV index in May: 6

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in May
West Chester, PA

Average cloud cover in May - West Chester, PA
  • Average cloud cover in May: 48

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in May
West Chester, PA

Average visibility in May - West Chester, PA
  • Average visibility in May: 5mi

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

West Chester, Pennsylvania, USA

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