May weather forecast
Bethlehem, PA

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A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania
A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania

Weather in May

May rolls in and Bethlehem is bathed in the warm embrace of spring. The Bethlehem weather in May is punctuated with a high temperature that soars to 69.6°F (20.9°C), initiating a real departure from the previous months. With this change, Bethlehem experiences a considerable increase in daylight hours and diminished snowfall days effectively to none. This sunnier disposition allows for outdoor activities, al fresco dining, picnics, and walks in the park. Unquestionably, the city eagerly immerses itself in the joyous springtime merriments, luxuriating in more revitalizing alignments of the sun.

Temperature

The start of May signals an increase in the average high-temperature, moving from a refreshing 58.6°F (14.8°C) in April to a pleasant 69.6°F (20.9°C). Throughout May, Bethlehem encounters an average temperature drop to a cool 50.5°F (10.3°C).

Humidity

The average relative humidity in May is 79%.

Rainfall

In Bethlehem, in May, during 17.8 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. In Bethlehem, during the entire year, the rain falls for 153 days and collects up to 26.81" (681mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows in Bethlehem. During 0.1 snowfall days, in May, Bethlehem aggregates 0.12" (3mm) of snow. Throughout the year, there are 26.7 snowfall days, and 14.49" (368mm) of snow is accumulated.

Daylight

In Bethlehem, the average length of the day in May is 14h and 28min.
On the first day of the month, sunrise is at 5:59 am and sunset at 7:57 pm. On the last day of May, sunrise is at 5:32 am and sunset at 8:25 pm EDT.

Sunshine

In May, the average sunshine is 8.3h.

UV index

May through July, with an average maximum UV index of 6, are months with the highest UV index in Bethlehem. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.
Note: In May, the average maximum UV index of 6 translates into the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.

Frequently asked questions

What is the average May temperature?

The average high-temperature and low-temperature during May are 69.6°F (20.9°C) and 50.5°F (10.3°C) respectively.

What is the average humidity in May?

In May, the average relative humidity is 79%.

How much does it rain in May?

In Bethlehem, during May, the rain falls for 17.8 days and regularly aggregates up to 2.72" (69mm) of precipitation.

What is the last month it snows?

May is the last month it regularly snows. During 0.1 snowfall days, in May, Bethlehem aggregates 0.12" (3mm) of snow.

How many hours of daylight does Bethlehem have in May?

In May, the average day length is 14h and 28min.

What time are sunrise and sunset in May?

On the first day of May, sunrise is at 5:59 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 5:32 am and sunset at 8:25 pm EDT.

How many hours of sunshine does Bethlehem have in May?

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

When is the highest UV index?

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

What is the UV index intensity in May?

In Bethlehem, the average daily maximum UV index in May is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unprotected exposure to 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
Bethlehem, PA

Average temperature in May - Bethlehem, PA
  • Average high temperature in May: 69.6°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in May: 50.5°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in May
Bethlehem, PA

Average pressure in May - Bethlehem, 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
Bethlehem, PA

Average wind speed in May - Bethlehem, PA
  • Average wind speed in May: 6.2mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in May
Bethlehem, PA

Average humidity in May - Bethlehem, PA
  • Average humidity in May: 79%

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).

Average rainfall in May
Bethlehem, PA

Average rainfall in May - Bethlehem, PA
  • Average rainfall in May: 2.72"

The wettest month (with the highest rainfall) is July (2.91").
The driest month (with the least rainfall) is September (1.57").

Average rainfall days in May
Bethlehem, PA

Average rainfall days in May - Bethlehem, PA
  • Average rainfall days in May: 17.8 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in May
Bethlehem, PA

Average snowfall in May - Bethlehem, PA
  • Average snowfall in May: 0.12"

The month with the highest snowfall is March (4.13").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in May
Bethlehem, PA

Average snowfall days in May - Bethlehem, PA
  • Average snowfall days in May: 0.1 days

The months with the highest number of snowfall days are January and February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May /
Average sunshine in May
Bethlehem, PA

Average daylight in May / Average sunshine in May - Bethlehem, PA
  • Average daylight in May: 14h and 3min

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 18min).

  • Average sunshine in May: 8h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in May
Bethlehem, PA

Average sunshine days in May - Bethlehem, PA
  • Average sunshine days in May: 11 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11 days).

Average UV index in May
Bethlehem, PA

Average UV index in May - Bethlehem, PA
  • Average UV index in May: 6

The months with the highest UV index are May, June and July (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
Bethlehem, PA

Average cloud cover in May - Bethlehem, PA
  • Average cloud cover in May: 48

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in May
Bethlehem, PA

Average visibility in May - Bethlehem, PA
  • Average visibility in May: 5mi

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

Bethlehem, Pennsylvania, USA

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