May weather forecast
Harrisburg, PA

A church, a mosque, and other buildings along State Street in Harrisburg, Pennsylvania
A church, a mosque, and other buildings along State Street in Harrisburg, Pennsylvania

Weather in May

The last month of the spring, May, is a pleasant month in Harrisburg, Pennsylvania, with temperature in the range of an average low of 51.4°F (10.8°C) and an average high of 70.3°F (21.3°C).

Temperature

In Harrisburg, Pennsylvania, the average high-temperature in May rises, from a moderate 60.1°F (15.6°C) in April, to a pleasant 70.3°F (21.3°C). In May, in Harrisburg, Pennsylvania, the average low-temperature is 51.4°F (10.8°C).

Humidity

In May, the average relative humidity in Harrisburg is 79%.

Rainfall

In Harrisburg, Pennsylvania,, it is raining for 13.9 days, with typically 1.26" (32mm) of accumulated precipitation. Throughout the year, there are 122.3 rainfall days, and 11.73" (298mm) of precipitation is accumulated.

Snowfall

In Harrisburg snow does not fall in May through October.

Daylight

In Harrisburg, the average length of the day is 14.4h.

Sunshine

In Harrisburg, Pennsylvania, the average sunshine in May is 8.5h.

UV index

May through July, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: In May, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in May in Harrisburg?

In Harrisburg, Pennsylvania, the average relative humidity in May is 79%.

How much does it rain in Harrisburg in May?

In May, the rain falls for 13.9 days. Throughout May, 1.26" (32mm) of precipitation is accumulated.

When it does not snow in Harrisburg?

In Harrisburg, Pennsylvania, snow does not fall in May through October.

Does it snow in Harrisburg in May?

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

What is the average length of the day in May in Harrisburg?

In Harrisburg, Pennsylvania, the average length of the day in May is 14.4h.

How long on average sun shines in May in Harrisburg?

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

What are the months with the highest UV index in Harrisburg?

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

How high is the UV index in May in Harrisburg?

In May, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to the UV radiation.

Average temperature in May
Harrisburg, PA

Average temperature in May - Harrisburg, PA
  • Average high temperature in May: 21.3°C

The warmest month (with the highest average high temperature) is July (28.8°C).
The month with the lowest average high temperature is January (1.7°C).

  • Average low temperature in May: 10.8°C

The month with the highest average low temperature is July (17.5°C).
The coldest month (with the lowest average low temperature) is January (-5.5°C).

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Average pressure in May
Harrisburg, PA

Average pressure in May - Harrisburg, PA
  • Average pressure in May: 1016.3mbar

The month with the highest atmospheric pressure is November (1020.4mbar).
The month with the lowest atmospheric pressure is June (1014.1mbar).

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Average wind speed in May
Harrisburg, PA

Average wind speed in May - Harrisburg, PA
  • Average wind speed in May: 10.2km/h

The windiest month (with the highest average wind speed) is March (13.2km/h).
The calmest month (with the lowest average wind speed) is August (7.7km/h).

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Average humidity in May
Harrisburg, PA

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

The month with the highest relative humidity is February (80%).
Months with the lowest relative humidity are March and April (75%).

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Average rainfall in May
Harrisburg, PA

Average rainfall in May - Harrisburg, PA
  • Average rainfall in May: 32mm

The wettest month (with the highest rainfall) is August (33mm).
The driest months (with the least rainfall) are January and February (18mm).

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Average rainfall days in May
Harrisburg, PA

Average rainfall days in May - Harrisburg, PA
  • Average rainfall days in May: 13.9 days

The month with the highest number of rainy days is May (13.9 days).
The month with the least rainy days is January (5.7 days).

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Average snowfall in May
Harrisburg, PA

Average snowfall in May - Harrisburg, PA
  • Average snowfall in May: 0mm

The month with the highest snowfall is February (33mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in May
Harrisburg, PA

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

The month with the highest number of snowfall days is January (6.3 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in May / Average sunshine in May - Harrisburg, PA
  • Average daylight in May: 14.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in May: 8.5h

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.5h).

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Average sunshine days in May
Harrisburg, PA

Average sunshine days in May - Harrisburg, PA
  • Average sunshine days in May: 14.5 days

The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is July (14.1 days).

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Average UV index in May
Harrisburg, PA

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

Months with the highest UV index are May, June and July (UV index 6).
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
Harrisburg, PA

Average cloud cover in May - Harrisburg, PA
  • Average cloud cover in May: 46

Months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in May
Harrisburg, PA

Average visibility in May - Harrisburg, PA
  • Average visibility in May: 8km

Months with the highest visibility are January, February, March, April, June, July, August, October, November and December (9km).
Months with the lowest visibility are May and September (8km).

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