May weather forecast
Pennsylvania, USA

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Flag of Pennsylvania, USA

Weather in May

May in Pennsylvania is a delightful month where spring fully blossoms and introduces hints of the approaching summer. Temperatures typically lie between 47°F (8.3°C) and 67°F (19.4°C), with the state experiencing a consistent warmth that isn't too overpowering. As the month progresses, days become longer, allowing residents and tourists alike to indulge in a plethora of outdoor activities.

Rainfall remains a consistent feature, though May also sees a surge in sunnier days, striking a pleasant balance between showers and sunshine. The rain, however, is scattered and not as continuous as the preceding months, with the occasional thunderstorm thrown into the mix, especially in the latter part of the month. The state's lush greenery is at its peak during this month, with gardens, parks, and natural reserves offering vibrant hues of green, complemented by an array of blooming flowers.

While the southeastern regions of Pennsylvania, influenced by a humid subtropical climate, begin to experience more humid conditions, the areas around Lake Erie and the mountainous regions maintain a slightly cooler profile, especially during the nights. This temperature variation, though not extreme, is noticeable and contributes to the state's diverse weather patterns.

Compared to April's temperate and refreshing climate, May leans more towards warmth, gearing up for the hot summer months that follow. Yet, it is this very transition from the mildness of spring to the warmth of summer that makes May a favorite for many. It offers the best of both seasons, with neither the unpredictability of April nor the intense heat of June, making it one of the most pleasant months to experience Pennsylvania in all its glory.

  • Philadelphia - May »
    In Philadelphia, during the entire year, the rain falls for 127.8 days and collects up to 13.82" (351mm) of precipitation. The months with the highest UV index in Philadelphia are May through August, with an average maximum UV index of 6.
  • Pittsburgh - May »
    The month with the most rainfall in Pittsburgh is May, when the rain falls for 18.9 days and typically aggregates up to 3.07" (78mm) of precipitation. On the last day of the month, in Pittsburgh sunrise is at 5:52 am and sunset at 8:43 pm EDT.
  • Allentown - May »
    In Allentown during May, the rain falls for 16.9 days and regularly aggregates up to 2.76" (70mm) of precipitation. On the first day of May in Allentown sunrise is at 6:00 am and sunset at 7:57 pm.
  • Erie - May »
    On the last day of the month, in Erie sunrise is at 5:47 am and sunset at 8:48 pm EDT. In Erie in May, during 9.3 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.
  • Reading - May »
    In Reading during the entire year, snow falls for 21.1 days and aggregates up to 12.28" (312mm) of snow. On the last day of the month, in Reading sunrise is at 5:36 am and sunset at 8:26 pm EDT.
  • Scranton - May »
    As Scranton moves further into May, the city experiences noticeable improvements in weather conditions with longer, warmer days setting the stage for outdoor activities. During 0.3 snowfall days, in May, Scranton aggregates 0.47" (12mm) of snow.
  • Bethlehem - May »
    In Bethlehem, during May, the rain falls for 17.8 days and regularly aggregates up to 2.72" (69mm) of precipitation. In Bethlehem, during the entire year, snow falls for 26.7 days and aggregates up to 14.49" (368mm) of snow.
  • Lancaster - May »
    May through July, with an average maximum UV index of 6, are months with the highest UV index in Lancaster, Pennsylvania. In Lancaster snow does not fall in May through October.
  • Harrisburg - May »
    On the last day of the month, sunrise is at 5:40 am and sunset at 8:30 pm EDT. In Harrisburg in May, it is raining for 13.9 days, with typically 1.26" (32mm) of accumulated precipitation.
  • Altoona - May »
    On the last day of the month, in Altoona sunrise is at 5:45 am and sunset at 8:36 pm EDT. In Altoona, during May, the rain falls for 17.9 days and regularly aggregates up to 2.8" (71mm) of precipitation.
  • York - May »
    The months with the highest humidity in York are February, May and October, with an average relative humidity of 80%. February, May and October, with an average relative humidity of 80%, are most humid months in York.
  • State College - May »
    In State College, during May, the rain falls for 19.4 days and regularly aggregates up to 3.5" (89mm) of precipitation. May is the last month it regularly snows in State College, Pennsylvania.
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Pennsylvania, USA

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