May weather forecast
Pennsylvania, USA

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, Pennsylvania, in May, during 14.4 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. On the first day of May in Philadelphia, Pennsylvania, sunrise is at 5:59 am and sunset at 7:55 pm.
• Pittsburgh - May »
  The month with the most rainfall in Pittsburgh, Pennsylvania, 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 5:51 am and sunset at 8:43 pm EDT.
• Allentown - May »
  On the last day of the month, in Allentown sunrise is at 5:33 am and sunset at 8:26 pm EDT. In Allentown during the entire year, the rain falls for 145.1 days and collects up to 27.24" (692mm) of precipitation.
• Erie - May »
  In Erie during May, the rain falls for 9.3 days and regularly aggregates up to 0.67" (17mm) of precipitation. In Erie, during the entire year, the rain falls for 95.5 days and collects up to 7.17" (182mm) of precipitation.
• Reading - May »
  In Reading, during the entire year, the rain falls for 155.7 days and collects up to 30.83" (783mm) of precipitation. In Reading in May, it is raining for 17.3 days, with typically 2.91" (74mm) of accumulated precipitation.
• Scranton - May »
  In Scranton in May, it is raining for 17.4 days, with typically 2.4" (61mm) of accumulated precipitation. As Scranton moves further into May, the city experiences noticeable improvements in weather conditions with longer, warmer days setting the stage for outdoor activities.
• Bethlehem - May »
  On the last day of May, in Bethlehem sunrise is at 5:32 am and sunset at 8:25 pm EDT. In Bethlehem, during the entire year, snow falls for 26.7 days and aggregates up to 14.49" (368mm) of snow.
• Lancaster - May »
  With an average relative humidity of 81%, May is the most humid month in Lancaster, Pennsylvania. On the first day of May in Lancaster sunrise is at 6:04 am and sunset at 8:00 pm.
• Harrisburg - May »
  On the first day of May in Harrisburg sunrise is at 6:05 am and sunset at 8:03 pm. In Harrisburg, in May, during 13.9 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.
• Altoona - May »
  In Altoona in May, during 17.9 rainfall days, 2.8" (71mm) of precipitation is typically accumulated. In Altoona, during the entire year, snow falls for 58.4 days and aggregates up to 20.59" (523mm) of snow.
• York - May »
  February, May and October, with an average relative humidity of 80%, are most humid months in York, Pennsylvania. In York, during the entire year, the rain falls for 134.1 days and collects up to 17.83" (453mm) of precipitation.
• 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. In State College, during the entire year, snow falls for 59 days and aggregates up to 26.3" (668mm) of snow.