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April Weather in Philadelphia, United States

Last updated: June 24, 2025

In April, the average temperature in Philadelphia, United States hovers around 18°C (64°F). Visitors can expect a range that dips to a chilly 1°C (34°F) and peaks at a warm 31°C (88°F). The weather can be quite wet, with 158 mm (6.2 in) of precipitation spread across 9 days, and the air may feel quite humid with an average humidity of 82%. Be prepared for a mix of warmth and rainfall!

April Temperature in Philadelphia

In April in Philadelphia, the average temperature is 18°C (64°F). Maximums can reach 31°C (88°F), and minimums can be as low as 1°C (34°F). Be prepared for a wide range of temperatures, making it essential to pack both warm and light clothing for your travels.

April Weather in Philadelphia: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Philadelphia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Philadelphia, April typically has an average temperature of 18°C (64°F), with highs reaching up to 31°C (88°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec485360647378818077685451
Data source: Temperature data for Philadelphia generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

April Precipitation in Philadelphia

In Philadelphia in April, the precipitation amount is 158 mm (6.2 in) over the course of 9 days.

April Precipitation Trends in Philadelphia

The chart displays monthly precipitation patterns in Philadelphia, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Philadelphia, April typically receives around 158 mm (6.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1101731221581291681071309310668121
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Philadelphia

In Philadelphia in April humidity is 82%. With an average temperature of 18°C (64°F), this humidity feels like a warm, muggy embrace that can make exploring the area feel stifling, leaving travelers drenched in sweat and longing for respite in the shade.

April Average Humidity in Philadelphia

This chart illustrates the average monthly humidity levels in Philadelphia, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Philadelphia is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Philadelphia

In Philadelphia in April, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Philadelphia.

Maximum UV Index Levels in Philadelphia for April

The chart shows the monthly maximum UV Index (UVI) for Philadelphia in April, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In April, the maximum UV index in Philadelphia typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
Data source: Philadelphia April UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How April Weather in Philadelphia Compares to Other Months

Weather in Philadelphia varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Philadelphia, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Philadelphia, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)110 mm (4.3 inches)85%moderate
February Weather11°C (53°F)173 mm (6.8 inches)84%high
March Weather15°C (60°F)121 mm (4.8 inches)82%very high
April Weather18°C (64°F)158 mm (6.2 inches)82%very high
May Weather23°C (73°F)129 mm (5.1 inches)82%extreme
June Weather26°C (79°F)168 mm (6.6 inches)79%extreme
July Weather27°C (81°F)107 mm (4.2 inches)82%extreme
August Weather27°C (80°F)130 mm (5.1 inches)77%extreme
September Weather25°C (77°F)93 mm (3.7 inches)74%very high
October Weather20°C (68°F)106 mm (4.2 inches)73%very high
November Weather12°C (54°F)68 mm (2.7 inches)85%high
December Weather10°C (51°F)121 mm (4.8 inches)88%moderate

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