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April Weather in Islesboro, United States

Last updated: June 24, 2025

In April, the average temperature in Islesboro, United States hovers around 5°C (41°F). Expect chilly days with temperatures dipping to a minimum of -3°C (26°F) and peaking at a comfortable 15°C (59°F). Throughout the month, precipitation is likely, accumulating to 169 mm (6.7 in) over approximately 14 days. With an average humidity of 81%, prepare for a typically damp and cool atmosphere.

April Temperature in Islesboro

In April, in Islesboro, the average temperature is 5°C (41°F). The maximum can reach 15°C (59°F) and the minimum can be as low as -3°C (26°F). Travelers should prepare for a mix of cool and mild weather, making it ideal for layering.

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

The chart illustrates April temperature patterns in Islesboro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Islesboro, April typically has an average temperature of 5°C (41°F), with highs reaching up to 15°C (59°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec282932414957636561534233
Data source: Temperature data for Islesboro 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 Islesboro

In Islesboro in April, the precipitation amount is 169 mm (6.7 in) over a span of 14 days.

April Precipitation Trends in Islesboro

The chart displays monthly precipitation patterns in Islesboro, 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 Islesboro, April typically receives around 169 mm (6.7 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec11210889169114871009099169145160
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Islesboro

In Islesboro in April, humidity is 81%. With an average temperature of 5°C (41°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor exploration uncomfortable and requiring warm, waterproof clothing to stay comfortable while traveling.

April Average Humidity in Islesboro

This chart illustrates the average monthly humidity levels in Islesboro, 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 Islesboro is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%85%81%76%74%74%74%77%82%85%84%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Islesboro

In Islesboro in April, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Islesboro.

Maximum UV Index Levels in Islesboro for April

The chart shows the monthly maximum UV Index (UVI) for Islesboro 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 Islesboro typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: Islesboro 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 Islesboro Compares to Other Months

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

This table compares monthly weather conditions in Islesboro, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)112 mm (4.4 inches)88%low
February Weather-2°C (29°F)108 mm (4.2 inches)88%moderate
March Weather0°C (33°F)89 mm (3.5 inches)85%moderate
April Weather5°C (41°F)169 mm (6.7 inches)81%high
May Weather9°C (49°F)114 mm (4.5 inches)76%very high
June Weather14°C (58°F)87 mm (3.4 inches)74%very high
July Weather17°C (63°F)100 mm (3.9 inches)74%very high
August Weather18°C (65°F)90 mm (3.5 inches)74%very high
September Weather16°C (61°F)99 mm (3.9 inches)77%high
October Weather12°C (54°F)169 mm (6.6 inches)82%moderate
November Weather6°C (42°F)145 mm (5.7 inches)85%moderate
December Weather0°C (33°F)160 mm (6.3 inches)84%low

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