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April Weather in Casco, United States

Last updated: June 24, 2025

In Casco, United States, the average temperature in April hovers around 4°C (39°F). Be prepared for a chilly experience, as temperatures can dip as low as -9°C (17°F), while the warmest days can reach up to 15°C (59°F). During this month, expect about 98 mm (3.9 in) of precipitation over 11 days, contributing to a high average humidity of 84%.

April Temperature in Casco

In April in Casco, the average temperature is 4°C (39°F). The maximum can reach 15°C (59°F), and the minimum can be as low as -9°C (17°F). It's advisable to pack warm clothing and be prepared for chilly weather if you're planning to travel there during this time.

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

The chart illustrates April temperature patterns in Casco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casco, April typically has an average temperature of 4°C (39°F), with highs reaching up to 15°C (59°F) and lows dropping to around -9°C (17°F).
JanFebMarAprMayJunJulAugSepOctNovDec242432394859686963523730
Data source: Temperature data for Casco 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 Casco

In Casco in April, the total precipitation amount is 98 mm (3.9 in) over the course of 11 days.

April Precipitation Trends in Casco

The chart displays monthly precipitation patterns in Casco, 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 Casco, April typically receives around 98 mm (3.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec495868981109910095761156062
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Casco

In Casco in April, humidity is 84%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making outdoor excursions uncomfortable and demanding more layers than you anticipate while traveling.

April Average Humidity in Casco

This chart illustrates the average monthly humidity levels in Casco, 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 Casco is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Casco

In Casco 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 Casco.

Maximum UV Index Levels in Casco for April

The chart shows the monthly maximum UV Index (UVI) for Casco 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 Casco typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Casco 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 Casco Compares to Other Months

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

This table compares monthly weather conditions in Casco, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)49 mm (1.9 inches)89%low
February Weather-5°C (24°F)57 mm (2.3 inches)90%moderate
March Weather0°C (33°F)68 mm (2.7 inches)87%moderate
April Weather4°C (39°F)98 mm (3.9 inches)84%high
May Weather9°C (48°F)110 mm (4.3 inches)77%very high
June Weather15°C (59°F)99 mm (3.9 inches)75%very high
July Weather20°C (68°F)100 mm (3.9 inches)74%very high
August Weather21°C (69°F)95 mm (3.7 inches)73%very high
September Weather17°C (63°F)76 mm (3.0 inches)78%high
October Weather11°C (52°F)115 mm (4.5 inches)84%moderate
November Weather3°C (38°F)60 mm (2.4 inches)89%moderate
December Weather-1°C (30°F)62 mm (2.4 inches)87%low

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