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April Weather in Merrillan, United States

Last updated: June 24, 2025

In Merrillan, United States, the average temperature in April hovers around 6°C (44°F). Expect a chill this time of year, with minimum temperatures dipping as low as -16°C (3°F) and maximums reaching up to 28°C (83°F). With an average precipitation of 95 mm (3.8 in) over 12 days, don't forget your umbrella! The humidity tends to be high, averaging around 85%, making it essential to dress appropriately for comfort.

April Temperature in Merrillan

In April in Merrillan, the average temperature is 6°C (44°F), with maximums that can reach 28°C (83°F) and minimums that can drop to as low as -16°C (3°F). Travelers should prepare for a wide range of temperatures, from chilly to quite warm, making it essential to pack layers for comfort.

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

The chart illustrates April temperature patterns in Merrillan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merrillan, April typically has an average temperature of 6°C (44°F), with highs reaching up to 28°C (83°F) and lows dropping to around -16°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec181934445869726963483425
Data source: Temperature data for Merrillan 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 Merrillan

In Merrillan in April, the precipitation amount is 95 mm (3.8 in) spread over 12 days.

April Precipitation Trends in Merrillan

The chart displays monthly precipitation patterns in Merrillan, 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 Merrillan, April typically receives around 95 mm (3.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec33525695130135112136971195350
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Merrillan

In Merrillan in April, humidity is 85%. With an average temperature of 6°C (44°F), this humidity feels like a chilly dampness that seeps into your clothes, making travel uncomfortable and adding an extra layer of chill to the air.

April Average Humidity in Merrillan

This chart illustrates the average monthly humidity levels in Merrillan, 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 Merrillan is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%86%85%79%80%80%78%80%84%89%85%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Merrillan

In Merrillan in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Merrillan.

Maximum UV Index Levels in Merrillan for April

The chart shows the monthly maximum UV Index (UVI) for Merrillan 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 Merrillan typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24588101097532
Data source: Merrillan 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 Merrillan Compares to Other Months

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

This table compares monthly weather conditions in Merrillan, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)33 mm (1.3 inches)88%low
February Weather-7°C (19°F)52 mm (2.1 inches)89%moderate
March Weather1°C (34°F)56 mm (2.2 inches)86%moderate
April Weather6°C (44°F)95 mm (3.8 inches)85%very high
May Weather15°C (58°F)130 mm (5.1 inches)79%very high
June Weather20°C (69°F)135 mm (5.3 inches)80%very high
July Weather22°C (73°F)112 mm (4.4 inches)80%very high
August Weather20°C (69°F)136 mm (5.4 inches)78%very high
September Weather17°C (63°F)97 mm (3.8 inches)80%high
October Weather9°C (49°F)119 mm (4.7 inches)84%moderate
November Weather1°C (34°F)53 mm (2.1 inches)89%moderate
December Weather-4°C (25°F)50 mm (2.0 inches)85%low

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