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March Weather in Merrillan, United States

Last updated: June 24, 2025

In March, the average temperature in Merrillan, United States hovers around 1°C (34°F). Expect chilly conditions, with minimums dropping to -25°C (-14°F) and maximums reaching a mild 19°C (67°F). While you're out and about, be prepared for 56 mm (2.2 in) of precipitation over 8 days, and a high average humidity of 86% that adds to the winter chill.

March Temperature in Merrillan

In March in Merrillan, the average temperature is 1°C (34°F). Maximum temperatures can reach 19°C (67°F) while minimum temperatures can drop as low as -25°C (-14°F). This means travelers should be prepared for a wide range of weather conditions, from chilly days to surprisingly warm afternoons.

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

The chart illustrates March 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, March typically has an average temperature of 1°C (34°F), with highs reaching up to 19°C (67°F) and lows dropping to around -25°C (-14°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.

March Precipitation in Merrillan

In Merrillan in March, the precipitation amount is 56 mm (2.2 in) over the course of 8 days.

March Precipitation Trends in Merrillan

The chart displays monthly precipitation patterns in Merrillan, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In Merrillan, March typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec33525695130135112136971195350
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Merrillan

In Merrillan in March, humidity is 86%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making outdoor adventures brisk and invigorating but challenging for travel.

March Average Humidity in Merrillan

This chart illustrates the average monthly humidity levels in Merrillan, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in Merrillan is approximately 86%, 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 March generated using information from the Copernicus Climate Change Service.

March UV Index in Merrillan

In Merrillan in March, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Merrillan.

Maximum UV Index Levels in Merrillan for March

The chart shows the monthly maximum UV Index (UVI) for Merrillan in March, 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 March, the maximum UV index in Merrillan typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24588101097532
Data source: Merrillan March 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 March 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 March’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 March’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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