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May Weather in Merrillan, United States

Last updated: June 24, 2025

In May, the average temperature in Merrillan, United States hovers around 15°C (58°F). Expect a range of -1°C (31°F) to 35°C (94°F), making it essential to prepare for various weather conditions. Precipitation is significant, with around 130 mm (5.1 in) spread across 13 days, and humidity levels averaging a comfortable 79%. Whether you're exploring or simply enjoying the scenery, be ready for an engaging month in Merrillan!

May Temperature in Merrillan

In May in Merrillan, the average temperature is 15°C (58°F). Maximums can reach 35°C (94°F), while minimums can drop as low as -1°C (31°F). This diverse temperature range makes it essential for travelers to pack both warm and light clothing for their adventures.

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

The chart illustrates May 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, May typically has an average temperature of 15°C (58°F), with highs reaching up to 35°C (94°F) and lows dropping to around -1°C (31°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.

May Precipitation in Merrillan

In Merrillan in May, the precipitation amount is 130 mm (5.1 in) spread over 13 days.

May Precipitation Trends in Merrillan

The chart displays monthly precipitation patterns in Merrillan, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Merrillan, May typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec33525695130135112136971195350
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Merrillan

In Merrillan in May, humidity is 79%. With an average temperature of 15°C (58°F), this humidity feels like a thick blanket, making traveling a bit uncomfortable due to the stickiness, but still bearable for those who enjoy mild weather.

May Average Humidity in Merrillan

This chart illustrates the average monthly humidity levels in Merrillan, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Merrillan is approximately 79%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Merrillan

In Merrillan in May, 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 May

The chart shows the monthly maximum UV Index (UVI) for Merrillan in May, 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 May, the maximum UV index in Merrillan typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24588101097532
Data source: Merrillan May 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 May 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 May’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 May’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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