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August Weather in Merrillan, United States

Last updated: June 24, 2025

In August, the average temperature in Merrillan, United States hovers around 20°C (69°F), offering a pleasant climate for outdoor activities. Expect a minimum of 9°C (48°F) and a maximum of 33°C (91°F), giving you a taste of both cool and warm days. With an average precipitation of 136 mm (5.4 in) spread over 12 days, you might want to pack an umbrella. The humidity sits at a comfortable 78%, making it a great time to explore the vibrant surroundings!

August Temperature in Merrillan

In August in Merrillan, the average temperature is 20°C (69°F). Maximum temperatures can reach 33°C (91°F), while the minimum can drop as low as 9°C (48°F). This varied climate makes Merrillan a great destination for travelers looking to enjoy mild days and cool evenings.

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

The chart illustrates August 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, August typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (91°F) and lows dropping to around 9°C (48°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.

August Precipitation in Merrillan

In Merrillan in August, the total precipitation amount reaches 136 mm (5.4 in) over the course of 12 days.

August Precipitation Trends in Merrillan

The chart displays monthly precipitation patterns in Merrillan, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Merrillan, August typically receives around 136 mm (5.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec33525695130135112136971195350
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Merrillan

In Merrillan in August, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

August Average Humidity in Merrillan

This chart illustrates the average monthly humidity levels in Merrillan, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Merrillan is approximately 78%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Merrillan

In Merrillan in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Merrillan.

Maximum UV Index Levels in Merrillan for August

The chart shows the monthly maximum UV Index (UVI) for Merrillan in August, 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 August, the maximum UV index in Merrillan typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24588101097532
Data source: Merrillan August 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 August 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 August’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 August’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

Compare Merrillan's Climate with Cities Worldwide