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August Weather in Sumner, United States

Last updated: June 24, 2025

In August, the average temperature in Sumner, United States hovers around 19°C (67°F), with a range that can dip to a chilly 6°C (43°F) and soar to a warm 32°C (90°F). Expect about 90 mm (3.5 in) of precipitation over 11 days, contributing to an average humidity of 74%. Plan accordingly for a blend of warmth and occasional showers!

August Temperature in Sumner

In August in Sumner, the average temperature is 19°C (67°F). Maximums can reach 32°C (90°F), while minimums can drop as low as 6°C (43°F). This makes Sumner a great destination for travelers seeking a pleasant climate with diverse experiences.

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

The chart illustrates August temperature patterns in Sumner, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumner, August typically has an average temperature of 19°C (67°F), with highs reaching up to 32°C (90°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec182128415363686760483423
Data source: Temperature data for Sumner 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 Sumner

In Sumner in August, the total precipitation amounts to 90 mm (3.5 in) over the course of 11 days.

August Precipitation Trends in Sumner

The chart displays monthly precipitation patterns in Sumner, 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 Sumner, August typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec83867212887841339064128107120
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Sumner

In Sumner in August, humidity is 74%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel stifling, often leading travelers to seek shade and hydrate frequently.

August Average Humidity in Sumner

This chart illustrates the average monthly humidity levels in Sumner, 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 Sumner is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Sumner

In Sumner in August, 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 Sumner.

Maximum UV Index Levels in Sumner for August

The chart shows the monthly maximum UV Index (UVI) for Sumner 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 Sumner typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910987532
Data source: Sumner 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 Sumner Compares to Other Months

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

This table compares monthly weather conditions in Sumner, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)83 mm (3.3 inches)91%low
February Weather-6°C (21°F)86 mm (3.4 inches)89%moderate
March Weather-2°C (29°F)72 mm (2.8 inches)85%moderate
April Weather5°C (41°F)128 mm (5.0 inches)84%very high
May Weather12°C (54°F)87 mm (3.4 inches)78%very high
June Weather17°C (64°F)84 mm (3.3 inches)72%very high
July Weather20°C (69°F)133 mm (5.2 inches)75%very high
August Weather19°C (67°F)90 mm (3.5 inches)74%very high
September Weather15°C (60°F)64 mm (2.5 inches)77%high
October Weather9°C (48°F)128 mm (5.0 inches)85%moderate
November Weather1°C (34°F)107 mm (4.2 inches)86%moderate
December Weather-5°C (23°F)120 mm (4.7 inches)85%low

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