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July Weather in Grand Coulee, United States

Last updated: June 24, 2025

In July, the average temperature in Grand Coulee, United States hovers around 24°C (75°F), making it a pleasantly warm time to visit. However, be prepared for a temperature range that can dip to a minimum of 11°C (51°F) and soar up to a maximum of 41°C (107°F). Rain showers may make an appearance, with an average precipitation of 4 mm (0.1 in) over just 1 day. The air tends to be quite humid, with an average humidity of 77%, adding to the tropical charm.

July Temperature in Grand Coulee

In July in Grand Coulee, the average temperature is 24°C (75°F), with maximums reaching 41°C (107°F) and minimums dropping as low as 11°C (51°F). This diverse temperature range makes it a great time for travelers to experience both warm days and cooler evenings.

July Weather in Grand Coulee: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Grand Coulee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand Coulee, July typically has an average temperature of 24°C (75°F), with highs reaching up to 41°C (107°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec282839485967757362473729
Data source: Temperature data for Grand Coulee 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.

July Precipitation in Grand Coulee

In Grand Coulee in July, the precipitation amount is 4 mm (0.1 in) over the course of 1 day.

July Precipitation Trends in Grand Coulee

The chart displays monthly precipitation patterns in Grand Coulee, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Grand Coulee, July typically receives around 4 mm (0.1 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec6747464037134824425157
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in Grand Coulee

In Grand Coulee in July humidity is 77%. With an average temperature of 24°C (75°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel stifling and may require frequent breaks to stay hydrated while exploring.

July Average Humidity in Grand Coulee

This chart illustrates the average monthly humidity levels in Grand Coulee, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Grand Coulee is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Grand Coulee

In Grand Coulee in July, 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 Grand Coulee.

Maximum UV Index Levels in Grand Coulee for July

The chart shows the monthly maximum UV Index (UVI) for Grand Coulee in July, 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 July, the maximum UV index in Grand Coulee typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245689997532
Data source: Grand Coulee July 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 July Weather in Grand Coulee Compares to Other Months

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

This table compares monthly weather conditions in Grand Coulee, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)67 mm (2.6 inches)85%low
February Weather-2°C (28°F)47 mm (1.9 inches)86%moderate
March Weather4°C (39°F)46 mm (1.8 inches)86%moderate
April Weather9°C (48°F)39 mm (1.6 inches)82%high
May Weather15°C (59°F)37 mm (1.4 inches)77%very high
June Weather20°C (68°F)13 mm (0.5 inches)79%very high
July Weather24°C (75°F)4 mm (0.1 inches)77%very high
August Weather23°C (74°F)8 mm (0.3 inches)62%very high
September Weather17°C (62°F)24 mm (1.0 inches)60%high
October Weather8°C (48°F)42 mm (1.7 inches)80%moderate
November Weather3°C (37°F)51 mm (2.0 inches)87%moderate
December Weather-2°C (29°F)57 mm (2.2 inches)86%low

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