August Weather in Grand Coulee

Last updated: March 2, 2024

The weather in Grand Coulee, United States, during August is characterized by an average temperature of 23°C (74°F). Highs can soar to 37°C (99°F), while lows may dip to 10°C (51°F). Typically, the humidity level in Grand Coulee throughout August hovers around 62%.

10°C (51°F)

Minimum temperature

23°C (74°F)

Average temperature

37°C (99°F)

Maximum temperature

62%

Humidity

Precipitation and Sunshine hours

In August, Grand Coulee averages 8 mm (0.3 inches) of rainfall, typically over the course of 2 rainy days. The month enjoys an average of 14 hours 11 minutes of daylight, with the sun shining for approximately 11 hours 42 minutes each day. Additionally, there is a 63% probability of sunny days during this period.

8 mm (0.3 inches)

Precipitation

2 rainy days

Rainy days

11 hours 42 minutes

Sunshine hours

63%

Chance of sun

UV Index

In August, the UV Index in Grand Coulee reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 15 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 2 3 5 7 8 8 8 6 5 3 2 1
Exposure Low Moderate High VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 25 min 30 min 45 min

Compare Grand Coulee's Climate with Cities Worldwide