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%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
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.
Precipitation
Rainy days
Sunshine hours
Chance of sun
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.
| 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 | ||||||