Last updated: June 24, 2025
In Grand Coulee, United States, the average temperature in June hovers around 20°C (68°F), making it a pleasant time to visit. However, temperatures can range from a cool 6°C (43°F) to a scorching 43°C (110°F). Expect about 13 mm (0.5 in) of precipitation spread across 4 days, with an average humidity level of 79%, adding a touch of tropical freshness to the air.
In June in Grand Coulee, the average temperature is a comfortable 20°C (68°F). However, temperatures can rise to a scorching 43°C (110°F) during the day, while nighttime lows can drop to a cool 6°C (43°F). Be sure to pack both lightweight clothing for the heat and warmer layers for the chilly evenings to ensure a pleasant travel experience.
In Grand Coulee in June, the precipitation amount is 13 mm (0.5 in) over a span of 4 days.
In Grand Coulee in June humidity is 79%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that clings to the skin, making outdoor activities feel more strenuous and prompting the need for frequent breaks and hydration while traveling.
In Grand Coulee in June, 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.
UV Risk Categories
Weather in Grand Coulee varies notably across the year, with each month offering distinct climate conditions. This page compares June’s weather to other months in Grand Coulee, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| 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 Weather | 4°C (39°F) | 46 mm (1.8 inches) | 86% | moderate |
| April Weather | 9°C (48°F) | 39 mm (1.6 inches) | 82% | high |
| May Weather | 15°C (59°F) | 37 mm (1.4 inches) | 77% | very high |
| June Weather | 20°C (68°F) | 13 mm (0.5 inches) | 79% | very high |
| July Weather | 24°C (75°F) | 4 mm (0.1 inches) | 77% | very high |
| August Weather | 23°C (74°F) | 8 mm (0.3 inches) | 62% | very high |
| September Weather | 17°C (62°F) | 24 mm (1.0 inches) | 60% | high |
| October Weather | 8°C (48°F) | 42 mm (1.7 inches) | 80% | moderate |
| November Weather | 3°C (37°F) | 51 mm (2.0 inches) | 87% | moderate |
| December Weather | -2°C (29°F) | 57 mm (2.2 inches) | 86% | low |