The highest day temperature in August 2025 was 104°F. The lowest night temperature was 52°F. The average values for day and night temperatures during August were 93.6°F и 58.4°F respectivly.

Most of the days in August are sunny but you can also expect cloudy and gloomy days.

Precipitation total in August for Grand Junction is 0.3 in. This value is relatively stable throughout the year.

The average wind speed in August is 6.2 mph.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Grand Junction in August is 10.7 hours.