Grand Junction (CO) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Grand Junction.
Climate overview of Grand Junction
Grand Junction, Colorado, United States of America, sees big temperature differences between seasons, with July peaking at 34°C (93°F) and January dropping to 2°C (36°F).
Rain/snowfall is modest, totalling around 255 mm (10 in) annually. The city experiences a distinct dry season from January to December. September tends to be the wettest month. The most sunshine falls in June, with an average of 11.9 hours of daily sunshine.
Grand Junction Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grand Junction — and find the best time to visit.
Monthly Temperature in Grand Junction
Visitors to Grand Junction can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a very warm 34°C (93°F) in July, the warmest time of the year, to a chilly 2°C (36°F) during cooler months like January.
At night, you can expect temperatures ranging from 18°C (64°F) in July to around -9°C (16°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Grand Junction
Grand Junction's climate is marked by below-average rain/snowfall, accumulating 255 mm (10 in) of precipitation yearly. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, September it receives moderate rainfall, averaging 32 mm (1.3 in) of precipitation, recorded across 7 rainy days. In contrast, the driest month June brings less rainfall, with 12 mm (0.5 in) over 3 rainy days. For more details, please visit our Grand Junction Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Grand Junction
Seasonal changes in sunshine hours are quite dramatic in Grand Junction. While June receives considerable daily sunshine with up to 11.9 hours, December marks the darkest time of the year, where sunshine is scarce with only 6.0 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Grand Junction by Month
The relative humidity is moderate throughout the year in Grand Junction.
The city experiences its highest humidity in January, reaching 68%. In June, the humidity drops to its lowest level at 28%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Grand Junction
The mean wind speed varies between 2 m/s (4 knots) and 5 m/s (10 knots) throughout the year. It is lowest in January and highest during June. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Grand Junction
The weather does bring rainfall during this period, between 26 mm (1 in) and 32 mm (1.3 in). Need help choosing your next travel destination? We offer a specialized tool that matches you with locations based on your weather preferences. Explore destinations that suit your climate preferences.
Frequently asked questions about the climate in Grand Junction
What is the best time to visit Grand Junction?
April, May and September typically offer the most optimal weather in Grand Junction. In contrast, January, July and December tend to have less optimal conditions. Grand Junction has a distinct dry season from January to December.
What temperatures can I expect in Grand Junction?
Daytime highs range from 2°C (36°F) in January to 34°C (93°F) in July. Nighttime lows range from -9°C (16°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Grand Junction get?
Annual rainfall is around 255 mm (10 in). September is the wettest month with 32 mm (1.3 in), while June is the driest with 12 mm (0.5 in).
How sunny is Grand Junction?
Grand Junction receives around 3,204 hours of sunshine per year. June is the sunniest month with 357 hours, while December is the cloudiest with just 181 hours. Overall, Grand Junction enjoys abundant sunshine.
Grand Junction 3-Day Forecast
Grand Junction (CO) 3-Day Forecast
Grand Junction on the map
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