Yosemite National Park is definitely worth a visit
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Grand Junction (CO) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Grand Junction.
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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 very little rainfall year-round, with very warm summers and cold winters. 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
Conditions in Grand Junction are generally most comfortable in April, May and September. They are typically least comfortable in January, July and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
mixed
Mar
very good
Apr
excellent
May
excellent
Jun
very good
Jul
very hot
Aug
very good
Sep
excellent
Oct
very good
Nov
good
Dec
cold
- Best overall: April, May and September
- Warmest weather: July
- Most sunshine: June and July
- Fewest rainy days: February, June and November
- Seasonal pattern: Very little rainfall year-round, with very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -9°C (16°F).
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 very little rainfall year-round, with very warm summers and cold winters.
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 on the map
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