Grand Junction, CO weather and climate in 2025
Day
28 °C
Night
10 °C
Sea
0 °C
Precipitation
29 mm
in month
Rainy days
7 days
in month
Daylight
12 hours
average
Sunshine
10 hours
average
Humidity
40 %
Day
28 °C
Night
10 °C
Sea
0 °C
Precipitation
29 mm
in month
Rainy days
7 days
in month
Daylight
12 hours
average
Sunshine
10 hours
average
Humidity
40 %
Overview: Grand Junction, CO
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Weather overview for Grand Junction, CO
Weather overview
In the city of Grand Junction, CO, the climate showcases the full spectacle of all four seasons. Winter months bring chilly nights that often see temperatures dipping below freezing while days are relatively milder. As the calendar turns, spring ushers in blooming flowers with a beautiful increase in day temperatures, though some nights remain brisk. Summer scorches with daytime highs that can soar into the 30s (deg), and it's also the time when you're most grateful for the dry climate that makes the heat more bearable. Autumn displays a picturesque transition with warm days and crisp nights, as the tree leaves turn gold. Throughout the year, precipitation is modest, accumulating more significantly during late summer, while wind speeds vary but often bring a refreshing breeze to the afternoon heat.
January weather
January's chill is apparent with night temperatures averaging -8 °C (17 °F), yet daytime offers some solace with highs around 4 °C (40 °F). A modest amount of precipitation falls this month with 16 mm (0.64 in), mixing snow and rain, and the wind gently brushes at 2 m/s.
February weather
As February arrives, night temperatures start to creep up, averaging -5 °C (23 °F). Daytime highs also increase slightly to 9 °C (47 °F), and with precipitation almost similar to January at 15 mm (0.58 in), the landscape slowly shakes off the winter cloak.
March weather
Welcome to the spring awakening in March, as daytime temperatures see a significant rise to 15 °C (58 °F), perfect for outdoor activities. Night temperatures are still chilly at an average of 0 °C (31 °F), and an increase in precipitation to 23 mm (0.91 in) hints at the upcoming change in seasons.
April weather
Grand Junction enjoys a further temperature rise in April, with the daytime highs comfortably sitting at 20 °C (67 °F). Nights are less biting with an average temperature of 3 °C (38 °F). Gentle winds averaging 3 m/s accompany a slight reduction in precipitation at 22 mm (0.85 in).
May weather
Spring blooms in full vigor in May, with the highest average daytime temperatures of 25 °C (78 °F) thus far. Night temperatures also become more pleasant at 8 °C (47 °F). Precipitation sees a slight uptick to 23 mm (0.92 in), and sun hours stretch longer, filling the days with a warm glow.
June weather
As summer sets in, June boasts the highest average daytime temperature of the year at a scorching 31 °C (89 °F). Nights remain comfortably warm at 13 °C (55 °F). With the lowest precipitation of the year at 13 mm (0.53 in) and decline in humidity down to 30 %, it's a dry and sizzling start to summer.
July weather
July is characterized by blistering daytime temperatures averaging 35 °C (94 °F), marking the peak of summer's warmth. Night temperatures also hit their highest at 17 °C (62 °F). Relative humidity remains low at 34 %, making the excessive heat more bearable, especially with some wind relief.
August weather
August maintains the summer heat with daytime highs averaging 33 °C (91 °F), marginally cooling from July. Nighttime temperatures are warm and comfortable at 16 °C (60 °F). The month also sees the most precipitation of the year with 26 mm (1.02 in) and an average wind speed of 2 m/s.
September weather
The arrival of September signals a gentle retreat from the summer heat, with daytime temperatures dropping to a more moderate 28 °C (82 °F). Nights start to cool down, hinting at fall, with an average low of 10 °C (51 °F). A high number of sun hours at 78 hours inspires outdoor activities in the comfortably warm weather.
October weather
October welcomes the crisp, full spirit of autumn with an average daytime temperature of 20 °C (69 °F), perfect for cozy sweaters and enjoying the fall foliage. The night temperature continues its downward trend to 4 °C (39 °F). Precipitation starts to collect more, reaching an average of 30 mm (1.16 in), while wind speeds drop slightly.
November weather
November brings a definitive chill to the air, with an average daytime high of 12 °C (53 °F), indicating the approach of winter. Night temperatures take a plunge to an average of -2 °C (28 °F), making it the time for warm layers and hot drinks. Precipitation falls to 20 mm (0.80 in), and winds slow down to an average of 2 m/s.
December weather
December arrives with the onset of winter's cold embrace, as average daytime temperatures fall back to 5 °C (41 °F). Night temperatures can be bitterly cold, averaging -7 °C (19 °F). With precipitation similar to that in November, at 16 mm (0.64 in), it's a month of preparing for holiday festivities in a winter atmosphere.
FAQs
How cold does it get at night in Grand Junction during January?
In January, Grand Junction experiences cold nights with an average low of -8 °C (17 °F). It's wise to bundle up after sunset to keep cozy.
Can I expect warmer days in Grand Junction in February compared to January?
Yes, you can expect slightly warmer days in February with daytime highs averaging 9 °C (47 °F), indicating the approach of spring.
Is March considerably warmer during the day in Grand Junction, CO?
Indeed, March sees a considerable warming during the day with average temperatures reaching 15 °C (58 °F), making it a pleasant month for spending time outdoors.
Does April offer comfortable temperatures for daytime outings in Grand Junction?
April offers comfortable and inviting temperatures for daytime activities with highs around 20 °C (67 °F), encouraging everyone to enjoy the budding beauty of spring.
Is May considered warm in Grand Junction?
May is indeed warm in Grand Junction with lush daytime highs reaching an average of 25 °C (78 °F). It's a month that truly feels like spring turning into summer.
How hot does it get during the day in Grand Junction in June?
June days can get quite hot in Grand Junction, with the temperature soaring to an average high of 31 °C (89 °F). It's a perfect time for those who love the heat of summer!
What are typical daytime and night temperatures in Grand Junction during July?
Typical daytime temperatures in July are sweltering, averaging 35 °C (94 °F), while nights are significantly warmer than earlier months, averaging 17 °C (62 °F).
Does August in Grand Junction have cooler temperatures compared to July?
August in Grand Junction does experience a slight decrease in temperatures compared to July, with daytime highs averaging 33 °C (91 °F), offering a bit of a respite from the peak summer heat.
How significant is the temperature change from August to September in Grand Junction?
The change from August to September in Grand Junction is quite noticeable as daytime highs average a mellower 28 °C (82 °F), depicting the onset of autumn.
Is October a good month for witnessing fall colors in Grand Junction?
October in Grand Junction is indeed the perfect month for witnessing the vibrant fall colors as the trees put on a magnificent display accompanied by mild daytime temperatures.
How much does the temperature drop in Grand Junction during November?
The temperature drop in Grand Junction during November is significant with daytime highs dipping to 12 °C (53 °F). The cold is setting in, prompting locals and visitors to dress warmly.
Does December in Grand Junction feel like a winter month?
December in Grand Junction certainly has a winter feel, with cooler daytime temperatures and potential snowfall setting a festive mood for the holidays.
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