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Grand Junction (CO)
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United States weather

Weather in Grand Junction, Colorado for September 2026

Your guide to Grand Junction weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Grand Junction at the beginning of September is 31 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.7 °F by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Grand Junction experiences minimal rainfall in September.

    • More

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Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/9°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
45 %
Avg humidity

Grand Junction Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
32°
2
Sunny
33°
3
Partly cloudy
33°
4
Sunny
33°
5
Sunny
30°
6
Partly cloudy
28°
7
Sunny
28°
8
Sunny
29°
9
Cloudy
28°
10
Sunny
31°
11
Thundery outbreaks possible
28°
12
Moderate or heavy rain shower
23°
13
Torrential rain shower
20°
14
Sunny
23°
15
Partly cloudy
28°
16
Sunny
29°
17
Sunny
24°
18
Sunny
25°
19
Overcast
25°
20
Partly cloudy
27°
21
Partly cloudy
25°
22
Patchy rain possible
26°
23
Sunny
22°
24
Sunny
23°
25
Sunny
27°
26
Overcast
22°
27
Partly cloudy
25°
28
Partly cloudy
23°
29
Sunny
24°
30
Overcast
22°

Temperatures trend during September in Grand Junction

See the weather trend as well as the moving average line

September weather in Grand Junction day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 32° /10° 0 mm 8
Sept. 2 Sunny
Sunny
 33° /10° 0 mm 8
Sept. 3 Partly cloudy
Partly cloudy
 33° /11° 0 mm 8
Sept. 4 Sunny
Sunny
 33° /11° 0 mm 8
Sept. 5 Sunny
Sunny
 30° /14° 0 mm 8
Sept. 6 Partly cloudy
Partly cloudy
 28° /11° 0 mm 7
Sept. 7 Sunny
Sunny
 28° /10° 0 mm 7
Sept. 8 Sunny
Sunny
 29° /10° 0 mm 7
Sept. 9 Cloudy
Cloudy
 28° /10° 0 mm 6
Sept. 10 Sunny
Sunny
 31° /10° 0 mm 8
Sept. 11 Thundery outbreaks possible
Thundery outbreaks possible
 28° /12° 6 mm 6
Sept. 12 Moderate or heavy rain shower
Moderate or heavy rain shower
 23° /10° 31.7 mm 5
Sept. 13 Torrential rain shower
Torrential rain shower
 20° /7° 52.3 mm 5
Sept. 14 Sunny
Sunny
 23° /6° 0 mm 6
Sept. 15 Partly cloudy
Partly cloudy
 28° /6° 0 mm 7
Sept. 16 Sunny
Sunny
 29° /7° 0 mm 7
Sept. 17 Sunny
Sunny
 24° /11° 0 mm 6
Sept. 18 Sunny
Sunny
 25° /7° 0 mm 7
Sept. 19 Overcast
Overcast
 25° /7° 0 mm 6
Sept. 20 Partly cloudy
Partly cloudy
 27° /9° 0 mm 7
Sept. 21 Partly cloudy
Partly cloudy
 25° /7° 0 mm 7
Sept. 22 Patchy rain possible
Patchy rain possible
 26° /9° 0.3 mm 6
Sept. 23 Sunny
Sunny
 22° /7° 0 mm 6
Sept. 24 Sunny
Sunny
 23° /3° 0 mm 6
Sept. 25 Sunny
Sunny
 27° /5° 0 mm 7
Sept. 26 Overcast
Overcast
 22° /7° 0 mm 5
Sept. 27 Partly cloudy
Partly cloudy
 25° /7° 0 mm 7
Sept. 28 Partly cloudy
Partly cloudy
 23° /7° 4.6 mm 6
Sept. 29 Sunny
Sunny
 24° /7° 0 mm 6
Sept. 30 Overcast
Overcast
 22° /7° 0 mm 5
Next
Important Notice
Our weather forecast for Grand Junction in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Grand Junction forecast closer to your planned date for the most up-to-date weather information.
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Grand Junction in September - FAQ

What are the expected maximum and minimum temperatures in Grand Junction during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Grand Junction during September?
Moderate rainfall is anticipated in Grand Junction during September, with a total of 94.9 mm spread over approximately 5 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Grand Junction during September?
The average wind speed in Grand Junction during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Grand Junction

Explore the daily rainfall trends and prepare for Grand Junctions September weather 💧

UV exposure in Grand Junction during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Grand Junction?

Get accurate weather forecasts for Grand Junction, located at latitude 39.064 and longitude -108.551. Stay updated with localized weather information tailored for Grand Junction.

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