Mesa County (Grand Junction)
September
Weather in Mesa County, Colorado for September 2026
Your guide to Mesa County weather in September - trends and predictions
In general, the average temperature in Mesa County 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.
With an average of 5 rainy days, Mesa County experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
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25
Dry days
5
Rainy days
0
Snow days
27°/9°
Temperatures
19 km/h
Avg max wind
45 %
Avg humidity
Mesa County Weather September
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Temperatures trend during September in Mesa County
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September weather in Mesa County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 32° /10° | 0 mm | 8 | |
| Sept. 2 | Sunny | 33° /10° | 0 mm | 8 | |
| Sept. 3 |  Partly cloudy | 33° /11° | 0 mm | 8 | |
| Sept. 4 | Sunny | 33° /11° | 0 mm | 8 | |
| Sept. 5 | Sunny | 30° /14° | 0 mm | 8 | |
| Sept. 6 | Partly cloudy | 28° /11° | 0 mm | 7 | |
| Sept. 7 | Sunny | 28° /10° | 0 mm | 7 | |
| Sept. 8 | Sunny | 29° /10° | 0 mm | 7 | |
| Sept. 9 |  Cloudy | 28° /10° | 0 mm | 6 | |
| Sept. 10 | Sunny | 31° /10° | 0 mm | 8 | |
| Sept. 11 |  Thundery outbreaks possible | 28° /12° | 6 mm | 6 | |
| Sept. 12 |  Moderate or heavy rain shower | 23° /10° | 31.7 mm | 5 | |
| Sept. 13 |  Torrential rain shower | 20° /7° | 52.3 mm | 5 | |
| Sept. 14 | Sunny | 23° /6° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 28° /6° | 0 mm | 7 | |
| Sept. 16 | Sunny | 29° /7° | 0 mm | 7 | |
| Sept. 17 | Sunny | 24° /11° | 0 mm | 6 | |
| Sept. 18 | Sunny | 25° /7° | 0 mm | 7 | |
| Sept. 19 |  Overcast | 25° /7° | 0 mm | 6 | |
| Sept. 20 | Partly cloudy | 27° /9° | 0 mm | 7 | |
| Sept. 21 | Partly cloudy | 25° /7° | 0 mm | 7 | |
| Sept. 22 |  Patchy rain possible | 26° /9° | 0.3 mm | 6 | |
| Sept. 23 | Sunny | 22° /7° | 0 mm | 6 | |
| Sept. 24 | Sunny | 23° /3° | 0 mm | 6 | |
| Sept. 25 | Sunny | 27° /5° | 0 mm | 7 | |
| Sept. 26 | Overcast | 22° /7° | 0 mm | 5 | |
| Sept. 27 | Partly cloudy | 25° /7° | 0 mm | 7 | |
| Sept. 28 | Partly cloudy | 23° /7° | 4.6 mm | 6 | |
| Sept. 29 | Sunny | 24° /7° | 0 mm | 6 | |
| Sept. 30 | Overcast | 22° /7° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Mesa County 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 Mesa County forecast closer to your planned date for the most up-to-date weather information.
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Mesa County in September - FAQ
What are the expected maximum and minimum temperatures in Mesa County 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 Mesa County during September?
Moderate rainfall is anticipated in Mesa County 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 Mesa County during September?
The average wind speed in Mesa County during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Mesa County
Explore the daily rainfall trends and prepare for Mesa Countys September weather 💧
UV exposure in Mesa County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Mesa County?Get accurate weather forecasts for Mesa County, located at latitude 39.064 and longitude -108.551. Stay updated with localized weather information tailored for Mesa County.
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