The temperatures in Greeley in September are comfortable with low of 12°C and and high up to 28°C.
You can expect about 3 to 8 days of rain in Greeley during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Greeley in September 2025.
If you’re planning to visit Greeley in the near future, we highly recommend that you review the 14 day weather forecast for Greeley before you arrive.
Temperatures
28° / 12°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
29
mm
Sun Hours
10.0
Hrs
