The temperatures in Monticello in September are comfortable with low of 11°C and and high up to 22°C.
You can expect about 3 to 8 days of rain in Monticello 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 Monticello in September 2025.
If you’re planning to visit Monticello in the near future, we highly recommend that you review the 14 day weather forecast for Monticello before you arrive.
Temperatures
22° / 11°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
84
mm
Sun Hours
10.3
Hrs
