Monticello Weather in September

What's the weather like in Monticello (Utah) in September 2025?

The climate in Monticello during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Monticello and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 6°C (43°F) is normal.

Monticello weather averages (imperial / metric)
Daytime temperature 22.6°C 72.6°F
Nightly temperature 6.1°C 42.9°F
Average temperature 14.3°C 57.7°F
Daily sunshine 10.4 hrs
Avg rainfall 39 mm 1.5 ins
Rainy days 7 days
Sea temperature 18.4°C 65.2°F
Humidity 44%
Windspeed 15.1kph 9 mph

On average September is the 5th wettest month of the year in Monticello with around 39mm 1.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 10.4 hours of sunshine per day.

September temperatures in Monticello

Monticello average temperature in September

September rainfall

Monticello average rain in September

September hourly sunshine

Monticello average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Monticello in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Monticello weather stats

Monticello weather statistics
Hottest month: July 28.5°C 83.3°F
Driest month: June 19mm 0.7ins
Sunniest month: June 12.7hrs
Coldest month: January 1.6°C 34.9°F
Wettest month: August 50mm 2ins
Map showing location of Monticello (37.87138, -109.34289) Monticello map pin © Google

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