Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September in Monticello sees a slight reduction in average high-temperature, with a shift from 81.5°F (27.5°C) in August to a still moderately hot 74.5°F (23.6°C). In September, the temperature in Monticello drops to an average of 55°F (12.8°C) at night.Humidity
In Monticello, the average relative humidity in September is 39%.Rainfall
In September, the rain falls for 10.9 days. Throughout September, 1.1" (28mm) of precipitation is accumulated. Throughout the year, there are 94.8 rainfall days, and 12.72" (323mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 44.3 snowfall days, and 31.34" (796mm) of snow is accumulated.Daylight
In Monticello, the average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:48 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:01 pm MDT.
Sunshine
The average sunshine in September is 10.8h.UV index
In Monticello, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How much does it rain in September?
When does it start to snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Monticello have in September?
What is the UV index reading in September?
Average temperature in September
Monticello, UT
- Average high temperature in September: 74.5°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).
Average pressure in September
Monticello, UT
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Monticello, UT
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is January (5.8mph).
Average humidity in September
Monticello, UT
- Average humidity in September: 39%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is June (25%).
Average rainfall in September
Monticello, UT
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is July (1.89").
The driest month (with the least rainfall) is June (0.59").
Average rainfall days in September
Monticello, UT
- Average rainfall days in September: 10.9 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is November (2.9 days).
Average snowfall in September
Monticello, UT
- Average snowfall in September: 0.04"
The month with the highest snowfall is December (8.62").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Monticello, UT
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (10.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Monticello, UT
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 24min).
Average sunshine days in September
Monticello, UT
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is November (22.9 days).
The month with the least sunshine days is July (9.6 days).
Average UV index in September
Monticello, UT
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Monticello, UT
- Average cloud cover in September: 12
The month with the most cloud cover is December (Cloud cover 29).
The month with the least cloud cover is June (Cloud cover 11).
Average visibility in September
Monticello, UT
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Monticello, Utah, USA
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