September weather forecast and climate
Monticello, MO

September, the first month of the autumn, in Monticello, is also a moderately hot month, with average temperature ranging between max 77.9°F (25.5°C) and min 58.1°F (14.5°C).

Temperature

In Monticello, the average high-temperature in September marginally drops, from 83.7°F (28.7°C) in August, to a still moderately hot 77.9°F (25.5°C). In September, in Monticello, Missouri, the average low-temperature is 58.1°F (14.5°C).

Humidity

The average relative humidity in Monticello is 74%.

Rainfall

In September, in Monticello, the rain falls for 11.2 days. Throughout September, 2.28" (58mm) of precipitation is accumulated. In Monticello, during the entire year, the rain falls for 137.5 days and collects up to 27.68" (703mm) of precipitation.

Snowfall

In Monticello snow does not fall in May through September.

Daylight

In September, the average length of the day is 12.4h.

Sunshine

In Monticello, Missouri, the average sunshine is 9.5h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Monticello?

In Monticello, Missouri, in September, the average high-temperature is 77.9°F (25.5°C), and the average low-temperature is 58.1°F (14.5°C).

What is the average humidity in September in Monticello?

In September, the average relative humidity in Monticello, Missouri, is 74%.

How many days does it rain in September in Monticello?

In September, the rain falls for 11.2 days. Throughout September, 2.28" (58mm) of precipitation is accumulated.

Does it snow in Monticello in September?

In Monticello, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Monticello?

May through September are months without snowfall in Monticello.

What is the average length of the day in September in Monticello?

In Monticello, Missouri, the average length of the day in September is 12.4h.

How many hours of sunshine does Monticello have in September?

In Monticello, Missouri, the average sunshine in September is 9.5h.

How high is the UV index in September in Monticello?

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Monticello, MO
  • Average high temperature in September: 25.5°C

The warmest month (with the highest average high temperature) is July (29.2°C).
The month with the lowest average high temperature is January (0.3°C).

  • Average low temperature in September: 14.5°C

The month with the highest average low temperature is July (19.2°C).
The coldest month (with the lowest average low temperature) is January (-6.6°C).

Average pressure in September - Monticello, MO
  • Average pressure in September: 1016.6mbar

The month with the highest atmospheric pressure is January (1021.1mbar).
The month with the lowest atmospheric pressure is June (1012.6mbar).

Average wind speed in September - Monticello, MO
  • Average wind speed in September: 11.8km/h

The windiest months (with the highest average wind speed) are January and February (16.4km/h).
The calmest month (with the lowest average wind speed) is July (10.5km/h).

Average humidity in September - Monticello, MO
  • Average humidity in September: 74%

Months with the highest relative humidity are May, June and July (80%).
The month with the lowest relative humidity is October (70%).

Average rainfall in September - Monticello, MO
  • Average rainfall in September: 58mm

The wettest month (with the highest rainfall) is May (99mm).
The driest month (with the least rainfall) is January (32mm).

Average rainfall days in September - Monticello, MO
  • Average rainfall days in September: 11.2 days

Months with the highest number of rainy days are May and June (17.3 days).
The month with the least rainy days is January (5.3 days).

Average snowfall in September - Monticello, MO
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (107mm).
Months with the least snowfall are May, June, July, August and September (0mm).

Average snowfall days in September - Monticello, MO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.3 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Monticello, MO
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 9.5h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 4.4h).

Average sunshine days in September - Monticello, MO
  • Average sunshine days in September: 17 days

The month with the most sunshine days is December (19.5 days).
The month with the least sunshine days is June (10.1 days).

Average UV index in September - Monticello, MO
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September - Monticello, MO
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September - Monticello, MO
  • Average visibility in September: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).