September weather forecast
Old Monroe, MO

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Weather in September

The first month of the autumn, September, is still a warm month in Old Monroe, Missouri, with an average temperature varying between 79.3°F (26.3°C) and 59.5°F (15.3°C).

Temperature

The advent of September brings a slight shift in average high-temperature, moving from a warm 85.5°F (29.7°C) in August to a still moderately hot 79.3°F (26.3°C). Throughout the month of September, the average temperature dips to a mild 59.5°F (15.3°C) at night.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Old Monroe, in September, during 11.9 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. In Old Monroe, during the entire year, the rain falls for 152.1 days and collects up to 32.01" (813mm) of precipitation.

Snowfall

May through October are months without snowfall in Old Monroe.

Daylight

In Old Monroe, the average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:32 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:46 pm CDT.

Sunshine

In September, the average sunshine in Old Monroe, Missouri, is 9.6h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: A maximum high daily UV index of 5 during September translates into the following directions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Updated: Jun 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature during September is 79.3°F (26.3°C) and the low-temperature is 59.5°F (15.3°C). The average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in August is computed to be 96.8°F (36°C).

What is the average humidity in September?

In September, the average relative humidity is 74%.

How much does it rain in September?

In Old Monroe, in September, during 11.9 rainfall days, 2.13" (54mm) of precipitation is typically accumulated.

When it does not snow?

In Old Monroe, snow does not fall in May through October.

What is the average length of the day in September?

The average day length in September is 12h and 26min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:32 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:46 pm CDT.

How many hours of sunshine does Old Monroe have in September?

The average sunshine duration in September is 9.6h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Old Monroe, MO

Average temperature in September - Old Monroe, MO
  • Average high temperature in September: 79.3°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in September: 59.5°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).

Average pressure in September
Old Monroe, MO

Average pressure in September - Old Monroe, MO
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in September
Old Monroe, MO

Average wind speed in September - Old Monroe, MO
  • Average wind speed in September: 6mph

The windiest months (with the highest average wind speed) are January and February (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in September
Old Monroe, MO

Average humidity in September - Old Monroe, MO
  • Average humidity in September: 74%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (72%).

Average rainfall in September
Old Monroe, MO

Average rainfall in September - Old Monroe, MO
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is April (3.82").
The driest month (with the least rainfall) is February (1.77").

Average rainfall days in September
Old Monroe, MO

Average rainfall days in September - Old Monroe, MO
  • Average rainfall days in September: 11.9 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in September
Old Monroe, MO

Average snowfall in September - Old Monroe, MO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (3.15").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Old Monroe, MO

Average snowfall days in September - Old Monroe, MO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Old Monroe, MO

Average daylight in September / Average sunshine in September - Old Monroe, MO
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 4min

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days in September
Old Monroe, MO

Average sunshine days in September - Old Monroe, MO
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is June (10.9 days).

Average UV index in September
Old Monroe, MO

Average UV index in September - Old Monroe, MO
  • Average UV index in September: 5

The months with the highest UV index are May, 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
Old Monroe, MO

Average cloud cover in September - Old Monroe, MO
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
Old Monroe, MO

Average visibility in September - Old Monroe, MO
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Old Monroe, Missouri, USA

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