September weather forecast and climate
Mill Spring, MO

The first month of the autumn, September, is also a moderately hot month in Mill Spring, Missouri, with temperature in the range of an average high of 81.3°F (27.4°C) and an average low of 60.1°F (15.6°C).

Temperature

In Mill Spring, Missouri, the average high-temperature slightly decreases, from a tropical 87.8°F (31°C) in August, to a moderately hot 81.3°F (27.4°C). In September, in Mill Spring, Missouri, the average low-temperature is 60.1°F (15.6°C).

Heat index

The average heat index is estimated at 86°F (30°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like activity, pregnancy, wind, and metabolic differences affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Mill Spring, the average relative humidity is 74%.

Rainfall

Months with the least rainfall in Mill Spring are September and December Rain falls for 10.2 days and accumulates 1.26" (32mm) of rain.

Snowfall

April through October are months without snowfall.

Daylight

In Mill Spring, the average length of the day is 12.4h.

Sunshine

The average sunshine in September is 9.6h.

UV index

The average daily maximum UV index in Mill Spring, Missouri, is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Mill Spring?

The average high-temperature, in September, in Mill Spring, is 81.3°F (27.4°C), while the average low-temperature is 60.1°F (15.6°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines both air temperature and relative humidity, in September is calculated to 86°F (30°C).

What is the average humidity in September in Mill Spring?

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

How many days does it rain in September in Mill Spring?

In September, in Mill Spring, Missouri, the rain falls for 10.2 days. Throughout September, 1.26" (32mm) of precipitation is accumulated.

What is the driest month in Mill Spring?

September and December are months with the least rain when the rain falls for 10.2 days and typically aggregates up to 1.26" (32mm) of rain.

When it does not snow in Mill Spring?

April through October are months without snowfall in Mill Spring.

How many hours of daylight does Mill Spring have in September?

The average length of the day in September in Mill Spring is 12.4h.

How many hours of sunshine does Mill Spring have in September?

In September, the average sunshine is 9.6h.

What is the UV index intensity in September in Mill Spring?

In Mill Spring, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Mill Spring, MO
  • Average high temperature in September: 81.3°F

The warmest month (with the highest average high temperature) is July (89.4°F).
The month with the lowest average high temperature is January (41.5°F).

  • Average low temperature in September: 60.1°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).

Average pressure in September - Mill Spring, MO
  • Average pressure in September: 30.02"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.93").

Average wind speed in September - Mill Spring, MO
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in September - Mill Spring, MO
  • Average humidity in September: 74%

The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (72%).

Average rainfall in September - Mill Spring, MO
  • Average rainfall in September: 1.26"

The wettest month (with the highest rainfall) is April (3.03").
The driest months (with the least rainfall) are September and December (1.26").

Average rainfall days in September - Mill Spring, MO
  • Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is July (15.7 days).
Months with the least rainy days are January and December (8.1 days).

Average snowfall in September - Mill Spring, MO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.65").
Months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September - Mill Spring, MO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3.8 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 9.6h

The month with the most sunshine is June (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.9h).

Average sunshine days in September - Mill Spring, MO
  • Average sunshine days in September: 17.6 days

The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is July (12 days).

Average UV index in September - Mill Spring, MO
  • Average UV index in September: 5

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

Average cloud cover in September - Mill Spring, MO
  • Average cloud cover in September: 30

The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 28).

Average visibility in September - Mill Spring, MO
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, June, September, October, November and December (6mi).
Months with the lowest visibility are May, July and August (5mi).