September weather forecast
Melvin, IL

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Melvin, Illinois, with an average temperature varying between 57.4°F (14.1°C) and 75.7°F (24.3°C).

Temperature

The onset of September notes an average high-temperature of a still moderately hot 75.7°F (24.3°C), subtly shifted from August's 79.7°F (26.5°C). Throughout September, Melvin witnesses a nighttime temperature average of 57.4°F (14.1°C).

Humidity

In Melvin, the average relative humidity in September is 77%.

Rainfall

In Melvin, in September, during 10.3 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. In Melvin, during the entire year, the rain falls for 126.2 days and collects up to 14.96" (380mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of the month, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:36 pm CDT.

Sunshine

In September, the average sunshine is 8.7h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

The average high-temperature, in September, in Melvin, is 75.7°F (24.3°C), while the average low-temperature is 57.4°F (14.1°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in July is evaluated at 86°F (30°C).

What is the average humidity in September?

In Melvin, the average relative humidity in September is 77%.

How much does it rain in September?

In Melvin, Illinois, in September, during 10.3 rainfall days, 0.94" (24mm) of precipitation is typically accumulated.

When it does not snow?

In Melvin, snow does not fall in May through September.

Does it snow in September?

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

What is the average length of the day in September?

In September, the average day length is 12h and 27min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:36 pm CDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.7h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents 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
Melvin, IL

Average temperature in September - Melvin, IL
  • Average high temperature in September: 75.7°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in September: 57.4°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).

Average pressure in September
Melvin, IL

Average pressure in September - Melvin, IL
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in September
Melvin, IL

Average wind speed in September - Melvin, IL
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is January (11mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in September
Melvin, IL

Average humidity in September - Melvin, IL
  • Average humidity in September: 77%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Melvin, IL

Average rainfall in September - Melvin, IL
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is May (1.93").
The driest months (with the least rainfall) are February and December (0.75").

Average rainfall days in September
Melvin, IL

Average rainfall days in September - Melvin, IL
  • Average rainfall days in September: 10.3 days

The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is January (4.8 days).

Average snowfall in September
Melvin, IL

Average snowfall in September - Melvin, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.38").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Melvin, IL

Average snowfall days in September - Melvin, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.3 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
Melvin, IL

Average daylight in September / Average sunshine in September - Melvin, IL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in September
Melvin, IL

Average sunshine days in September - Melvin, IL
  • Average sunshine days in September: 17 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (10.3 days).

Average UV index in September
Melvin, IL

Average UV index in September - Melvin, IL
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
Melvin, IL

Average cloud cover in September - Melvin, IL
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 33).

Average visibility in September
Melvin, IL

Average visibility in September - Melvin, IL
  • Average visibility in September: 6mi

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

Melvin, Illinois, USA

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