September weather forecast and climate
Rolla, KS

The first month of the autumn, September, is also a moderately hot month in Rolla, Kansas, with average temperature ranging between max 84.4°F (29.1°C) and min 62.8°F (17.1°C).

Temperature

In September, the average high-temperature marginally drops, from a hot 91.4°F (33°C) in August, to a warm 84.4°F (29.1°C). In Rolla, the average low-temperature is 62.8°F (17.1°C).

Heat index

In September, the average heat index is evaluated at 85.8°F (29.9°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. 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 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, clothing, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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 Rolla, the average relative humidity in September is 51%.

Rainfall

In Rolla, during September, the rain falls for 9.9 days and regularly aggregates up to 1.02" (26mm) of precipitation. Throughout the year, there are 97.1 rainfall days, and 14.25" (362mm) of precipitation is accumulated.

Snowfall

In Rolla snow does not fall in May through September.

Daylight

The average length of the day in Rolla is 12.4h.

Sunshine

In Rolla, the average sunshine is 9.3h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents 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. Light skin individuals may get burned in less than 30 minutes. 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 Rolla?

In Rolla, Kansas, in September, the average high-temperature is 84.4°F (29.1°C), and the average low-temperature is 62.8°F (17.1°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), that combines air temperature and relative humidity, is calculated to 85.8°F (29.9°C).

What is the average humidity in September in Rolla?

The average relative humidity in September in Rolla, Kansas, is 51%.

How much does it rain in Rolla in September?

In September, in Rolla, the rain falls for 9.9 days. Throughout September, 1.02" (26mm) of precipitation is accumulated.

Does it snow in Rolla in September?

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

When it does not snow in Rolla?

May through September are months without snowfall.

How many hours of daylight does Rolla have in September?

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

How many hours of sunshine does Rolla have in September?

In Rolla, the average sunshine in September is 9.3h.

What is the UV index intensity in September in Rolla?

In Rolla, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.
Average temperature in September - Rolla, KS
  • Average high temperature in September: 84.4°F

The warmest month (with the highest average high temperature) is July (94.1°F).
The month with the lowest average high temperature is December (46.4°F).

  • Average low temperature in September: 62.8°F

The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is December (28°F).

Average pressure in September - Rolla, KS
  • Average pressure in September: 29.94"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.81").

Average wind speed in September - Rolla, KS
  • Average wind speed in September: 11.7mph

The windiest month (with the highest average wind speed) is April (13mph).
The calmest months (with the lowest average wind speed) are January and August (10.4mph).

Average humidity in September - Rolla, KS
  • Average humidity in September: 51%

The month with the highest relative humidity is December (58%).
The month with the lowest relative humidity is June (45%).

Average rainfall in September - Rolla, KS
  • Average rainfall in September: 1.02"

The wettest month (with the highest rainfall) is June (2.17").
The driest month (with the least rainfall) is November (0.31").

Average rainfall days in September - Rolla, KS
  • Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is November (2.4 days).

Average snowfall in September - Rolla, KS
  • Average snowfall in September: 0"

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

Average snowfall days in September - Rolla, KS
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.6 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Rolla, KS
  • 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: 9.3h

The month with the most sunshine is June (Average sunshine: 11.7h).
The month with the least sunshine is December (Average sunshine: 6.8h).

Average sunshine days in September - Rolla, KS
  • Average sunshine days in September: 16 days

The month with the most sunshine days is November (26.1 days).
The month with the least sunshine days is July (10.8 days).

Average UV index in September - Rolla, KS
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 2).

Average cloud cover in September - Rolla, KS
  • Average cloud cover in September: 18

The month with the most cloud cover is February (Cloud cover 27).
The month with the least cloud cover is June (Cloud cover 15).

Average visibility in September - Rolla, KS
  • Average visibility in September: 6mi

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