September weather forecast
Iona, OK

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Weather in September

September, the first month of the autumn in Iona, is still a warm month, with an average temperature varying between 66°F (18.9°C) and 84.6°F (29.2°C).

Temperature

The arrival of September suggests a slight decrease in the average high-temperature, moving from a hot 93.4°F (34.1°C) in August to a warm 84.6°F (29.2°C). Throughout the month of September, Iona witnesses an average low-temperature of 66°F (18.9°C).

Heat index

The heat index value for September is appraised at a tropical 91.4°F (33°C). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are especially vital to children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.

Humidity

The average relative humidity in September is 68%.

Rainfall

In Iona, in September, it is raining for 13.2 days, with typically 2.83" (72mm) of accumulated precipitation. In Iona, during the entire year, the rain falls for 129 days and collects up to 27.91" (709mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Iona, the average length of the day in September is 12h and 23min.
On the first day of September, sunrise is at 7:01 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:13 pm CDT.

Sunshine

The average sunshine in September is 8.2h.

UV index

In Iona, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: A daily high UV index of 5 in September leads to these guidelines:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is September?

Iona in September has an average high-temperature of 84.6°F (29.2°C) and an average low-temperature of 66°F (18.9°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is appraised at 91.4°F (33°C).

What is the average humidity in September?

In Iona, the average relative humidity in September is 68%.

How many days does it rain in September?

In Iona, in September, it is raining for 13.2 days, with typically 2.83" (72mm) of accumulated precipitation.

When it does not snow?

In Iona, snow does not fall in May through October.

How many hours of daylight does Iona have in September?

The average day length in September is 12h and 23min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 7:01 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:13 pm CDT.

How long on average sun shines in September?

In Iona, the average sunshine duration in September is 8.2h.

How high is the UV index in September?

In Iona, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat 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
Iona, OK

Average temperature in September - Iona, OK
  • Average high temperature in September: 84.6°F

The warmest month (with the highest average high temperature) is August (93.4°F).
The month with the lowest average high temperature is January (50.2°F).

  • Average low temperature in September: 66°F

The month with the highest average low temperature is July (72.7°F).
The coldest month (with the lowest average low temperature) is January (33.4°F).

Average pressure in September
Iona, OK

Average pressure in September - Iona, OK
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in September
Iona, OK

Average wind speed in September - Iona, OK
  • Average wind speed in September: 7.7mph

The windiest months (with the highest average wind speed) are March and April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.6mph).

Average humidity in September
Iona, OK

Average humidity in September - Iona, OK
  • Average humidity in September: 68%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is August (61%).

Average rainfall in September
Iona, OK

Average rainfall in September - Iona, OK
  • Average rainfall in September: 2.83"

The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is January (1.34").

Average rainfall days in September
Iona, OK

Average rainfall days in September - Iona, OK
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is January (6.3 days).

Average snowfall in September
Iona, OK

Average snowfall in September - Iona, OK
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.3").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Iona, OK

Average snowfall days in September - Iona, OK
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Iona, OK

Average daylight in September / Average sunshine in September - Iona, OK
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

Average sunshine days in September
Iona, OK

Average sunshine days in September - Iona, OK
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is January (22.9 days).
The month with the least sunshine days is May (14.3 days).

Average UV index in September
Iona, OK

Average UV index in September - Iona, OK
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).

Average cloud cover in September
Iona, OK

Average cloud cover in September - Iona, OK
  • Average cloud cover in September: 30

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 21).

Average visibility in September
Iona, OK

Average visibility in September - Iona, OK
  • 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).

Iona, Oklahoma, USA

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