September weather forecast
Rio, GA

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Weather in September

September, the first month of the autumn in Rio, is still a warm month, with an average temperature varying between 84°F (28.9°C) and 65.5°F (18.6°C).

Temperature

Rio starts September with an average high-temperature of a warm 84°F (28.9°C), hinting at a minimal fluctuation from August. Rio, during September nights, observes an average temperature of 65.5°F (18.6°C).

Heat index

The average heat index in September is estimated at a tropical 91.4°F (33°C). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. 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. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.

Humidity

The average relative humidity in September is 73%.

Rainfall

In Rio, in September, it is raining for 13.8 days, with typically 2.44" (62mm) of accumulated precipitation. In Rio, during the entire year, the rain falls for 179.6 days and collects up to 39.84" (1012mm) of precipitation.

Snowfall

In Rio, Georgia, snow does not fall in April through October.

Daylight

The average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 7:12 am and sunset at 8:02 pm. On the last day of September, sunrise is at 7:31 am and sunset at 7:22 pm EDT.

Sunshine

In Rio, the average sunshine in September is 8.5h.

UV index

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 ordinary person.
Note: In September, an average UV index of 5 transforms into the following instructions:
Heed the precautions - Suggestions to avoid sunburn are made. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Updated: Jun 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot does it get in September?

In September, the average high-temperature and low-temperature are 84°F (28.9°C) and 65.5°F (18.6°C) respectively. The average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, in September is estimated at 91.4°F (33°C).

What is the average humidity in September?

The average relative humidity in September is 73%.

How much does it rain in September?

In Rio, in September, during 13.8 rainfall days, 2.44" (62mm) of precipitation is typically accumulated.

When it does not snow?

April through October are months without snowfall.

What is the average length of the day in September?

In Rio, the average day length in September is 12h and 22min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 7:12 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:22 pm EDT.

How many hours of sunshine does Rio have in September?

In September, the average sunshine duration is 8.5h.

How high is the UV index in September in Rio?

In Rio, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health 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
Rio, GA

Average temperature in September - Rio, GA
  • Average high temperature in September: 84°F

The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is January (52.2°F).

  • Average low temperature in September: 65.5°F

The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (36.1°F).

Average pressure in September
Rio, GA

Average pressure in September - Rio, GA
  • 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 (29.99"Hg).

Average wind speed in September
Rio, GA

Average wind speed in September - Rio, GA
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is January (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).

Average humidity in September
Rio, GA

Average humidity in September - Rio, GA
  • Average humidity in September: 73%

The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are October and November (72%).

Average rainfall in September
Rio, GA

Average rainfall in September - Rio, GA
  • Average rainfall in September: 2.44"

The wettest month (with the highest rainfall) is August (4.61").
The driest month (with the least rainfall) is October (2.09").

Average rainfall days in September
Rio, GA

Average rainfall days in September - Rio, GA
  • Average rainfall days in September: 13.8 days

The month with the highest number of rainy days is July (22.6 days).
The month with the least rainy days is October (9.3 days).

Average snowfall in September
Rio, GA

Average snowfall in September - Rio, GA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.47").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Rio, GA

Average snowfall days in September - Rio, GA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (1 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
Rio, GA

Average daylight in September / Average sunshine in September - Rio, GA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

Average sunshine days in September
Rio, GA

Average sunshine days in September - Rio, GA
  • Average sunshine days in September: 14.8 days

The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is July (7.4 days).

Average UV index in September
Rio, GA

Average UV index in September - Rio, GA
  • Average UV index in September: 5

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).

Average cloud cover in September
Rio, GA

Average cloud cover in September - Rio, GA
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 45).
The months with the least cloud cover are June, September and October (Cloud cover 31).

Average visibility in September
Rio, GA

Average visibility in September - Rio, GA
  • 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).

Rio, Georgia, USA

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