Jacksonville
Georgia, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Jacksonville, GA

September, the first month of the autumn, in Jacksonville, is still a warm month, with average temperature fluctuating between 68.4°F (20.2°C) and 84.7°F (29.3°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a moderately hot 84.7°F (29.3°C). The average low-temperature, in Jacksonville, Georgia, is 68.4°F (20.2°C).

Heat index

In September, the average heat index is estimated at a hot 94.5°F (34.7°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, differences in body mass, height, and shape, clothing, and pregnancy affect individual temperature impact. 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in September is 76%.

Rainfall

In September, the rain falls for 13.3 days. Throughout September, 0.91" (23mm) of precipitation is accumulated. In Jacksonville, during the entire year, the rain falls for 134.5 days and collects up to 14.61" (371mm) of precipitation.

Snowfall

March through December are months without snowfall.

Daylight

In Jacksonville, the average length of the day in September is 12.3h.

Sunshine

In September, the average sunshine in Jacksonville is 8.7h.

UV index

In Jacksonville, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 Jacksonville?

The average high-temperature, in September, in Jacksonville, Georgia, is 84.7°F (29.3°C), while the average low-temperature is 68.4°F (20.2°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines air temperature and relative humidity, in September is estimated at 94.5°F (34.7°C).

What is the average humidity in September in Jacksonville?

In September, the average relative humidity in Jacksonville, Georgia, is 76%.

How much does it rain in Jacksonville in September?

In Jacksonville, Georgia, during September, the rain falls for 13.3 days and regularly aggregates up to 0.91" (23mm) of precipitation.

When it does not snow in Jacksonville?

In Jacksonville, Georgia, snow does not fall in March through December.

How many hours of daylight does Jacksonville have in September?

In September, the average length of the day in Jacksonville is 12.3h.

How long on average sun shines in September in Jacksonville?

The average sunshine in September in Jacksonville, Georgia, is 8.7h.

What is the UV index intensity in September in Jacksonville?

The average daily maximum UV index in September in Jacksonville, Georgia, is 6. A UV Index of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Jacksonville, GA
  • Average high temperature in September: 84.7°F

The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (57.4°F).

  • Average low temperature in September: 68.4°F

Months with the highest average low temperature are July and August (73°F).
The coldest month (with the lowest average low temperature) is January (40.6°F).

Average humidity in September - Jacksonville, GA
  • Average humidity in September: 76%

Months with the highest relative humidity are August and December (77%).
Months with the lowest relative humidity are January, October and November (72%).

Average rainfall in September - Jacksonville, GA
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is August (1.89").
The driest month (with the least rainfall) is November (0.71").

Average rainfall days in September - Jacksonville, GA
  • Average rainfall days in September: 13.3 days

The month with the highest number of rainy days is July (18.9 days).
The month with the least rainy days is November (5.5 days).

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

Months with the highest snowfall are January and February (0.04").
Months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

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

The month with the highest number of snowfall days is January (0.3 days).
Months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

Average daylight in September / Average sunshine in September - Jacksonville, GA
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.2h).
The month with the shortest days is December (Average daylight: 10.1h).

  • Average sunshine in September: 8.7h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is December (Average sunshine: 5.4h).

Average UV index in September - Jacksonville, GA
  • Average UV index in September: 6

Months with the highest UV index are May, June and July (UV index 7).
Months with the lowest UV index are January and December (UV index 3).