September weather forecast
Gainesville, FL

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A colorful neon-lit houses, cars, and trees on a clear street in Gainesville, Florida
A colorful neon-lit houses, cars, and trees on a clear street in Gainesville, Florida

Weather in September

The city of Gainesville welcomes aggressive rainfall accompanied by a slight decrease in temperatures during September. Comparing to the climatic pattern of August, a noticeable change in temperature can be observed. The cloud cover visibly increases, shading the city under their grey envelope. September records a plummet in rainfall measurements, marked down to 1.3" (33mm) from August's substantial 2.8" (71mm). This month signifies a transition from a hot, humid summer to a more calm, cooler fall.

Temperature

Gainesville notes an average high-temperature of a still tropical 88°F (31.1°C) in September, displaying minor variation from August. During September nights, Gainesville witnesses a consistent average temperature of 72.3°F (22.4°C).

Heat index

The average heat index in September is estimated at a blisteringly hot 105.8°F (41°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', measures the perceived warmth when incorporating the humidity present in the air. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The months with the highest humidity are August and September, with an average relative humidity of 78%.

Rainfall

In Gainesville, in September, it is raining for 13.3 days, with typically 1.3" (33mm) of accumulated precipitation. In Gainesville, during the entire year, the rain falls for 150.7 days and collects up to 23.78" (604mm) of precipitation.

Daylight

In Gainesville, Florida, the average length of the day in September is 12h and 20min.
On the first day of September, sunrise is at 7:06 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:15 pm EDT.

Sunshine

In September, the average sunshine is 8.6h.

UV index

In Gainesville, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A typical high UV index of 6 in September suggests the following recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
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Frequently asked questions

Is it hot in Gainesville during September?

The average high-temperature and low-temperature in Gainesville, Florida, during September are 88°F (31.1°C) and 72.3°F (22.4°C) respectively. The average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, in September is estimated at 105.8°F (41°C).

What are the most humid months in Gainesville?

August and September, with an average relative humidity of 78%, are most humid months in Gainesville.

What is the average humidity in September in Gainesville?

The average relative humidity in September in Gainesville is 78%.

How many days does it rain in September in Gainesville?

In Gainesville, in September, it is raining for 13.3 days, with typically 1.3" (33mm) of accumulated precipitation.

What is the average length of the day in September in Gainesville?

In Gainesville, Florida, the average day length in September is 12h and 20min.

When is the sunrise / sunset in September in Gainesville?

On the first day of September in Gainesville, sunrise is at 7:06 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:15 pm EDT.

How long on average sun shines in September in Gainesville?

The average sunshine duration in September in Gainesville is 8.6h.

How high is the UV index in September in Gainesville?

In Gainesville, Florida, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Gainesville, FL

Average temperature in September - Gainesville, FL
  • Average high temperature in September: 88°F

The warmest month (with the highest average high temperature) is August (90.7°F).
The month with the lowest average high temperature is January (64.4°F).

  • Average low temperature in September: 72.3°F

The month with the highest average low temperature is August (75°F).
The coldest month (with the lowest average low temperature) is January (46.2°F).

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Average pressure in September
Gainesville, FL

Average pressure in September - Gainesville, FL
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).

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Average wind speed in September
Gainesville, FL

Average wind speed in September - Gainesville, FL
  • Average wind speed in September: 4.9mph

The windiest month (with the highest average wind speed) is April (6.4mph).
The calmest month (with the lowest average wind speed) is July (4.5mph).

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Average humidity in September
Gainesville, FL

Average humidity in September - Gainesville, FL
  • Average humidity in September: 78%

The months with the highest relative humidity are August and September (78%).
The month with the lowest relative humidity is March (71%).

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Average rainfall in September
Gainesville, FL

Average rainfall in September - Gainesville, FL
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is July (3.5").
The driest month (with the least rainfall) is November (1.26").

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Average rainfall days in September
Gainesville, FL

Average rainfall days in September - Gainesville, FL
  • Average rainfall days in September: 13.3 days

The month with the highest number of rainy days is July (20.6 days).
The month with the least rainy days is November (7.5 days).

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Average daylight in September /
Average sunshine in September
Gainesville, FL

Average daylight in September / Average sunshine in September - Gainesville, FL
  • Average daylight in September: 12h and 2min

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

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in September
Gainesville, FL

Average sunshine days in September - Gainesville, FL
  • Average sunshine days in September: 15.9 days

The months with the most sunshine days are January and November (20.8 days).
The months with the least sunshine days are June and July (9.2 days).

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Average UV index in September
Gainesville, FL

Average UV index in September - Gainesville, FL
  • Average UV index in September: 6

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

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Average cloud cover in September
Gainesville, FL

Average cloud cover in September - Gainesville, FL
  • Average cloud cover in September: 33

The month with the most cloud cover is December (Cloud cover 38).
The months with the least cloud cover are May and October (Cloud cover 29).

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Average visibility in September
Gainesville, FL

Average visibility in September - Gainesville, FL
  • 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).

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Gainesville, Florida, USA

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