Bristol
Florida, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Bristol, FL

The first month of the autumn, September, is also a hot month in Bristol, Florida, with temperature in the range of an average low of 70.2°F (21.2°C) and an average high of 87.3°F (30.7°C).

Temperature

In Bristol, the average high-temperature is almost the same as in August - a still hot 87.3°F (30.7°C). In Bristol, in September, the average low-temperature is 70.2°F (21.2°C).

Heat index

The average heat index is estimated at a sweltering 102.6°F (39.2°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
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', 'feels like', 'apparent temperature', 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, metabolic differences, clothing, and wind 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 particularly important for children. 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

Months with the highest humidity are September and December, with an average relative humidity of 78%.

Rainfall

In Bristol, during September, the rain falls for 14.3 days and regularly aggregates up to 1.73" (44mm) of precipitation. In Bristol, during the entire year, the rain falls for 140 days and collects up to 19.8" (503mm) of precipitation.

Snowfall

April through December are months without snowfall.

Daylight

The average length of the day in September is 12.3h.

Sunshine

The average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index in Bristol is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Bristol?

In September, in Bristol, Florida, the average high-temperature is 87.3°F (30.7°C), and the average low-temperature is 70.2°F (21.2°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), that factores the actual air temperature with the relative humidity, is estimated at 102.6°F (39.2°C).

What are the most humid months in Bristol?

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

What is the average humidity in September in Bristol?

In September, the average relative humidity in Bristol, Florida, is 78%.

How many days does it rain in September in Bristol?

In September, in Bristol, Florida, the rain falls for 14.3 days. Throughout September, 1.73" (44mm) of precipitation is accumulated.

When it does not snow in Bristol?

In Bristol, Florida, snow does not fall in April through December.

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

The average length of the day in September in Bristol is 12.3h.

How many hours of sunshine does Bristol have in September?

The average sunshine in September in Bristol, Florida, is 8.7h.

What is the UV index reading in September in Bristol?

The average daily maximum UV index in September in Bristol, Florida, is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - Bristol, FL
  • Average high temperature in September: 87.3°F

The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (60.4°F).

  • Average low temperature in September: 70.2°F

The month with the highest average low temperature is August (74.7°F).
The coldest month (with the lowest average low temperature) is January (42.4°F).

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

Months with the highest relative humidity are September and December (78%).
The month with the lowest relative humidity is May (72%).

Average rainfall in September - Bristol, FL
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is July (3.07").
The driest month (with the least rainfall) is January (0.71").

Average rainfall days in September - Bristol, FL
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is July (21.6 days).
The month with the least rainy days is November (5 days).

Average snowfall days in September - Bristol, FL
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January, February and March (0.1 days).
Months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).

Average daylight in September / Average sunshine in September - Bristol, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.1h).
The month with the shortest days is December (Average daylight: 10.2h).

  • Average sunshine in September: 8.7h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is December (Average sunshine: 5.4h).

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

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).