September weather forecast and climate
Brewster, FL

Weather in September

The first month of the autumn, September, is still a tropical month in Brewster, Florida, with average temperature fluctuating between 73.6°F (23.1°C) and 88°F (31.1°C).

Temperature

In Brewster, the average high-temperature is almost the same as in August - a still tropical 88°F (31.1°C). In Brewster, Florida, in September, the average low-temperature is 73.6°F (23.1°C).

Heat index

The average heat index is calculated to a scorching 106.2°F (41.2°C). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, differences in body mass, height, and shape, wind). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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. Excessive warmth is eliminated from the body by evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

With an average relative humidity of 80%, September is the most humid month.

Rainfall

In Brewster, during September, the rain falls for 23.5 days and regularly aggregates up to 4.09" (104mm) of precipitation. Throughout the year, in Brewster, there are 195.2 rainfall days, and 35.47" (901mm) of precipitation is accumulated.

Daylight

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

Sunshine

In September, the average sunshine in Brewster is 8.8h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
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.
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FAQ

What is the temperature in September in Brewster?

In Brewster, Florida, in September, the average high-temperature is 88°F (31.1°C), and the average low-temperature is 73.6°F (23.1°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), that combines air temperature and relative humidity, is calculated to 106.2°F (41.2°C).

What is the most humid month in Brewster?

The most humid month is September, with an average relative humidity of 80%.

What is the average humidity in September in Brewster?

In September, the average relative humidity is 80%.

How many days does it rain in September in Brewster?

In September, in Brewster, Florida, the rain falls for 23.5 days. Throughout September, 4.09" (104mm) of precipitation is accumulated.

How many hours of daylight does Brewster have in September?

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

How long on average sun shines in September in Brewster?

In September, the average sunshine in Brewster is 8.8h.

What is the month with the highest UV index in Brewster?

Months with the highest UV index in Brewster are May through September, with an average maximum UV index of 7.

What is the UV index reading in September in Brewster?

In September, the average daily maximum UV index in Brewster, Florida, is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Brewster, FL

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

The warmest month (with the highest average high temperature) is August (89.8°F).
The month with the lowest average high temperature is January (70.2°F).

  • Average low temperature in September: 73.6°F

The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (52.2°F).

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Average pressure in September
Brewster, FL

Average pressure in September - Brewster, FL
  • Average pressure in September: 29.96"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.96").

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Average wind speed in September
Brewster, FL

Average wind speed in September - Brewster, FL
  • Average wind speed in September: 5.2mph

The windiest months (with the highest average wind speed) are January and March (7mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).

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Average humidity in September
Brewster, FL

Average humidity in September - Brewster, FL
  • Average humidity in September: 80%

The month with the highest relative humidity is September (80%).
The month with the lowest relative humidity is March (71%).

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Average rainfall in September
Brewster, FL

Average rainfall in September - Brewster, FL
  • Average rainfall in September: 4.09"

The wettest month (with the highest rainfall) is August (5.98").
The driest month (with the least rainfall) is February (1.1").

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Average rainfall days in September
Brewster, FL

Average rainfall days in September - Brewster, FL
  • Average rainfall days in September: 23.5 days

The month with the highest number of rainy days is July (26.6 days).
The month with the least rainy days is January (9.2 days).

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

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

The month with the longest days is June (Average daylight: 13.9h).
The month with the shortest days is December (Average daylight: 10.4h).

  • Average sunshine in September: 8.8h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is December (Average sunshine: 6.3h).

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Average sunshine days in September
Brewster, FL

Average sunshine days in September - Brewster, FL
  • Average sunshine days in September: 4.5 days

The month with the most sunshine days is January (19.7 days).
The month with the least sunshine days is July (3.1 days).

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Average UV index in September
Brewster, FL

Average UV index in September - Brewster, FL
  • Average UV index in September: 7

Months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).

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Average cloud cover in September
Brewster, FL

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

Months with the most cloud cover are February and December (Cloud cover 34).
The month with the least cloud cover is May (Cloud cover 28).

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Average visibility in September
Brewster, FL

Average visibility in September - Brewster, FL
  • Average visibility in September: 5mi

Months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (6mi).
The month with the lowest visibility is September (5mi).

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