September weather forecast
Brewster, FL

The first month of the autumn, September, is also a hot month in Brewster, Florida, with temperature in the range of an average low of 73.6°F (23.1°C) and an average high of 88°F (31.1°C).

Temperature

With September's arrival, Brewster notes an average high-temperature of a still hot 88°F (31.1°C), closely following the trend of the preceding month. Throughout the nights in September, Brewster experiences an average low-temperature of 73.6°F (23.1°C).

Heat index

The average heat index in September is computed to be a scorching 105.8°F (41°C). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.
Understand that the heat index values take into account shaded locations and mild winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

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

Rainfall

In September, the rain falls for 23.5 days. Throughout September, 4.09" (104mm) of precipitation is accumulated. In Brewster, during the entire year, the rain falls for 195.2 days and collects up to 35.47" (901mm) of precipitation.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of September, sunrise is at 7:07 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:14 pm EDT.

Sunshine

The average sunshine in September is 8.8h.

UV index

The months with the highest UV index in Brewster are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.