September weather forecast
Williamsburg, FL

September, the first month of the autumn in Williamsburg, is still a tropical month, with an average temperature varying between 74.5°F (23.6°C) and 88.5°F (31.4°C).

Temperature

Williamsburg's weather in September displays an average high-temperature of a still tropical 88.5°F (31.4°C), showing minor disparity from August's 91°F (32.8°C). Williamsburg's temperature drops to an average low of 74.5°F (23.6°C) during the nights of September.

Heat index

During September, the heat index is estimated at a scorching 105.8°F (41°C). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
In reference to the heat index, it's for places in shade and with a slight wind. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. 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. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

With an average relative humidity of 77%, September is the most humid month.

Rainfall

In Williamsburg, in September, during 15.4 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, there are 126.6 rainfall days, and 9.06" (230mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of September, sunrise is at 7:04 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:12 pm EDT.

Sunshine

The average sunshine in September in Williamsburg is 8.5h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: During September, 7 as the daily maximum UV index converts into the following advice:
Inhibit overexposure. Warding off sun damage is of utmost importance. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.