September weather forecast
Clearwater, FL

September paves the way for the closing phase of the summers in Clearwater. The frequency of rain begins to decrease, resulting in few sunny days, while the temperatures start a gentle dip after their summer peak. Supplementary hours of sunshine during the day maintain the city's vivacious charm and warmth. September experiences a minor drop in sea temperature, falling to 84.7°F (29.3°C) but still remaining pleasantly warm for beach outgoing’s. The decrease in rainfall coupled with persistent pleasing temperatures makes September alluring for visitors longing for a blend of summer and fall.

Temperature

Clearwater's weather in September indicates an average high-temperature of a still hot 86.2°F (30.1°C), nearly consistent with the 87.6°F (30.9°C) of August. Nighttime readings during September register a minimal drop from daytime highs, averaging at a moderately hot 77.9°F (25.5°C).

Heat index

The heat index value for September is evaluated at a very hot 96.8°F (36°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Clearwater, in September, during 20.7 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. In Clearwater, Florida, during the entire year, the rain falls for 149.9 days and collects up to 16.18" (411mm) of precipitation.

Ocean temperature

In Clearwater, in September, the average water temperature is 84.7°F (29.3°C).
Note: Swimming, diving, and other activities in water temperatures between 77°F (25°C) and 84.2°F (29°C) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.

Daylight

In September, the average length of the day in Clearwater is 12h and 19min.
On the first day of the month, sunrise is at 7:10 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:18 pm EDT.

Sunshine

The average sunshine in September is 9.1h.

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 health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index, 7 during September, leads to the following recommendations:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Take caution! The UV rays from the Sun gain strength from sand and water reflections.