September Weather in Clearwater, United States

Last updated: June 24, 2025

In September, the average temperature in Clearwater, United States hovers around 25°C (78°F), offering a delightful climate for outdoor activities. However, temperatures can vary significantly, with a minimum of 11°C (52°F) and a maximum reaching up to 37°C (100°F). Expect about 80 mm (3.1 in) of precipitation spread over 9 days, contributing to an average humidity level of 83%. With these conditions, it's wise to be prepared for both sun and rain!

September Temperature in Clearwater

In September in Clearwater, the average temperature is 25°C (78°F). Maximums can reach 37°C (100°F), while minimums can dip as low as 11°C (52°F). This variability makes it essential to pack accordingly for your travels.

September Weather in Clearwater: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Clearwater, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clearwater, September typically has an average temperature of 25°C (78°F), with highs reaching up to 37°C (100°F) and lows dropping to around 11°C (52°F).

Data source: Temperature data for Clearwater generated using information from the Copernicus Climate Change Service.

September Precipitation in Clearwater

In Clearwater in September, the precipitation amount is 80 mm (3.1 in) spread over 9 days.

September Precipitation Trends in Clearwater

The chart displays monthly precipitation patterns in Clearwater, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Clearwater, September typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Clearwater

In Clearwater in September, humidity is 83%. With an average temperature of 25°C (78°F), this humidity feels like stepping into a warm, damp embrace, making travel sticky and exhausting, as each movement can leave you drenched in sweat.

September Average Humidity in Clearwater

This chart illustrates the average monthly humidity levels in Clearwater, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Clearwater is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Clearwater

In Clearwater in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Clearwater.

Maximum UV Index Levels in Clearwater for September

The chart shows the monthly maximum UV Index (UVI) for Clearwater in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Clearwater typically reaches 9, which falls under the very high exposure category.

Data source: Clearwater September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Clearwater Compares to Other Months

Weather in Clearwater varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Clearwater, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Clearwater, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	84 mm (3.3 inches)	86%	moderate
February Weather	12°C (54°F)	117 mm (4.6 inches)	81%	high
March Weather	15°C (59°F)	85 mm (3.3 inches)	81%	very high
April Weather	19°C (66°F)	108 mm (4.2 inches)	79%	very high
May Weather	23°C (74°F)	102 mm (4.0 inches)	75%	extreme
June Weather	26°C (79°F)	106 mm (4.2 inches)	75%	extreme
July Weather	28°C (82°F)	122 mm (4.8 inches)	80%	extreme
August Weather	27°C (81°F)	130 mm (5.1 inches)	81%	very high
September Weather	25°C (78°F)	80 mm (3.1 inches)	83%	very high
October Weather	21°C (69°F)	88 mm (3.5 inches)	78%	very high
November Weather	13°C (55°F)	64 mm (2.5 inches)	85%	high
December Weather	11°C (51°F)	117 mm (4.6 inches)	87%	moderate