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September Weather in Clearwater, United States

Last updated: June 24, 2025

In September, the average temperature in Clearwater, United States hovers around 17°C (63°F). Expect a wide range, with minimums dipping as low as 1°C (34°F) and maximums soaring up to 32°C (90°F). Be prepared for some rainfall, as 118 mm (4.6 in) of precipitation can be expected over 10 days. With an average humidity level of 81%, the air remains pleasantly moist, enhancing the overall experience.

September Temperature in Clearwater

In September in Clearwater, the average temperature is 17°C (63°F). Maximums can reach 32°C (90°F), while minimums can drop as low as 1°C (34°F). Be prepared for a range of temperatures during 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 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec141531415871737063473121
Data source: Temperature data for Clearwater generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Clearwater

In Clearwater in September, the total precipitation amount is 118 mm (4.6 in) over a span of 10 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 118 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec192651849672961461181053145
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clearwater

In Clearwater in September humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%90%85%84%78%80%81%81%81%84%88%84%
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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
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.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (15°F)19 mm (0.7 inches)87%low
February Weather-10°C (15°F)26 mm (1.0 inches)90%moderate
March Weather0°C (32°F)51 mm (2.0 inches)85%moderate
April Weather5°C (42°F)84 mm (3.3 inches)84%high
May Weather14°C (58°F)96 mm (3.8 inches)78%very high
June Weather21°C (71°F)72 mm (2.8 inches)80%very high
July Weather23°C (74°F)96 mm (3.8 inches)81%very high
August Weather21°C (70°F)146 mm (5.8 inches)81%very high
September Weather17°C (63°F)118 mm (4.6 inches)81%high
October Weather8°C (47°F)105 mm (4.2 inches)84%moderate
November Weather0°C (32°F)30 mm (1.2 inches)88%moderate
December Weather-6°C (22°F)45 mm (1.8 inches)84%low

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