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September Weather in Etna, United States

Last updated: June 24, 2025

The average temperature in Etna, United States during September is a mild 16°C (61°F). Throughout the month, temperatures can swing from a chilly -2°C (28°F) to a warm 35°C (95°F). Expect 22 mm (0.9 in) of precipitation spread over 4 days, with an average humidity level of around 62%.

September Temperature in Etna

In September in Etna, the average temperature is 16°C (61°F), with maximums reaching 35°C (95°F) and minimums dropping as low as -2°C (28°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their visit.

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

The chart illustrates September temperature patterns in Etna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Etna, September typically has an average temperature of 16°C (61°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec353639455362716961504034
Data source: Temperature data for Etna 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 Etna

In Etna in September, the precipitation amount is 22 mm (0.9 in) over a duration of 4 days.

September Precipitation Trends in Etna

The chart displays monthly precipitation patterns in Etna, 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 Etna, September typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec161147120816320811224696120
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Etna

In Etna in September, humidity is 62%. With an average temperature of 16°C (61°F), this humidity feels like a gentle blanket, making traveling comfortable yet occasionally sticky, prompting the need for light, breathable clothing to fully enjoy the sights.

September Average Humidity in Etna

This chart illustrates the average monthly humidity levels in Etna, 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 Etna is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Etna

In Etna 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 Etna.

Maximum UV Index Levels in Etna for September

The chart shows the monthly maximum UV Index (UVI) for Etna 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 Etna typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589111111109643
Data source: Etna 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 Etna Compares to Other Months

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

This table compares monthly weather conditions in Etna, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)161 mm (6.3 inches)86%moderate
February Weather2°C (36°F)147 mm (5.8 inches)85%moderate
March Weather4°C (39°F)120 mm (4.7 inches)85%very high
April Weather7°C (46°F)81 mm (3.2 inches)82%very high
May Weather12°C (53°F)63 mm (2.5 inches)81%extreme
June Weather17°C (62°F)20 mm (0.8 inches)79%extreme
July Weather22°C (71°F)8 mm (0.3 inches)70%extreme
August Weather21°C (69°F)11 mm (0.4 inches)60%very high
September Weather16°C (61°F)22 mm (0.9 inches)62%very high
October Weather10°C (50°F)46 mm (1.8 inches)72%high
November Weather4°C (40°F)96 mm (3.8 inches)87%moderate
December Weather1°C (34°F)120 mm (4.7 inches)86%moderate

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