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September Weather in Sylva, United States

Last updated: June 24, 2025

In September, the average temperature in Sylva, United States is a pleasant 19°C (66°F). You can expect a range from a chilly 3°C (38°F) to a warm 30°C (86°F). Be prepared for about 124 mm (4.9 in) of rainfall spread over 11 days, contributing to an average humidity of 76%.

September Temperature in Sylva

In September in Sylva, the average temperature is 19°C (66°F), with maximums reaching 30°C (86°F) and minimums dropping as low as 3°C (38°F). This makes it an ideal time for travelers who enjoy mild weather and the potential for warm sunny days.

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

The chart illustrates September temperature patterns in Sylva, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sylva, September typically has an average temperature of 19°C (66°F), with highs reaching up to 30°C (86°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec374347546267706966574541
Data source: Temperature data for Sylva 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 Sylva

In Sylva in September, the precipitation amount is 124 mm (4.9 in) over the course of 11 days.

September Precipitation Trends in Sylva

The chart displays monthly precipitation patterns in Sylva, 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 Sylva, September typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec1111741351361319610012812415093143
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sylva

In Sylva in September, humidity is 76%. With an average temperature of 19°C (66°F), this humidity feels like a warm, thick blanket wrapping around you, making travel mildly uncomfortable and encouraging frequent breaks in shaded or air-conditioned areas.

September Average Humidity in Sylva

This chart illustrates the average monthly humidity levels in Sylva, 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 Sylva is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sylva

In Sylva in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Sylva.

Maximum UV Index Levels in Sylva for September

The chart shows the monthly maximum UV Index (UVI) for Sylva 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 Sylva typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478111211111110864
Data source: Sylva 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 Sylva Compares to Other Months

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

This table compares monthly weather conditions in Sylva, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)111 mm (4.4 inches)86%moderate
February Weather6°C (43°F)174 mm (6.9 inches)86%high
March Weather8°C (47°F)135 mm (5.3 inches)86%very high
April Weather12°C (54°F)136 mm (5.3 inches)82%extreme
May Weather16°C (62°F)131 mm (5.1 inches)85%extreme
June Weather19°C (67°F)95 mm (3.8 inches)85%extreme
July Weather21°C (70°F)100 mm (4.0 inches)83%extreme
August Weather21°C (69°F)128 mm (5.1 inches)76%extreme
September Weather19°C (66°F)124 mm (4.9 inches)76%very high
October Weather14°C (58°F)150 mm (5.9 inches)80%very high
November Weather7°C (45°F)93 mm (3.7 inches)88%high
December Weather5°C (41°F)143 mm (5.6 inches)88%moderate

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