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September Weather in Syracuse, United States

Last updated: June 24, 2025

In Syracuse, United States, the average temperature in September is a pleasant 22°C (72°F). Enjoy warm days, as temperatures can range from a cool 2°C (36°F) to a sizzling 39°C (102°F). Expect some occasional showers, with an average precipitation of 37 mm (1.5 in) spread over about 4 days. Don't forget to stay hydrated, as the average humidity is a high 79%!

September Temperature in Syracuse

In September in Syracuse, the average temperature is 22°C (72°F). Maximums can reach 39°C (102°F), while minimums can dip as low as 2°C (36°F). This variation in temperature makes Syracuse a destination where travelers should be prepared for both warm days and cool nights.

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

The chart illustrates September temperature patterns in Syracuse, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Syracuse, September typically has an average temperature of 22°C (72°F), with highs reaching up to 39°C (102°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec343446546376797771554537
Data source: Temperature data for Syracuse 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 Syracuse

In Syracuse in September, the precipitation amount is 37 mm (1.5 in) over the course of 4 days.

September Precipitation Trends in Syracuse

The chart displays monthly precipitation patterns in Syracuse, 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 Syracuse, September typically receives around 37 mm (1.5 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec161738389148455937281016
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Syracuse

In Syracuse in September humidity is 79%. With an average temperature of 22°C (72°F), this humidity feels like you are enveloped in a warm, heavy blanket, making it feel considerably hotter and adding a layer of stickiness to your skin as you navigate through the streets.

September Average Humidity in Syracuse

This chart illustrates the average monthly humidity levels in Syracuse, 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 Syracuse is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%77%65%67%81%82%82%84%79%75%79%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Syracuse

In Syracuse 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 Syracuse.

Maximum UV Index Levels in Syracuse for September

The chart shows the monthly maximum UV Index (UVI) for Syracuse 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 Syracuse typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec457101112121110753
Data source: Syracuse 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 Syracuse Compares to Other Months

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

This table compares monthly weather conditions in Syracuse, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)16 mm (0.6 inches)74%moderate
February Weather1°C (34°F)16 mm (0.6 inches)77%moderate
March Weather8°C (47°F)38 mm (1.5 inches)65%high
April Weather12°C (54°F)38 mm (1.5 inches)67%very high
May Weather17°C (63°F)91 mm (3.6 inches)81%extreme
June Weather24°C (76°F)48 mm (1.9 inches)82%extreme
July Weather26°C (80°F)45 mm (1.8 inches)82%extreme
August Weather25°C (77°F)59 mm (2.3 inches)84%extreme
September Weather22°C (72°F)37 mm (1.5 inches)79%very high
October Weather13°C (55°F)28 mm (1.1 inches)75%high
November Weather7°C (45°F)10 mm (0.4 inches)79%moderate
December Weather3°C (37°F)16 mm (0.6 inches)83%moderate

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