September Weather in Syracuse, United States

Last updated: June 24, 2025

In September, the average temperature in Syracuse, United States hovers around 19°C (67°F). Visitors can expect temperatures to range from a cool 4°C (39°F) to a warm 33°C (91°F). With an average precipitation of 76 mm (3.0 in) spread over 8 days, the region sees a humidity level of 78%, adding to the overall tropical ambiance.

September Temperature in Syracuse

In September in Syracuse, the average temperature is 19°C (67°F). Maximum can reach 33°C (91°F) and minimum can be as low as 4°C (39°F). This climate makes Syracuse an ideal destination for travelers seeking mild weather and a variety of outdoor activities.

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 19°C (67°F), with highs reaching up to 33°C (91°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Syracuse

In Syracuse in September, the precipitation amount is 76 mm (3.0 in) spread over a duration of 8 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 76 mm (3.0 inches) of precipitation spread over approximately 8 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 Syracuse

In Syracuse in September humidity is 78%. With an average temperature of 19°C (67°F), this humidity feels like a warm, heavy blanket enveloping you, making traveling feel both sticky and sluggish as you navigate through the day.

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 78%, 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 Syracuse

In Syracuse in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (28°F)	71 mm (2.8 inches)	85%	moderate
February Weather	-2°C (29°F)	75 mm (3.0 inches)	85%	moderate
March Weather	4°C (39°F)	103 mm (4.1 inches)	86%	high
April Weather	9°C (49°F)	98 mm (3.9 inches)	87%	very high
May Weather	16°C (62°F)	133 mm (5.2 inches)	81%	very high
June Weather	22°C (72°F)	121 mm (4.8 inches)	82%	very high
July Weather	24°C (75°F)	117 mm (4.6 inches)	81%	very high
August Weather	22°C (73°F)	105 mm (4.1 inches)	79%	very high
September Weather	19°C (67°F)	76 mm (3.0 inches)	78%	very high
October Weather	13°C (55°F)	121 mm (4.8 inches)	81%	high
November Weather	4°C (40°F)	80 mm (3.2 inches)	89%	moderate
December Weather	1°C (34°F)	61 mm (2.4 inches)	86%	moderate