September Weather in Southwick, United States

Last updated: June 24, 2025

In September, the average temperature in Southwick, United States hovers around 19°C (66°F). Expect a minimum of 3°C (38°F) and a potential maximum of 33°C (92°F), giving you a range perfect for various activities. During the month, anticipate 114 mm (4.5 in) of precipitation spread over 9 days, and enjoy a comfortable average humidity of 68%.

September Temperature in Southwick

In September in Southwick, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (92°F), while minimums can dip as low as 3°C (38°F). This variety in weather makes Southwick an ideal destination for travelers seeking both warm and cool experiences.

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

The chart illustrates September temperature patterns in Southwick, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Southwick, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Southwick

In Southwick in September, the precipitation amount is 114 mm (4.5 in) over the course of 9 days.

September Precipitation Trends in Southwick

The chart displays monthly precipitation patterns in Southwick, 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 Southwick, September typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 9 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 Southwick

In Southwick in September humidity is 68%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, creating a sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Southwick

This chart illustrates the average monthly humidity levels in Southwick, 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 Southwick is approximately 68%, 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 Southwick

In Southwick 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 Southwick.

Maximum UV Index Levels in Southwick for September

The chart shows the monthly maximum UV Index (UVI) for Southwick 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 Southwick typically reaches 8, which falls under the very high exposure category.

Data source: Southwick 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 Southwick Compares to Other Months

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

This table compares monthly weather conditions in Southwick, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	73 mm (2.9 inches)	84%	moderate
February Weather	0°C (32°F)	91 mm (3.6 inches)	82%	moderate
March Weather	3°C (38°F)	87 mm (3.4 inches)	81%	high
April Weather	9°C (49°F)	138 mm (5.5 inches)	78%	very high
May Weather	15°C (60°F)	116 mm (4.6 inches)	69%	very high
June Weather	20°C (69°F)	83 mm (3.3 inches)	69%	very high
July Weather	23°C (74°F)	143 mm (5.6 inches)	62%	very high
August Weather	23°C (73°F)	94 mm (3.7 inches)	65%	very high
September Weather	19°C (66°F)	114 mm (4.5 inches)	68%	very high
October Weather	13°C (56°F)	145 mm (5.7 inches)	74%	high
November Weather	5°C (42°F)	92 mm (3.6 inches)	82%	moderate
December Weather	1°C (34°F)	121 mm (4.8 inches)	80%	low