September Weather in Gateway, United States

Last updated: June 24, 2025

In September, the average temperature in Gateway, United States is a cool 8°C (47°F). Expect a chill in the air with minimums dipping to -7°C (19°F), while the mercury can rise to a pleasant 19°C (66°F). Prepare for frequent rain, with an estimated 126 mm (5.0 in) of precipitation over about 18 days. The atmosphere is quite humid, with an average humidity level of 96%.

September Temperature in Gateway

In September in Gateway, the average temperature is 8°C (47°F). Maximum temperatures can reach 19°C (66°F), while minimum temperatures can drop as low as -7°C (19°F). This range makes it essential for travelers to pack layers to stay comfortable during their visit.

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

The chart illustrates September temperature patterns in Gateway, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gateway, September typically has an average temperature of 8°C (47°F), with highs reaching up to 19°C (66°F) and lows dropping to around -7°C (19°F).

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

September Precipitation in Gateway

In Gateway in September, the precipitation amount is 126 mm (5.0 in) spread over 18 days.

September Precipitation Trends in Gateway

The chart displays monthly precipitation patterns in Gateway, 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 Gateway, September typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 18 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 Gateway

In Gateway in September humidity is 96%. With an average temperature of 8°C (47°F), this humidity feels like a chilly blanket wrapping around you, making travel uncomfortable as the dampness seeps into your clothes and lingers in the air, leaving you yearning for warmth and dryness.

September Average Humidity in Gateway

This chart illustrates the average monthly humidity levels in Gateway, 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 Gateway is approximately 96%, 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 Gateway

In Gateway in September, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Gateway for better planning.

Maximum UV Index Levels in Gateway for September

The chart shows the monthly maximum UV Index (UVI) for Gateway 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 Gateway typically reaches 4, which falls under the moderate exposure category.

Data source: Gateway 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 Gateway Compares to Other Months

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

This table compares monthly weather conditions in Gateway, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-11°C (12°F)	65 mm (2.6 inches)	94%	low
February Weather	-9°C (16°F)	64 mm (2.5 inches)	93%	low
March Weather	-6°C (21°F)	60 mm (2.4 inches)	91%	moderate
April Weather	1°C (34°F)	49 mm (1.9 inches)	85%	moderate
May Weather	7°C (45°F)	73 mm (2.9 inches)	88%	high
June Weather	12°C (54°F)	86 mm (3.4 inches)	95%	high
July Weather	14°C (58°F)	95 mm (3.7 inches)	102%	high
August Weather	13°C (55°F)	147 mm (5.8 inches)	100%	moderate
September Weather	8°C (47°F)	126 mm (5.0 inches)	96%	moderate
October Weather	2°C (35°F)	156 mm (6.1 inches)	91%	low
November Weather	-7°C (19°F)	98 mm (3.9 inches)	95%	low
December Weather	-8°C (18°F)	119 mm (4.7 inches)	96%	low