September Weather in Porter, United States

Last updated: June 24, 2025

In September, the average temperature in Porter, United States hovers around 25°C (77°F), with minimum lows dipping to 9°C (48°F) and maximum highs soaring to 37°C (99°F). Expect 88 mm (3.4 in) of precipitation spread over approximately 6 days, while the average humidity settles at a comfortable 64%.

September Temperature in Porter

In September in Porter, the average temperature is 25°C (77°F). The maximum can reach 37°C (99°F), while the minimum can drop as low as 9°C (48°F). Travelers should be prepared for warm weather along with cooler evenings, making it a great time to enjoy outdoor activities and explore the local attractions.

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

The chart illustrates September temperature patterns in Porter, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Porter, September typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (99°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Porter

In Porter in September, the precipitation amount is 88 mm (3.4 in) spread over 6 days, indicating a moderate level of rainfall for the period.

September Precipitation Trends in Porter

The chart displays monthly precipitation patterns in Porter, 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 Porter, September typically receives around 88 mm (3.4 inches) of precipitation spread over approximately 6 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 Porter

In Porter in September, humidity is 64%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace, making outdoor excursions feel a bit heavier, yet still inviting for travelers seeking a vibrant atmosphere.

September Average Humidity in Porter

This chart illustrates the average monthly humidity levels in Porter, 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 Porter is approximately 64%, 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 Porter

In Porter in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Porter.

Maximum UV Index Levels in Porter for September

The chart shows the monthly maximum UV Index (UVI) for Porter 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 Porter typically reaches 9, which falls under the very high exposure category.

Data source: Porter 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 Porter Compares to Other Months

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

This table compares monthly weather conditions in Porter, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (40°F)	84 mm (3.3 inches)	79%	moderate
February Weather	6°C (43°F)	87 mm (3.4 inches)	78%	high
March Weather	12°C (55°F)	116 mm (4.6 inches)	75%	high
April Weather	16°C (60°F)	158 mm (6.2 inches)	75%	very high
May Weather	21°C (71°F)	205 mm (8.1 inches)	83%	very high
June Weather	26°C (80°F)	86 mm (3.4 inches)	81%	extreme
July Weather	28°C (83°F)	88 mm (3.5 inches)	78%	extreme
August Weather	27°C (81°F)	108 mm (4.3 inches)	68%	very high
September Weather	25°C (77°F)	88 mm (3.4 inches)	64%	very high
October Weather	17°C (63°F)	137 mm (5.4 inches)	71%	high
November Weather	11°C (51°F)	59 mm (2.3 inches)	82%	moderate
December Weather	8°C (46°F)	68 mm (2.7 inches)	87%	moderate