September Weather in Bay, United States

Last updated: June 24, 2025

In September, the average temperature in Bay, United States is a pleasant 24°C (75°F), with a minimum of 9°C (49°F) and a maximum that can soar to 35°C (95°F). You can expect about 90 mm (3.5 in) of precipitation over the course of 7 days, accompanied by an average humidity of 71%.

September Temperature in Bay

In September in Bay, the average temperature is 24°C (75°F). Maximums can reach 35°C (95°F) and minimums can be as low as 9°C (49°F). This varied climate makes it an ideal destination for travelers looking to experience both warm sunny days and cooler evenings.

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

The chart illustrates September temperature patterns in Bay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bay, September typically has an average temperature of 24°C (75°F), with highs reaching up to 35°C (95°F) and lows dropping to around 9°C (49°F).

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

September Precipitation in Bay

In Bay in September, the precipitation amount is 90 mm (3.5 in) over the course of 7 days.

September Precipitation Trends in Bay

The chart displays monthly precipitation patterns in Bay, 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 Bay, September typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Bay

In Bay in September, humidity is 71%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making outdoor activities for traveling both refreshing and sometimes a bit stifling, prompting travelers to seek shaded spots or refreshing drinks while exploring.

September Average Humidity in Bay

This chart illustrates the average monthly humidity levels in Bay, 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 Bay is approximately 71%, 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 Bay

In Bay 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 Bay.

Maximum UV Index Levels in Bay for September

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

Data source: Bay 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 Bay Compares to Other Months

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

This table compares monthly weather conditions in Bay, 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 (41°F)	99 mm (3.9 inches)	84%	moderate
February Weather	6°C (44°F)	170 mm (6.7 inches)	83%	high
March Weather	12°C (54°F)	169 mm (6.7 inches)	81%	high
April Weather	15°C (60°F)	140 mm (5.5 inches)	81%	very high
May Weather	22°C (71°F)	133 mm (5.2 inches)	83%	extreme
June Weather	26°C (78°F)	102 mm (4.0 inches)	83%	extreme
July Weather	28°C (82°F)	97 mm (3.8 inches)	81%	extreme
August Weather	26°C (79°F)	112 mm (4.4 inches)	74%	very high
September Weather	24°C (75°F)	90 mm (3.5 inches)	71%	very high
October Weather	17°C (64°F)	125 mm (4.9 inches)	76%	high
November Weather	10°C (50°F)	82 mm (3.2 inches)	84%	moderate
December Weather	7°C (46°F)	119 mm (4.7 inches)	88%	moderate