September Weather in Bath, United States

Last updated: June 24, 2025

In Bath, United States, the average temperature in September hovers around 18°C (65°F), with fluctuations ranging from a cool 1°C (35°F) to a warm 34°C (94°F). During this month, expect about 94 mm (3.7 in) of precipitation over approximately 10 days, and enjoy a high average humidity of 80%.

September Temperature in Bath

In September in Bath, the average temperature is 18°C (65°F). Maximums can reach 34°C (94°F), while minimums can dip as low as 1°C (35°F). This variety in temperatures makes it essential for travelers to pack layers to stay comfortable throughout their visit.

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

The chart illustrates September temperature patterns in Bath, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bath, September typically has an average temperature of 18°C (65°F), with highs reaching up to 34°C (94°F) and lows dropping to around 1°C (35°F).

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

September Precipitation in Bath

In Bath in September, the precipitation amount is 94 mm (3.7 in) over a duration of 10 days.

September Precipitation Trends in Bath

The chart displays monthly precipitation patterns in Bath, 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 Bath, September typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 10 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 Bath

In Bath in September, humidity is 80%. With an average temperature of 18°C (65°F), this humidity feels like wandering through a warm, damp blanket, making every step slightly heavy and resulting in a constant sheen of sweat, which can be both refreshing and exhausting for travelers.

September Average Humidity in Bath

This chart illustrates the average monthly humidity levels in Bath, 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 Bath is approximately 80%, 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 Bath

In Bath in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Bath.

Maximum UV Index Levels in Bath for September

The chart shows the monthly maximum UV Index (UVI) for Bath 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 Bath typically reaches 7, which falls under the high exposure category.

Data source: Bath 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 Bath Compares to Other Months

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

This table compares monthly weather conditions in Bath, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (26°F)	65 mm (2.6 inches)	88%	low
February Weather	-3°C (27°F)	68 mm (2.7 inches)	87%	moderate
March Weather	3°C (37°F)	68 mm (2.7 inches)	85%	moderate
April Weather	8°C (47°F)	89 mm (3.5 inches)	86%	very high
May Weather	15°C (60°F)	125 mm (4.9 inches)	80%	very high
June Weather	21°C (70°F)	106 mm (4.2 inches)	80%	very high
July Weather	24°C (75°F)	82 mm (3.2 inches)	80%	very high
August Weather	22°C (72°F)	66 mm (2.6 inches)	80%	very high
September Weather	18°C (65°F)	94 mm (3.7 inches)	80%	high
October Weather	12°C (53°F)	118 mm (4.6 inches)	84%	moderate
November Weather	4°C (39°F)	67 mm (2.6 inches)	89%	moderate
December Weather	0°C (32°F)	59 mm (2.3 inches)	86%	low