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September Weather in Bath, United States

Last updated: June 24, 2025

In Bath, United States, the average temperature in September hovers around 17°C (64°F). However, be prepared for fluctuations, as it can dip to a chilly 4°C (39°F) and soar to a warm 30°C (86°F). During this month, expect about 71 mm (2.8 in) of precipitation over 7 days, coupled with an average humidity level of 80%. Plan accordingly to make the most of your time!

September Temperature in Bath

In September in Bath, the average temperature is 17°C (64°F). Maximums can reach 30°C (86°F), while minimums can be as low as 4°C (39°F). This mild climate makes Bath an excellent destination for travelers seeking pleasant weather.

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 17°C (64°F), with highs reaching up to 30°C (86°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec262733445464707063534030
Data source: Temperature data for Bath generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Bath

In Bath in September, the precipitation amount is 71 mm (2.8 in) over a span of 7 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 71 mm (2.8 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec84857111873611107471128111121
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bath

In Bath in September, humidity is 80%. With an average temperature of 17°C (64°F), this humidity feels like a warm blanket wrapping around you, making travel somewhat uncomfortable as the air feels heavy and oppressive.

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.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%84%79%79%86%85%83%80%77%80%81%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
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.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)84 mm (3.3 inches)85%low
February Weather-3°C (27°F)85 mm (3.3 inches)86%moderate
March Weather1°C (33°F)71 mm (2.8 inches)84%moderate
April Weather7°C (44°F)118 mm (4.6 inches)79%high
May Weather12°C (54°F)73 mm (2.9 inches)79%very high
June Weather18°C (65°F)61 mm (2.4 inches)86%very high
July Weather21°C (71°F)110 mm (4.3 inches)85%very high
August Weather21°C (71°F)74 mm (2.9 inches)83%very high
September Weather17°C (64°F)71 mm (2.8 inches)80%high
October Weather12°C (53°F)128 mm (5.1 inches)77%moderate
November Weather4°C (40°F)111 mm (4.4 inches)80%moderate
December Weather-1°C (30°F)121 mm (4.8 inches)81%low

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