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September Weather in South Bristol, United States

Last updated: June 24, 2025

In September, the average temperature in South Bristol, United States hovers around 17°C (62°F), offering a comfortable climate for outdoor activities. Expect minimum temperatures to dip to 9°C (48°F) and rise to a pleasant 23°C (74°F) during the day. Visitors should be prepared for 89 mm (3.5 in) of precipitation spread over approximately 8 days, resulting in a high average humidity of 80%. Enjoy the refreshing atmosphere while you explore!

September Temperature in South Bristol

In September in South Bristol, the average temperature is 17°C (62°F). Maximums can reach 23°C (74°F), and minimums can be as low as 9°C (48°F). This makes South Bristol a pleasant destination to explore with comfortable temperatures, perfect for outdoor activities and sightseeing.

September Weather in South Bristol: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Bristol, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Bristol, September typically has an average temperature of 17°C (62°F), with highs reaching up to 23°C (74°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec303134425059656762544335
Data source: Temperature data for South Bristol 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 South Bristol

In South Bristol in September, the precipitation amount is 89 mm (3.5 in) over a span of 8 days.

September Precipitation Trends in South Bristol

The chart displays monthly precipitation patterns in South Bristol, 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 South Bristol, September typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec981018613884741017490143123138
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Bristol

In South Bristol in September, humidity is 80%. With an average temperature of 17°C (62°F), this humidity feels like a heavy blanket wrapping around you, making travel sticky and uncomfortable, and often leaving you longing for a refreshing breeze.

September Average Humidity in South Bristol

This chart illustrates the average monthly humidity levels in South Bristol, 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 South Bristol 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 South Bristol

In South Bristol 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 South Bristol.

Maximum UV Index Levels in South Bristol for September

The chart shows the monthly maximum UV Index (UVI) for South Bristol 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 South Bristol typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: South Bristol 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 South Bristol Compares to Other Months

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

This table compares monthly weather conditions in South Bristol, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)98 mm (3.9 inches)85%low
February Weather0°C (32°F)101 mm (4.0 inches)86%moderate
March Weather1°C (35°F)86 mm (3.4 inches)84%moderate
April Weather6°C (43°F)138 mm (5.4 inches)79%high
May Weather10°C (50°F)84 mm (3.3 inches)79%very high
June Weather15°C (59°F)74 mm (2.9 inches)86%very high
July Weather18°C (65°F)101 mm (4.0 inches)85%very high
August Weather19°C (67°F)74 mm (2.9 inches)83%very high
September Weather17°C (62°F)89 mm (3.5 inches)80%high
October Weather12°C (55°F)143 mm (5.6 inches)77%moderate
November Weather6°C (44°F)123 mm (4.8 inches)80%moderate
December Weather1°C (35°F)138 mm (5.4 inches)81%low

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