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September Weather in Bristol, United States

Last updated: June 24, 2025

In September, the average temperature in Bristol, United States hovers around 17°C (63°F), with a minimum dipping to 0°C (32°F) and a maximum peaking at 32°C (90°F). Expect about 68 mm (2.7 in) of precipitation spread over 8 days, contributing to an average humidity of 71%. Perfect for those who appreciate a refreshing climate!

September Temperature in Bristol

In September in Bristol, the average temperature is 17°C (63°F). The maximum can reach 32°C (90°F) and the minimum can be as low as 0°C (32°F). It's a great time to explore Bristol, so be prepared for both warm days and cool nights.

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

The chart illustrates September temperature patterns in Bristol, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bristol, September typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec222532445666717063513727
Data source: Temperature data for 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 Bristol

In Bristol in September, the precipitation amount is 68 mm (2.7 in) spread over 8 days.

September Precipitation Trends in Bristol

The chart displays monthly precipitation patterns in 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 Bristol, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec72837512882951359668131113116
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bristol

In Bristol in September, humidity is 71%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet a bit sticky, so travelers should stay hydrated and take breaks in the shade.

September Average Humidity in Bristol

This chart illustrates the average monthly humidity levels in 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 Bristol is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bristol

In 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 Bristol.

Maximum UV Index Levels in Bristol for September

The chart shows the monthly maximum UV Index (UVI) for 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 Bristol typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3458910997532
Data source: 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 Bristol Compares to Other Months

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

This table compares monthly weather conditions in Bristol, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (22°F)72 mm (2.8 inches)86%moderate
February Weather-4°C (25°F)83 mm (3.3 inches)84%moderate
March Weather0°C (32°F)75 mm (2.9 inches)82%moderate
April Weather7°C (44°F)128 mm (5.1 inches)80%very high
May Weather13°C (56°F)82 mm (3.2 inches)72%very high
June Weather19°C (66°F)95 mm (3.7 inches)72%very high
July Weather22°C (72°F)135 mm (5.3 inches)67%very high
August Weather21°C (70°F)96 mm (3.8 inches)66%very high
September Weather17°C (63°F)68 mm (2.7 inches)71%high
October Weather11°C (51°F)131 mm (5.1 inches)78%moderate
November Weather3°C (37°F)113 mm (4.4 inches)84%moderate
December Weather-3°C (27°F)116 mm (4.6 inches)81%low

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