September Weather in Bristol

Last updated: March 2, 2024

The weather in Bristol, United States, during September is characterized by an average temperature of 17°C (63°F). Highs can soar to 29°C (84°F), while lows may dip to 6°C (44°F). Typically, the humidity level in Bristol throughout September hovers around 80%.

6°C (44°F)

Minimum temperature

17°C (63°F)

Average temperature

29°C (84°F)

Maximum temperature

80%

Humidity

Precipitation and Sunshine hours

In September, Bristol averages 76 mm (3.0 inches) of rainfall, typically over the course of 7 rainy days. The month enjoys an average of 12 hours 27 minutes of daylight, with the sun shining for approximately 9 hours 32 minutes each day. Additionally, there is a 42% probability of sunny days during this period.

76 mm (3.0 inches)

Precipitation

7 rainy days

Rainy days

9 hours 32 minutes

Sunshine hours

42%

Chance of sun

UV Index

In September, the UV Index in Bristol reaches a maximum of 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 25 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 2 3 5 6 7 7 6 5 3 2 1 1
Exposure Low Moderate High Moderate Low
Time to burn 45 min 30 min 25 min 30 min 45 min

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