Last updated: June 24, 2025
In September, the average temperature in Bristol, United States is 19°C (66°F), with fluctuations ranging from a cool 3°C (38°F) to a warm 33°C (92°F). Expect about 122 mm (4.8 in) of precipitation over 9 days, coupled with an average humidity level of 68%. This blend of temperatures and moisture makes September a unique experience in Bristol!
In September in Bristol, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (92°F), while minimums can dip as low as 3°C (38°F). This variety in weather makes Bristol an ideal destination for travelers seeking both warm and cool experiences.
In Bristol in September, the precipitation amount is 122 mm (4.8 in) over a span of 9 days.
In Bristol in September humidity is 68%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, creating a sticky atmosphere that can be a bit uncomfortable for traveling.
In Bristol in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Bristol.
UV Risk Categories
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.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -2°C (29°F) | 73 mm (2.9 inches) | 84% | moderate |
February Weather | 0°C (32°F) | 93 mm (3.7 inches) | 82% | moderate |
March Weather | 3°C (38°F) | 91 mm (3.6 inches) | 81% | high |
April Weather | 9°C (48°F) | 136 mm (5.3 inches) | 78% | very high |
May Weather | 15°C (59°F) | 120 mm (4.7 inches) | 69% | very high |
June Weather | 20°C (69°F) | 103 mm (4.1 inches) | 69% | very high |
July Weather | 23°C (74°F) | 162 mm (6.4 inches) | 62% | very high |
August Weather | 22°C (73°F) | 107 mm (4.2 inches) | 65% | very high |
September Weather | 19°C (66°F) | 122 mm (4.8 inches) | 68% | very high |
October Weather | 13°C (56°F) | 152 mm (6.0 inches) | 74% | high |
November Weather | 5°C (42°F) | 95 mm (3.7 inches) | 82% | moderate |
December Weather | 1°C (33°F) | 123 mm (4.9 inches) | 80% | low |