The highest day temperature in September 2026 was 92°F. The lowest night temperature was 51°F. The average values for day and night temperatures during September were 73.0°F и 60.2°F respectivly.

The average sea surface temperature in September 2026 for Bristol was 72.2°F. The maximum and minimum values were 64.8°F and 77.4°F respectively.

You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in September for Bristol is 1.3 in. This value is relatively stable throughout the year.

The average wind speed in September is 7.1 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Bristol in September is 6.7 hours.