The highest day temperature in September 2026 was 86°F. The lowest night temperature was 59°F. The average values for day and night temperatures during September were 67.6°F и 63.7°F respectivly.

The average sea surface temperature in September 2026 for Provincetown was 66.3°F. The maximum and minimum values were 60.2°F and 72.6°F respectively.

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

Precipitation total in September for Provincetown is 1.2 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 11.3 mph. It makes September one of the most windless months of the year for Provincetown.

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 Provincetown in September is 6.8 hours.