The highest day temperature in September 2026 was 90°F. The lowest night temperature was 64°F. The average values for day and night temperatures during September were 79.9°F и 74.0°F respectivly.

The average sea surface temperature in September 2026 for Montesilvano was 83.1°F. The maximum and minimum values were 77.2°F and 87.2°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Montesilvano is 0.7 in.

The average wind speed in September is 5.7 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 Montesilvano in September is 8.9 hours.