The highest day temperature in September 2025 was 87°F. The lowest night temperature was 49°F. The average values for day and night temperatures during September were 72.1°F и 65.4°F respectivly.

The average sea surface temperature in September 2025 for Lagan was 64.5°F. The maximum and minimum values were 58.8°F and 69.6°F respectively.

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

Precipitation total in September for Lagan is 1.0 in. It makes september the most rainy month of the year.

The average wind speed in September is 13.0 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 Lagan in September is 9.7 hours.