The highest day temperature in September 2026 was 74°F. The lowest night temperature was 38°F. The average values for day and night temperatures during September were 63.0°F и 45.6°F respectivly.

The average sea surface temperature in September 2026 for Stateline was 65.0°F. The maximum and minimum values were 62.4°F and 70.0°F respectively.

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

Precipitation total in September for Stateline is 0.1 in. It makes september one of the least rainy months of the year.

The average wind speed in September is 6.4 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 Stateline in September is 10.3 hours.