The highest day temperature in September 2025 was 105°F. The lowest night temperature was 70°F. The average values for day and night temperatures during September were 95.2°F и 77.6°F respectivly.

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

Precipitation total in September for Grapevine is 0.5 in. It makes september the least rainy month of the year.

The average wind speed in September is 7.8 mph. It makes September the most windless month of the year for Grapevine.

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 Grapevine in September is 9.6 hours.