The highest day temperature in September 2026 was 105°F. The lowest night temperature was 80°F. The average values for day and night temperatures during September were 95.1°F и 83.4°F respectivly.

The average sea surface temperature in September 2026 for Houston was 91.0°F. The maximum and minimum values were 88.4°F and 92.6°F respectively.

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

Precipitation total in September for Houston is 4.5 in. It makes september the most rainy month of the year.

The average wind speed in September is 6.9 mph. It makes September the most windless month of the year for Houston.

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 Houston in September is 7.4 hours.