Weather in Mustang Island: September
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Average day temperature: | 86.8°F |
| Average night temperature: | 81.0°F | |
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Sea water temperature: | 85.5°F |
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Number of sunny days: | 13 days |
| Day length: | 11.9 - 12.7 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 0.9 in. | |
| more information | ||
forecast
| Mustang Island |
temperature
| Mustang Island |
Air temperature in September, °F
The highest day temperature during September of 2026 was 89°F. At the same time the lowest night temperature was 83°F. Daily and nightly averages during September were 85.8°F and 84.6°F.
Sea water temperature in Mustang Island in September, °F
The average sea water temperature in September of 2026 was 86.4°F. The highest and lowest sea temperatures during the month were 87.3°F and 85.6°F.
Mostly all days in September are sunny but cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in Mustang Island in September is 0.9 in. Other months of the year show relatively similar values.
The average wind speed value in September is 11.0 mph It makes September lest windy month of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 7.9.
Best time for vacation in Mustang Island
Mustang Island on a weather map
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