Mustang Island Weather: September
 |
Average Day Temperature: | 91.1°F |
|
Average Night Temperature: | 83.7°F |
|
Sea Water Temperature: | 89.3°F |
|
Number of Sunny Days: | 14 days |
| Sunshine Hours: | 11.9 - 12.7 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 1.0 in | |
| detailed information | ||
forecast
| Mustang Island |
Temperature
| Mustang Island |
Air Temperature in September, °F
The highest day temperature in September 2025 was 99°F. The lowest night temperature was 73°F. The average values for day and night temperatures during September were 93.6°F и 83.8°F respectivly.
Mustang Island Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Mustang Island was 90.0°F. The maximum and minimum values were 88.0°F and 92.2°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Mustang Island is 1.0 in. It makes september one of the most rainy months of the year.
The average wind speed in September is 10.7 mph. It makes September the most windless month of the year for Mustang Island.
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 Mustang Island in September is 7.9 hours.
Mustang Island on the Weather Map
| Chicago |  |
-2 |
| Hawaii | |
+78 |
| Honolulu | |
+78 |
| Houston | |
+44 |
| Las Vegas |  |
+40 |
| Los Angeles | |
+52 |
| Maui | |
+72 |
| Miami | |
+72 |
| Miami Beach |  |
+80 |
| New York | |
+18 |
| San Diego | |
+54 |
| San Francisco | |
+46 |
| Sarasota | |
+62 |
| Tampa | |
+62 |
| Washington | |
+28 |
| 0300 |  |
48°F | S 14 mph |
| 0600 | |
48°F | S 13 mph |
| 0900 | |
48°F | S 11 mph |
| 1200 |  |
54°F | S 7 mph |
| 1500 | |
60°F | SW 5 mph |
| 1800 | |
60°F | SW 6 mph |
| 2100 | |
56°F | SW 7 mph |
| 0000 | |
58°F | SW 6 mph |