Last updated: March 2, 2024
The weather in Galveston, United States, during September is characterized by an average temperature of 27°C (81°F). Highs can soar to 31°C (87°F), while lows may dip to 23°C (73°F). Typically, the humidity level in Galveston throughout September hovers around 75%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Galveston averages 243 mm (9.6 inches) of rainfall, typically over the course of 16 rainy days. The month enjoys an average of 12 hours 17 minutes of daylight, with the sun shining for approximately 9 hours 9 minutes each day. Additionally, there is a 47% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Galveston reaches a maximum of 11, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 2 | 5 | 7 | 10 | 11 | 10 | 8 | 6 | 3 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | Extreme | VeryHigh | High | Moderate | Low | ||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 10 min | 15 min | 25 min | 30 min | 45 min | ||||