Last updated: June 24, 2025
In Vandalia, United States, the average temperature in September hovers around 22°C (72°F), offering a pleasant climate for exploration. Daily highs can peak at 34°C (93°F) while temperatures can dip to a cool 6°C (43°F). Visitors should expect 62 mm (2.4 in) of precipitation over 6 days, contributing to an average humidity of 79%. Perfect weather to experience the beauty of this destination!
In September in Vandalia, the average temperature is 22°C (72°F). Maximum temperatures can reach 34°C (93°F), while minimum temperatures can drop to as low as 6°C (43°F). This variety makes Vandalia an ideal destination for travelers seeking both warm days and cooler evenings.
In Vandalia in September, the precipitation amount is 62 mm (2.4 in), spread over the course of 6 days.
In Vandalia in September humidity is 79%. With an average temperature of 22°C (72°F), this humidity feels like you are enveloped in a warm, heavy blanket, making it feel considerably hotter and adding a layer of stickiness to your skin as you navigate through the streets.
In Vandalia in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Vandalia.
UV Risk Categories
Weather in Vandalia varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Vandalia, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 80 mm (3.1 inches) | 84% | moderate |
| February Weather | 2°C (35°F) | 82 mm (3.2 inches) | 82% | moderate |
| March Weather | 8°C (46°F) | 134 mm (5.3 inches) | 84% | high |
| April Weather | 12°C (55°F) | 130 mm (5.1 inches) | 83% | very high |
| May Weather | 19°C (67°F) | 153 mm (6.0 inches) | 80% | extreme |
| June Weather | 25°C (77°F) | 105 mm (4.1 inches) | 83% | extreme |
| July Weather | 26°C (79°F) | 94 mm (3.7 inches) | 82% | very high |
| August Weather | 24°C (76°F) | 105 mm (4.1 inches) | 82% | very high |
| September Weather | 22°C (72°F) | 62 mm (2.4 inches) | 79% | very high |
| October Weather | 15°C (59°F) | 114 mm (4.5 inches) | 79% | high |
| November Weather | 6°C (43°F) | 83 mm (3.3 inches) | 88% | moderate |
| December Weather | 3°C (38°F) | 71 mm (2.8 inches) | 87% | moderate |