Last updated: June 18, 2025
In September, the average temperature in Houston, Canada hovers around 8°C (48°F), with a minimum of -4°C (24°F) and a maximum reaching 24°C (75°F). Expect 93 mm (3.7 in) of precipitation spread over about 14 days, resulting in an average humidity of 91%. Ideal time for cozy layers and warm drinks!
In September in Houston, the average temperature is 8°C (48°F). Maximums can reach 24°C (75°F), while minimums can drop to as low as -4°C (24°F). Pack layers to ensure you stay comfortable during your travels, as temperatures can vary significantly throughout the day.
In Houston, in September, the precipitation amount is 93 mm (3.7 in) over the course of 14 days.
In Houston in September, humidity is 91%. With an average temperature of 8°C (48°F), this humidity feels like a chilly embrace that can make outdoor exploration less appealing, as the damp air seeps into your clothes and lingers on your skin, leaving travelers feeling cooler than the temperature suggests.
In Houston in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Houston, you can refer to this Hourly UV Index in Houston.
UV Risk Categories
Weather in Houston varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Houston, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 78 mm (3.1 inches) | 96% | low |
| February Weather | -9°C (16°F) | 57 mm (2.2 inches) | 94% | low |
| March Weather | -3°C (27°F) | 57 mm (2.3 inches) | 93% | moderate |
| April Weather | 1°C (34°F) | 40 mm (1.6 inches) | 91% | moderate |
| May Weather | 8°C (46°F) | 64 mm (2.5 inches) | 88% | high |
| June Weather | 11°C (52°F) | 68 mm (2.7 inches) | 84% | high |
| July Weather | 13°C (56°F) | 72 mm (2.8 inches) | 87% | very high |
| August Weather | 13°C (56°F) | 52 mm (2.1 inches) | 88% | high |
| September Weather | 8°C (48°F) | 93 mm (3.7 inches) | 91% | high |
| October Weather | 2°C (36°F) | 101 mm (4.0 inches) | 95% | moderate |
| November Weather | -2°C (29°F) | 117 mm (4.6 inches) | 98% | low |
| December Weather | -8°C (18°F) | 67 mm (2.6 inches) | 98% | low |