Last updated: June 18, 2025
In September, the average temperature in Saint-Nazaire, Canada hovers around 13°C (56°F), with fluctuations that can bring a chilly minimum of -2°C (29°F) and a warm maximum of 29°C (85°F). Expect some precipitation, with an average of 125 mm (4.9 in) over 13 days, and a high average humidity of 85%.
In September in Saint-Nazaire, the average temperature is 13°C (56°F), with maximums reaching up to 29°C (85°F) and minimums dropping as low as -2°C (29°F). This range makes it a good month for travelers to experience mild weather, but they should be prepared for both warmth and cooler temperatures.
In Saint-Nazaire in September, the total precipitation amount is 125 mm (4.9 in), occurring over a span of 13 days.
In Saint-Nazaire in September humidity is 85%. With an average temperature of 13°C (56°F), this humidity feels like a damp chill that wraps around you, making outdoor activities feel heavier and less enjoyable, as layers of clothing cling to the skin and breath becomes visible in the moist air.
In Saint-Nazaire 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 Saint-Nazaire, you can refer to this Hourly UV Index in Saint-Nazaire.
UV Risk Categories
Weather in Saint-Nazaire varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Saint-Nazaire, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -13°C (9°F) | 66 mm (2.6 inches) | 96% | low |
| February Weather | -12°C (11°F) | 59 mm (2.3 inches) | 94% | moderate |
| March Weather | -6°C (22°F) | 81 mm (3.2 inches) | 91% | moderate |
| April Weather | 2°C (36°F) | 86 mm (3.4 inches) | 90% | high |
| May Weather | 10°C (51°F) | 95 mm (3.7 inches) | 80% | very high |
| June Weather | 16°C (61°F) | 83 mm (3.3 inches) | 73% | very high |
| July Weather | 20°C (68°F) | 122 mm (4.8 inches) | 81% | very high |
| August Weather | 18°C (65°F) | 116 mm (4.6 inches) | 84% | very high |
| September Weather | 13°C (56°F) | 125 mm (4.9 inches) | 85% | high |
| October Weather | 7°C (44°F) | 123 mm (4.8 inches) | 89% | moderate |
| November Weather | -1°C (30°F) | 99 mm (3.9 inches) | 91% | low |
| December Weather | -10°C (15°F) | 77 mm (3.0 inches) | 97% | low |