Last updated: August 23, 2025
In September, the average temperature in Saint-Jean, France hovers around 10°C (51°F), with a range that can dip to a chilly -9°C (15°F) and peak at a balmy 22°C (71°F). Expect about 64 mm (2.5 in) of precipitation spread across 11 days, contributing to an average humidity of 73%. Be prepared for a mix of crisp air and occasional rain as you explore this vibrant locale!
In September in Saint-Jean, the average temperature is 10°C (51°F). Maximum temperatures can reach 22°C (71°F), while minimums can drop as low as -9°C (15°F). Be prepared for a range of weather conditions to fully enjoy your travels.
In Saint-Jean in September, the total precipitation amount is 64 mm (2.5 in) spread over 11 days.
In Saint-Jean in September, humidity is 73%. With an average temperature of 10°C (51°F), this humidity feels like a chilly dampness that can make outdoor activities uncomfortable, causing your clothes to cling to your skin and a persistent coolness that seeps into your bones, which might deter long excursions without proper layering.
In Saint-Jean 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 Saint-Jean.
UV Risk Categories
Weather in Saint-Jean varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Saint-Jean, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 81 mm (3.2 inches) | 91% | moderate |
| February Weather | -3°C (27°F) | 73 mm (2.9 inches) | 87% | moderate |
| March Weather | -1°C (30°F) | 115 mm (4.5 inches) | 84% | very high |
| April Weather | 2°C (36°F) | 83 mm (3.3 inches) | 83% | very high |
| May Weather | 7°C (44°F) | 143 mm (5.6 inches) | 78% | very high |
| June Weather | 12°C (54°F) | 99 mm (3.9 inches) | 75% | extreme |
| July Weather | 14°C (58°F) | 69 mm (2.7 inches) | 72% | very high |
| August Weather | 14°C (58°F) | 72 mm (2.8 inches) | 63% | very high |
| September Weather | 10°C (51°F) | 64 mm (2.5 inches) | 73% | very high |
| October Weather | 6°C (43°F) | 106 mm (4.2 inches) | 89% | high |
| November Weather | -1°C (31°F) | 106 mm (4.2 inches) | 90% | moderate |
| December Weather | -5°C (24°F) | 184 mm (7.3 inches) | 90% | low |