Last updated: August 23, 2025
In September, the average temperature in Kauniainen, Finland hovers around 12°C (54°F). Expect minimums that can dip to -1°C (31°F) and maximums reaching up to 23°C (73°F). With an average precipitation of 71 mm (2.8 in) spread over about 13 days, it's a month where you might want to keep your umbrella handy. Moreover, the average humidity level is quite high at 90%, adding to the overall chill in the air.
In September in Kauniainen, the average temperature is 12°C (54°F). The maximum can reach 23°C (73°F) and the minimum can be as low as -1°C (31°F). It's a great time to explore the area's outdoor activities and pack accordingly for varying weather conditions.
In Kauniainen in September, the total precipitation amount is 71 mm (2.8 in) occurring over the course of 13 days.
In Kauniainen in September, humidity is 90%. With an average temperature of 12°C (54°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and traveling a bit more draining than usual.
In Kauniainen in September, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Kauniainen for better planning.
UV Risk Categories
Weather in Kauniainen varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kauniainen, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (28°F) | 56 mm (2.2 inches) | 97% | low |
| February Weather | -3°C (26°F) | 48 mm (1.9 inches) | 95% | low |
| March Weather | -1°C (31°F) | 53 mm (2.1 inches) | 93% | moderate |
| April Weather | 4°C (39°F) | 45 mm (1.8 inches) | 86% | moderate |
| May Weather | 10°C (50°F) | 54 mm (2.1 inches) | 75% | moderate |
| June Weather | 16°C (61°F) | 55 mm (2.2 inches) | 75% | high |
| July Weather | 18°C (64°F) | 84 mm (3.3 inches) | 80% | high |
| August Weather | 16°C (62°F) | 77 mm (3.0 inches) | 83% | moderate |
| September Weather | 12°C (54°F) | 71 mm (2.8 inches) | 90% | moderate |
| October Weather | 7°C (45°F) | 88 mm (3.5 inches) | 93% | low |
| November Weather | 3°C (38°F) | 63 mm (2.5 inches) | 94% | low |
| December Weather | -1°C (31°F) | 74 mm (2.9 inches) | 95% | low |