Last updated: August 23, 2025
In September, the average temperature in Oulainen, Finland hovers around 9°C (49°F), creating a mild climate that's perfect for outdoor activities. Expect temperatures to range from a chilly -4°C (24°F) at night to a pleasant 24°C (75°F) during the day. However, be prepared for some rain, as the region sees an average precipitation of 76 mm (3.0 in) over 13 days. With an average humidity of 89%, it's advisable to dress in layers to enjoy everything this enchanting place has to offer!
In September in Oulainen, the average temperature is 9°C (49°F). Maximums can reach 24°C (75°F) and minimums can be as low as -4°C (24°F). This variation in climate makes it essential for travelers to pack both warm clothing for the cooler evenings and lighter layers for the warmer daytime temperatures.
In Oulainen in September, the total precipitation amount is 76 mm (3.0 in), which occurs over the course of 13 days.
In Oulainen in September, humidity is 89%. With an average temperature of 9°C (49°F), this humidity feels like a persistent dampness that clings to your clothes and skin, making it challenging to stay comfortable while traveling.
In Oulainen in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Oulainen, you can check the information here.
UV Risk Categories
Weather in Oulainen varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Oulainen, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 38 mm (1.5 inches) | 99% | low |
| February Weather | -7°C (19°F) | 39 mm (1.5 inches) | 97% | low |
| March Weather | -3°C (27°F) | 38 mm (1.5 inches) | 93% | low |
| April Weather | 2°C (35°F) | 40 mm (1.6 inches) | 86% | moderate |
| May Weather | 8°C (47°F) | 59 mm (2.3 inches) | 80% | moderate |
| June Weather | 15°C (59°F) | 57 mm (2.3 inches) | 76% | high |
| July Weather | 17°C (63°F) | 74 mm (2.9 inches) | 79% | high |
| August Weather | 14°C (58°F) | 93 mm (3.7 inches) | 83% | moderate |
| September Weather | 9°C (49°F) | 76 mm (3.0 inches) | 89% | moderate |
| October Weather | 4°C (40°F) | 83 mm (3.3 inches) | 94% | low |
| November Weather | 0°C (32°F) | 61 mm (2.4 inches) | 94% | low |
| December Weather | -4°C (25°F) | 50 mm (2.0 inches) | 98% | low |