Last updated: August 23, 2025
In September, the average temperature in Kouvola, Finland hovers around 11°C (53°F). Expect a chill in the air, with minimums dipping to -1°C (30°F), while daytime highs can reach up to 23°C (74°F). Be prepared for some rain; the region sees about 61 mm (2.4 in) of precipitation over approximately 12 days. With an average humidity of 90%, it's a great time to bundle up and enjoy the cozy vibes!
In September in Kouvola, the average temperature is 11°C (53°F), with maximums reaching up to 23°C (74°F) and minimums plummeting to as low as -1°C (30°F). Be prepared for a broad range of temperatures during your travels, making layered clothing a smart choice.
In Kouvola in September, the total precipitation amount is 61 mm (2.4 in), which occurs over a span of 12 days.
In Kouvola in September, humidity is 90%. With an average temperature of 11°C (53°F), this humidity feels like a heavy cloak, making traveling feel sticky and exhausting, as the dampness clings to your skin and the chill in the air sharpens the discomfort, leaving you longing for a breath of fresh, dry air.
In Kouvola 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 Kouvola, you can check the information here.
UV Risk Categories
Weather in Kouvola varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kouvola, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (26°F) | 52 mm (2.0 inches) | 98% | low |
| February Weather | -5°C (24°F) | 52 mm (2.1 inches) | 96% | low |
| March Weather | -2°C (29°F) | 46 mm (1.8 inches) | 93% | moderate |
| April Weather | 4°C (39°F) | 44 mm (1.7 inches) | 87% | moderate |
| May Weather | 10°C (51°F) | 50 mm (2.0 inches) | 75% | moderate |
| June Weather | 16°C (62°F) | 52 mm (2.0 inches) | 74% | high |
| July Weather | 18°C (64°F) | 77 mm (3.0 inches) | 80% | high |
| August Weather | 16°C (61°F) | 82 mm (3.2 inches) | 85% | moderate |
| September Weather | 11°C (53°F) | 61 mm (2.4 inches) | 90% | moderate |
| October Weather | 6°C (44°F) | 75 mm (2.9 inches) | 94% | low |
| November Weather | 2°C (36°F) | 56 mm (2.2 inches) | 94% | low |
| December Weather | -2°C (29°F) | 76 mm (3.0 inches) | 96% | low |