Last updated: August 23, 2025
In Karvia, Finland, the average temperature in September hovers around 10°C (50°F), with nighttime lows dipping to a chilly -3°C (27°F) and daytime highs reaching a comfortable 23°C (74°F). Expect 69 mm (2.7 in) of precipitation spread over 13 days, contributing to an average humidity level of 89%. Whether you're planning a visit or simply curious about the climate, these figures paint a vivid picture of the typical weather during this month.
In September in Karvia, the average temperature is 10°C (50°F). Maximums can reach 23°C (74°F), while minimums can be as low as -3°C (27°F). Be prepared for a mix of mild days and chilly nights if you're planning to travel during this time.
In Karvia in September, the precipitation amount is 69 mm (2.7 in) over the course of 13 days.
In Karvia in September, humidity is 89%. With an average temperature of 10°C (50°F), this humidity feels like a dense blanket wrapping around you, making travel feel damp and chilly, and urging you to dress in layers for comfort.
In Karvia 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 Karvia, you can check the information here.
UV Risk Categories
Weather in Karvia varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Karvia, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (24°F) | 42 mm (1.6 inches) | 97% | low |
| February Weather | -5°C (22°F) | 43 mm (1.7 inches) | 95% | low |
| March Weather | -2°C (29°F) | 46 mm (1.8 inches) | 92% | moderate |
| April Weather | 3°C (37°F) | 45 mm (1.8 inches) | 85% | moderate |
| May Weather | 9°C (48°F) | 54 mm (2.1 inches) | 77% | moderate |
| June Weather | 15°C (60°F) | 61 mm (2.4 inches) | 74% | high |
| July Weather | 17°C (62°F) | 62 mm (2.4 inches) | 79% | high |
| August Weather | 15°C (59°F) | 93 mm (3.7 inches) | 82% | moderate |
| September Weather | 10°C (50°F) | 69 mm (2.7 inches) | 89% | moderate |
| October Weather | 5°C (41°F) | 70 mm (2.7 inches) | 93% | low |
| November Weather | 1°C (34°F) | 64 mm (2.5 inches) | 93% | low |
| December Weather | -3°C (27°F) | 58 mm (2.3 inches) | 95% | low |