Last updated: August 23, 2025
In April, the average temperature in Kotka, Finland hovers around 4°C (39°F), with extremes ranging from a chilly -12°C (11°F) to a mild 19°C (66°F). Rainfall is expected, with 43 mm (1.7 in) spread over 10 days, contributing to a high average humidity of 87%. Whether you’re bundling up or enjoying a brief warm spell, be prepared for a mix of damp and cool weather!
In April in Kotka, the average temperature is 4°C (39°F). Maximum temperatures can reach 19°C (66°F), while minimums can drop as low as -12°C (11°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.
In Kotka in April, the precipitation amount is 43 mm (1.7 in) over a span of 10 days.
In Kotka in April, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.
In Kotka in April, 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 Kotka for better planning.
UV Risk Categories
Weather in Kotka varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Kotka, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 55 mm (2.2 inches) | 98% | low |
| February Weather | -4°C (25°F) | 55 mm (2.2 inches) | 96% | low |
| March Weather | -1°C (30°F) | 49 mm (1.9 inches) | 93% | moderate |
| April Weather | 4°C (39°F) | 43 mm (1.7 inches) | 87% | moderate |
| May Weather | 10°C (50°F) | 48 mm (1.9 inches) | 75% | moderate |
| June Weather | 16°C (61°F) | 48 mm (1.9 inches) | 74% | high |
| July Weather | 18°C (64°F) | 75 mm (3.0 inches) | 80% | high |
| August Weather | 17°C (62°F) | 88 mm (3.5 inches) | 85% | moderate |
| September Weather | 12°C (54°F) | 66 mm (2.6 inches) | 90% | moderate |
| October Weather | 7°C (45°F) | 86 mm (3.4 inches) | 94% | low |
| November Weather | 3°C (38°F) | 66 mm (2.6 inches) | 94% | low |
| December Weather | -1°C (30°F) | 81 mm (3.2 inches) | 96% | low |