Kotka Temperature by Month
The average annual maximum temperature in Kotka, Southern Finland, Finland is 9°C (48°F), with daytime highs ranging from -2°C (28°F) in February to 22°C (72°F) in July. This page covers monthly averages, day-night differences, and how Kotka compares to cities worldwide.
Kotka Monthly Temperatures
With significant temperature fluctuations, Kotka enjoys distinct seasons year-round. Nighttime lows range from 15°C (59°F) in July to -8°C (18°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Kotka by month:
The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
50-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in July
Historical Kotka Temperatures: 1976-2026
Browse day-by-day temperature records for Kotka spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Kotka vs Finland
The map below shows the annual temperature across Finland. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Kotka vs World: Temperature Compared
Kotka's average annual maximum temperature is 9°C (48°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Kotka this rarely lasts long on the ground.
For more on Kotka's weather — including monthly rainfall, sunshine hours, and humidity — visit our Kotka climate page.
