Koszalin climate
Koszalin (Poland) has a warm-summer humid continental climate (Köppen Dfb). The average temperature over the year is 9 °C48 °F, and about 749 mm30 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Koszalin climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 133 | −425 | −129 | 632.5 | 23 |
| Feb | 236 | −326 | 031 | 461.8 | 22 |
| Mar | 643 | −130 | 337 | 491.9 | 18 |
| Apr | 1254 | 337 | 846 | 361.4 | 6 |
| May | 1864 | 846 | 1355 | 592.3 | 0 |
| Jun | 2170 | 1253 | 1662 | 692.7 | 0 |
| Jul | 2374 | 1458 | 1966 | 983.9 | 0 |
| Aug | 2374 | 1458 | 1966 | 813.2 | 0 |
| Sep | 1966 | 1051 | 1558 | 622.4 | 0 |
| Oct | 1355 | 642 | 948 | 622.4 | 2 |
| Nov | 744 | 236 | 540 | 612.4 | 8 |
| Dec | 337 | −130 | 133 | 652.6 | 19 |
| Year | 2374 | −425 | 948 | 74930 | 97 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 94% | 87% | 0.5 | 7:53 |
| Feb | 92% | 84% | 1.1 | 9:40 |
| Mar | 87% | 76% | 2.4 | 11:40 |
| Apr | 79% | 63% | 4.2 | 13:58 |
| May | 76% | 61% | 5.3 | 15:59 |
| Jun | 74% | 62% | 5.8 | 17:09 |
| Jul | 75% | 64% | 5.3 | 16:40 |
| Aug | 74% | 65% | 4.4 | 14:52 |
| Sep | 78% | 64% | 3.1 | 12:36 |
| Oct | 85% | 72% | 1.6 | 10:23 |
| Nov | 92% | 81% | 0.6 | 8:24 |
| Dec | 94% | 86% | 0.4 | 7:22 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Koszalin is like
The warmest month is July, with an average high of 23 °C74 °F and a low of 14 °C58 °F. The coldest is January, when highs average 1 °C33 °F and lows −4 °C25 °F. Seasons are strongly marked: the warmest month is on average 20.3 °C36.6 °F warmer than the coldest.
Annual precipitation is moderate at about 749 mm30 in. The wettest three-month stretch is June–August, which brings 33% of the annual total. The wettest month is July (98 mm3.9 in), the driest is April (36 mm1.4 in).
Relative humidity ranges from 74% in August to 94% in December. The clearest skies (lowest average cloud amount, 61%) are typical of May. Average wind speed near the ground ranges from 10 km/h (6 mph) in August to 15 km/h (9 mph) in January. Daylight lasts from about 7.4 hours in December to 17.1 hours in June.
A lasting snow cover is typical in December–February, when the average snow depth in the reanalysis exceeds 10 cm (deepest in January, about 15 cm).
Best time to visit Koszalin
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–September: average highs of 19 °C66 °F to 23 °C74 °F with 62 mm2.4 in to 98 mm3.9 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 1 °C33 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Koszalin
- Winter (December–February) — highs 133 to 3 °C37 °F, lows −425 to −1 °C30 °F, about 58 mm2.3 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 643 to 18 °C64 °F, lows −130 to 8 °C46 °F, about 48 mm1.9 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Summer (June–August) — highs 2170 to 23 °C74 °F, lows 1253 to 14 °C58 °F, about 83 mm3.2 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Autumn (September–November) — highs 744 to 19 °C66 °F, lows 236 to 10 °C51 °F, about 62 mm2.4 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
How Koszalin compares
Compared with Szczecin, about 136 km to the southwest, Koszalin is on average 0.4 °C0.6 °F warmer and receives 16% more precipitation (749 mm30 in vs 644 mm25 in). The difference is largest in November (0.7 °C1.3 °F warmer).
Of the 36 places in Poland covered by World Climates, Koszalin is the 18th warmest by annual mean temperature and the 5th wettest by annual precipitation. See all of them on the Poland climate page.
Places in other countries with the most similar temperature and rainfall pattern: Chemnitz (Germany, Dfb), Liberec (Czechia, Dfb) and Augsburg (Germany, Dfb).
Nearby places
- Szczecin 136 km · 8 °C47 °F · 644 mm25 in
- Gdańsk 162 km · 9 °C48 °F · 713 mm28 in
- Bydgoszcz 170 km · 9 °C48 °F · 618 mm24 in
- Gorzów Wielkopolski 174 km · 10 °C49 °F · 609 mm24 in
- Poznań 205 km · 9 °C49 °F · 598 mm24 in
- Toruń 207 km · 9 °C48 °F · 623 mm25 in
- Elbląg 211 km · 8 °C47 °F · 691 mm27 in
- Zielona Góra 255 km · 9 °C49 °F · 597 mm23 in
Frequently asked questions
What is the warmest month in Koszalin?
July is the warmest month in Koszalin, with an average high of 23 °C (74 °F) and an average low of 14 °C (58 °F).
What is the coldest month in Koszalin?
January is the coldest month, with an average high of 1 °C (33 °F) and an average low of -4 °C (25 °F).
When does it rain the most in Koszalin?
July is the wettest month with about 98 mm (3.9 in) of precipitation; April is the driest with about 36 mm (1.4 in).
What is the best time to visit Koszalin?
Judging by long-term averages, the most comfortable months are June–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 81 m, while Koszalin lies at about 30 m. Temperatures on this page were therefore adjusted by +0.3 °C0.6 °F using the standard lapse rate of 6.5 °C per 1,000 m.