Koszalin in Summer
In summer (June, July and August), Koszalin sees average daytime highs around 21°C and overnight lows near 13°C, with 239 mm of rain over about 39 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 21°C. The sky is clear or mostly clear about 27% of the time across summer, and the air most often feels dry.
Summer is Koszalin's best season of the year to visit on our travel score. For the whole year in context, see Koszalin's year-round climate.
- Avg daytime high
- 21°C
- warmest season of the year
- Avg overnight low
- 13°C
- Rainfall
- 239 mm
- 39 wet days
- Avg wind
- 14 km/h
- Travel score
- 6.0
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Koszalin in Summer
Across summer, daytime highs hold fairly steady around 21°C.
A typical summer day in Koszalin reaches about 21°C and drops to 13°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Koszalin
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Koszalin weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 2° / -1° | 54 | 11.7 | 4.5 | 7.7 | 0.0 |
| Feb | 3° / -1° | 44 | 10.2 | 4.5 | 9.3 | 0.0 |
| Mar | 6° / 0° | 49 | 10.3 | 3 | 11.5 | 0.6 |
| Apr | 11° / 4° | 38 | 9 | 0.5 | 13.7 | 3.0 |
| May | 16° / 8° | 56 | 10.8 | 0.1 | 15.7 | 5.0 |
| Jun | 19° / 12° | 71 | 12 | 0 | 16.8 | 5.8 |
| Jul | 21° / 14° | 90 | 13.3 | 0 | 16.4 | 6.1 |
| Aug | 22° / 14° | 78 | 13.4 | 0 | 14.6 | 6.1 |
| Sep | 18° / 11° | 68 | 12.2 | 0 | 12.5 | 5.2 |
| Oct | 12° / 7° | 66 | 12.5 | 0.1 | 10.2 | 3.1 |
| Nov | 7° / 3° | 53 | 11.8 | 1.3 | 8.2 | 0.8 |
| Dec | 4° / 0° | 58 | 12.4 | 4 | 7.2 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 27% of the time across summer.
Chance of precipitation in Summer
Koszalin gets around 239 mm of rain over 39 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 14 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 16 h 30 min in early June to 13 h 36 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.2 kWh/m².
Is summer a good time to visit Koszalin?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Koszalin for sightseeing.
What to pack for Koszalin in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Koszalin sees daytime highs around 21°C and nights near 13°C. Worth packing: rain gear and sun protection. About 39 days see rain.
Sea temperature near Koszalin in Summer
The nearest coast averages about 17°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 20 km away) is warmest in August at about 19°C and coldest in February near 3°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 4 | 3 | 3 | 5 | 9 | 14 | 17 | 19 | 16 | 13 | 9 | 6 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 4 | Bracing |
| Feb | 3 | Bracing |
| Mar | 3 | Bracing |
| Apr | 5 | Bracing |
| May | 9 | Bracing |
| Jun | 14 | Bracing |
| Jul | 17 | Cool |
| Aug | 19 | Cool |
| Sep | 16 | Cool |
| Oct | 13 | Bracing |
| Nov | 9 | Bracing |
| Dec | 6 | Bracing |
UV index in Koszalin in Summer
Clear-sky midday UV across summer averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Koszalin peaks around June 17 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 20 at about 0 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 4 | 5 | 6 | 5 | 5 | 4 | 2 | 1 | 0 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 4 | Moderate |
| May | 5 | High |
| Jun | 6 | High |
| Jul | 5 | High |
| Aug | 5 | High |
| Sep | 4 | Moderate |
| Oct | 2 | Low |
| Nov | 1 | Low |
| Dec | 0 | Low |
Air quality in Koszalin in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Koszalin is worst in April — around 18 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 8 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Koszalin's WHO annual average of 13.7 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 13 | 17 | 18 | 16 | 16 | 16 | 15 | 14 | 11 | 9 | 8 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 13 | Moderate |
| Mar | 17 | Moderate |
| Apr | 18 | Moderate |
| May | 16 | Moderate |
| Jun | 16 | Moderate |
| Jul | 16 | Moderate |
| Aug | 15 | Moderate |
| Sep | 14 | Moderate |
| Oct | 11 | Good |
| Nov | 9 | Good |
| Dec | 8 | Good |
Where is Koszalin?
Koszalin sits at 54.2°N, 16.2°E, 30 m above sea level, in Poland. The nearest listed city is Białogard, 24 km away.
Topography around Koszalin
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Koszalin.
Within 3 km, the terrain around Koszalin has only modest variations in elevation — a maximum elevation change of 106 m around an average of 39 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 153 m; within 80 km, significant variations in elevation — a maximum elevation change of 264 m.
The land around Koszalin is covered by artificial surfaces (38%) and trees (35%) within 3 km, trees (38%), cropland (23%) and grassland (20%) within 16 km, and trees (38%), water (27%) and cropland (22%) within 80 km.
Poland travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / E
- 230 V · 50 Hz
- Prices
- ≈ 52% of US
- price level, 2025
- GDP per capita
- $28,420
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 89%
- of population, 2024
- Homicide rate
- 0.8
- per 100k, 2023
- Road deaths
- 9.4
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 600
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Koszalin (54.1944°, 16.1722°, elevation 30 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.