Słupsk in Summer
In summer (June, July and August), Słupsk sees average daytime highs around 20°C and overnight lows near 14°C, with 245 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.
Over the season highs climb from about 17°C in early June to 19°C by late August. The sky is clear or mostly clear about 29% of the time across summer, and the air most often feels dry.
Summer is Słupsk's best season of the year to visit on our travel score. For the whole year in context, see Słupsk's year-round climate.
- Avg daytime high
- 20°C
- warmest season of the year
- Avg overnight low
- 14°C
- Rainfall
- 245 mm
- 39 wet days
- Avg wind
- 16 km/h
- Travel score
- 5.8
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Słupsk in Summer
Over the season highs climb from about 17°C in early June to 19°C by late August.
A typical summer day in Słupsk reaches about 20°C and drops to 14°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Słupsk
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.
Słupsk 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° | 59 | 12.2 | 4.7 | 7.6 | 0.0 |
| Feb | 3° / -1° | 47 | 10.9 | 5.1 | 9.3 | 0.0 |
| Mar | 5° / 1° | 51 | 10.5 | 3.6 | 11.5 | 0.3 |
| Apr | 10° / 4° | 36 | 8.8 | 0.8 | 13.7 | 2.3 |
| May | 14° / 8° | 56 | 10.5 | 0 | 15.7 | 4.3 |
| Jun | 18° / 12° | 68 | 11.5 | 0 | 16.9 | 5.6 |
| Jul | 20° / 15° | 91 | 13.4 | 0 | 16.4 | 6.0 |
| Aug | 21° / 15° | 85 | 13.7 | 0 | 14.7 | 5.9 |
| Sep | 17° / 12° | 78 | 12.3 | 0 | 12.5 | 5.0 |
| Oct | 12° / 8° | 80 | 13.6 | 0.1 | 10.2 | 2.8 |
| Nov | 7° / 4° | 65 | 13.2 | 1.4 | 8.2 | 0.7 |
| Dec | 4° / 0° | 66 | 13.5 | 4.5 | 7.1 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 29% of the time across summer.
Chance of precipitation in Summer
Słupsk gets around 245 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 16 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 16 h 36 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 5.1 kWh/m².
Is summer a good time to visit Słupsk?
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 Słupsk for sightseeing.
What to pack for Słupsk in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Słupsk sees daytime highs around 20°C and nights near 14°C. Worth packing: rain gear and sun protection. About 39 days see rain.
Sea temperature near Słupsk in Summer
The nearest coast averages about 16°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 Słupsk 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 Słupsk peaks around June 18 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 | 6 | 5 | 4 | 2 | 1 | 0 |
| Level | Low | Low | Moderate | Moderate | Moderate | High | High | Moderate | Moderate | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 4 | Moderate |
| May | 5 | Moderate |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 5 | Moderate |
| Sep | 4 | Moderate |
| Oct | 2 | Low |
| Nov | 1 | Low |
| Dec | 0 | Low |
Where is Słupsk?
Słupsk sits at 54.5°N, 17.0°E, 18 m above sea level, in Poland. The nearest listed city is Ustka, 17 km away.
Topography around Słupsk
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Słupsk.
Within 3 km, the terrain around Słupsk has only modest variations in elevation — a maximum elevation change of 78 m around an average of 42 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 162 m; within 80 km, significant variations in elevation — a maximum elevation change of 339 m.
The land around Słupsk is covered by trees (45%) and artificial surfaces (33%) within 3 km, trees (40%) and cropland (39%) within 16 km, and trees (39%) and water (30%) 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 Słupsk (54.4641°, 17.0287°, elevation 18 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.