Koszalin weather in April

In April, Koszalin sees average daytime highs of 11°C and overnight lows near 4°C, with 38 mm of precipitation across 9 wet days and about 13.7 hours of daylight. It is the 7th-warmest and 12th-wettest month of the year here.

Highs climb over the month, from about 9°C in the first days to 14°C by the end. The sky is clear or mostly clear about 31% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 42 min at the start of April to 14 h 42 min by month's end. Set against the rest of the year, April is Koszalin's 3rd-clearest and 8th-windiest month. For the whole year in context, see Koszalin's year-round climate.

Daytime high
11°
7th warmest
Overnight low
6th coldest
Precipitation
38 mm
9 wet days
Daylight
13 h 48 min
5:03 AM – 6:48 PM
Cloud cover
58%
3rd clearest
Wind
16 km/h
8th windiest
Solar energy
4.38 kWh/m²
Travel score
3.0
out of 10

Koszalin is city with powiat rights of Poland.

Air quality
Moderate
PM2.5 13.7 µg/m³ · 2019
Density
1,023/km²
people per km²
Founded
1266

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 9°C in the first days to 14°C by the end.

A typical April day in Koszalin reaches about 11°C in the afternoon and slips back to 4°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 17°C. Set against its neighbours, April runs about 5°C warmer than March and about 5°C cooler than May.

10°20°151015202530
Avg high (°C)Avg low (°C)
192
292
392
492
592
6103
7103
8103
9103
10103
11103
12103
13113
14113
15114
16114
17114
18124
19124
20124
21124
22135
23135
24135
25135
26145
27145
28146
29146
30146

How April really feels in Koszalin

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 16 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
16
wind chill below the day's low

The story in April is cold — wind chill drags the overnight "feels like" below the raw low.

Koszalin weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°5411.74.57.70.0
Feb / -1°4410.24.59.30.0
Mar / 4910.3311.50.6
Apr11° / 3890.513.73.0
May16° / 5610.80.115.75.0
Jun19° / 12°7112016.85.8
Jul21° / 14°9013.3016.46.1
Aug22° / 14°7813.4014.66.1
Sep18° / 11°6812.2012.55.2
Oct12° / 6612.50.110.23.1
Nov / 5311.81.38.20.8
Dec / 5812.447.20.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 16% of April, with mostly cloudy or overcast conditions the remaining 53%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34159
44159
54258
64258
74258
84258
94456
104456
114456
124555
134555
144852
154951
164951
174951
185050
195149
205149
215248
225248
235248
245248
255248
265248
275347
285248
295248
305149

Chance of precipitation in April

Any precipitationSnow

Koszalin gets around 38 mm of rain and snow over 9 wet days in April, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 30% and peaks near 33% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%151015202530
Rain chance (%)Snow chance (%)
1326
2325
3325
4325
5325
6334
7334
8324
9324
10323
11313
12313
13303
14302
15292
16292
17282
18281
19281
20281
21271
22271
23270
24270
25270
26280
27280
28280
29290
30300

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, April lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100

Wind in April

Winds average 16 km/h in April.

Across April, daily wind ranges from about 14 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3014light breeze

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 42 min at the start of April to 14 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 120 minutes over April. Sunrise moves from 5:40 AM to 4:31 AM, and sunset from 6:20 PM to 7:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:406:20
212.75:386:21
312.85:356:23
412.95:336:25
512.95:306:27
613.05:286:29
713.15:256:31
813.25:236:33
913.25:206:35
1013.35:186:37
1113.45:156:39
1213.55:136:40
1313.55:106:42
1413.65:086:44
1513.75:056:46
1613.85:036:48
1713.85:016:50
1813.94:586:52
1914.04:566:54
2014.04:536:56
2114.14:516:58
2214.24:497:00
2314.34:467:01
2414.34:447:03
2514.44:427:05
2614.54:397:07
2714.54:377:09
2814.64:357:11
2914.74:337:13
3014.74:317:15

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.38 kWh/m².

For context, solar energy here swings from a low near 0.44 kWh/m² to a high of 5.76 kWh/m² in June across the year — April's 4.38 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.6Moderate
33.6Moderate
43.7Moderate
53.8Moderate
63.8Moderate
73.9Moderate
83.9Moderate
94.0Moderate
104.0Bright
114.1Bright
124.2Bright
134.2Bright
144.3Bright
154.4Bright
164.4Bright
174.5Bright
184.6Bright
194.6Bright
204.7Bright
214.7Bright
224.8Bright
234.8Bright
244.9Bright
254.9Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.1Bright
Planning a trip in April

Is April a good time to visit Koszalin?

Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.0
Sightseeing
7th-best month of the year
0.0
Beach & pool
7th-best month of the year

April is a weaker month for outdoor sightseeing in Koszalin.

What to pack for Koszalin in April

From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In April, Koszalin sees daytime highs around 11°C and nights near 4°C. Pack a warm layer. Worth having: rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Koszalin in April

The nearest coast averages about 5°C in April — 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.

0°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar3Bracing
Apr5Bracing
May9Bracing
Jun14Bracing
Jul17Cool
Aug19Cool
Sep16Cool
Oct13Bracing
Nov9Bracing
Dec6Bracing

UV index in Koszalin in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 4 — 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 17UV 6Dec 20UV 0
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul5High
Aug5High
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low

Air quality in Koszalin in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April 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.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1318 µg/m³Dec 149 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar17Moderate
Apr18Moderate
May16Moderate
Jun16Moderate
Jul16Moderate
Aug15Moderate
Sep14Moderate
Oct11Good
Nov9Good
Dec8Good
Location & terrain

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.

KołobrzegŚwidwinUstkaSłupskSzczecinekGryficeBytów

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.

3 km
106 m
16 km
153 m
80 km
264 m
treesgrasslandcroplandartificial surfaceswaterwetland
April weather nearby: Białogard 24 km · Kołobrzeg 38 km · Świdwin 53 km · Ustka 62 km · Słupsk 63 km · Szczecinek 64 km · Gryfice 71 km · Bytów 86 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
Roman Catholic 71%refused to answer 21%no religion 7%

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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).