Wejherowo weather in May

In May, Wejherowo sees average daytime highs of 16°C and overnight lows near 7°C, with 65 mm of rain across 11.5 wet days and about 15.8 hours of daylight. It is the 5th-warmest and 4th-wettest month of the year here.

Highs climb over the month, from about 14°C in the first days to 18°C by the end. The sky is clear or mostly clear about 31% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 h 48 min at the start of May to 16 h 30 min by month's end. Set against the rest of the year, May is Wejherowo's 1st-clearest and 10th-windiest month. For the whole year in context, see Wejherowo's year-round climate.

Daytime high
16°
5th warmest
Overnight low
8th coldest
Rainfall
65 mm
11.5 wet days
Daylight
15 h 48 min
3:49 AM – 7:37 PM
Cloud cover
58%
1st clearest
Wind
14 km/h
10th windiest
Solar energy
5.48 kWh/m²
Travel score
4.9
out of 10

Wejherowo is city and urban gmina of Poland.

Air quality
Good
PM10 29.1 µg/m³ · 2018
Density
1,825/km²
people per km²
Founded
1643

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 14°C in the first days to 18°C by the end.

A typical May day in Wejherowo reaches about 16°C in the afternoon and slips back to 7°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 22°C. Set against its neighbours, May runs about 5°C warmer than April and about 3°C cooler than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
1145
2145
3155
4155
5156
6156
7156
8156
9156
10156
11156
12156
13167
14167
15167
16167
17167
18167
19167
20167
21178
22178
23178
24178
25178
26178
27178
28188
29189
30189
31189

How May really feels in Wejherowo

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 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
0
wind chill below the day's low

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Wejherowo weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°4310.967.60.0
Feb / -3°369.65.99.30.0
Mar / -1°4410.94.611.50.4
Apr11° / 439.81.313.72.8
May16° / 6511.5015.84.9
Jun19° / 11°7713016.95.6
Jul21° / 13°9713.9016.46.0
Aug21° / 13°8313014.76.1
Sep17° / 10°5911012.55.2
Oct12° / 5311.20.310.22.9
Nov / 419.92.18.20.5
Dec / -1°4510.74.77.10.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in May, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of May, with mostly cloudy or overcast conditions the remaining 53%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24654
34654
44654
54654
64654
74654
84654
94654
104654
114555
124654
134753
144654
154753
164654
174753
184852
194753
204753
214852
224852
234852
244852
254852
264951
274951
284852
294852
304852
314852

Chance of precipitation in May

Any precipitation

Wejherowo gets around 65 mm of rain over 11.5 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
131
232
332
433
533
634
735
836
936
1037
1138
1239
1339
1440
1540
1640
1740
1840
1939
2039
2139
2239
2338
2438
2538
2637
2737
2837
2936
3036
3136

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 94% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
110000
29910
39910
49910
59910
69910
79910
89910
99820
109820
119820
129730
139730
149640
159640
169550
179550
189460
199271
209271
219181
229181
239091
2489101
2588102
2687112
2787112
2886122
2986122
3086122
3185132

Wind in May

Winds average 14 km/h in May.

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

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 h 48 min at the start of May to 16 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 102 minutes over May. Sunrise moves from 4:19 AM to 3:28 AM, and sunset from 7:10 PM to 8:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.84:197:10
214.94:177:12
315.04:157:13
415.04:127:15
515.14:107:17
615.24:087:19
715.24:067:21
815.34:047:23
915.44:027:25
1015.44:007:27
1115.53:587:28
1215.63:577:30
1315.63:557:32
1415.73:537:34
1515.73:517:36
1615.83:497:37
1715.93:487:39
1815.93:467:41
1916.03:447:42
2016.03:437:44
2116.13:417:46
2216.13:407:47
2316.23:387:49
2416.23:377:51
2516.33:357:52
2616.33:347:54
2716.43:337:55
2816.43:327:57
2916.53:307:58
3016.53:297:59
3116.53:288:01

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.48 kWh/m².

For context, solar energy here swings from a low near 0.43 kWh/m² to a high of 5.71 kWh/m² in June across the year — May's 5.48 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.4Bright
145.4Bright
155.4Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.6Bright
215.6Bright
225.6Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in May

Is May a good time to visit Wejherowo?

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

4.9
Sightseeing
5th-best month of the year
0.7
Beach & pool
5th-best month of the year

May is a reasonable time to visit Wejherowo for sightseeing.

What to pack for Wejherowo in May

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

In May, Wejherowo sees daytime highs around 16°C and nights near 7°C. Worth packing: a warm layer, rain gear and sun protection. About 12 days see rain.

a warm layerrain gearsun protection

Sea temperature near Wejherowo in May

The nearest coast averages about 9°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 25 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 Wejherowo in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Wejherowo peaks around June 20 at about 6 (high) — a little sun protection helps at midday. It bottoms out near January 1 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 20UV 6Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5Moderate
Jun6High
Jul5High
Aug5Moderate
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Wejherowo?

Wejherowo sits at 54.6°N, 18.2°E, 27 m above sea level, in Poland. The nearest listed city is Reda, 7.0 km away.

Topography around Wejherowo

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Wejherowo.

Within 3 km, the terrain around Wejherowo has only modest variations in elevation — a maximum elevation change of 129 m around an average of 66 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 242 m; within 80 km, significant variations in elevation — a maximum elevation change of 339 m.

The land around Wejherowo is covered by trees (67%) within 3 km, trees (57%) and grassland (21%) within 16 km, and water (41%), trees (27%) and cropland (20%) within 80 km.

3 km
129 m
16 km
242 m
80 km
339 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Reda 7.0 km · Rumia 11 km · Gdynia 21 km · Osowa 25 km · Sopot 28 km · Kartuzy 30 km · Przymorze Wielkie 32 km · Lębork 32 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 Wejherowo (54.6057°, 18.2356°, elevation 27 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).