Koersel weather in May

In May, Koersel sees average daytime highs of 18°C and overnight lows near 9°C, with 60 mm of rain across 12.1 wet days and about 15.3 hours of daylight. It is the 5th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 17°C in the first days to 20°C by the end. The sky is clear or mostly clear about 16% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 h 30 min at the start of May to 15 h 54 min by month's end. Set against the rest of the year, May is Koersel's 5th-clearest and 8th-windiest month. For the whole year in context, see Koersel's year-round climate.

Daytime high
18°
5th warmest
Overnight low
8th coldest
Rainfall
60 mm
12.1 wet days
Daylight
15 h 18 min
4:56 AM – 8:14 PM
Cloud cover
69%
5th clearest
Wind
12 km/h
8th windiest
Solar energy
5.01 kWh/m²
Travel score
5.5
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 17°C in the first days to 20°C by the end.

A typical May day in Koersel reaches about 18°C in the afternoon and slips back to 9°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 25°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1178
2178
3178
4178
5178
6178
7178
8178
9189
10189
11189
12189
13189
14189
15189
16189
17199
181910
191910
201910
211910
221910
231910
241910
252010
262011
272011
282011
292011
302011
312011

How May really feels in Koersel

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.

Koersel weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6612.11.28.20.3
Feb / 6011.31.89.60.7
Mar11° / 6012.50.911.52.3
Apr15° / 4810.9013.54.2
May18° / 6012.1015.35.5
Jun21° / 12°6912.4016.25.9
Jul23° / 14°7512.7015.96.4
Aug23° / 14°7512.2014.46.4
Sep19° / 11°5810.5012.45.9
Oct15° / 6111.3010.44.1
Nov10° / 6412.10.38.71.9
Dec / 7713.61.77.80.6

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 13% of May, with mostly cloudy or overcast conditions the remaining 70%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
43070
53070
62971
73070
83070
93070
103070
113070
123070
133070
143070
153070
163070
173070
183070
192971
202971
212971
222971
233070
243070
253070
263070
272971
283070
293070
303169
313169

Chance of precipitation in May

Any precipitation

Koersel gets around 60 mm of rain over 12.1 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 39% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
240
340
439
539
639
738
838
938
1038
1138
1238
1338
1439
1539
1639
1739
1839
1939
2039
2139
2239
2340
2440
2540
2640
2740
2841
2941
3042
3142

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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19910
29820
39820
49820
59730
69730
79730
89640
99640
109640
119550
129550
139550
149460
159460
169370
179370
189280
199091
209091
2189101
2288111
2386122
2485132
2584142
2682153
2781163
2880173
2978184
3077194
3175205

Wind in May

Winds average 12 km/h in May.

Across May, daily wind ranges from about 12 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 h 30 min at the start of May to 15 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over May. Sunrise moves from 5:21 AM to 4:38 AM, and sunset from 7:51 PM to 8:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:217:51
214.55:207:52
314.65:187:54
414.75:167:56
514.75:147:57
614.85:127:59
714.85:108:00
814.95:098:02
914.95:078:04
1015.05:058:05
1115.15:048:07
1215.15:028:08
1315.25:018:10
1415.24:598:11
1515.34:578:13
1615.34:568:14
1715.44:558:16
1815.44:538:17
1915.54:528:19
2015.54:508:20
2115.54:498:22
2215.64:488:23
2315.64:478:24
2415.74:458:26
2515.74:448:27
2615.84:438:28
2715.84:428:30
2815.84:418:31
2915.94:408:32
3015.94:398:33
3115.94:388:34

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.01 kWh/m².

For context, solar energy here swings from a low near 0.62 kWh/m² to a high of 5.25 kWh/m² in June across the year — May's 5.01 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.9Bright
124.9Bright
134.9Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in May

Is May a good time to visit Koersel?

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

5.5
Sightseeing
5th-best month of the year
2.1
Beach & pool
5th-best month of the year

May is a reasonable time to visit Koersel for sightseeing.

What to pack for Koersel in May

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

In May, Koersel sees daytime highs around 18°C and nights near 9°C. Worth packing: rain gear and sun protection. About 12 days see rain.

rain gearsun protection

UV index in Koersel in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks 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 Koersel peaks around July 13 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Koersel in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Koersel is worst in April — around 16 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1216 µg/m³Dec 1311 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Moderate
Mar16Moderate
Apr16Moderate
May15Moderate
Jun14Moderate
Jul13Moderate
Aug14Moderate
Sep13Moderate
Oct12Good
Nov11Good
Dec11Good
Location & terrain

Where is Koersel?

Koersel sits at 51.1°N, 5.3°E, 44 m above sea level, in Belgium. The nearest listed city is Heusden, 3.0 km away.

Topography around Koersel

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

Within 3 km, the terrain around Koersel has only modest variations in elevation — a maximum elevation change of 91 m around an average of 43 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 129 m; within 80 km, large variations in elevation — a maximum elevation change of 693 m.

The land around Koersel is covered by trees (54%), artificial surfaces (22%) and grassland (20%) within 3 km, trees (45%) and grassland (29%) within 16 km, and trees (33%), cropland (29%) and grassland (25%) within 80 km.

3 km
91 m
16 km
129 m
80 km
693 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Heusden 3.0 km · Beringen 3.0 km · Zolder 5.0 km · Houthalen 8.0 km · Helchteren 8.0 km · Zonhoven 10 km · Tessenderlo 13 km · Balen 14 km

Belgium travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 81% of US
price level, 2025
GDP per capita
$60,750
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
5.8
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 608
Religion
Roman Catholic 57%nonbeliever/agnostic 20%atheist 9%Muslim 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 Koersel (51.0591°, 5.2712°, elevation 44 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. 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).