Sint-Gillis-Waas weather in May

In May, Sint-Gillis-Waas sees average daytime highs of 18°C and overnight lows near 10°C, with 61 mm of rain across 11.8 wet days and about 15.3 hours of daylight. It is the 5th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 16°C in the first days to 19°C by the end. The sky is clear or mostly clear about 19% 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 16 hours by month's end. Set against the rest of the year, May is Sint-Gillis-Waas's 5th-clearest and 8th-windiest month. For the whole year in context, see Sint-Gillis-Waas's year-round climate.

Daytime high
18°
5th warmest
Overnight low
10°
8th coldest
Rainfall
61 mm
11.8 wet days
Daylight
15 h 18 min
5:00 AM – 8:20 PM
Cloud cover
67%
5th clearest
Wind
13 km/h
8th windiest
Solar energy
5.09 kWh/m²
Travel score
5.3
out of 10

Sint-Gillis-Waas is town in Sint-Gillis-Waas municipality, Belgium.

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 16°C in the first days to 19°C by the end.

A typical May day in Sint-Gillis-Waas reaches about 18°C in the afternoon and slips back to 10°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 24°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
1168
2168
3168
4169
5169
6179
7179
8179
9179
10179
11179
12179
13179
141710
151710
161810
171810
181810
191810
201810
211810
221810
231811
241811
251911
261911
271911
281911
291911
301911
311911

How May really feels in Sint-Gillis-Waas

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.

Sint-Gillis-Waas weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6111.70.98.20.5
Feb / 53111.29.60.8
Mar10° / 5211.20.611.52.3
Apr14° / 4811.2013.53.9
May18° / 10°6111.8015.35.3
Jun20° / 13°6411.3016.35.9
Jul22° / 15°7412.4015.96.3
Aug22° / 14°7312014.46.3
Sep19° / 12°5710.6012.45.8
Oct15° / 5911.5010.44.1
Nov10° / 6412.10.48.72.0
Dec / 7113.217.70.7

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13466
23466
33466
43466
53466
63466
73466
83466
93466
103466
113466
123565
133565
143466
153466
163565
173565
183565
193565
203565
213565
223565
233565
243565
253565
263565
273664
283466
293466
303367
313367

Chance of precipitation in May

Any precipitation

Sint-Gillis-Waas gets around 61 mm of rain over 11.8 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 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
240
340
439
539
638
738
837
937
1037
1137
1237
1337
1437
1538
1638
1738
1838
1938
2039
2139
2239
2339
2439
2539
2639
2739
2839
2940
3040
3140

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 89% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19820
29820
39730
49730
59640
69640
79550
89550
99460
109460
119460
129370
139370
149271
159181
169181
179091
189091
1989101
2089101
2188111
2286122
2385132
2485132
2583143
2682153
2781163
2879174
2978184
3076195
3175205

Wind in May

Winds average 13 km/h in May.

Across May, daily wind ranges from about 13 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
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in May

DaylightNight

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

Days grow by about 90 minutes over May. Sunrise moves from 5:26 AM to 4:42 AM, and sunset from 7:56 PM to 8:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:267:56
214.65:247:57
314.65:227:59
414.75:208:01
514.75:188:02
614.85:168:04
714.95:158:06
814.95:138:07
915.05:118:09
1015.05:098:10
1115.15:088:12
1215.15:068:13
1315.25:058:15
1415.25:038:17
1515.35:018:18
1615.35:008:20
1715.44:588:21
1815.44:578:23
1915.54:568:24
2015.54:548:25
2115.64:538:27
2215.64:528:28
2315.74:518:30
2415.74:498:31
2515.74:488:32
2615.84:478:34
2715.84:468:35
2815.94:458:36
2915.94:448:37
3015.94:438:39
3116.04:428:40

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.09 kWh/m².

For context, solar energy here swings from a low near 0.62 kWh/m² to a high of 5.33 kWh/m² in June across the year — May's 5.09 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
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 Sint-Gillis-Waas?

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

5.3
Sightseeing
5th-best month of the year
1.6
Beach & pool
5th-best month of the year

May is a reasonable time to visit Sint-Gillis-Waas for sightseeing.

What to pack for Sint-Gillis-Waas in May

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

In May, Sint-Gillis-Waas sees daytime highs around 18°C and nights near 10°C. Worth packing: rain gear and sun protection. About 12 days see rain.

rain gearsun protection

Sea temperature near Sint-Gillis-Waas in May

The nearest coast averages about 12°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 55 km away) is warmest in August at about 19°C and coldest in February near 6°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan6Bracing
Feb6Bracing
Mar6Bracing
Apr9Bracing
May12Bracing
Jun16Cool
Jul18Cool
Aug19Cool
Sep18Cool
Oct15Bracing
Nov11Bracing
Dec8Bracing

UV index in Sint-Gillis-Waas 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 Sint-Gillis-Waas peaks around June 23 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 23UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Sint-Gillis-Waas 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 Sint-Gillis-Waas is worst in April — around 17 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1317 µg/m³Dec 1511 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb13Moderate
Mar17Moderate
Apr17Moderate
May16Moderate
Jun15Moderate
Jul13Moderate
Aug15Moderate
Sep14Moderate
Oct12Moderate
Nov12Good
Dec11Good
Location & terrain

Where is Sint-Gillis-Waas?

Sint-Gillis-Waas sits at 51.2°N, 4.1°E, 5 m above sea level, in Belgium. The nearest listed city is Stekene, 6.0 km away.

LokerenBornem

Topography around Sint-Gillis-Waas

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sint-Gillis-Waas.

Within 3 km, the terrain around Sint-Gillis-Waas has only modest variations in elevation — a maximum elevation change of 25 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 71 m; within 80 km, significant variations in elevation — a maximum elevation change of 290 m.

The land around Sint-Gillis-Waas is covered by cropland (39%) and grassland (36%) within 3 km, cropland (33%) and grassland (28%) within 16 km, and cropland (31%) and grassland (23%) within 80 km.

3 km
25 m
16 km
71 m
80 km
290 m
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Stekene 6.0 km · Sint-Niklaas 6.0 km · Beveren 9.0 km · Temse 12 km · Hamme 13 km · Zwijndrecht 14 km · Lokeren 16 km · Bornem 16 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 Sint-Gillis-Waas (51.2191°, 4.1237°, elevation 5 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).