Kalmthout weather in August

In August, Kalmthout sees average daytime highs of 22°C and overnight lows near 14°C, with 76 mm of rain across 12.3 wet days and about 14.4 hours of daylight. It is the 2nd-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 21°C by the end. The sky is clear or mostly clear about 16% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 15 h 12 min at the start of August to 13 h 30 min by month's end. Set against the rest of the year, August is Kalmthout's 1st-clearest and 12th-windiest month. For the whole year in context, see Kalmthout's year-round climate.

Daytime high
22°
2nd warmest
Overnight low
14°
11th coldest
Rainfall
76 mm
12.3 wet days
Daylight
14 h 24 min
5:34 AM – 7:58 PM
Cloud cover
65%
1st clearest
Wind
12 km/h
12th windiest
Solar energy
4.37 kWh/m²
Travel score
6.2
out of 10

Kalmthout is town in Kalmthout municipality, Belgium.

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 21°C by the end.

A typical August day in Kalmthout reaches about 22°C in the afternoon and slips back to 14°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 28°C. Set against its neighbours, August runs on par with July and about 3°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12315
22315
32315
42315
52315
62315
72315
82315
92315
102314
112314
122314
132314
142314
152214
162214
172214
182214
192214
202214
212214
222214
232214
242214
252113
262113
272113
282113
292113
302113
312113

How August really feels in Kalmthout

Once humidity and wind are folded in, August 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

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

Kalmthout weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6311.918.20.4
Feb / 55111.59.60.7
Mar10° / 5411.50.711.52.2
Apr14° / 4710.80.113.54.0
May18° / 6212.1015.35.4
Jun20° / 12°6611.1016.36.0
Jul22° / 14°7713.4015.96.2
Aug22° / 14°7612.3014.46.2
Sep19° / 12°5911012.45.7
Oct15° / 6211.3010.44.1
Nov10° / 6412.20.48.61.9
Dec / 7413.41.17.70.6

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 22% of August, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14258
24357
34258
44258
54258
64159
74060
84060
94060
104060
114060
124060
134060
144060
153961
163961
173961
183862
193862
203763
213763
223763
233664
243664
253664
263664
273565
283565
293565
303466
313466

Chance of precipitation in August

Any precipitation

Kalmthout gets around 76 mm of rain over 12.3 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 40% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
239
339
439
538
638
738
838
939
1039
1140
1240
1341
1441
1541
1642
1742
1842
1942
2042
2142
2242
2341
2441
2541
2640
2739
2839
2938
3038
3137

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 43% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12648233
22648233
32748233
42747223
52847223
62947223
72947223
83046223
93046213
103145213
113145213
123244213
133244213
143344213
153343213
163443203
173443203
183543203
193542193
203642193
213742183
223842173
234041173
244140163
254340152
264439142
274638142
284837132
294936132
305136121
315235121

Wind in August

Winds average 12 km/h in August, the calmest month.

Across August, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light 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 August

DaylightNight

Daylight runs from about 15 h 12 min at the start of August to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 102 minutes over August. Sunrise moves from 5:11 AM to 5:59 AM, and sunset from 8:26 PM to 7:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.25:118:26
215.25:128:24
315.15:148:22
415.15:158:21
515.05:178:19
615.05:188:17
714.95:208:15
814.95:218:14
914.85:238:12
1014.85:258:10
1114.75:268:08
1214.65:288:06
1314.65:298:04
1414.55:318:02
1514.55:338:00
1614.45:347:58
1714.35:367:56
1814.35:377:54
1914.25:397:52
2014.25:417:50
2114.15:427:48
2214.05:447:46
2314.05:467:43
2413.95:477:41
2513.85:497:39
2613.85:507:37
2713.75:527:35
2813.65:547:32
2913.65:557:30
3013.55:577:28
3113.55:597:26

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.37 kWh/m².

For context, solar energy here swings from a low near 0.6 kWh/m² to a high of 5.27 kWh/m² in June across the year — August's 4.37 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.8Bright
64.8Bright
74.8Bright
84.7Bright
94.7Bright
104.6Bright
114.6Bright
124.5Bright
134.5Bright
144.5Bright
154.4Bright
164.4Bright
174.3Bright
184.3Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.0Bright
244.0Moderate
253.9Moderate
263.9Moderate
273.8Moderate
283.8Moderate
293.7Moderate
303.7Moderate
313.6Moderate
Planning a trip in August

Is August a good time to visit Kalmthout?

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

6.2
Sightseeing
1st-best month of the year
4.4
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Kalmthout for sightseeing.

What to pack for Kalmthout in August

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

In August, Kalmthout sees daytime highs around 22°C and nights near 14°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Kalmthout in August

The nearest coast averages about 19°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 65 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
Jun15Cool
Jul18Cool
Aug19Cool
Sep18Cool
Oct15Bracing
Nov11Bracing
Dec8Bracing

UV index in Kalmthout in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Kalmthout 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
Location & terrain

Where is Kalmthout?

Kalmthout sits at 51.4°N, 4.5°E, 21 m above sea level, in Belgium. The nearest listed city is Kapellen, 8.0 km away.

MerksemRoosendaalSchilde

Topography around Kalmthout

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

Within 3 km, the terrain around Kalmthout has only modest variations in elevation — a maximum elevation change of 36 m around an average of 24 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 57 m; within 80 km, only modest variations in elevation — a maximum elevation change of 188 m.

The land around Kalmthout is covered by trees (44%) and grassland (34%) within 3 km, trees (36%), grassland (27%) and cropland (20%) within 16 km, and grassland (28%), cropland (24%) and trees (21%) within 80 km.

3 km
36 m
16 km
57 m
80 km
188 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Kapellen 8.0 km · Stabroek 9.0 km · Brasschaat 10 km · Ekeren 12 km · Schoten 15 km · Merksem 15 km · Roosendaal 16 km · Schilde 18 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 Kalmthout (51.3844°, 4.4756°, elevation 21 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).