Slagelse weather in August

In August, Slagelse sees average daytime highs of 20°C and overnight lows near 15°C, with 69 mm of rain across 11.5 wet days and about 14.8 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 19°C by the end. The sky is clear or mostly clear about 25% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 15 h 48 min at the start of August to 13 h 42 min by month's end. Set against the rest of the year, August is Slagelse's 5th-clearest and 10th-windiest month. For the whole year in context, see Slagelse's year-round climate.

Daytime high
20°
2nd warmest
Overnight low
15°
12th coldest
Rainfall
69 mm
11.5 wet days
Daylight
14 h 48 min
4:55 AM – 7:43 PM
Cloud cover
61%
5th clearest
Wind
18 km/h
10th windiest
Solar energy
4.64 kWh/m²
Travel score
6.1
out of 10

Slagelse is town in Denmark.

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 21°C in the first days to 19°C by the end.

A typical August day in Slagelse reaches about 20°C in the afternoon and slips back to 15°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 24°C. Set against its neighbours, August runs on par with July and about 4°C warmer than September.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12116
22116
32116
42116
52116
62116
72116
82115
92115
102115
112015
122015
132015
142015
152015
162015
172015
182015
192015
202015
212015
222015
231915
241915
251915
261914
271914
281914
291914
301914
311814

How August really feels in Slagelse

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.

Slagelse weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 5712.33.87.50.0
Feb / 449.73.69.20.0
Mar / 4510.22.211.40.3
Apr10° / 3790.413.82.2
May14° / 5210.2015.94.2
Jun18° / 12°6510.8017.15.5
Jul20° / 15°6711.1016.66.2
Aug20° / 15°6911.5014.86.1
Sep16° / 12°6010.4012.55.0
Oct12° / 6712.2010.12.9
Nov / 5812.30.88.11.0
Dec / 5911.92.36.90.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14654
24654
34753
44753
54654
64654
74654
84654
94654
104654
114654
124654
134555
144555
154555
164654
174555
184555
194555
204555
214654
224654
234555
244555
254555
264555
274555
284456
294357
304357
314357

Chance of precipitation in August

Any precipitation

Slagelse gets around 69 mm of rain over 11.5 wet days in August, the wettest month. 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 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
435
535
636
736
836
936
1037
1137
1237
1337
1437
1537
1637
1737
1837
1937
2037
2137
2237
2337
2438
2538
2638
2738
2838
2937
3037
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 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12849203
22849203
32849212
42849212
52949212
62949212
73048211
83048211
93148211
103247211
113247210
123346200
133346200
143446200
153545200
163545200
173644190
183744191
193843181
203843181
213942171
224142161
234241161
244341151
254540141
264739131
274939121
285038111
295237101
30543691
31553681

Wind in August

Winds average 18 km/h in August.

Across August, daily wind ranges from about 17 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze
3119light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 15 h 48 min at the start of August to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 126 minutes over August. Sunrise moves from 4:27 AM to 5:24 AM, and sunset from 8:15 PM to 7:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.84:278:15
215.74:288:13
315.74:308:11
415.64:328:09
515.54:348:07
615.54:368:05
715.44:388:03
815.34:408:01
915.34:417:58
1015.24:437:56
1115.14:457:54
1215.14:477:52
1315.04:497:49
1414.94:517:47
1514.94:537:45
1614.84:557:43
1714.74:577:40
1814.74:597:38
1914.65:017:35
2014.55:037:33
2114.45:057:30
2214.45:077:28
2314.35:087:26
2414.25:107:23
2514.15:127:21
2614.15:147:18
2714.05:167:15
2813.95:187:13
2913.85:207:10
3013.85:227:08
3113.75:247:05

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.64 kWh/m².

For context, solar energy here swings from a low near 0.4 kWh/m² to a high of 6.04 kWh/m² in June across the year — August's 4.64 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.3Bright
35.3Bright
45.2Bright
55.2Bright
65.1Bright
75.1Bright
85.0Bright
95.0Bright
104.9Bright
114.9Bright
124.8Bright
134.8Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.3Bright
234.3Bright
244.2Bright
254.2Bright
264.1Bright
274.1Bright
284.0Bright
294.0Moderate
303.9Moderate
313.9Moderate
Planning a trip in August

Is August a good time to visit Slagelse?

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

6.1
Sightseeing
2nd-best month of the year
3.1
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Slagelse for sightseeing.

What to pack for Slagelse in August

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

In August, Slagelse sees daytime highs around 20°C and nights near 15°C. Worth packing: rain gear and sun protection. About 12 days see rain.

rain gearsun protection

Sea temperature near Slagelse in August

The nearest coast averages about 18°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 15 km away) is warmest in August at about 18°C and coldest in February near 2°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
Jan3Bracing
Feb2Bracing
Mar3Bracing
Apr5Bracing
May11Bracing
Jun15Bracing
Jul18Cool
Aug18Cool
Sep16Cool
Oct12Bracing
Nov8Bracing
Dec5Bracing

UV index in Slagelse in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Slagelse peaks around June 22 at about 6 (high) — a little sun protection helps at midday. 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 22UV 6Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5Moderate
Jun6High
Jul6High
Aug5Moderate
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Slagelse?

Slagelse sits at 55.4°N, 11.4°E, 51 m above sea level, in Denmark. The nearest listed city is Klinteby Frihed, 28 km away.

Klinteby FrihedRingstedNæstvedKalundborgNyborgHolbækKøgeRoskilde

Topography around Slagelse

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

Within 3 km, the terrain around Slagelse has only modest variations in elevation — a maximum elevation change of 90 m around an average of 47 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 111 m; within 80 km, only modest variations in elevation — a maximum elevation change of 145 m.

The land around Slagelse is covered by artificial surfaces (30%), grassland (24%) and cropland (24%) within 3 km, cropland (50%) within 16 km, and water (49%) and cropland (29%) within 80 km.

3 km
90 m
16 km
111 m
80 km
145 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Klinteby Frihed 28 km · Ringsted 28 km · Næstved 32 km · Kalundborg 35 km · Nyborg 37 km · Holbæk 42 km · Køge 53 km · Roskilde 53 km

Denmark travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E / F / K
230 V · 50 Hz
Prices
≈ 92% of US
price level, 2025
GDP per capita
$76,970
2025
Happiness
7.5 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
3.7
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 611
Religion
Evangelical Lutheran 71%other/none/unspecified 24%Muslim 4%

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 Slagelse (55.4028°, 11.3546°, elevation 51 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).