Celje weather in August

In August, Celje sees average daytime highs of 25°C and overnight lows near 15°C, with 101 mm of rain across 12.1 wet days and about 14 hours of daylight. It is the 2nd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 23°C by the end. The sky is clear or mostly clear about 38% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 14 h 42 min at the start of August to 13 h 12 min by month's end. Set against the rest of the year, August is Celje's 1st-clearest and 12th-windiest month. For the whole year in context, see Celje's year-round climate.

Daytime high
25°
2nd warmest
Overnight low
15°
11th coldest
Rainfall
101 mm
12.1 wet days
Daylight
14 hours
5:03 AM – 7:03 PM
Cloud cover
51%
1st clearest
Wind
6 km/h
12th windiest
Solar energy
4.95 kWh/m²
Travel score
6.6
out of 10

Celje is city in Slovenia.

Air quality
Good
PM10 27.4 µg/m³ · 2019
Density
1,676/km²
people per km²
Founded
1451

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 26°C in the first days to 23°C by the end.

A typical August day in Celje reaches about 25°C in the afternoon and slips back to 15°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 30°C. Set against its neighbours, August runs on par with July and about 5°C warmer than September.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12616
22616
32616
42616
52616
62616
72616
82616
92616
102616
112616
122616
132615
142615
152515
162515
172515
182515
192515
202515
212515
222515
232415
242414
252414
262414
272414
282314
292314
302313
312313

How August really feels in Celje

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.

Celje weather by month

How August compares with the rest of the year at a glance. August is the 2nd-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°417.24.38.80.0
Feb / -2°537.44.3100.4
Mar11° / 639.93.211.62.6
Apr15° / 7611.40.813.34.4
May20° / 10°9513014.75.8
Jun23° / 14°10414015.56.3
Jul25° / 15°10513.3015.26.4
Aug25° / 15°10112.10146.6
Sep20° / 11°10311.2012.36.1
Oct15° / 889.10.310.74.5
Nov / 869.82.39.21.6
Dec / -2°668.94.58.50.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 40%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26238
36238
46337
56337
66238
76337
86337
96238
106238
116238
126238
136238
146238
156337
166238
176238
186139
196139
206139
216040
225941
235842
245842
255743
265644
275644
285545
295446
305446
315347

Chance of precipitation in August

Any precipitation

Celje gets around 101 mm of rain over 12.1 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 (%)
142
241
341
441
541
641
741
841
941
1041
1140
1240
1340
1439
1539
1638
1738
1838
1937
2037
2137
2237
2338
2438
2538
2639
2740
2840
2941
3041
3141

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 41% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11534438
21534438
31535428
41536428
51537417
61538407
71538407
81639396
91640386
101640385
111741375
121742374
131843364
141843363
151844353
161944353
171944342
181944342
192044342
202144332
212244332
222344321
232443311
242643301
252842291
263041271
273340261
283540241
293739231
304038211
314238201

Wind in August

Winds average 6 km/h in August, the calmest month.

Across August, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 42 min at the start of August to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over August. Sunrise moves from 4:45 AM to 5:23 AM, and sunset from 7:25 PM to 6:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.74:457:25
214.64:467:24
314.64:477:23
414.64:487:21
514.54:497:20
614.54:517:19
714.44:527:17
814.44:537:16
914.34:547:14
1014.34:567:13
1114.24:577:11
1214.24:587:09
1314.15:007:08
1414.15:017:06
1514.05:027:04
1614.05:037:03
1713.95:057:01
1813.95:066:59
1913.85:076:58
2013.85:096:56
2113.75:106:54
2213.75:116:52
2313.65:126:50
2413.65:146:49
2513.55:156:47
2613.55:166:45
2713.45:186:43
2813.45:196:41
2913.35:206:39
3013.35:216:37
3113.25:236:35

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.95 kWh/m².

For context, solar energy here swings from a low near 1.08 kWh/m² to a high of 5.72 kWh/m² in June across the year — August's 4.95 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.1Bright
135.1Bright
145.0Bright
155.0Bright
165.0Bright
174.9Bright
184.9Bright
194.8Bright
204.8Bright
214.7Bright
224.7Bright
234.6Bright
244.6Bright
254.5Bright
264.5Bright
274.4Bright
284.4Bright
294.3Bright
304.3Bright
314.2Bright
Planning a trip in August

Is August a good time to visit Celje?

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

6.6
Sightseeing
1st-best month of the year
5.9
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Celje for sightseeing.

What to pack for Celje in August

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

In August, Celje sees daytime highs around 25°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Celje in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Celje peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 15UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr7High
May7High
Jun8Very high
Jul8Very high
Aug7Very high
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Celje in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Celje 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).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 917 µg/m³Sep 2012 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb15Moderate
Mar17Moderate
Apr17Moderate
May15Moderate
Jun15Moderate
Jul14Moderate
Aug13Moderate
Sep12Good
Oct12Good
Nov12Good
Dec14Moderate
Location & terrain

Where is Celje?

Celje sits at 46.2°N, 15.3°E, 240 m above sea level, in Slovenia. The nearest listed city is Velenje, 18 km away.

VelenjeTrbovljeMariborNovo MestoPtujŽumberakSamoborZaprešić

Topography around Celje

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

Within 3 km, the terrain around Celje has significant variations in elevation — a maximum elevation change of 368 m around an average of 283 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 915 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,391 m.

The land around Celje is covered by trees (42%), artificial surfaces (25%) and grassland (24%) within 3 km, trees (62%) and grassland (27%) within 16 km, and trees (70%) within 80 km.

3 km
368 m
16 km
915 m
80 km
2,391 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Velenje 18 km · Trbovlje 18 km · Maribor 47 km · Novo Mesto 48 km · Ptuj 51 km · Žumberak 53 km · Samobor 59 km · Zaprešić 59 km

Slovenia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 63% of US
price level, 2025
GDP per capita
$37,376
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
Religion
Catholic 69%atheist 14%Orthodox 4%non-believer/agnostic 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 Celje (46.2309°, 15.2604°, elevation 240 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).