Sliven weather in August

In August, Sliven sees average daytime highs of 27°C and overnight lows near 16°C, with 56 mm of rain across 8 wet days and about 13.7 hours of daylight. It is the 1st-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 26°C by the end. The sky is clear or mostly clear about 60% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 14 h 24 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Sliven's 1st-clearest and 11th-windiest month. For the whole year in context, see Sliven's year-round climate.

Daytime high
27°
1st warmest
Overnight low
16°
12th coldest
Rainfall
56 mm
8 wet days
Daylight
13 h 48 min
5:26 AM – 7:11 PM
Cloud cover
35%
1st clearest
Wind
7 km/h
11th windiest
Solar energy
5.87 kWh/m²
Travel score
7.2
out of 10

Sliven is city in Sliven municipality, Sliven oblast, Bulgaria.

Air quality
Good
PM10 17.8 µg/m³ · 2019
Density
432/km²
people per km²

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 28°C in the first days to 26°C by the end.

A typical August day in Sliven reaches about 27°C in the afternoon and slips back to 16°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 31°C. Set against its neighbours, August runs on par with July and about 5°C warmer than September.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12817
22817
32817
42817
52817
62817
72817
82817
92817
102817
112817
122817
132817
142717
152717
162716
172716
182716
192716
202716
212716
222716
232716
242716
252616
262615
272615
282615
292615
302615
312515

How August really feels in Sliven

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.

Sliven weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°537.75.19.20.0
Feb / -2°5485.110.30.3
Mar10° / 6710.74.311.62.0
Apr15° / 7512.30.913.14.2
May20° / 10°10614.5014.45.7
Jun24° / 14°10014015.16.3
Jul27° / 16°8911.7014.86.7
Aug27° / 16°568013.77.2
Sep22° / 12°587.8012.37.3
Oct16° / 637.80.410.85.4
Nov10° / 587.42.19.62.3
Dec / -1°638.64.58.90.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 60% 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 18%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18020
28020
38020
48020
58020
68119
78218
88218
98218
108218
118218
128317
138317
148317
158416
168515
178515
188515
198515
208515
218515
228515
238515
248317
258317
268218
278119
288020
297921
307822
317723

Chance of precipitation in August

Any precipitation

Sliven gets around 56 mm of rain over 8 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 27% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
132
231
330
430
529
628
727
826
926
1025
1125
1225
1325
1425
1525
1625
1725
1825
1925
2025
2125
2226
2326
2426
2527
2627
2727
2827
2927
3027
3127

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. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
16374710
26374710
36374710
46384610
57394510
6739449
7840439
8841429
9942409
101043398
111044388
121145368
131246348
141247337
151348327
161449317
171549306
181649296
191651285
201849285
211949285
222049274
232248274
242447263
252646253
262845252
273044242
283343232
293542211
303841201
314140191

Wind in August

Winds average 7 km/h in August.

Across August, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
318calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 24 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over August. Sunrise moves from 5:10 AM to 5:43 AM, and sunset from 7:31 PM to 6:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.45:107:31
214.35:117:30
314.35:127:29
414.25:137:28
514.25:147:27
614.25:157:25
714.15:167:24
814.15:177:23
914.05:197:21
1014.05:207:20
1114.05:217:19
1213.95:227:17
1313.95:237:16
1413.85:247:14
1513.85:257:13
1613.85:267:11
1713.75:277:10
1813.75:287:08
1913.65:297:07
2013.65:317:05
2113.55:327:04
2213.55:337:02
2313.45:347:00
2413.45:356:59
2513.35:366:57
2613.35:376:55
2713.35:386:54
2813.25:396:52
2913.25:416:50
3013.15:426:48
3113.15:436:47

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.87 kWh/m².

For context, solar energy here swings from a low near 1.43 kWh/m² to a high of 6.45 kWh/m² in June across the year — August's 5.87 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.2Intense
56.1Intense
66.1Intense
76.1Intense
86.1Intense
96.1Intense
106.0Intense
116.0Intense
126.0Intense
136.0Bright
146.0Bright
155.9Bright
165.9Bright
175.9Bright
185.8Bright
195.8Bright
205.8Bright
215.7Bright
225.7Bright
235.7Bright
245.6Bright
255.6Bright
265.5Bright
275.5Bright
285.4Bright
295.4Bright
305.3Bright
315.2Bright
Planning a trip in August

Is August a good time to visit Sliven?

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

7.2
Sightseeing
2nd-best month of the year
7.3
Beach & pool
1st-best month of the year

August is one of the better times to visit Sliven for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Sliven in August

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

In August, Sliven sees daytime highs around 27°C and nights near 16°C. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Sliven in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sliven peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 17UV 9Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr8Very high
May6High
Jun8Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Sliven 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 Sliven is worst in March — around 16 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (September, 10 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodMar 1916 µg/m³Sep 1910 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb14Moderate
Mar16Moderate
Apr15Moderate
May13Moderate
Jun13Moderate
Jul12Good
Aug11Good
Sep10Good
Oct10Good
Nov11Good
Dec11Good
Location & terrain

Where is Sliven?

Sliven sits at 42.7°N, 26.3°E, 281 m above sea level, in Bulgaria. The nearest listed city is Yambol, 27 km away.

Nova ZagoraKarnobatStara ZagoraTargovishteGorna OryahovitsaVeliko TarnovoPopovo

Topography around Sliven

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

Within 3 km, the terrain around Sliven has significant variations in elevation — a maximum elevation change of 598 m around an average of 351 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,041 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,510 m.

The land around Sliven is covered by trees (43%), artificial surfaces (33%) and grassland (21%) within 3 km, trees (52%) and cropland (29%) within 16 km, and trees (42%) and cropland (40%) within 80 km.

3 km
598 m
16 km
1,041 m
80 km
1,510 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Yambol 27 km · Nova Zagora 34 km · Karnobat 54 km · Stara Zagora 63 km · Targovishte 66 km · Gorna Oryahovitsa 71 km · Veliko Tarnovo 72 km · Popovo 74 km

Bulgaria travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 23% of US
price level, 2025
GDP per capita
$20,328
2025
Happiness
5.7 / 10
World Happiness, 2025
Safe drinking water
96%
of population, 2024
Homicide rate
1.1
per 100k, 2023
Road deaths
9.2
per 100k/yr, 2019
Income group
High
World Bank
English
High
EF EPI 594
Religion
Christian 65%Muslim 10%none 5%other 0%

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 Sliven (42.6861°, 26.3256°, elevation 281 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).