Sliven weather in October

In October, Sliven sees average daytime highs of 16°C and overnight lows near 8°C, with 63 mm of precipitation across 7.8 wet days and about 10.8 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 13°C by the end. The sky is clear or mostly clear about 36% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of October to 10 h 06 min by month's end. Set against the rest of the year, October is Sliven's 5th-clearest and 8th-windiest month. For the whole year in context, see Sliven's year-round climate.

Daytime high
16°
6th warmest
Overnight low
7th coldest
Precipitation
63 mm
7.8 wet days
Daylight
10 h 48 min
6:35 AM – 5:24 PM
Cloud cover
56%
5th clearest
Wind
7 km/h
8th windiest
Solar energy
2.85 kWh/m²
Travel score
5.4
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 October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 19°C in the first days to 13°C by the end.

A typical October day in Sliven reaches about 16°C in the afternoon and slips back to 8°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 22°C. Set against its neighbours, October runs about 6°C cooler than September and about 7°C warmer than November.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12010
21910
31910
41910
51910
61910
7189
8189
9189
10189
11179
12179
13178
14178
15178
16168
17168
18168
19167
20157
21157
22157
23157
24156
25146
26146
27146
28146
29135
30135
31135

How October really feels in Sliven

Once humidity and wind are folded in, October 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

October 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 October compares with the rest of the year at a glance. October is the 6th-warmest and 6th-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 October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 13% of October, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35248
45248
55149
65149
75149
85149
95149
105149
115149
125050
135050
145050
154951
164852
174852
184753
194753
204753
214654
224654
234654
244654
254654
264753
274852
284951
294951
305050
315050

Chance of precipitation in October

Any precipitationSnow

Sliven gets around 63 mm of rain and snow over 7.8 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 25% and peaks near 27% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1270
2270
3270
4270
5270
6270
7270
8270
9270
10270
11271
12271
13271
14261
15261
16261
17261
18261
19252
20252
21252
22252
23242
24242
25232
26233
27233
28223
29223
30223
31214

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 91% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
177212
277212
378202
480191
581181
683161
785150
886140
987130
1088120
1189110
1290100
139190
149280
159370
169460
179460
189550
199550
209640
219640
229640
239730
249730
259820
269820
279820
289820
299910
309910
319910

Wind in October

Winds average 7 km/h in October.

Across October, 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
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 30 min at the start of October to 10 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over October. Sunrise moves from 6:17 AM to 6:54 AM, and sunset from 5:50 PM to 5:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.56:175:50
211.56:195:48
311.46:205:46
411.46:215:45
511.36:225:43
611.36:235:41
711.26:245:39
811.26:265:38
911.26:275:36
1011.16:285:34
1111.16:295:32
1211.06:305:31
1311.06:325:29
1410.96:335:27
1510.96:345:26
1610.86:355:24
1710.86:365:23
1810.76:385:21
1910.76:395:19
2010.66:405:18
2110.66:415:16
2210.56:435:15
2310.56:445:13
2410.46:455:12
2510.46:465:11
2610.46:485:09
2710.36:495:08
2810.36:505:06
2910.26:525:05
3010.26:535:04
3110.16:545:02

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 2.85 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 — October's 2.85 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.4Moderate
43.4Moderate
53.3Moderate
63.3Moderate
73.2Moderate
83.2Moderate
93.1Moderate
103.1Moderate
113.0Moderate
123.0Moderate
133.0Moderate
142.9Moderate
152.9Moderate
162.8Moderate
172.8Moderate
182.8Moderate
192.7Moderate
202.7Moderate
212.6Moderate
222.6Moderate
232.6Moderate
242.6Moderate
252.5Moderate
262.5Moderate
272.5Moderate
282.4Moderate
292.4Moderate
302.4Moderate
312.4Moderate
Planning a trip in October

Is October a good time to visit Sliven?

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

5.4
Sightseeing
6th-best month of the year
1.2
Beach & pool
6th-best month of the year

October is a reasonable time to visit Sliven for sightseeing.

What to pack for Sliven in October

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

In October, Sliven sees daytime highs around 16°C and nights near 8°C. Worth packing: a warm layer. About 8 days see rain.

a warm layer

UV index in Sliven in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 4 — enough to warrant sun protection. 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 October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October 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
October 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).