Yambol weather in September

In September, Yambol sees average daytime highs of 25°C and overnight lows near 14°C, with 38 mm of rain across 5.1 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 23°C by the end. The sky is clear or mostly clear about 53% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Yambol's 3rd-clearest and 5th-windiest month. For the whole year in context, see Yambol's year-round climate.

Daytime high
25°
4th warmest
Overnight low
14°
9th coldest
Rainfall
38 mm
5.1 wet days
Daylight
12 h 18 min
6:00 AM – 6:17 PM
Cloud cover
41%
3rd clearest
Wind
8 km/h
5th windiest
Solar energy
4.4 kWh/m²
Travel score
7.8
out of 10

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

Density
702/km²
people per km²

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 27°C in the first days to 23°C by the end.

A typical September day in Yambol reaches about 25°C in the afternoon and slips back to 14°C overnight — a 11°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, September runs about 5°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12816
22816
32716
42716
52716
62715
72715
82615
92615
102615
112615
122615
132614
142514
152514
162514
172514
182514
192414
202413
212413
222413
232413
242313
252313
262313
272313
282312
292212
302212

How September really feels in Yambol

Once humidity and wind are folded in, September 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

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

Yambol weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°487.33.29.20.3
Feb / 466.82.510.31.4
Mar12° / 568.71.811.63.2
Apr17° / 508.90.313.15.5
May22° / 12°5810.7014.46.7
Jun27° / 16°489.8015.16.7
Jul29° / 18°437.6014.86.0
Aug30° / 18°274.6013.76.2
Sep25° / 14°385.1012.37.8
Oct19° / 5460.110.86.5
Nov12° / 5470.89.63.5
Dec / 598.22.68.90.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 53% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 28%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28119
38020
47921
57921
67822
77822
87822
97723
107723
117624
127624
137525
147525
157426
167327
177228
187129
197030
207030
216832
226733
236733
246634
256535
266337
276337
286238
296139
306139

Chance of precipitation in September

Any precipitation

Yambol gets around 38 mm of rain over 5.1 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 16% and peaks near 20% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
116
216
316
416
516
616
716
815
915
1015
1115
1214
1314
1414
1515
1615
1715
1815
1916
2016
2117
2217
2318
2418
2518
2619
2719
2819
2919
3020

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 52% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13537263
23737242
33937222
44137202
54237182
64438172
74538152
84639141
94639131
104740121
114740111
124840111
134940101
144940101
155040101
165139100
175238100
185337100
195436100
205535100
215634100
225832100
235931100
24613090
25622990
26632890
27632890
28652780
29652780
30672670

Wind in September

Winds average 8 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 5:43 AM to 6:15 AM, and sunset from 6:44 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:436:44
213.05:446:42
312.95:466:40
412.95:476:39
512.85:486:37
612.85:496:35
712.75:506:33
812.75:516:31
912.65:526:30
1012.65:536:28
1112.55:546:26
1212.55:556:24
1312.45:576:22
1412.45:586:21
1512.35:596:19
1612.36:006:17
1712.26:016:15
1812.26:026:13
1912.16:036:11
2012.16:046:09
2112.06:056:08
2212.06:066:06
2311.96:086:04
2411.96:096:02
2511.86:106:00
2611.86:115:58
2711.76:125:57
2811.76:135:55
2911.66:145:53
3011.66:155:51

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.4 kWh/m².

For context, solar energy here swings from a low near 1.44 kWh/m² to a high of 6.54 kWh/m² in June across the year — September's 4.4 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.1Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.4Bright
174.3Bright
184.3Bright
194.2Bright
204.2Bright
214.1Bright
224.0Bright
234.0Bright
243.9Moderate
253.9Moderate
263.8Moderate
273.8Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Yambol?

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

7.8
Sightseeing
1st-best month of the year
7.0
Beach & pool
3rd-best month of the year

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

What to pack for Yambol in September

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

In September, Yambol sees daytime highs around 25°C and nights near 14°C. Worth packing: light clothes. About 5 days see rain.

light clothes

UV index in Yambol in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Yambol 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateVery 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 Yambol in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Yambol 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 Yambol?

Yambol sits at 42.5°N, 26.5°E, 115 m above sea level, in Bulgaria. The nearest listed city is Sliven, 27 km away.

Nova ZagoraKarnobatAytosStara ZagoraHarmanliBurgasSvilengrad

Topography around Yambol

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

Within 3 km, the terrain around Yambol has only modest variations in elevation — a maximum elevation change of 104 m around an average of 136 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 400 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,518 m.

The land around Yambol is covered by cropland (42%) and artificial surfaces (31%) within 3 km, cropland (81%) within 16 km, and cropland (40%) and trees (39%) within 80 km.

3 km
104 m
16 km
400 m
80 km
1,518 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Sliven 27 km · Nova Zagora 40 km · Karnobat 44 km · Aytos 66 km · Stara Zagora 71 km · Harmanli 79 km · Burgas 79 km · Svilengrad 83 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 Yambol (42.4824°, 26.5001°, elevation 115 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).