Sofia weather in September

In September, Sofia sees average daytime highs of 22°C and overnight lows near 10°C, with 35 mm of rain across 6.5 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 19°C by the end. The sky is clear or mostly clear about 46% 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 Sofia's 3rd-clearest and 5th-windiest month. For the whole year in context, see Sofia's year-round climate.

Daytime high
22°
4th warmest
Overnight low
10°
9th coldest
Rainfall
35 mm
6.5 wet days
Daylight
12 h 18 min
6:12 AM – 6:30 PM
Cloud cover
46%
3rd clearest
Wind
7 km/h
5th windiest
Solar energy
4.3 kWh/m²
Travel score
7.4
out of 10

Sofia is capital city of Bulgaria.

Air quality
Good
PM2.5 8.9 µg/m³ · 2019
Density
2,342/km²
people per km²
Founded
~390 BCE

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 24°C in the first days to 19°C by the end.

A typical September day in Sofia reaches about 22°C in the afternoon and slips back to 10°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 27°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)
12412
22412
32412
42412
52312
62311
72311
82311
92311
102311
112211
122211
132211
142210
152210
162210
172210
182110
192110
202110
212110
22219
23209
24209
25209
26209
27209
28209
29198
30198

How September really feels in Sofia

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.

Sofia weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°397.65.79.20.0
Feb / -4°397.4610.30.3
Mar10° / -0°5410.55.411.62.1
Apr15° / 5811.41.613.14.2
May19° / 7013.50.114.45.7
Jun23° / 12°6311.7015.16.7
Jul26° / 14°519.7014.87.1
Aug26° / 14°357.2013.77.5
Sep22° / 10°356.5012.37.4
Oct16° / 466.90.710.85.4
Nov / 366.72.49.62.2
Dec / -3°458.65.68.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 37%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17228
27129
37030
46931
56931
66832
76832
86733
96733
106634
116634
126535
136535
146436
156436
166337
176436
186337
196238
206238
216139
226040
235941
245941
255842
265743
275644
285644
295446
305446

Chance of precipitation in September

Any precipitation

Sofia gets around 35 mm of rain over 6.5 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 21% and peaks near 22% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
122
222
322
422
522
622
722
822
921
1021
1121
1221
1321
1420
1520
1620
1720
1820
1920
2020
2121
2221
2321
2421
2521
2621
2721
2821
2921
3021

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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
177221
279210
380200
481190
582180
684160
785150
885150
986140
1087130
1188120
1289110
1389110
1490100
159190
169190
179280
189280
199370
209370
219460
229460
239550
249550
259640
269640
279730
289730
299820
309820

Wind in September

Winds average 7 km/h in September.

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

0246810151015202530
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

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 5:56 AM to 6:28 AM, and sunset from 6:57 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:566:57
213.05:576:55
312.95:586:53
412.95:596:52
512.86:006:50
612.86:016:48
712.76:026:46
812.76:046:44
912.66:056:43
1012.66:066:41
1112.56:076:39
1212.56:086:37
1312.46:096:35
1412.46:106:33
1512.36:116:31
1612.36:126:30
1712.26:146:28
1812.26:156:26
1912.16:166:24
2012.16:176:22
2112.06:186:20
2212.06:196:18
2311.96:206:17
2411.96:216:15
2511.86:236:13
2611.86:246:11
2711.76:256:09
2811.76:266:07
2911.66:276:06
3011.66:286:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.3 kWh/m².

For context, solar energy here swings from a low near 1.58 kWh/m² to a high of 6.24 kWh/m² in July across the year — September's 4.3 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.0Bright
35.0Bright
44.9Bright
54.8Bright
64.8Bright
74.7Bright
84.7Bright
94.7Bright
104.6Bright
114.6Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.2Bright
194.1Bright
204.1Bright
214.0Bright
224.0Moderate
233.9Moderate
243.9Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.6Moderate
293.6Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Sofia?

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

7.4
Sightseeing
2nd-best month of the year
4.9
Beach & pool
4th-best month of the year

September is one of the better times to visit Sofia for general sightseeing.

What to pack for Sofia in September

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

In September, Sofia sees daytime highs around 22°C and nights near 10°C. Little to plan around — just the basics. About 7 days see rain.

UV index in Sofia 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 Sofia peaks around July 11 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 11UV 9Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr8Very high
May7High
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Sofia?

Sofia sits at 42.7°N, 23.3°E, 562 m above sea level, in Bulgaria. The nearest listed city is Pernik, 26 km away.

SamokovBotevgradDupnitsaVratsaBerkovitsaKyustendilPanagyurishte

Topography around Sofia

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

Within 3 km, the terrain around Sofia has only modest variations in elevation — a maximum elevation change of 97 m around an average of 554 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,775 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,775 m.

The land around Sofia is covered by artificial surfaces (68%) and trees (29%) within 3 km, cropland (33%) and trees (31%) within 16 km, and trees (64%) and grassland (21%) within 80 km.

3 km
97 m
16 km
1,775 m
80 km
2,775 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Pernik 26 km · Samokov 44 km · Botevgrad 45 km · Dupnitsa 51 km · Vratsa 60 km · Berkovitsa 62 km · Kyustendil 69 km · Panagyurishte 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 Sofia (42.6975°, 23.3241°, elevation 562 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).