Banská Bystrica weather in September

In September, Banská Bystrica sees average daytime highs of 17°C and overnight lows near 7°C, with 78 mm of rain across 11 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 15°C by the end. The sky is clear or mostly clear about 27% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Banská Bystrica's 3rd-clearest and 6th-windiest month. For the whole year in context, see Banská Bystrica's year-round climate.

Daytime high
17°
4th warmest
Overnight low
9th coldest
Rainfall
78 mm
11 wet days
Daylight
12 h 24 min
5:27 AM – 5:48 PM
Cloud cover
61%
3rd clearest
Wind
7 km/h
6th windiest
Solar energy
3.34 kWh/m²
Travel score
5.2
out of 10

Banská Bystrica is city in central Slovakia.

Air quality
Moderate
PM2.5 13.9 µg/m³ · 2019
Density
722/km²
people per km²
Founded
1255

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 19°C in the first days to 15°C by the end.

A typical September day in Banská Bystrica reaches about 17°C in the afternoon and slips back to 7°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 22°C. Set against its neighbours, September runs about 5°C cooler than August and about 6°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
1209
2199
3199
4199
5198
6198
7188
8188
9188
10188
11188
12188
13177
14177
15177
16177
17177
18177
19167
20166
21166
22166
23166
24166
25156
26156
27156
28155
29155
30155

How September really feels in Banská Bystrica

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.

Banská Bystrica weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -7°4910.18.98.50.0
Feb / -6°5110.18.69.80.0
Mar / -2°5811.25.611.60.6
Apr12° / 6911.81.713.43.2
May17° / 10615.40154.8
Jun20° / 10°11814.8015.95.6
Jul22° / 11°11614.7015.56.0
Aug22° / 11°9812.2014.26.4
Sep17° / 7811012.45.2
Oct11° / 6710.30.810.52.8
Nov / -0°6010.84.290.4
Dec / -5°5510.58.48.10.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% 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 55%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25248
35149
45149
54951
64951
74951
84852
94852
104654
114555
124555
134456
144555
154456
164357
174357
184357
194357
204258
214357
224357
234357
244357
254357
264258
274357
284258
294258
304060

Chance of precipitation in September

Any precipitation

Banská Bystrica gets around 78 mm of rain over 11 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 37% and peaks near 40% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
240
340
440
540
640
740
840
940
1040
1140
1239
1339
1439
1538
1638
1738
1837
1937
2036
2136
2235
2334
2434
2534
2634
2734
2834
2934
3034

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 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
172244
274233
375223
477212
578202
679201
780191
881181
982180
1083170
1184160
1285150
1387130
1488120
1589110
1689110
1790100
189190
199280
209370
219370
229460
239550
249550
259640
269640
279730
289730
299730
309730

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 h 18 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 108 minutes over September. Sunrise moves from 5:05 AM to 5:48 AM, and sunset from 6:21 PM to 5:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:056:21
213.25:076:19
313.15:086:17
413.15:106:15
513.05:116:12
613.05:136:10
712.95:146:08
812.85:156:06
912.85:176:04
1012.75:186:02
1112.75:205:59
1212.65:215:57
1312.55:235:55
1412.55:245:53
1512.45:265:51
1612.45:275:48
1712.35:295:46
1812.25:305:44
1912.25:325:42
2012.15:335:39
2112.05:345:37
2212.05:365:35
2311.95:375:33
2411.95:395:31
2511.85:405:28
2611.75:425:26
2711.75:435:24
2811.65:455:22
2911.65:465:20
3011.55:485:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.34 kWh/m².

For context, solar energy here swings from a low near 0.85 kWh/m² to a high of 5.57 kWh/m² in June across the year — September's 3.34 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.0Moderate
33.9Moderate
43.9Moderate
53.8Moderate
63.8Moderate
73.7Moderate
83.7Moderate
93.6Moderate
103.6Moderate
113.5Moderate
123.5Moderate
133.4Moderate
143.4Moderate
153.4Moderate
163.3Moderate
173.3Moderate
183.2Moderate
193.2Moderate
203.1Moderate
213.1Moderate
223.0Moderate
233.0Moderate
243.0Moderate
252.9Moderate
262.9Moderate
272.8Moderate
282.8Moderate
292.7Moderate
302.7Moderate
Planning a trip in September

Is September a good time to visit Banská Bystrica?

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

5.2
Sightseeing
4th-best month of the year
1.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Banská Bystrica for sightseeing.

What to pack for Banská Bystrica in September

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

In September, Banská Bystrica sees daytime highs around 17°C and nights near 7°C. Worth packing: a warm layer and rain gear. About 11 days see rain.

a warm layerrain gear

UV index in Banská Bystrica in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Banská Bystrica peaks around July 12 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. 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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 12UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr6High
May6High
Jun8Very high
Jul8Very high
Aug7High
Sep5Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Banská Bystrica 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 Banská Bystrica is worst in June — around 18 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 10 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Banská Bystrica's WHO annual average of 13.9 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJun 1918 µg/m³Dec 1410 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Moderate
Mar16Moderate
Apr16Moderate
May16Moderate
Jun18Moderate
Jul17Moderate
Aug16Moderate
Sep13Moderate
Oct11Good
Nov11Good
Dec10Good
Location & terrain

Where is Banská Bystrica?

Banská Bystrica sits at 48.7°N, 19.1°E, 329 m above sea level, in Slovakia. The nearest listed city is Zvolen, 18 km away.

Žiar nad HronomHandlováBreznoPrievidzaRužomberokMartinBojnice

Topography around Banská Bystrica

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

Within 3 km, the terrain around Banská Bystrica has significant variations in elevation — a maximum elevation change of 339 m around an average of 422 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,278 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,267 m.

The land around Banská Bystrica is covered by trees (50%) and artificial surfaces (27%) within 3 km, trees (76%) within 16 km, and trees (65%) within 80 km.

3 km
339 m
16 km
1,278 m
80 km
2,267 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Zvolen 18 km · Žiar nad Hronom 27 km · Handlová 29 km · Brezno 36 km · Prievidza 38 km · Ružomberok 39 km · Martin 40 km · Bojnice 42 km

Slovakia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E / F
230 V · 50 Hz
Prices
≈ 58% of US
price level, 2025
GDP per capita
$28,544
2025
Happiness
6.3 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2023
Road deaths
6.1
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 606
Religion
Roman Catholic 56%none 24%Evangelical Church of the Augsburg Confession 5%Greek Catholic 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 Banská Bystrica (48.7395°, 19.1493°, elevation 329 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).