Trenčín weather in September

In September, Trenčín sees average daytime highs of 19°C and overnight lows near 10°C, with 76 mm of rain across 10.8 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 21°C in the first days to 16°C by the end. The sky is clear or mostly clear about 29% 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 Trenčín's 3rd-clearest and 9th-windiest month. For the whole year in context, see Trenčín's year-round climate.

Daytime high
19°
4th warmest
Overnight low
10°
9th coldest
Rainfall
76 mm
10.8 wet days
Daylight
12 h 24 min
5:32 AM – 5:53 PM
Cloud cover
59%
3rd clearest
Wind
9 km/h
9th windiest
Solar energy
3.33 kWh/m²
Travel score
5.8
out of 10

Trenčín is city in Slovakia.

Air quality
Elevated
PM2.5 17.7 µg/m³ · 2019
Density
711/km²
people per km²
Founded
1111

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 21°C in the first days to 16°C by the end.

A typical September day in Trenčín reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 24°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)
12112
22111
32111
42111
52011
62011
72011
82011
92010
102010
111910
121910
131910
141910
151910
161910
17189
18189
19189
20189
21189
22179
23179
24178
25178
26178
27178
28168
29168
30168

How September really feels in Trenčín

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.

Trenčín 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 / -4°4810.17.28.50.0
Feb / -3°459.66.19.80.0
Mar / 5310.73.511.61.3
Apr14° / 5410.1113.44.0
May18° / 8312.80155.6
Jun22° / 12°9013.2015.96.1
Jul24° / 14°10513.2015.56.5
Aug24° / 13°8111.3014.26.8
Sep19° / 10°7610.8012.45.8
Oct13° / 579.80.310.53.5
Nov / 5410.138.90.8
Dec / -3°5110.25.68.10.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% 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 53%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25248
35248
45149
55149
65050
74951
84852
94852
104753
114753
124654
134654
144654
154654
164654
174555
184555
194555
204555
214555
224555
234555
244456
254456
264456
274456
284357
294258
304258

Chance of precipitation in September

Any precipitation

Trenčín gets around 76 mm of rain over 10.8 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 36% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
238
338
438
538
638
738
838
938
1038
1138
1237
1337
1437
1536
1636
1736
1836
1935
2035
2135
2234
2334
2434
2533
2633
2733
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 81% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
163298
265287
367276
468266
570255
672244
772244
874233
974233
1075223
1176222
1277212
1378202
1480191
1581181
1682171
1783161
1884151
1986140
2087130
2188120
2289110
2390100
249190
259280
269280
279370
289370
299370
309460

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 5:10 AM to 5:52 AM, and sunset from 6:26 PM to 5:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:106:26
213.25:116:23
313.15:126:21
413.15:146:19
513.05:156:17
613.05:176:15
712.95:186:13
812.85:206:10
912.85:216:08
1012.75:236:06
1112.75:246:04
1212.65:266:02
1312.55:275:59
1412.55:295:57
1512.45:305:55
1612.45:325:53
1712.35:335:51
1812.25:345:48
1912.25:365:46
2012.15:375:44
2112.05:395:42
2212.05:405:39
2311.95:425:37
2411.95:435:35
2511.85:455:33
2611.75:465:31
2711.75:485:28
2811.65:495:26
2911.65:515:24
3011.55:525:22

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.33 kWh/m².

For context, solar energy here swings from a low near 0.76 kWh/m² to a high of 5.6 kWh/m² in June across the year — September's 3.33 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
133.5Moderate
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 Trenčín?

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

5.8
Sightseeing
4th-best month of the year
2.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Trenčín for sightseeing.

What to pack for Trenčín in September

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

In September, Trenčín sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear. About 11 days see rain.

rain gear

UV index in Trenčín in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Trenčín peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 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 11UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May6High
Jun7Very high
Jul8Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Trenčín 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 Trenčín is worst in June — around 22 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 13 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Trenčín's WHO annual average of 17.7 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 1722 µg/m³Dec 1513 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb15Moderate
Mar20Moderate
Apr20Moderate
May21Moderate
Jun22Moderate
Jul21Moderate
Aug20Moderate
Sep17Moderate
Oct15Moderate
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Trenčín?

Trenčín sits at 48.9°N, 18.0°E, 217 m above sea level, in Slovakia. The nearest listed city is Dubnica nad Váhom, 11 km away.

Bánovce nad BebravouUherský BrodPúchovPiešťanyPovažská BystricaTopoľčany

Topography around Trenčín

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

Within 3 km, the terrain around Trenčín has only modest variations in elevation — a maximum elevation change of 208 m around an average of 241 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 865 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,529 m.

The land around Trenčín is covered by trees (37%), artificial surfaces (30%) and cropland (20%) within 3 km, trees (63%) within 16 km, and trees (53%) and cropland (31%) within 80 km.

3 km
208 m
16 km
865 m
80 km
1,529 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Dubnica nad Váhom 11 km · Nové Mesto nad Váhom 22 km · Bánovce nad Bebravou 25 km · Uherský Brod 32 km · Púchov 33 km · Piešťany 37 km · Považská Bystrica 37 km · Topoľčany 38 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 Trenčín (48.8945°, 18.0444°, elevation 217 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).