Senec weather in September

In September, Senec sees average daytime highs of 22°C and overnight lows near 12°C, with 64 mm of rain across 8.6 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 24°C in the first days to 19°C by the end. The sky is clear or mostly clear about 34% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Senec's 3rd-clearest and 9th-windiest month. For the whole year in context, see Senec's year-round climate.

Daytime high
22°
4th warmest
Overnight low
12°
9th coldest
Rainfall
64 mm
8.6 wet days
Daylight
12 h 18 min
5:34 AM – 5:55 PM
Cloud cover
56%
3rd clearest
Wind
12 km/h
9th windiest
Solar energy
3.54 kWh/m²
Travel score
6.8
out of 10

Senec is town in Slovakia.

Density
520/km²
people per km²
Founded
1251

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 Senec reaches about 22°C in the afternoon and slips back to 12°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 16°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)
12414
22414
32414
42414
52313
62313
72313
82313
92313
102313
112213
122212
132212
142212
152212
162112
172112
182111
192111
202111
212111
222011
232011
242011
252010
262010
271910
281910
291910
301910

How September really feels in Senec

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.

Senec 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 / -3°3683.98.60.0
Feb / -1°337.93.29.90.3
Mar11° / 408.41.611.62.6
Apr17° / 4280.313.45.4
May21° / 11°6710.7014.96.4
Jun25° / 14°7210.8015.86.7
Jul27° / 16°7411015.56.4
Aug27° / 16°649.4014.16.7
Sep22° / 12°648.6012.46.8
Oct15° / 488.60.110.64.8
Nov / 478.81.691.7
Dec / -1°418.72.98.20.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25743
35644
45644
55446
65446
75347
85347
95149
105149
115149
125149
135050
144951
154951
164951
174951
184852
194852
204852
214951
224951
234951
244951
254951
264951
274951
284753
294852
304753

Chance of precipitation in September

Any precipitation

Senec gets around 64 mm of rain over 8.6 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 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
131
231
331
431
530
630
730
830
930
1030
1129
1229
1329
1429
1529
1629
1729
1829
1929
2028
2128
2228
2328
2428
2528
2628
2728
2828
2929
3029

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 75% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15829121
26128110
36128110
46327100
5642790
6642790
7652780
8662770
9662770
10682660
11682660
12702550
13722440
14732340
15742240
16762130
17772030
18781930
19801730
20821620
21831520
22841420
23851320
24871210
25881110
26881110
27881110
28881110
29881110
30881110

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 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 102 minutes over September. Sunrise moves from 5:13 AM to 5:55 AM, and sunset from 6:27 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:136:27
213.25:146:25
313.15:166:23
413.15:176:21
513.05:196:19
612.95:206:17
712.95:226:15
812.85:236:12
912.85:246:10
1012.75:266:08
1112.65:276:06
1212.65:296:04
1312.55:306:02
1412.55:315:59
1512.45:335:57
1612.35:345:55
1712.35:365:53
1812.25:375:51
1912.25:395:49
2012.15:405:46
2112.05:425:44
2212.05:435:42
2311.95:445:40
2411.95:465:38
2511.85:475:36
2611.75:495:33
2711.75:505:31
2811.65:525:29
2911.65:535:27
3011.55:555:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.54 kWh/m².

For context, solar energy here swings from a low near 0.87 kWh/m² to a high of 5.87 kWh/m² in June across the year — September's 3.54 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.1Bright
44.1Bright
54.0Bright
64.0Moderate
73.9Moderate
83.9Moderate
93.8Moderate
103.8Moderate
113.8Moderate
123.7Moderate
133.7Moderate
143.6Moderate
153.6Moderate
163.5Moderate
173.5Moderate
183.4Moderate
193.4Moderate
203.3Moderate
213.3Moderate
223.3Moderate
233.2Moderate
243.2Moderate
253.1Moderate
263.1Moderate
273.0Moderate
283.0Moderate
292.9Moderate
302.9Moderate
Planning a trip in September

Is September a good time to visit Senec?

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

6.8
Sightseeing
1st-best month of the year
4.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Senec for sightseeing.

What to pack for Senec in September

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

In September, Senec sees daytime highs around 22°C and nights near 12°C. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Senec 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 Senec 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
Apr6High
May6High
Jun7Very high
Jul8Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Senec 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 Senec is worst in June — around 17 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJun 1516 µg/m³Dec 1411 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar16Moderate
Apr16Moderate
May16Moderate
Jun17Moderate
Jul15Moderate
Aug15Moderate
Sep13Moderate
Oct12Moderate
Nov12Good
Dec11Good
Location & terrain

Where is Senec?

Senec sits at 48.2°N, 17.4°E, 127 m above sea level, in Slovakia. The nearest listed city is Pezinok, 13 km away.

Staré MestoGalanta

Topography around Senec

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

Within 3 km, the terrain around Senec has only modest variations in elevation — a maximum elevation change of 50 m around an average of 129 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 289 m; within 80 km, large variations in elevation — a maximum elevation change of 951 m.

The land around Senec is covered by cropland (56%) and artificial surfaces (20%) within 3 km, cropland (68%) within 16 km, and cropland (57%) and trees (25%) within 80 km.

3 km
50 m
16 km
289 m
80 km
951 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Pezinok 13 km · Vrakuňa 17 km · Podunajské Biskupice 17 km · Trnava 22 km · Petržalka 23 km · Bratislava 23 km · Staré Mesto 24 km · Galanta 24 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 Senec (48.2195°, 17.4004°, elevation 127 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).