Sisak weather in September

In September, Sisak sees average daytime highs of 23°C and overnight lows near 13°C, with 90 mm of rain across 9.8 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 21°C by the end. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Sisak's 4th-clearest and 9th-windiest month. For the whole year in context, see Sisak's year-round climate.

Daytime high
23°
4th warmest
Overnight low
13°
9th coldest
Rainfall
90 mm
9.8 wet days
Daylight
12 h 18 min
5:39 AM – 5:58 PM
Cloud cover
54%
4th clearest
Wind
7 km/h
9th windiest
Solar energy
3.73 kWh/m²
Travel score
6.8
out of 10
Air quality
Good
PM10 29.8 µg/m³ · 2019

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 25°C in the first days to 21°C by the end.

A typical September day in Sisak reaches about 23°C in the afternoon and slips back to 13°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 29°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)
12615
22615
32515
42514
52514
62514
72514
82414
92414
102414
112413
122413
132413
142313
152313
162313
172313
182312
192312
202212
212212
222212
232212
242212
252211
262111
272111
282111
292111
302111

How September really feels in Sisak

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.

Sisak weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°558.53.98.90.1
Feb / -1°578.83.510.11.3
Mar13° / 629.91.811.63.8
Apr18° / 6910.90.313.25.6
May23° / 12°8512.3014.76.5
Jun27° / 16°7710.8015.46.5
Jul29° / 17°719.3015.15.9
Aug29° / 17°738.6013.96.2
Sep23° / 13°909.8012.36.8
Oct18° / 768.7010.75.8
Nov11° / 799.31.49.32.8
Dec / -0°689.82.68.60.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% 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 45%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16040
25941
35941
45842
55842
65842
75743
85743
95743
105644
115545
125545
135545
145545
155347
165347
175347
185347
195248
205248
215248
225248
235248
245347
255248
265347
275347
285248
295248
305248

Chance of precipitation in September

Any precipitation

Sisak gets around 90 mm of rain over 9.8 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
232
332
433
533
634
734
834
935
1035
1135
1235
1334
1434
1534
1634
1733
1833
1933
2032
2132
2231
2331
2431
2530
2630
2730
2830
2930
3030

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 48% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13036304
23236293
33337283
43437262
53438252
63539252
73639241
83640231
93740221
103840221
113940210
124040200
134239190
144339180
154538170
164737160
174937150
185036140
195235130
205434120
215732110
225931100
23613090
24613090
25632980
26642970
27642970
28662860
29662860
30672850

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 06 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 96 minutes over September. Sunrise moves from 5:21 AM to 5:57 AM, and sunset from 6:28 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:216:28
213.15:226:26
313.05:236:24
413.05:246:22
512.95:266:20
612.95:276:18
712.85:286:16
812.75:296:14
912.75:316:12
1012.65:326:10
1112.65:336:08
1212.55:346:06
1312.55:366:04
1412.45:376:02
1512.45:386:00
1612.35:395:58
1712.35:415:56
1812.25:425:54
1912.25:435:52
2012.15:445:50
2112.05:465:48
2212.05:475:46
2311.95:485:44
2411.95:505:42
2511.85:515:40
2611.85:525:38
2711.75:535:36
2811.75:555:34
2911.65:565:32
3011.55:575:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.73 kWh/m².

For context, solar energy here swings from a low near 1.08 kWh/m² to a high of 6.01 kWh/m² in July across the year — September's 3.73 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.4Bright
34.3Bright
44.3Bright
54.2Bright
64.2Bright
74.1Bright
84.1Bright
94.0Bright
104.0Moderate
113.9Moderate
123.9Moderate
133.8Moderate
143.8Moderate
153.8Moderate
163.7Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.5Moderate
213.5Moderate
223.4Moderate
233.4Moderate
243.4Moderate
253.3Moderate
263.3Moderate
273.3Moderate
283.2Moderate
293.2Moderate
303.1Moderate
Planning a trip in September

Is September a good time to visit Sisak?

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
5.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sisak for sightseeing.

What to pack for Sisak in September

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

In September, Sisak sees daytime highs around 23°C and nights near 13°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

UV index in Sisak 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 Sisak peaks around July 14 at about 8 (very high) — sunscreen, a hat and midday shade are essential. 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 14UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr7High
May6High
Jun8Very high
Jul8Very high
Aug7Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

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

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2317 µg/m³Sep 1912 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb15Moderate
Mar17Moderate
Apr17Moderate
May16Moderate
Jun15Moderate
Jul14Moderate
Aug14Moderate
Sep12Moderate
Oct13Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Sisak?

Sisak sits at 45.5°N, 16.4°E, 108 m above sea level, in Croatia. The nearest listed city is Velika Gorica, 36 km away.

Velika GoricaSesveteCentarZagrebVelika KladušaPrijedorBjelovarZaprešić

Topography around Sisak

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

Within 3 km, the terrain around Sisak has only modest variations in elevation — a maximum elevation change of 43 m around an average of 102 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 334 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,248 m.

The land around Sisak is covered by trees (39%) within 3 km, trees (60%) within 16 km, and trees (68%) within 80 km.

3 km
43 m
16 km
334 m
80 km
1,248 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Velika Gorica 36 km · Sesvete 45 km · Centar 50 km · Zagreb 50 km · Velika Kladuša 55 km · Prijedor 60 km · Bjelovar 60 km · Zaprešić 62 km

Croatia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 53% of US
price level, 2025
GDP per capita
$27,104
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
87%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
7.9
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 617
Religion
Roman Catholic 79%other Christian 5%none or atheist 5%Orthodox 3%

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 Sisak (45.4661°, 16.3775°, elevation 108 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).