Olomouc weather in September

In September, Olomouc sees average daytime highs of 19°C and overnight lows near 10°C, with 67 mm of rain across 9.8 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 17°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 Olomouc's 4th-clearest and 9th-windiest month. For the whole year in context, see Olomouc's year-round climate.

Daytime high
19°
4th warmest
Overnight low
10°
9th coldest
Rainfall
67 mm
9.8 wet days
Daylight
12 h 24 min
5:34 AM – 5:56 PM
Cloud cover
60%
4th clearest
Wind
11 km/h
9th windiest
Solar energy
3.25 kWh/m²
Travel score
6.0
out of 10

Olomouc is city in Czechia.

Air quality
Elevated
PM2.5 17.8 µg/m³ · 2019
Density
963/km²
people per km²
Founded
1017

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 17°C by the end.

A typical September day in Olomouc 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)
12212
22112
32112
42112
52111
62111
72111
82011
92011
102011
112011
122010
131910
141910
151910
161910
171910
181910
19189
20189
21189
22189
23189
24179
25179
26178
27178
28178
29178
30168

How September really feels in Olomouc

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.

Olomouc 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°348.85.58.40.0
Feb / -3°307.649.80.0
Mar / 429.42.411.51.4
Apr14° / 428.80.613.44.2
May19° / 7112.7015.15.7
Jun22° / 12°8212.20166.2
Jul24° / 14°9212.9015.66.5
Aug24° / 14°7110.7014.26.8
Sep19° / 10°679.8012.46.0
Oct13° / 488.80.310.53.6
Nov / 438.728.90.9
Dec / -2°398.84.380.0

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 56%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
24951
34951
44951
54852
64852
74654
84654
94654
104654
114555
124555
134555
144456
154456
164357
174357
184357
194357
204357
214357
224357
234357
244258
254357
264258
274258
284159
294159
304060

Chance of precipitation in September

Any precipitation

Olomouc gets around 67 mm of rain over 9.8 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 33% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
134
235
335
435
535
635
735
835
935
1035
1134
1234
1333
1433
1533
1632
1732
1832
1931
2031
2131
2230
2330
2430
2530
2630
2730
2831
2931
3031

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 84% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
169256
271245
372244
473234
574233
675223
776222
877212
977212
1079201
1179201
1280191
1381181
1482171
1583161
1684151
1786140
1887130
1988120
2089110
2190100
229190
239280
249280
259370
269370
279460
289460
299460
309460

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 5:12 AM to 5:56 AM, and sunset from 6:30 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:126:30
213.25:136:27
313.25:156:25
413.15:166:23
513.15:186:21
613.05:196:19
712.95:216:16
812.95:226:14
912.85:246:12
1012.75:256:10
1112.75:276:08
1212.65:286:05
1312.65:306:03
1412.55:316:01
1512.45:335:58
1612.45:345:56
1712.35:365:54
1812.25:375:52
1912.25:395:49
2012.15:415:47
2112.05:425:45
2212.05:445:43
2311.95:455:40
2411.95:475:38
2511.85:485:36
2611.75:505:34
2711.75:515:31
2811.65:535:29
2911.55:545:27
3011.55:565:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.25 kWh/m².

For context, solar energy here swings from a low near 0.73 kWh/m² to a high of 5.5 kWh/m² in June across the year — September's 3.25 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.8Moderate
43.8Moderate
53.7Moderate
63.7Moderate
73.6Moderate
83.6Moderate
93.6Moderate
103.5Moderate
113.5Moderate
123.4Moderate
133.4Moderate
143.3Moderate
153.3Moderate
163.3Moderate
173.2Moderate
183.2Moderate
193.1Moderate
203.1Moderate
213.0Moderate
223.0Moderate
232.9Moderate
242.9Moderate
252.8Moderate
262.8Moderate
272.7Moderate
282.7Moderate
292.6Moderate
302.6Moderate
Planning a trip in September

Is September a good time to visit Olomouc?

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

6.0
Sightseeing
4th-best month of the year
2.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Olomouc for sightseeing.

What to pack for Olomouc in September

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

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

rain gear

UV index in Olomouc 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 Olomouc peaks around June 22 at about 7 (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 highHighModerateLowJun 22UV 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May6High
Jun7Very high
Jul7Very high
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Olomouc 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 Olomouc is worst in June — around 21 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Olomouc's WHO annual average of 17.8 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 1621 µg/m³Dec 1114 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb16Moderate
Mar21Moderate
Apr20Moderate
May20Moderate
Jun21Moderate
Jul20Moderate
Aug20Moderate
Sep18Moderate
Oct15Moderate
Nov14Moderate
Dec14Moderate
Location & terrain

Where is Olomouc?

Olomouc sits at 49.6°N, 17.3°E, 223 m above sea level, in Czechia. The nearest listed city is Prostějov, 17 km away.

KroměřížHraniceVyškovŠumperkBruntálOtrokovice

Topography around Olomouc

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

Within 3 km, the terrain around Olomouc has only modest variations in elevation — a maximum elevation change of 62 m around an average of 221 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 451 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,324 m.

The land around Olomouc is covered by artificial surfaces (47%) and trees (23%) within 3 km, cropland (61%) and trees (23%) within 16 km, and trees (44%) and cropland (36%) within 80 km.

3 km
62 m
16 km
451 m
80 km
1,324 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Prostějov 17 km · Přerov 21 km · Kroměříž 35 km · Hranice 35 km · Vyškov 40 km · Šumperk 46 km · Bruntál 46 km · Otrokovice 48 km

Czechia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 59% of US
price level, 2025
GDP per capita
$35,917
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
5.9
per 100k/yr, 2019
Income group
High
World Bank
English
High
EF EPI 582
Religion
none 48%believers unaffiliated with a religious society 9%Roman Catholic 7%other believers belonging to a church or religious society 6%

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 Olomouc (49.5955°, 17.2518°, elevation 223 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).