Karamürsel weather in September

In September, Karamürsel sees average daytime highs of 26°C and overnight lows near 16°C, with 45 mm of rain across 6.5 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 24°C by the end. The sky is clear or mostly clear about 61% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Karamürsel's 4th-clearest and 3rd-windiest month. For the whole year in context, see Karamürsel's year-round climate.

Daytime high
26°
4th warmest
Overnight low
16°
9th coldest
Rainfall
45 mm
6.5 wet days
Daylight
12 h 18 min
5:48 AM – 6:04 PM
Cloud cover
34%
4th clearest
Wind
10 km/h
3rd windiest
Solar energy
4.49 kWh/m²
Travel score
7.8
out of 10

Karamürsel is district of Kocaeli, northwestern Turkey.

Density
117/km²
people per km²

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 27°C in the first days to 24°C by the end.

A typical September day in Karamürsel reaches about 26°C in the afternoon and slips back to 16°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 30°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12818
22718
32718
42718
52718
62717
72717
82717
92617
102617
112617
122617
132617
142617
152616
162616
172516
182516
192516
202516
212516
222516
232416
242415
252415
262415
272415
282415
292415
302315

How September really feels in Karamürsel

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.

Karamürsel weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 8011.84.59.41.4
Feb10° / 6610.93.710.42.0
Mar12° / 7611.3211.73.2
Apr17° / 5490.213.15.6
May22° / 12°447.4014.27.3
Jun26° / 17°477.1014.97.5
Jul29° / 19°294.4014.66.8
Aug29° / 20°274.1013.66.7
Sep26° / 16°456.5012.37.8
Oct20° / 13°628.9010.96.7
Nov15° / 628.80.49.74.7
Dec10° / 8711.62.69.12.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 61% 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 21%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18911
28812
38713
48713
58713
68713
78713
88515
98515
108515
118416
128416
138317
148218
158119
168020
177921
187723
197723
207525
217525
227327
237228
247129
257129
266931
276931
286931
296832
306733

Chance of precipitation in September

Any precipitation

Karamürsel gets around 45 mm of rain over 6.5 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 21% and peaks near 26% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
117
217
317
417
517
617
717
817
917
1017
1117
1217
1318
1418
1519
1619
1720
1821
1922
2023
2124
2224
2325
2426
2526
2626
2726
2826
2926
3026

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the comfortable band about 36% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
182740251
292839231
3102939210
4113139190
5123239170
6133338150
7143439140
8153439120
9153539110
10163639100
1116363990
1216364080
1317374070
1417373960
1518373960
1618383960
1719383850
1819383750
1920383650
2021393650
2122393440
2224393340
2325393240
2426393130
2528402930
2629402830
2731402730
2832402620
2933402520
3034402420

Wind in September

Winds average 10 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
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:33 AM to 6:02 AM, and sunset from 6:30 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:336:30
212.95:346:28
312.95:356:26
412.85:366:25
512.85:376:23
612.75:386:21
712.75:396:20
812.65:406:18
912.65:416:16
1012.55:426:14
1112.55:436:13
1212.45:446:11
1312.45:456:09
1412.45:466:07
1512.35:476:06
1612.35:486:04
1712.25:496:02
1812.25:506:00
1912.15:515:59
2012.15:525:57
2112.05:535:55
2212.05:545:53
2311.95:555:52
2411.95:565:50
2511.85:575:48
2611.85:585:46
2711.85:595:45
2811.76:005:43
2911.76:015:41
3011.66:025:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.49 kWh/m².

For context, solar energy here swings from a low near 1.48 kWh/m² to a high of 6.76 kWh/m² in July across the year — September's 4.49 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.6Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.1Bright
244.0Bright
254.0Bright
263.9Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Karamürsel?

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

7.8
Sightseeing
1st-best month of the year
7.2
Beach & pool
4th-best month of the year

September is one of the better times to visit Karamürsel for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Karamürsel in September

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

In September, Karamürsel sees daytime highs around 26°C and nights near 16°C. Worth packing: light clothes. About 7 days see rain.

light clothes

Sea temperature near Karamürsel in September

The nearest coast averages about 22°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 42 km away) is warmest in August at about 24°C and coldest in February near 8°C.

It's comfortable for a long swim from Jun 12 to Oct 6 — about 3.8 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan9Bracing
Feb8Bracing
Mar9Bracing
Apr11Bracing
May16Cool
Jun21Refreshing
Jul23Refreshing
Aug24Warm
Sep22Refreshing
Oct19Cool
Nov15Cool
Dec12Bracing

UV index in Karamürsel in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Karamürsel peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highModerateLowJun 23UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr7High
May7High
Jun9Very high
Jul9Very high
Aug9Very high
Sep7High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Karamürsel 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 Karamürsel is worst in March — around 18 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 10 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMar 2317 µg/m³Dec 1810 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar18Moderate
Apr17Moderate
May17Moderate
Jun13Moderate
Jul11Good
Aug11Good
Sep10Good
Oct11Good
Nov12Good
Dec10Good
Location & terrain

Where is Karamürsel?

Karamürsel sits at 40.7°N, 29.6°E, 17 m above sea level, in Turkey. The nearest listed city is Körfez, 16 km away.

Topography around Karamürsel

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

Within 3 km, the terrain around Karamürsel has significant variations in elevation — a maximum elevation change of 478 m around an average of 111 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,136 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,536 m.

The land around Karamürsel is covered by water (45%) and trees (41%) within 3 km, trees (50%) and water (27%) within 16 km, and trees (48%) and water (26%) within 80 km.

3 km
478 m
16 km
1,136 m
80 km
2,536 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Körfez 16 km · Gölcük 17 km · Derince 18 km · Gebze 20 km · İzmit 28 km · Yalova 29 km · İznik 31 km · Orhangazi 34 km

Turkey travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$18,599
2025
Happiness
5.3 / 10
World Happiness, 2025
Homicide rate
3.2
per 100k, 2023
Road deaths
6.7
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 488
Religion
Muslim 100%other 0%

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 Karamürsel (40.6913°, 29.6165°, elevation 17 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).