Gemlik weather in September

In September, Gemlik sees average daytime highs of 25°C and overnight lows near 17°C, with 54 mm of rain across 6.8 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-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 62% of the time in September, and the air most often feels humid.

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 Gemlik's 4th-clearest and 3rd-windiest month. For the whole year in context, see Gemlik's year-round climate.

Daytime high
25°
4th warmest
Overnight low
17°
9th coldest
Rainfall
54 mm
6.8 wet days
Daylight
12 h 18 min
5:50 AM – 6:06 PM
Cloud cover
33%
4th clearest
Wind
8 km/h
3rd windiest
Solar energy
4.55 kWh/m²
Travel score
7.8
out of 10

Gemlik is district and town in Bursa Province, Turkey.

Density
189/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 Gemlik reaches about 25°C in the afternoon and slips back to 17°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
62718
72718
82617
92617
102617
112617
122617
132617
142617
152617
162517
172517
182517
192516
202516
212516
222416
232416
242416
252416
262416
272415
282415
292315
302315

How September really feels in Gemlik

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.

Gemlik weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 9012.74.79.41.5
Feb10° / 79124.310.42.0
Mar13° / 8612.12.211.73.2
Apr17° / 6510.20.3135.4
May22° / 13°538.2014.27.1
Jun26° / 17°497.8014.87.5
Jul29° / 19°264.6014.67.0
Aug29° / 20°284.2013.66.8
Sep25° / 17°546.8012.37.8
Oct20° / 13°779.2010.96.7
Nov15° / 759.60.89.84.6
Dec10° / 9712.43.29.22.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% 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 (%)
18812
28812
38812
48614
58614
68614
78515
88515
98515
108416
118416
128317
138218
148119
158119
168020
177822
187822
197624
207624
217426
227426
237228
247228
257228
267030
277030
287030
297030
306832

Chance of precipitation in September

Any precipitation

Gemlik gets around 54 mm of rain over 6.8 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 22% and peaks near 27% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
118
218
318
418
518
618
718
818
918
1018
1118
1218
1319
1419
1520
1621
1721
1822
1923
2024
2125
2225
2326
2427
2527
2627
2727
2827
2927
3027

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid 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 (%)
192839241
2102938221
3113038211
4123138190
5133238170
6143238160
7153338140
8163338130
9163438110
10173439100
1117343990
1218344080
1318354070
1419354060
1519354060
1620354050
1720363950
1821363950
1921363850
2022373740
2123373640
2224373540
2325383330
2427383230
2528383130
2629383030
2730392920
2831392820
2932392720
3033392620

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:35 AM to 6:04 AM, and sunset from 6:31 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:356:31
212.95:366:30
312.95:376:28
412.85:386:26
512.85:396:25
612.75:406:23
712.75:416:21
812.65:426:19
912.65:436:18
1012.55:446:16
1112.55:456:14
1212.45:466:13
1312.45:476:11
1412.45:486:09
1512.35:496:07
1612.35:506:06
1712.25:516:04
1812.25:526:02
1912.15:536:00
2012.15:545:59
2112.05:555:57
2212.05:565:55
2311.95:575:53
2411.95:585:52
2511.95:595:50
2611.86:005:48
2711.86:015:46
2811.76:025:45
2911.76:035:43
3011.66:045:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.55 kWh/m².

For context, solar energy here swings from a low near 1.51 kWh/m² to a high of 6.81 kWh/m² in July across the year — September's 4.55 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.2Bright
45.2Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
94.9Bright
104.9Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.6Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.1Bright
254.0Bright
264.0Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Gemlik?

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
7.1
Beach & pool
4th-best month of the year

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

What to pack for Gemlik in September

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

In September, Gemlik sees daytime highs around 25°C and nights near 17°C. Worth packing: light clothes and sun protection. About 7 days see rain.

light clothessun protection

Sea temperature near Gemlik 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 22 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 Gemlik 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 Gemlik peaks around August 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateVery highModerateLowAug 10UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr7Very high
May7Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep7High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Gemlik 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 Gemlik 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 Gemlik?

Gemlik sits at 40.4°N, 29.2°E, 5 m above sea level, in Turkey. The nearest listed city is Orhangazi, 14 km away.

Topography around Gemlik

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

Within 3 km, the terrain around Gemlik has large variations in elevation — a maximum elevation change of 729 m around an average of 141 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,282 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,553 m.

The land around Gemlik is covered by trees (49%) and artificial surfaces (21%) within 3 km, trees (65%) within 16 km, and trees (47%) and water (27%) within 80 km.

3 km
729 m
16 km
1,282 m
80 km
2,553 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Orhangazi 14 km · Gürsu 24 km · Mudanya 24 km · Kestel 26 km · Yalova 27 km · Bursa 27 km · Nilüfer 32 km · Görükle 35 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 Gemlik (40.4309°, 29.1597°, elevation 5 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).