Osmaneli weather in September

In September, Osmaneli sees average daytime highs of 27°C and overnight lows near 14°C, with 24 mm of rain across 5 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 25°C by the end. The sky is clear or mostly clear about 62% of the time in September, and the air most often feels dry.

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 Osmaneli's 3rd-clearest and 9th-windiest month. For the whole year in context, see Osmaneli's year-round climate.

Daytime high
27°
4th warmest
Overnight low
14°
9th coldest
Rainfall
24 mm
5 wet days
Daylight
12 h 18 min
5:46 AM – 6:02 PM
Cloud cover
33%
3rd clearest
Wind
6 km/h
9th windiest
Solar energy
4.72 kWh/m²
Travel score
7.7
out of 10

Osmaneli is district and town of Bilecik, Turkey.

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 28°C in the first days to 25°C by the end.

A typical September day in Osmaneli reaches about 27°C in the afternoon and slips back to 14°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 32°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12916
22916
32815
42815
52815
62815
72815
82815
92815
102714
112714
122714
132714
142714
152714
162714
172614
182614
192614
202613
212613
222613
232513
242513
252513
262513
272512
282512
292512
302412

How September really feels in Osmaneli

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.

Osmaneli weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -0°5810.35.49.51.0
Feb / 5310.24.610.41.9
Mar13° / 6411.22.911.73.4
Apr18° / 5610.50.6135.7
May23° / 11°499.4014.27.1
Jun27° / 15°387.7014.87.1
Jul30° / 17°153.8014.66.3
Aug30° / 18°133.2013.66.1
Sep27° / 14°245012.37.7
Oct21° / 10°447.1010.97.1
Nov15° / 447.81.19.84.7
Dec / 6210.33.89.21.8

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 (%)
18713
28614
38614
48515
58416
68416
78416
88416
98317
108317
118218
128119
138119
148020
157921
167921
177822
187822
197723
207723
217525
227525
237525
247327
257327
267228
277228
287129
297129
307129

Chance of precipitation in September

Any precipitation

Osmaneli gets around 24 mm of rain over 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 16% and peaks near 20% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
114
214
314
414
514
614
714
814
914
1014
1114
1214
1314
1414
1515
1615
1715
1816
1916
2017
2118
2218
2319
2419
2520
2620
2720
2820
2920
3020

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 55% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13339262
23538242
33738232
44037221
54236211
64336201
74536191
84635181
94835171
104935161
115035150
125135140
135235130
145235130
155434120
165534110
175534110
185733100
195832100
20593290
21613180
22633070
23652960
24672760
25692650
26712540
27722440
28742330
29752230
30762130

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 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
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:32 AM to 6:01 AM, and sunset from 6:28 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:326:28
212.95:336:26
312.85:346:24
412.85:356:23
512.85:356:21
612.75:366:19
712.75:376:18
812.65:386:16
912.65:396:14
1012.55:406:13
1112.55:416:11
1212.45:426:09
1312.45:436:07
1412.45:446:06
1512.35:456:04
1612.35:466:02
1712.25:476:00
1812.25:485:59
1912.15:495:57
2012.15:505:55
2112.05:515:53
2212.05:525:52
2311.95:535:50
2411.95:545:48
2511.95:555:47
2611.85:565:45
2711.85:575:43
2811.75:585:41
2911.76:005:40
3011.66:015:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.72 kWh/m².

For context, solar energy here swings from a low near 1.63 kWh/m² to a high of 6.89 kWh/m² in July across the year — September's 4.72 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.4Bright
35.4Bright
45.3Bright
55.3Bright
65.2Bright
75.2Bright
85.1Bright
95.1Bright
105.0Bright
115.0Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.7Bright
174.7Bright
184.6Bright
194.5Bright
204.5Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.2Bright
264.2Bright
274.1Bright
284.1Bright
294.0Bright
304.0Moderate
Planning a trip in September

Is September a good time to visit Osmaneli?

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

7.7
Sightseeing
1st-best month of the year
7.7
Beach & pool
3rd-best month of the year

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

What to pack for Osmaneli in September

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

In September, Osmaneli sees daytime highs around 27°C and nights near 14°C. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

UV index in Osmaneli 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 Osmaneli peaks around August 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 20UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar3Moderate
Apr7High
May7Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep7High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Osmaneli 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 Osmaneli is worst in March — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMar 2316 µg/m³Dec 198 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar16Moderate
Apr16Moderate
May15Moderate
Jun13Moderate
Jul10Good
Aug10Good
Sep10Good
Oct10Good
Nov10Good
Dec8Good
Location & terrain

Where is Osmaneli?

Osmaneli sits at 40.4°N, 30.0°E, 114 m above sea level, in Turkey. The nearest listed city is Bilecik, 24 km away.

Topography around Osmaneli

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

Within 3 km, the terrain around Osmaneli has significant variations in elevation — a maximum elevation change of 586 m around an average of 225 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,042 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,526 m.

The land around Osmaneli is covered by trees (53%) and cropland (21%) within 3 km, trees (63%) and cropland (21%) within 16 km, and trees (58%) within 80 km.

3 km
586 m
16 km
1,042 m
80 km
2,526 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Bilecik 24 km · İznik 26 km · Geyve 29 km · Yenişehir 32 km · Sapanca 43 km · Gölcük 43 km · İzmit 46 km · Derince 48 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 Osmaneli (40.3572°, 30.0142°, elevation 114 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).