İznik weather in May

In May, İznik sees average daytime highs of 22°C and overnight lows near 11°C, with 56 mm of rain across 9.2 wet days and about 14.2 hours of daylight. It is the 5th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 24°C by the end. The sky is clear or mostly clear about 44% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 42 min at the start of May to 14 h 36 min by month's end. Set against the rest of the year, May is İznik's 5th-clearest and 11th-windiest month. For the whole year in context, see İznik's year-round climate.

Daytime high
22°
5th warmest
Overnight low
11°
8th coldest
Rainfall
56 mm
9.2 wet days
Daylight
14 h 12 min
4:50 AM – 7:04 PM
Cloud cover
48%
5th clearest
Wind
6 km/h
11th windiest
Solar energy
6.01 kWh/m²
Travel score
7.0
out of 10

İznik is district and town in the Province of Bursa, Turkey.

Density
30/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 24°C by the end.

A typical May day in İznik reaches about 22°C in the afternoon and slips back to 11°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 28°C. Set against its neighbours, May runs about 5°C warmer than April and about 4°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
1209
2209
3209
4209
52010
62110
72110
82110
92110
102110
112211
122211
132211
142211
152211
162211
172312
182312
192312
202312
212312
222312
232312
242313
252313
262413
272413
282413
292413
302413
312413

How May really feels in İznik

Once humidity and wind are folded in, May 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

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

İznik weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 7411.75.99.41.1
Feb / 6311.15.110.41.8
Mar12° / 7512.43.211.73.2
Apr17° / 6010.50.5135.5
May22° / 11°569.2014.27.0
Jun26° / 15°579.4014.87.1
Jul29° / 18°284.9014.66.6
Aug29° / 18°254.2013.66.5
Sep26° / 15°406.8012.37.7
Oct21° / 11°578.6010.96.7
Nov15° / 578.61.19.84.5
Dec / 7811.949.21.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 17% of May, with mostly cloudy or overcast conditions the remaining 39%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25644
35644
45743
55842
65842
75842
85941
95941
106040
116139
126139
136139
146238
156238
166238
176238
186238
196238
206238
216238
226238
236238
246337
256337
266535
276535
286634
296634
306733
316931

Chance of precipitation in May

Any precipitation

İznik gets around 56 mm of rain over 9.2 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 29% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
127
227
327
427
527
627
727
827
927
1027
1127
1228
1328
1428
1528
1629
1729
1829
1930
2030
2130
2231
2331
2432
2532
2632
2732
2833
2933
3033
3133

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 71% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19370
29370
39280
49190
589110
688120
787130
886140
984160
1083170
1181190
1280200
1377221
1475241
1574251
1672271
1770291
1868302
1966322
2065332
2162353
2261363
2359383
2457394
2556404
2654415
2753425
2851436
2950437
3048448
3146459

Wind in May

Winds average 6 km/h in May.

Across May, 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.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 42 min at the start of May to 14 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over May. Sunrise moves from 5:07 AM to 4:39 AM, and sunset from 6:49 PM to 7:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:076:49
213.75:066:50
313.85:056:51
413.85:046:52
513.95:026:53
613.95:016:54
713.95:006:55
814.04:596:56
914.04:586:58
1014.04:566:59
1114.14:557:00
1214.14:547:01
1314.14:537:02
1414.24:527:03
1514.24:517:04
1614.24:507:04
1714.34:497:05
1814.34:487:06
1914.34:477:07
2014.44:477:08
2114.44:467:09
2214.44:457:10
2314.44:447:11
2414.54:447:12
2514.54:437:13
2614.54:427:14
2714.64:417:15
2814.64:417:15
2914.64:407:16
3014.64:407:17
3114.64:397:18

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.01 kWh/m².

For context, solar energy here swings from a low near 1.55 kWh/m² to a high of 6.77 kWh/m² in July across the year — May's 6.01 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.7Bright
35.7Bright
45.7Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.9Bright
105.9Bright
115.9Bright
126.0Bright
136.0Bright
146.0Intense
156.0Intense
166.1Intense
176.1Intense
186.1Intense
196.1Intense
206.1Intense
216.1Intense
226.2Intense
236.2Intense
246.2Intense
256.2Intense
266.2Intense
276.2Intense
286.2Intense
296.3Intense
306.3Intense
316.3Intense
Planning a trip in May

Is May a good time to visit İznik?

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

7.0
Sightseeing
3rd-best month of the year
4.9
Beach & pool
5th-best month of the year

May is one of the better times to visit İznik for general sightseeing.

What to pack for İznik in May

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

In May, İznik sees daytime highs around 22°C and nights near 11°C. Pack sun protection. Worth having: light clothes and rain gear. About 9 days see rain.

sun protectionlight clothesrain gear

Sea temperature near İznik in May

The nearest coast averages about 16°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 55 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 İznik in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 İznik 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 İznik in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in İznik 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 İznik?

İznik sits at 40.4°N, 29.7°E, 99 m above sea level, in Turkey. The nearest listed city is Yenişehir, 19 km away.

Topography around İznik

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

Within 3 km, the terrain around İznik has significant variations in elevation — a maximum elevation change of 319 m around an average of 114 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,174 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,527 m.

The land around İznik is covered by trees (40%) and water (28%) within 3 km, trees (54%) within 16 km, and trees (57%) within 80 km.

3 km
319 m
16 km
1,174 m
80 km
2,527 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
May weather nearby: Yenişehir 19 km · Osmaneli 26 km · Karamürsel 31 km · Gölcük 33 km · Orhangazi 36 km · Derince 37 km · Körfez 38 km · Bilecik 39 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 İznik (40.4286°, 29.7211°, elevation 99 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).