Heraklion weather in September

In September, Heraklion sees average daytime highs of 27°C and overnight lows near 19°C, with 19 mm of rain across 2.9 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 29°C in the first days to 26°C by the end. The sky is clear or mostly clear about 83% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Heraklion's 4th-clearest and 7th-windiest month. For the whole year in context, see Heraklion's year-round climate.

Daytime high
27°
4th warmest
Overnight low
19°
10th coldest
Rainfall
19 mm
2.9 wet days
Daylight
12 h 12 min
6:07 AM – 6:20 PM
Cloud cover
18%
4th clearest
Wind
9 km/h
7th windiest
Solar energy
5.68 kWh/m²
Travel score
8.1
out of 10

Heraklion is city in the island of Crete, Greece.

Density
1,258/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 29°C in the first days to 26°C by the end.

A typical September day in Heraklion reaches about 27°C in the afternoon and slips back to 19°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 31°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12921
22920
32920
42820
52820
62820
72820
82820
92820
102820
112820
122819
132819
142819
152819
162719
172719
182719
192719
202719
212719
222718
232718
242718
252618
262618
272618
282618
292618
302618

Heraklion 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 daysDaylight (hours)Travel score
Jan14° / 68129.93.9
Feb14° / 6410.510.74.2
Mar17° / 548.311.75.6
Apr20° / 11°365.612.97.3
May25° / 15°314.313.88.3
Jun28° / 19°131.914.37.9
Jul30° / 21°50.714.17.2
Aug29° / 22°60.713.37.2
Sep27° / 19°192.912.28.1
Oct24° / 16°385.911.17.8
Nov19° / 12°457.110.16.6
Dec15° / 6411.39.74.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 83% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 6%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1991
2991
3982
4982
5982
6982
7982
8964
9964
10964
11964
12964
13955
14955
15955
16955
17937
18937
19937
20928
21928
229010
239010
249010
258911
268911
278812
288713
298713
308713

Chance of precipitation in September

Any precipitation

Heraklion gets around 19 mm of rain over 2.9 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 9% and peaks near 13% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
15
25
35
46
56
66
77
87
97
107
117
127
138
148
158
169
179
189
1910
2010
2111
2211
2312
2412
2513
2613
2713
2813
2913
3013

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 45% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15295016
26295015
36304914
47314914
57314913
68324912
78324811
89334811
99334710
1010344710
111035469
121035469
131136458
141137458
151137457
161138447
171138447
181139446
191140436
201140435
211241435
221242424
231242424
241343413
251343413
261344412
271444402
281445402
291545391
301546381

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 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
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:56 AM to 6:18 AM, and sunset from 6:43 PM to 5:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:566:43
212.75:566:41
312.75:576:40
412.75:586:38
512.65:596:37
612.66:006:35
712.66:006:34
812.56:016:32
912.56:026:31
1012.46:036:29
1112.46:036:28
1212.46:046:26
1312.36:056:25
1412.36:066:23
1512.36:066:22
1612.26:076:20
1712.26:086:19
1812.16:096:17
1912.16:096:16
2012.16:106:14
2112.06:116:13
2212.06:126:11
2312.06:136:10
2411.96:136:08
2511.96:146:07
2611.86:156:05
2711.86:166:04
2811.86:176:02
2911.76:176:01
3011.76:185:59

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.68 kWh/m².

For context, solar energy here swings from a low near 2.28 kWh/m² to a high of 7.87 kWh/m² in June across the year — September's 5.68 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.3Intense
46.3Intense
56.2Intense
66.2Intense
76.1Intense
86.1Intense
96.0Intense
106.0Bright
115.9Bright
125.9Bright
135.8Bright
145.8Bright
155.7Bright
165.7Bright
175.6Bright
185.5Bright
195.5Bright
205.5Bright
215.4Bright
225.3Bright
235.3Bright
245.2Bright
255.2Bright
265.1Bright
275.1Bright
285.0Bright
295.0Bright
304.9Bright
Planning a trip in September

Hazard calendar for Heraklion

In seasonPeak

None of Heraklion's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Heraklion sees seasonal dust haze (May), heaviest in May.

Dust
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Heraklion?

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

8.1
Sightseeing
2nd-best month of the year
8.5
Beach & pool
4th-best month of the year

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

What to pack for Heraklion in September

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

In September, Heraklion sees daytime highs around 27°C and nights near 19°C. Pack light clothes. Worth having: sun protection.

light clothessun protection

Sea temperature near Heraklion in September

The nearest coast averages about 25°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 25°C and coldest in February near 16°C.

It's comfortable for a long swim from May 25 to Nov 19 — about 5.9 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb16Cool
Mar16Cool
Apr17Cool
May19Cool
Jun23Refreshing
Jul25Warm
Aug25Warm
Sep25Warm
Oct23Refreshing
Nov20Refreshing
Dec18Cool

UV index in Heraklion in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Heraklion peaks around July 13 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highHighModerateJul 13UV 10Jan 10UV 3
UV index (midday)Level
Jan3Moderate
Feb3Moderate
Mar6High
Apr8Very high
May7Very high
Jun10Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate
Location & terrain

Where is Heraklion?

Heraklion sits at 35.3°N, 25.1°E, 60 m above sea level, in Greece. The nearest listed city is Rethymno, 60 km away.

RethymnoChaniaFiraOiaParosNaxosMykonosKos

Topography around Heraklion

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

Within 3 km, the terrain around Heraklion has only modest variations in elevation — a maximum elevation change of 188 m around an average of 49 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 822 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,433 m.

The land around Heraklion is covered by artificial surfaces (53%) within 3 km, water (39%), trees (27%) and grassland (24%) within 16 km, and water (69%) within 80 km.

3 km
188 m
16 km
822 m
80 km
2,433 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Rethymno 60 km · Chania 103 km · Fira 124 km · Oia 128 km · Paros 195 km · Naxos 199 km · Mykonos 236 km · Kos 260 km

Greece travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 60% of US
price level, 2025
GDP per capita
$26,948
2025
Happiness
5.7 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
8.3
per 100k/yr, 2019
Income group
High
World Bank
English
High
EF EPI 592
Religion
other 3%Muslim 2%

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 Heraklion (35.3279°, 25.1434°, elevation 60 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).