Your September weather guide
WarmWeather in Halkidiki in September
September is a good time to visit Halkidiki if you want warm days and comfortable sea swimming rather than intense heat. Average daytime highs are 24.5°C, the sea is also around 24.5°C, and there are about 6 rainy days. It suits a holiday built around swimming and spending time outdoors, provided you leave room for changes of plan. The catch is that neither hot afternoons nor dry weather are guaranteed.
Long-term climate averages for Nea Moudania, not a forecast · 1991-2020
Halkidiki, month by month
Your snapshot
At a glance
The useful details for Nea Moudania.
- Average daytime high
- 24.5°C
- 9 in 10 days stay below 28°C
- Average night-time low
- 19.7°C
- coldest 10% of nights: 17°C or lower
- Compared with London
- +5.9°C
- London averages 18.6°C in September
- Sea temperature
- 24.5°C
- year to year: 24°C to 26°C
- Sunshine per day (est.)
- 8.3h
- 68% of 12.2 h of daylight
- Rainy days (1 mm+)
- 6
- 46 mm over the month
- Humidity
- 68%
- Days over 25°C
- 42%
- 4% over 30°C
- Record high 1991-2020
- 34.6°C
- 2015-09-06
- Record low 1991-2020
- 11.9°C
- 2018-09-27
- Flight from London
- ≈ 3 h 30 min
- 2174 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How September compares
September is the 4th warmest month of the year in Halkidiki and ranks 98th of 134 destinations we compare for September - see where else is hot in September. Within Greece it is 30th of 44 (Greece in September). Against London's average high of 18.6°C in September, Halkidiki is 5.9°C warmer by day and 8.5°C warmer at night.
Daytime and night-time in September
The typical September day in Halkidiki peaks at 24.5°C, but that is an average: the warmest 10% of days reach 28.0°C or more. Roughly 1 in 2 days top 25°C and 1 in 24 pass 30°C. Nights average 19.7°C; one night in ten drops to 16.5°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 34.6°C (2015-09-06) and the coldest night 11.9°C (2018-09-27).
Rain in September
Some rain (4-8 rainy days): about 6 days with 1 mm or more, 46 mm in total. Year to year it varies a lot - the wettest September was 2014 with 141 mm, the driest 1994 with 2 mm. Humidity averages 68%.
Sea temperature in September
The sea averages 24.5°C - warm enough to swim (22°c+). Depending on the year it ranges from 23.6°C to 25.8°C. For the warmest sea here, come in August (26.7°C).
Sunshine and daylight
Around 8.3 hours of sunshine a day (estimated from cloud cover), 12.2 hours of daylight: the sun rises about 07:08 and sets about 19:36 local time in mid-September. Average cloud cover is 32%.
Is September a good time to visit Halkidiki?
Yes - it is one of the better months: warm days, manageable rain and long sunny days. The best months for Halkidiki on our scoring are August, July, June; months averaging 25°C or more: Jun, Jul, Aug.
Warm days without relying on strong heat
Pack mainly for warm weather, but do not expect every afternoon to feel hot. Days reach 25°C around 42% of the time, while 30°C is much less common at 4%. That makes September a sensible choice if you find strong heat tiring, though shade at midday can still be welcome. Average night lows are 19.7°C, so evenings are generally mild rather than chilly. A light jumper or jacket is still useful: the coldest 10% of nights fall to 16.5°C or below. Light daytime clothes with an extra evening layer are a better bet than packing solely for either summer heat or autumn coolness.
Good swimming conditions, with room for rain
The sea is a strong reason to choose September. At an average of 24.5°C, it is warm enough for swimming rather than just a quick dip, and the year-to-year range of 24°C to 26°C supports that judgement. Rain is the main compromise. About 6 days have measurable rain, so a completely dry holiday is not something to bank on. That does not mean those days are washouts, but it does make a lightweight waterproof useful. Keep swimming plans flexible rather than assigning them to fixed days. This month suits travellers who can work around some wet weather without needing every day to follow the same routine.
A little perspective
Halkidiki through the year
September is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 10.1°C | 5.7°C | 14.1°C | 4.2 | 56 | 8 | 0% |
| February | 11.0°C | 6.3°C | 13.5°C | 4.7 | 52 | 8 | 0% |
| March | 13.2°C | 8.1°C | 13.5°C | 5.8 | 58 | 9 | 0% |
| April | 16.5°C | 11.2°C | 14.6°C | 6.9 | 45 | 7 | 1% |
| May | 21.3°C | 15.8°C | 18.6°C | 8.3 | 49 | 7 | 13% |
| Junebest | 25.9°C | 20.5°C | 23.2°C | 10.7 | 29 | 5 | 58% |
| Julybest | 28.3°C | 23.0°C | 25.9°C | 12.0 | 36 | 5 | 95% |
| Augustbest | 28.6°C | 23.4°C | 26.7°C | 11.3 | 32 | 4 | 94% |
| SeptemberSelected | 24.5°C | 19.7°C | 24.5°C | 8.3 | 46 | 6 | 42% |
| October | 20.0°C | 15.5°C | 21.3°C | 5.4 | 56 | 8 | 5% |
| November | 15.4°C | 11.3°C | 18.0°C | 4.0 | 57 | 8 | 0% |
| December | 11.4°C | 7.4°C | 15.5°C | 3.7 | 79 | 9 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in September
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
Italy · 24°C by day · sea 24°C
Sorrento
Spain · 24°C by day · sea 25°C
Menorca
Italy · 25°C by day · sea 24°C
Puglia
Italy · 24°C by day · sea 24°C
Amalfi Coast
Croatia · 24°C by day · sea 24°C
Dubrovnik
A little more detail
Halkidiki in September FAQs
Plain answers, grounded in the averages.
Is Halkidiki hot in September?
Halkidiki is warm in September: the average daytime high is 24.5°C and nights average 19.7°C. Roughly 1 in 2 September days reach 25°C.
Can you swim in the sea in Halkidiki in September?
The sea around Halkidiki averages 24.5°C in September, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 24°C to 26°C depending on the year.
How much does it rain in Halkidiki in September?
Halkidiki sees about 6 rainy days (1 mm or more) and 46 mm of rain in a typical September. The wettest September between 1991 and 2020 was 2014 (141 mm) and the driest was 1994 (2 mm).
How sunny is Halkidiki in September?
Halkidiki gets around 8.3 hours of sunshine a day in September out of 12.2 hours of daylight (estimated from average cloud cover).
How does Halkidiki compare with the UK in September?
Halkidiki is on average 5.9°C warmer than London by day in September (24.5°C against 18.6°C).
What is the hottest September on record in Halkidiki?
Between 1991 and 2020 the hottest September day in Halkidiki reached 34.6°C on 2015-09-06, and the coldest night dropped to 11.9°C on 2018-09-27.
How much warmer is Halkidiki than London in September?
Halkidiki's average daytime high is 24.5°C, compared with 18.6°C in London, a difference of 5.9°C. That is a noticeable step up in warmth for a UK traveller, although it is not a promise of hot weather every day.
How much sunshine can I expect?
September averages about 8.3 hours of sunshine within 12.2 hours of daylight. That gives you a useful amount of bright weather for swimming and outdoor plans, but you should still allow for cloudy spells and some rain.
Is Halkidiki a short-haul option from the UK?
The flight from London takes about 3 h 30 min, making it a short-haul option for warm September weather. That is flight time rather than your full journey time, so allow separately for airport formalities and onward travel.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Néa Moudhaniá (Nea Moudania). Sea temperature from the nearest 5 km sea cell, 3 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C