Your September weather guide
HotWeather in Dalaman in September
September is a good choice for Dalaman if you want hot days and a warm sea without much rain. Daytime highs average around 30°C, nights stay near 20°C, and the sea is still 26.5°C. The catch is that this is hot weather, not gentle autumn warmth: midday can feel demanding if you prefer being active. It suits travellers who want to swim, spend time outdoors and keep the hottest part of the day flexible.
Long-term climate averages for Dalaman, not a forecast · 1991-2020
Dalaman, month by month
Your snapshot
At a glance
The useful details for Dalaman.
- Average daytime high
- 29.9°C
- 9 in 10 days stay below 33°C
- Average night-time low
- 20.3°C
- coldest 10% of nights: 18°C or lower
- Compared with London
- +11.3°C
- London averages 18.6°C in September
- Sea temperature
- 26.5°C
- year to year: 26°C to 27°C
- Sunshine per day (est.)
- 11.1h
- 91% of 12.2 h of daylight
- Rainy days (1 mm+)
- 3
- 16 mm over the month
- Humidity
- 59%
- Days over 25°C
- 97%
- 48% over 30°C
- Record high 1991-2020
- 38.7°C
- 2015-09-07
- Record low 1991-2020
- 13.6°C
- 1992-09-29
- Flight from London
- ≈ 4 h 12 min
- 2789 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 3rd warmest month of the year in Dalaman. Within Turkey it is 4th of 18 (Turkey in September). Against London's average high of 18.6°C in September, Dalaman is 11.3°C warmer by day and 9.1°C warmer at night.
Daytime and night-time in September
The typical September day in Dalaman peaks at 29.9°C, but that is an average: the warmest 10% of days reach 33.3°C or more. About 97% of days top 25°C and 1 in 2 pass 30°C. Nights average 20.3°C; one night in ten drops to 17.5°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 38.7°C (2015-09-07) and the coldest night 13.6°C (1992-09-29).
Rain in September
Dry (3 rainy days or fewer): about 3 days with 1 mm or more, 16 mm in total. Year to year it varies a lot - the wettest September was 1996 with 60 mm, the driest 1992 with 0 mm. Humidity averages 59%.
Sea temperature in September
The sea averages 26.5°C - warm enough to swim (22°c+). Depending on the year it ranges from 25.6°C to 27.4°C. For the warmest sea here, come in August (27.5°C).
Sunshine and daylight
Around 11.1 hours of sunshine a day (estimated from cloud cover), 12.2 hours of daylight: the sun rises about 06:47 and sets about 19:13 local time in mid-September. Average cloud cover is 9%.
Is September a good time to visit Dalaman?
Yes - it is one of the better months: hot days, little rain and long sunny days. The best months for Dalaman on our scoring are September, June, October; months averaging 25°C or more: Jun, Jul, Aug, Sep, Oct.
Expect heat rather than an autumn cool-down
Pack mainly for summer. With 97% of days reaching 25°C and 48% reaching 30°C, September is reliably warm but often properly hot. The hotter days reach 33.3°C or more, so plan anything energetic for the morning or later in the day rather than pushing through midday. Light, loose clothing, a hat and sunscreen make more sense than a wardrobe built around layers. Shade breaks are sensible even if you enjoy heat. September suits travellers happy to slow their pace when temperatures rise; if your ideal holiday involves walking throughout the day without thinking about the heat, it may still feel too warm.
Warm swimming water, with little rain to plan around
The sea is a strong reason to choose September: at 26.5°C on average, it is warm enough for swimming rather than just a quick dip. The year-to-year range of 26°C to 27°C also points to consistently warm water. Rain is usually a minor interruption, with about 2 rainy days during the month, though that does not guarantee a dry stay. Sunshine averages about 11.1 hours a day, leaving plenty of scope to move outdoor plans away from midday. For packing, prioritise swimwear and sun protection over bulky wet-weather clothing, but keep a light rain layer handy and allow some flexibility if a shower arrives.
A little perspective
Dalaman 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 | 13.8°C | 6.8°C | 17.9°C | 5.0 | 168 | 11 | 0% |
| February | 14.5°C | 6.9°C | 16.9°C | 5.6 | 129 | 10 | 0% |
| March | 16.8°C | 8.2°C | 16.7°C | 6.7 | 90 | 9 | 0% |
| April | 19.9°C | 10.9°C | 17.4°C | 7.9 | 62 | 9 | 4% |
| May | 24.5°C | 15.2°C | 20.1°C | 9.9 | 39 | 7 | 42% |
| Junebest | 29.7°C | 19.8°C | 23.1°C | 12.8 | 13 | 3 | 95% |
| July | 33.2°C | 23.1°C | 25.9°C | 13.8 | 4 | 1 | 100% |
| August | 33.3°C | 23.6°C | 27.5°C | 12.8 | 5 | 1 | 100% |
| SeptemberSelectedbest | 29.9°C | 20.3°C | 26.5°C | 11.1 | 16 | 3 | 97% |
| Octoberbest | 25.0°C | 16.0°C | 24.3°C | 8.1 | 64 | 5 | 53% |
| November | 19.5°C | 11.5°C | 21.8°C | 6.1 | 109 | 6 | 3% |
| December | 15.2°C | 8.4°C | 19.5°C | 4.9 | 153 | 11 | 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.
A little more detail
Dalaman in September FAQs
Plain answers, grounded in the averages.
Is Dalaman hot in September?
Dalaman is hot in September: the average daytime high is 29.9°C and nights average 20.3°C. About 97% of September days reach 25°C or more.
Can you swim in the sea in Dalaman in September?
The sea around Dalaman averages 26.5°C in September, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 26°C to 27°C depending on the year.
How much does it rain in Dalaman in September?
Dalaman sees about 3 rainy days (1 mm or more) and 16 mm of rain in a typical September. The wettest September between 1991 and 2020 was 1996 (60 mm) and the driest was 1992 (0 mm).
How sunny is Dalaman in September?
Dalaman gets around 11.1 hours of sunshine a day in September out of 12.2 hours of daylight (estimated from average cloud cover).
How does Dalaman compare with the UK in September?
Dalaman is on average 11.3°C warmer than London by day in September (29.9°C against 18.6°C).
What is the hottest September on record in Dalaman?
Between 1991 and 2020 the hottest September day in Dalaman reached 38.7°C on 2015-09-07, and the coldest night dropped to 13.6°C on 1992-09-29.
Will I need a jacket in the evenings?
A light layer is sensible, but heavy evening clothing is unlikely to be your main need. Night lows average 20.3°C, although the coldest 10% of nights fall to 17.5°C or lower. Pack something you can easily add when sitting outside.
How much warmer is Dalaman than London in September?
Dalaman's average daytime high is 29.9°C, compared with 18.6°C in London, a difference of 11.3°C. That means packing for hot summer days rather than typical UK September weather, and giving more thought to shade and the timing of outdoor activity.
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 Dalaman. Sea temperature from the nearest 5 km sea cell, 10.4 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