Weather in Marmaris in September

How September compares

September is the 4th warmest month of the year in Marmaris and ranks 18th of 134 destinations we compare for September - see where else is hot in September. Within Turkey it is 6th of 18 (Turkey in September). Against London's average high of 18.6°C in September, Marmaris is 11.2°C warmer by day and 10.4°C warmer at night.

Daytime and night-time in September

The typical September day in Marmaris peaks at 29.8°C, but that is an average: the warmest 10% of days reach 33.6°C or more. About 96% of days top 25°C and 1 in 2 pass 30°C. Nights average 21.6°C; one night in ten drops to 19.2°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 38.8°C (2020-09-09) and the coldest night 16.3°C (1992-09-27).

Rain in September

Dry (3 rainy days or fewer): about 2 days with 1 mm or more, 16 mm in total. Year to year it varies a lot - the wettest September was 1996 with 66 mm, the driest 1992 with 0 mm. Humidity averages 61%.

Sea temperature in September

The sea averages 26.0°C - warm enough to swim (22°c+). Depending on the year it ranges from 25.1°C to 26.9°C. For the warmest sea here, come in August (26.9°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 06:49 and sets about 19:15 local time in mid-September. Average cloud cover is 9%.

Is September a good time to visit Marmaris?

Yes - it is one of the better months: hot days, little rain and long sunny days. The best months for Marmaris on our scoring are September, June, May; months averaging 25°C or more: Jun, Jul, Aug, Sep.

Still hot enough to plan around midday

Do not choose September expecting mild autumn weather. Days reach 25°C on 96% of occasions, while 46% reach 30°C, so light, breathable clothing should do most of the work. The hottest days can push beyond the average: the warmest 10% reach 33.6°C or more. Keep longer walks and anything energetic for the cooler parts of the day, and make shade part of your midday plans. Evenings are warm on average, which makes eating outdoors appealing without needing heavy layers. A light extra layer is still sensible if you tend to feel cool after sunset, rather than packing only for daytime heat.

Rain is a small risk, not a reason to stay away

September is generally dry, with about 2 rainy days, so rain is unlikely to be the main constraint on your holiday. That is not a promise of an entirely dry stay, but it supports making outdoor plans without organising everything around wet weather. Sunshine averages about 11.1 hours a day out of 12.2 hours of daylight, leaving plenty of time outside without having to squeeze activities into midday. Sun protection and access to shade deserve more attention in your packing and daily routine than heavy waterproofs. Keep some flexibility for a wet spell rather than assuming every day will follow the same pattern.

Warm sea makes swimming a strong reason to go

The sea averages 26°C, making September a good fit if swimming is central to your holiday. Its year-to-year range of 25°C to 27°C stays comfortably within warm swimming conditions, rather than the bracing water that can make a dip feel like a challenge. Combined with the hot afternoons, that makes time by the water an easy way to shape the day, though swimming does not replace sun protection. September also sits alongside June and May among the best months here overall. Choose it for warmth and low rain risk, not for a guarantee of gentle daytime temperatures.