Weather in Side in September

How September compares

September is the 4th warmest month of the year in Side. Within Turkey it is 18th of 18 (Turkey in September). Against London's average high of 18.6°C in September, Side is 4.1°C warmer by day and 5.6°C warmer at night.

Daytime and night-time in September

The typical September day in Side peaks at 22.7°C, but that is an average: the warmest 10% of days reach 26.8°C or more. Roughly 1 in 4 days top 25°C and 1 in 50 pass 30°C. Nights average 16.8°C; one night in ten drops to 13.6°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 36.5°C (2017-09-12) and the coldest night 8.8°C (1992-09-29).

Rain in September

Wet (more than 8 rainy days): about 14 days with 1 mm or more, 119 mm in total. Year to year it varies a lot - the wettest September was 1996 with 227 mm, the driest 2017 with 33 mm. Humidity averages 84%.

Sea temperature in September

The sea averages 23.4°C - warm enough to swim (22°c+). Depending on the year it ranges from 22.3°C to 24.4°C. For the warmest sea here, come in August (25.5°C).

Sunshine and daylight

Around 5.9 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 06:11 and sets about 18:40 local time in mid-September. Average cloud cover is 52%.

Is September a good time to visit Side?

September is not the strongest month here: warm days and frequent rain. The best months for Side on our scoring are July, August, June; months averaging 25°C or more: Jul, Aug.

Warm days, with a layer for evenings

Expect weather that generally favours light daytime clothing, rather than the sort of heat that dictates your whole schedule. Average night-time lows of 16.8°C make a cardigan or light jacket useful when you stay out late. On the coldest 10% of nights, temperatures fall to 13.6°C or lower, so packing only summer clothes would be a gamble. The warmest 10% of days reach 26.8°C or more, leaving room for noticeably hotter afternoons too. Keep sun protection handy and take a shaded break if midday feels warm, but do not choose September expecting strong heat every day.

Rain is the main compromise

September is a wet month in Side, not simply a sunny month with an occasional interruption. About 14 rainy days makes a light waterproof and footwear you can wear in the wet sensible additions to your luggage. That does not mean those days are necessarily washouts, but it does make a rigid outdoor itinerary risky. There are about 5.9 hours of sunshine within 12.3 hours of daylight, so daylight should not be confused with clear skies. Humidity averages 84%, which may feel clammy. Leave room to move outdoor plans around the forecast rather than assuming each morning will be dry.

Swimming is a reasonable part of the plan

The sea is a stronger reason to choose September than a promise of continuous sunshine. At an average of 23.4°C, it is warm enough for swimming, though personal tolerance still matters. The year-to-year range of 22°C to 24°C also supports packing swimwear rather than treating a dip as an unlikely bonus. Sea warmth does not guarantee suitable conditions on any particular day, so let local conditions guide you. Bring something dry to put on afterwards, especially if you linger outside into the evening. This month suits travellers happy to fit swimming around the weather, rather than those needing every day to be a beach day.