Weather in Kos in October

How October compares

October is the 5th warmest month of the year in Kos and ranks 81st of 134 destinations we compare for October - see where else is hot in October. Within Greece it is 19th of 44 (Greece in October). Against London's average high of 14.6°C in October, Kos is 7.7°C warmer by day and 11.1°C warmer at night.

Daytime and night-time in October

The typical October day in Kos peaks at 22.3°C, but that is an average: the warmest 10% of days reach 24.7°C or more. Roughly 1 in 13 days top 25°C and 1 in 333 pass 30°C. Nights average 19.5°C; one night in ten drops to 16.4°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest October day here reached 31.3°C (2020-10-05) and the coldest night 10.8°C (2003-10-29).

Rain in October

Some rain (4-8 rainy days): about 5 days with 1 mm or more, 60 mm in total. Year to year it varies a lot - the wettest October was 1994 with 219 mm, the driest 2004 with 1 mm. Humidity averages 72%.

Sea temperature in October

The sea averages 22.8°C - warm enough to swim (22°c+). Depending on the year it ranges from 21.5°C to 24.0°C. For the warmest sea here, come in August (25.2°C).

Sunshine and daylight

Around 8.1 hours of sunshine a day (estimated from cloud cover), 11.0 hours of daylight: the sun rises about 07:18 and sets about 18:35 local time in mid-October. Average cloud cover is 27%.

Is October a good time to visit Kos?

It is a reasonable choice: warm days. The best months for Kos on our scoring are August, July, June; months averaging 25°C or more: Jul, Aug, Sep.

Warm days, but not dependable heat

Expect weather that feels noticeably warmer than London, rather than full summer heat. Kos has an average daytime high of 22.3°C, compared with London's 14.6°C, so light daytime clothing is a sensible starting point. Only 8% of days reach 25°C, which makes October better suited to travellers who enjoy gentle warmth than those who want to bake beside the pool. Average night lows are 19.5°C, although the coldest 10% of nights fall to 16.4°C or below. Pack a light jumper or jacket for sitting outside after dark rather than relying entirely on your daytime clothes. Keep outdoor plans flexible around how warm the day actually feels.

Enough sunshine, with a rain contingency

October brings about 8.1 hours of sunshine within 11.0 hours of daylight, leaving useful time for being outdoors without needing every day to be cloudless. About 5 days have measurable rain, so a waterproof layer deserves space in your bag even if most of your packing is for warm weather. The practical approach is to use sunny spells for the water and leave less weather-dependent plans for wetter periods. Rain is a consideration, not a reason on its own to rule October out. If your holiday depends on uninterrupted sunshine, though, the possibility of wet days is a catch you should take seriously.

The sea is still suitable for swimming

The sea is a strong reason to consider Kos in October. At an average of 22.8°C, it remains suitable for swimming, with the year-to-year range running from 22°C to 24°C. That makes a dip a realistic part of the holiday rather than something reserved for travellers who enjoy cold water. Personal comfort still matters, so don't assume the temperature will feel equally inviting to everyone. Choose the sunnier, warmer parts of the day for time in and out of the water, and have something dry to put on afterwards. October suits you well if sea swimming matters more than very hot air temperatures.