Kos, Greece
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Kos

September beach and weather guide

Based on 5 years of historical ERA5 climate data

Photo by Wolfgang Weiser on Unsplash

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September beach conditions — historical average

Excellent
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28.2°C Temp
26.9°C Sea temp
0.4 Rain days
11.9h Sunshine hrs
64.2% Humidity
100%

Reliable conditions

5 of 5 years were good

Year by year — mid September

2024 Excellent 27.4°C · 2 rainy days · 11.8h sun
2023 Excellent 29.4°C · 0 rainy days · 12.0h sun
2022 Excellent 27.6°C · 0 rainy days · 12.0h sun
2021 Excellent 27.8°C · 0 rainy days · 12.0h sun
2020 Excellent 29.0°C · 0 rainy days · 11.9h sun

Other months in Kos

May June July August September October

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Each trip type is scored on what matters most for it — snow days for skiing, sea temp for beach, sunshine for sightseeing.

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About Kos in September

Based on 5 years of ERA5 historical climate data, September in Kos has historically been excellent for a beach holiday. Average temperatures of 28.2°C with sea temperatures around 26.9°C and 0.4 rainy days on average.

5 of the last 5 years had good beach conditions during this period. This data uses ERA5 reanalysis records — real historical measurements, not generalised averages.

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