Galissas weather in October 2025

Q: How hot is it in Galissas in October?

Daytime temperatures usually reach 21°C in Galissas in October, falling to 16°C at night.

Q: How sunny is it in Galissas in October?

There are normally 7 hours of bright sunshine each day in Galissas in October - that's 64% of daylight hours.

Q: How warm is the sea around Galissas in October?

The average sea temperature around Galissas in October is 21°C.

Q: Does it rain in Galissas in October?

There are usually 4 days with some rain in Galissas in October and the average monthly rainfall is 48mm.

Expect 21°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Galissas in October. Check more long-term weather averages for Galissas in October before you book your next holiday to Syros in 2025/2026.

21
21°C max day temperature
7
7 hours of sunshine per day
4
4 days with some rainfall
16
16°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
48
48 mm of monthly rainfall
5
5 (Moderate) UV index
21
21°C sea temperature

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The October weather guide for Syros, represented by Galissas, (Galissas) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)