Galissas weather in August 2025

Q: How hot is it in Galissas in August?

Daytime temperatures usually reach 27°C in Galissas in August with moderate heat and humidity, falling to 21°C at night.

Q: How sunny is it in Galissas in August?

There are normally 13 hours of bright sunshine each day in Galissas in August - that's 92% of daylight hours.

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

The average sea temperature around Galissas in August is 24°C.

Q: Does it ever rain in Galissas in August?

There is usually 1 day with some rain in Galissas in August and the average monthly rainfall is 2mm.

Expect 81°F daytime maximum temperatures in the shade with on average 13 hours of sunshine per day in Galissas in August. Check more long-term weather averages for Galissas in August before you book your next holiday to Syros in 2025/2026.

81
81°F max day temperature
13
13 hours of sunshine per day
1
1 day with some rainfall
70
70°F min night temperature
14
14 hours of daylight per day
M
Moderate heat & humidity
0.1
0.1 inches of monthly rainfall
9
9 (Very High) UV index
75
75°F sea temperature

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The August 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) | Imperial (°F)