Galissas weather in July 2025

Q: How hot is it in Galissas in July?

Daytime temperatures usually reach 28°C in Galissas in July with moderate heat and humidity, falling to 22°C at night.

Q: How sunny is it in Galissas in July?

There are normally 14 hours of bright sunshine each day in Galissas in July - that's 93% of daylight hours.

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

The average sea temperature around Galissas in July is 23°C.

Q: Does it ever rain in Galissas in July?

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

Expect 28°C daytime maximum temperatures in the shade with on average 14 hours of sunshine per day in Galissas in July. Check more long-term weather averages for Galissas in July before you book your next holiday to Syros in 2025/2026.

28
28°C max day temperature
14
14 hours of sunshine per day
1
1 day with some rainfall
22
22°C min night temperature
14
14 hours of daylight per day
M
Moderate heat & humidity
2
2 mm of monthly rainfall
10
10 (Very High) UV index
23
23°C sea temperature

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The July 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)