Galissas Temperature by Month
The average annual maximum temperature in Galissas, Cyclades, Greece is 20°C (68°F), with daytime highs ranging from 15°C (59°F) in January to 27°C (81°F) in August. This page covers monthly averages, day-night differences, and how Galissas compares to cities worldwide.
Galissas Monthly Temperatures
Visitors to Galissas can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 24°C (75°F) in August to 12°C (54°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Galissas by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating.
The chart below shows the average temperature throughout the year:
Temperature: Galissas vs Greece
The map below shows the annual temperature across Greece. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Galissas vs World: Temperature Compared
Galissas's average annual maximum temperature is 20°C (68°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Queenstown, New Zealand averages 10°C (50°F) annually — remember seasons are flipped, so its coldest months fall in June and July.
New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in Galissas?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Galissas, January is the coolest month, with average highs of 15°C (59°F) and humidity around 72% — considered high. In August, the warmest month, temperatures average 27°C (81°F) with 70% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Galissas's weather — including monthly rainfall, sunshine hours, and humidity — visit our Galissas climate page.
