Weather in Thessaloniki in September 2025
Average weather
Average temperature in Thessaloniki in September
The expected average maximum temperature in September is +28°C with a maximum of +32°C and a minimum of +17°C.
The average maximum temperature goes down 13% by the end of the month, compared with the beginning of the month, from +30°C to +28°C.
Is Thessaloniki warm or cold in September?
Thessaloniki is typically warm in September.
Maximum temperatures go down compared to the previous month from +31°C to +27°C. The minimum temperature also goes down from +22°C to +18°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Thessaloniki:
Water temperature in Thessaloniki in September
Water in Thessaloniki in September is Comfortable. It varies from +22°C to +27°C, with an average of +25°C. This is almost similar to the air temperature, which averages +27°C.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Thessaloniki in September?
Climate in Thessaloniki in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +31°C | +27°C | +21°C | ||||
| Min. temperature | ||||||
| +14°C | +10°C | +3°C | ||||
| Max. temperature | ||||||
| +41°C | +36°C | +32°C | ||||
| Rainfall | ||||||
| 25 mm | 49 mm | 66 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +26°C | +25°C | +21°C | ||||
| Humidity | ||||||
| 55% | 61% | 69% | ||||
| Air pressure | ||||||
| 1012 HPa | 1015 HPa | 1018 HPa | ||||
| Sunny days | ||||||
| 20 | 16 | 11 | ||||
| Cloudy days | ||||||
| 2 | 4 | 9 | ||||
| Rainy days | ||||||
| 5 | 7 | 10 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as great as in August. It’s getting colder in September. From +31°C in the day, the average maximum temperature lowers to +27°C. Prepare for more rain. Average rainfall goes from 25 mm to 49 mm. Humidity rises from 55% to 61%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 20 sunny days in August to 16 in September.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Thessaloniki is gradually decreasing during September, going from 2 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Thessaloniki?
Climate Change over Years
The climate in Thessaloniki in September has not changed much over the last 43 years.
The average temperature was the lowest in 1991 (+18°C) and the highest in 2013 (+23°C). The driest year was 1989 with only 258 mm of rainfall, and the wettest year was 2020 with 1565 mm.
FAQ
Is September a good time to visit Thessaloniki?
Can you sunbathe in Thessaloniki in September?
Can you swim in Thessaloniki in September?
Is Thessaloniki rainy in September?
Is it sunny in Thessaloniki in September?
Other cities in Greece
Monthly weather in Thessaloniki
Source of the data
For this page, we’ve looked at the typical weather in Thessaloniki, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.