ThessalonikiPhoto: Ωριγένης · CC BY-SA 3.0Greece · Europe
Best time to visit Thessaloniki
Thessaloniki charms with Byzantine heritage, a seafront promenade and some of Greece's best food. Summers are hot, spring and autumn mild and perfect for city trips, and the sea warms up for swimming in summer.
Climate decision
Best travel months for Thessaloniki
Top recommendation
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Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Latest 5-year values 2021–2025
Average of the five most recent complete years compared with the 1991–2025 climate average.
July · Mean daily maximum
35.4 °C
1991–2025: 33.1 °C
+2.3 °C · higher
July · Wet days
2.6 days/month
1991–2025: 4.7 days/month
-2.1 days/month · lower
February · Monthly precipitation
21.7 mm/month
1991–2025: 35.4 mm/month
-13.7 mm/month · lower
August · Sea temperature
27.6 °C
1991–2025: 26.6 °C
+0.9 °C · higher
August: 148/155 days at or above 30 °C; highest single value 41.5 °C.
Five-year historical sample, not a weather forecast or long-term climate trend. Individual hot days can be far above the monthly mean.
Annual profile · Coast and sea
Thessaloniki: the swimming season follows two curves
Average daily highs vary by 24.3 °C through the year, while the sea varies by 13.8 °C. Air and water temperature should therefore be considered separately.
The practical difference
The month with the highest daytime temperature and the month with the warmest sea need not define the same travel window. Rain and sunshine help resolve the trade-off.
Warmest sea
August · 26.6 °C
Highest average daily high
July and August · 33.1 °C
Fewest rainy days
August · 4.1
Most sunshine
July · 8.8 h
Month by month
Overall suitability per month. Tap a month for details.
All climate figures compared
The table is the complete accessible data view; the charts below highlight selected patterns.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Rain mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| January | 9 | 1 | 8 | 45 | 2.4 | 82 | 2.3 | 14 | 36 |
| February | 10 | 2 | 7 | 35 | 3.3 | 79 | 2.4 | 13 | 40 |
| March | 14 | 4 | 8 | 44 | 4.7 | 75 | 2.2 | 13 | 47 |
| April | 18 | 8 | 7 | 40 | 6.3 | 71 | 2.0 | 15 | 64 |
| May | 24 | 13 | 8 | 44 | 7.6 | 64 | 1.9 | 19 | 81 |
| June | 30 | 18 | 7 | 34 | 8.7 | 56 | 1.8 | 23 | 82 |
| July | 33 | 21 | 5 | 24 | 8.8 | 48 | 1.8 | 26 | 75 |
| August | 33 | 21 | 4 | 22 | 7.8 | 49 | 1.8 | 27 | 75 |
| September | 27 | 17 | 6 | 40 | 5.9 | 59 | 1.9 | 25 | 90 |
| October | 21 | 12 | 7 | 49 | 4.0 | 71 | 2.0 | 21 | 80 |
| November | 15 | 7 | 8 | 50 | 2.6 | 79 | 2.1 | 18 | 52 |
| December | 10 | 3 | 9 | 61 | 2.0 | 83 | 2.3 | 15 | 37 |
Climate through the year
Compare temperature, rainy days, sunshine and, for coastal destinations, sea temperature month by month.
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Where to stay in Thessaloniki
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Frequently asked questions
When is the best time to visit Thessaloniki?
The strongest climate months are May, June, September, October. Values are historical averages, not a forecast.
Which month has the highest average daily maximum temperature in Thessaloniki?
Average daily maximum temperatures in Thessaloniki are practically tied in July and August at around 33 °C.
When is the sea warmest at Thessaloniki?
In August, at around 27 °C.