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Thessaloniki in September: weather, sea & travel advice
This month's data profile
Sea conditions lead
Thessaloniki in September is climatically well suited to family holidays, beach holidays, city breaks and active holidays and hiking. The average daily high is around 27 °C, and the sea is about 25 °C. With about 6 rainy days it is moderate.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
90/100 · #1
Warmth
#4
Dryness
#3
Sun
#6
Sea warmth
#3
Published best categories: Overall, Beach, City break, Active, Family
Thessaloniki · SeptemberPhoto: Ωριγένης · CC BY-SA 3.0Climate facts
- Average high
- 27 °C
- Average low
- 17 °C
- Sea
- 25 °C
- Rainy days (est.)
- 6 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 59 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| August | 33 | 21 | 4 | 22 | 7.8 | 49 | 1.8 | 27 | 75 |
| September (selected) | 27 | 17 | 6 | 40 | 5.9 | 59 | 1.9 | 25 | 90 |
| October | 21 | 12 | 7 | 49 | 4.0 | 71 | 2.0 | 21 | 80 |
How do the previous and next months compare?
Baseline: September (90/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| August | -15 | +5.5 °C | +4.3 °C | -2.1 | -18.6 mm | +1.9 h | -9.6 % | -0.2 m/s | +2 °C |
| October | -10 | -6.2 °C | -5.1 °C | +0.7 | +8.4 mm | -1.9 h | +11.8 % | ±0 m/s | -3.3 °C |
All twelve months in context
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Frequently asked questions
How warm is Thessaloniki in September?
The average daily high is around 27 °C, with an average daily low of about 17 °C.
Can you swim in Thessaloniki in September?
The sea is about 25 °C (warm).
Does it rain a lot in Thessaloniki in September?
The curated estimate is about 6 rainy days per month, not a directly measured long-term average. Total precipitation averages around 40 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Thessaloniki?
By the climate score, May, June, September and October are the strongest months for Thessaloniki. For a beach trip: June, July, August and September. September is one of them.