Greece
Santorini in September: weather, sea & travel advice
This month's data profile
Sea conditions lead
Santorini in September is climatically well suited to beach holidays, family holidays, city breaks and active holidays and hiking. The average daily high is around 25 °C, and the sea is about 24 °C. With about 2 rainy days it is very dry.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
94/100 · #1
Warmth
#3
Dryness
#4
Sun
#6
Sea warmth
#2
Published best categories: Overall, Beach, City break, Family
Santorini · SeptemberPhoto: Carl Rottmann · PDM-ownerClimate facts
- Average high
- 25 °C
- Average low
- 23 °C
- Sea
- 24 °C
- Rainy days (est.)
- 2 rainy days (est.)
- Sun (est.)
- 7 h/day
- Humidity
- 73 %
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 | 27 | 24 | 1 | 2 | 8.7 | 74 | 5.3 | 25 | 92 |
| September (selected) | 25 | 23 | 2 | 14 | 7.1 | 73 | 5.1 | 24 | 94 |
| October | 22 | 20 | 6 | 39 | 5.0 | 75 | 5.0 | 22 | 85 |
How do the previous and next months compare?
Baseline: September (94/100)
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 | -2 | +1.9 °C | +1.4 °C | -1.8 | -11.9 mm | +1.6 h | +1.5 % | +0.3 m/s | +0.6 °C |
| October | -9 | -3.1 °C | -2.8 °C | +3.3 | +25.5 mm | -2.1 h | +2 % | -0.1 m/s | -1.8 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Santorini in September?
The average daily high is around 25 °C, with an average daily low of about 23 °C.
Can you swim in Santorini in September?
The sea is about 24 °C (swimmable).
Does it rain a lot in Santorini in September?
The curated estimate is about 2 rainy days per month, not a directly measured long-term average. Total precipitation averages around 14 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Santorini?
By the climate score, June, July, August and September are the strongest months for Santorini. For a beach trip: June, July, August and September. September is one of them.