Monthly climate guide
Íos weather in September
Expect warm weather in Íos in September: afternoons reach about 25°C (77°F), while nights drop to around 24°C (74°F). Around 18 mm of rain falls over the month (very dry), and skies are mostly sunny. Daytime highs are 2°C cooler than August and 3°C warmer than October.
What stands out in September
- There's little difference between day and night (around 2°C).
- Nights stay warm, rarely below 24°C — air-conditioning helps.
- Humidity near 74% makes 25°C feel stickier than it sounds.
- Only 2 months are warmer in Íos than September.
Avg high
25°C
77°F
Avg low
24°C
74°F
Rainfall
18 mm
very dry
Humidity
74%
relative
Sky
16%
cloud · mostly sunny
Íos weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 15°C / 58°F | 13°C / 55°F | 93 mm | 74% | 60% |
| February | 15°C / 59°F | 13°C / 56°F | 73 mm | 76% | 55% |
| March | 16°C / 60°F | 14°C / 57°F | 46 mm | 76% | 51% |
| April | 18°C / 64°F | 16°C / 60°F | 22 mm | 77% | 42% |
| May | 21°C / 69°F | 19°C / 66°F | 18 mm | 78% | 36% |
| June | 24°C / 76°F | 23°C / 73°F | 7 mm | 76% | 16% |
| July | 27°C / 80°F | 25°C / 76°F | 3 mm | 74% | 7% |
| August | 27°C / 80°F | 25°C / 77°F | 3 mm | 75% | 6% |
| September | 25°C / 77°F | 24°C / 74°F | 18 mm | 74% | 16% |
| October | 22°C / 71°F | 21°C / 69°F | 40 mm | 75% | 34% |
| November | 19°C / 66°F | 18°C / 64°F | 53 mm | 75% | 49% |
| December | 16°C / 61°F | 15°C / 58°F | 74 mm | 74% | 56% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- Sunglasses
Is September a good time to visit Íos?
Compare the months in the chart above to find your ideal window.
Best time to visit Íos →Other Greece cities in September
Cite or embed this data
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Íos weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/greece/ios/september
<a href="https://weathercompare.eu/weather/greece/ios/september">Íos weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/greece/ios" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Íos weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/greece/ios/september">Íos weather in September</a> – WeatherCompare</p>
Íos in September: quick answers
Is September a good time to visit Íos?
September is a reasonable time for Íos: highs around 25°C and about 18 mm of rain, though not one of the three best months.
How warm is Íos in September?
Average highs are about 25°C (77°F) and average lows about 24°C (74°F), based on 10 years of daily data.
Does it rain a lot in Íos in September?
Íos typically gets around 18 mm of rain in September — very dry.
Figures are long-term averages for the area around Íos (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.