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Oia weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Oia?
For a warm holiday, the best week has been 19–25 June (Weather Index 97). Favourable start dates for a 7-day trip run from 5 June to 28 June. August is warmest (26°C), July is driest and June and July have the most sun.
- Warmest
- August 26°C
- Coolest
- January, February and March 15°C
- Driest
- July 0% rain-day chance
- Wettest
- January 39% rain-day chance
- Sunniest
- June and July 14 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Oia
Oia historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 14.6 | 12.7 | 39.0 | 12.1 | 70.2 | 8.3 |
| February | 14.5 | 13.0 | 25.7 | 7.2 | 44.1 | 9.5 |
| March | 15.3 | 13.7 | 21.9 | 6.8 | 40.0 | 10.5 |
| April | 17.0 | 15.6 | 6.3 | 1.9 | 9.2 | 12.0 |
| May | 19.6 | 18.2 | 4.8 | 1.5 | 5.8 | 12.8 |
| June | 23.3 | 22.1 | 1.7 | 0.5 | 2.2 | 13.9 |
| July | 25.3 | 24.1 | 0.0 | 0.0 | 0.1 | 13.6 |
| August | 25.6 | 24.5 | 1.0 | 0.3 | 1.1 | 12.9 |
| September | 24.2 | 23.0 | 2.3 | 0.7 | 2.4 | 11.8 |
| October | 21.4 | 20.1 | 6.5 | 2.0 | 8.9 | 10.2 |
| November | 19.0 | 17.5 | 15.0 | 4.5 | 30.7 | 9.3 |
| December | 16.1 | 14.4 | 34.5 | 10.7 | 64.3 | 8.3 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.