Average annual temperature is 20.6 °C
Absolute maximum temperature: 33.5 °C
Absolute minimum temperature: 7.1 °C
Number of sunny days: 244 days
Number of rainy days: 121 days
Look at detailed online map of Sými
* Weather data for Sými Greece is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 18.9 | 19.1 | 18.4 | 19.2 | 24.2 | 28.2 | 33.5 | 29.8 | 31.4 | 27.6 | 25.1 | 21.4 |
| Average daytime temperature (°C) | 17.0 | 14.5 | 16.9 | 17.7 | 20.3 | 24.6 | 29.7 | 27.8 | 28.4 | 25.4 | 22.2 | 19.1 |
| Average temperature (°C) | 16.0 | 13.3 | 15.8 | 16.6 | 19.0 | 23.2 | 27.1 | 26.6 | 26.7 | 23.9 | 20.8 | 18.0 |
| Average night temperature (°C) | 15.0 | 12.3 | 14.7 | 15.6 | 18.0 | 22.0 | 25.0 | 25.5 | 25.1 | 22.8 | 19.1 | 17.0 |
| Absolute minimum temperature (°C) | 11.2 | 7.1 | 10.8 | 12.3 | 16.0 | 19.2 | 21.5 | 24.0 | 21.3 | 21.3 | 12.5 | 13.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 8.1 | 8.9 | 9.9 | 10.8 | 11.7 | 13.2 | 13.3 | 12.4 | 11.4 | 9.8 | 8.0 | 7.7 |
| Precipitation (mm) | 136 | 36 | 46 | 32 | 18 | 11 | 0 | 0 | 35 | 7 | 188 | 152 |
| Sunny days | 15 | 17 | 18 | 16 | 18 | 25 | 31 | 31 | 23 | 28 | 10 | 12 |
| Rainy days | 16 | 11 | 13 | 14 | 13 | 5 | 0 | 0 | 7 | 3 | 20 | 19 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Sými during the most sunny months:
The largest precipitation sum in Sými is at