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The average temperature in Ermoúpoli over the whole year is 19°C. July is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 11°C. The rainy (wet) season in Ermoúpoli runs from November to February, peaking in January with a 16% chance of rain on a given day. The dry season is March to October; August is the driest month, at 1%. Winds in Ermoúpoli are highest in January, averaging 5.9 m/s (21 km/h), and lightest in May, at 4.1 m/s (15 km/h). The prevailing wind is from the N. The clearest skies in Ermoúpoli come in July, when the sky is typically 17% covered; December is the cloudiest month, at 47%.
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 13°C | 11°C | 8°C | 16% | 46% | 5.9 m/s | 14 | 0 | 59 |
| February | 14°C | 11°C | 9°C | 11% | 46% | 5.9 m/s | 16 | 0 | 64 |
| March | 16°C | 12°C | 11°C | 8% | 41% | 5.5 m/s | 24 | 0 | 73 |
| April | 19°C | 15°C | 15°C | 6% | 35% | 4.7 m/s | 56 | 1 | 82 |
| May | 22°C | 18°C | 20°C | 2% | 32% | 4.1 m/s | 81 | 14 | 71 |
| June | 27°C | 23°C | 25°C | 4% | 23% | 4.6 m/s | 71 | 56 | 30 |
| July | 29°C | 25°C | 27°C | 2% | 17% | 5.8 m/s | 53 | 63 | 18 |
| August | 29°C | 25°C | 27°C | 1% | 17% | 5.7 m/s | 54 | 65 | 17 |
| September | 26°C | 22°C | 24°C | 2% | 25% | 5.2 m/s | 70 | 49 | 36 |
| October | 22°C | 19°C | 19°C | 6% | 31% | 5.4 m/s | 76 | 17 | 69 |
| November | 19°C | 16°C | 15°C | 11% | 39% | 5.5 m/s | 53 | 1 | 79 |
| December | 15°C | 13°C | 10°C | 15% | 47% | 5.5 m/s | 26 | 0 | 70 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Year round, Ermoúpoli has days of about 13°C at their warmest in January, its coolest month, and 29°C in July, its warmest; the coolest hours of the day run from 11°C to 25°C through the year, and the average temperature over the year is 19°C around the clock. Rain is most likely around January and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Winter in Ermoúpoli has typical daily highs of about 14°C and lows of about 11°C, with a 14% chance of rain on a given day.
Spring in Ermoúpoli has typical daily highs of about 19°C and lows of about 15°C, with a 5% chance of rain on a given day.
Summer in Ermoúpoli has typical daily highs of about 28°C and lows of about 25°C, with a 2% chance of rain on a given day.
Autumn in Ermoúpoli has typical daily highs of about 22°C and lows of about 19°C, with a 6% chance of rain on a given day.
The rainy (wet) season in Ermoúpoli runs from November to February, peaking in January with a 16% chance of rain on a given day. The dry season is March to October; August is the driest month, at 1%.
Winds in Ermoúpoli are highest in January, averaging 5.9 m/s (21 km/h), and lightest in May, at 4.1 m/s (15 km/h). The prevailing wind is from the N.
The average temperature in Ermoúpoli over the whole year is 19°C. July is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 11°C.