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Weather extremes

How extreme does Ermoúpolis's weather get?

The hottest, coldest, wettest and snowiest days Ermoúpolis has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 27 years of daily weather observations (1998–present), from the Syros / Dimitrios Vikelas station 3 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Ermoúpolis has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
105°F Jul 26, 2023

That is about 20°F hotter than a normal July afternoon in Ermoúpolis (typical high near 85°F).

The three most extreme on record

1 105°F Jul 26, 2023recent
2 104°F Jul 2, 2017
3 102°F Jul 9, 2000
❄️ Coldest night
30°F Feb 14, 2004

About 20°F colder than a normal February night in Ermoúpolis (typical low near 50°F).

The three most extreme on record

1 30°F Feb 14, 2004
2 30°F Feb 18, 2008
3 30°F Feb 18, 2015
🌧️ Most rain in one day
7.91 in Sep 29, 2023

More rain in a single day than Ermoúpolis usually gets in the whole month of September (typical September total about 0.0 in).

The three most extreme on record

1 7.91 in Sep 29, 2023recent
2 2.80 in Jan 16, 2024
3 1.85 in Feb 16, 2017

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

10°30°50°70°90°110°130° all-time high 105°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Ermoúpolis's record heat sits well above even a hot day for the season — July's 105°F is about 20°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Ermoúpolis's warmest days reach the mid-80s°F and its coldest nights drop to the high 40s°F. But across the record it has gone as high as 105°F and as low as 30°F. A single day has delivered over 8 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Syros / Dimitrios Vikelas, a weather station, about 3 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →