Thessaloníki climate

Name: Thessaloníki
Address: GR

Thessaloníki is warmest in July, with average highs of 32 °C, and coldest in January, when nights average 1.5 °C. December is the wettest month (70 mm) and August the driest (40 mm). Figures are 1991–2020 climate normals.

Across a full year Thessaloníki averages 646 mm of rain, 128 days above 25 °C and 23 days below freezing.

Greece · population 317,778 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 32 °C
Coldest month January 1.5 °C
Driest month August 40 mm
Wettest month December 70 mm
Least cloud July 20 % cloud
Hottest on record July 42 °C
Coldest on record January -12 °C
Warmest sea August 27 °C

What to expectThessaloníki through the year

Thessaloníki has a clear annual cycle: average daily highs run from 9.3 °C in January to 32 °C in July, a swing of 22 °C in mean temperature across the year.

Counted across a normal year, 128 days a year reach 25 °C, 65 of them reach 30 °C, 23 nights drop below freezing. The warmest reading in the 1991–2020 record is 42 °C, in July.

Rain is spread fairly evenly through the year, from 40 mm in August to 70 mm in December. There is no dry season to aim for.

The sea off Thessaloníki is warmest in August at 27 °C and coldest in February at 13 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	9.3 °C	50 mm	54 %
February	11.2 °C	48 mm	55 %
March	14.7 °C	61 mm	53 %
April	19.0 °C	57 mm	50 %
May	24.3 °C	66 mm	45 %
June	29.2 °C	46 mm	31 %
July	31.8 °C	41 mm	20 %
August	31.7 °C	40 mm	20 %
September	26.7 °C	49 mm	34 %
October	21.0 °C	59 mm	50 %
November	15.2 °C	58 mm	59 %
December	10.2 °C	70 mm	58 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	9.3 °C	1.5 °C	5.0 °C	18.4 °C	-12.2 °C	0	0	9
February	11.2 °C	2.8 °C	6.8 °C	21.1 °C	-8.0 °C	0	0	6
March	14.7 °C	5.7 °C	10.1 °C	26.8 °C	-3.0 °C	0	0	1
April	19.0 °C	9.9 °C	14.4 °C	29.6 °C	-4.5 °C	1	0	0
May	24.3 °C	15.3 °C	19.8 °C	35.9 °C	9.0 °C	13	1	0
June	29.2 °C	19.9 °C	24.6 °C	40.1 °C	11.4 °C	27	12	0
July	31.8 °C	22.2 °C	27.1 °C	42.4 °C	15.3 °C	31	23	0
August	31.7 °C	22.3 °C	26.9 °C	40.5 °C	15.4 °C	31	23	0
September	26.7 °C	17.8 °C	22.1 °C	35.8 °C	9.7 °C	21	6	0
October	21.0 °C	13.0 °C	16.8 °C	33.2 °C	3.7 °C	5	0	0
November	15.2 °C	7.9 °C	11.3 °C	25.8 °C	-2.1 °C	0	0	1
December	10.2 °C	3.1 °C	6.3 °C	22.4 °C	-10.4 °C	0	0	6

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	50 mm	7	9.6 h/day	54 %	77 %	11 km/h	13.5 °C
February	48 mm	8	11 h/day	55 %	75 %	12 km/h	12.8 °C
March	61 mm	9	12 h/day	53 %	74 %	12 km/h	13.1 °C
April	57 mm	9	13 h/day	50 %	71 %	12 km/h	14.9 °C
May	66 mm	9	14 h/day	45 %	67 %	12 km/h	18.8 °C
June	46 mm	7	15 h/day	31 %	61 %	12 km/h	23.0 °C
July	41 mm	6	15 h/day	20 %	57 %	12 km/h	25.5 °C
August	40 mm	6	14 h/day	20 %	60 %	11 km/h	26.5 °C
September	49 mm	6	12 h/day	34 %	66 %	11 km/h	24.5 °C
October	59 mm	7	11 h/day	50 %	75 %	10 km/h	21.2 °C
November	58 mm	7	9.9 h/day	59 %	79 %	10 km/h	18.0 °C
December	70 mm	8	9.3 h/day	58 %	80 %	11 km/h	15.2 °C

Where Thessaloníki ranks

Ranking	Position	Value
Warmest sea temperatures in Europe in June	3rd of 50	23 °C
Warmest sea temperatures in Europe in July	5th of 50	26 °C
Warmest sea temperatures in Europe in May	5th of 50	19 °C
Warmest sea temperatures in Europe in August	6th of 50	27 °C
The warmest places in Europe in June	11th of 50	29 °C
The warmest places in Europe in May	12th of 50	24 °C

Planning a trip? See the best time to visit Thessaloníki.

QuestionsCommon questions about Thessaloníki’s climate

When is the best time to visit Thessaloníki?

That depends on what you want, so the honest answer is a comparison rather than a single month. May, September, October sit closest to 20 °C on average, July is the warmest month and August the driest. The month-by-month table above has the full picture.

How hot does Thessaloníki get?

In July, the warmest month, daily highs average 32 °C. About 65 days a year pass 30 °C. The highest value in the 1991–2020 record is 42 °C.

How cold does it get in winter?

Nights average 1.5 °C in January, the coldest month. A normal year has 23 nights below freezing.

Which month is wettest in Thessaloníki?

December, averaging 70 mm over 8 days with rain. The driest month is August with 40 mm. The year as a whole averages 646 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Thessaloníki rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 40.641°, 22.935° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.