Trieste climate

Name: Trieste
Address: IT

Trieste is warmest in August, with average highs of 28 °C, and coldest in January, when nights average 1.2 °C. November is the wettest month (192 mm) and July the driest (88 mm). Figures are 1991–2020 climate normals.

Across a full year Trieste averages 1,489 mm of rain, 72 days above 25 °C and 35 days below freezing.

Italy · 2 m elevation · population 204,338 · 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 August 28 °C
Coldest month January 1.2 °C
Driest month July 88 mm
Wettest month November 192 mm
Least cloud August 41 % cloud
Hottest on record July 36 °C
Coldest on record December -15 °C
Warmest sea August 25 °C

What to expectTrieste through the year

Trieste has a clear annual cycle: average daily highs run from 7.3 °C in January to 28 °C in August, a swing of 19 °C in mean temperature across the year.

Counted across a normal year, 72 days a year reach 25 °C, 17 of them reach 30 °C, 35 nights drop below freezing. The warmest reading in the 1991–2020 record is 36 °C, in July.

Rain is strongly seasonal. November averages 192 mm against 88 mm in July — 2.2 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Trieste is warmest in August at 25 °C and coldest in February at 9.6 °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	7.3 °C	90 mm	62 %
February	8.6 °C	97 mm	57 %
March	12.4 °C	99 mm	55 %
April	16.4 °C	107 mm	56 %
May	20.7 °C	120 mm	56 %
June	24.8 °C	107 mm	50 %
July	27.4 °C	88 mm	42 %
August	27.7 °C	111 mm	41 %
September	22.4 °C	168 mm	50 %
October	17.5 °C	183 mm	58 %
November	12.4 °C	192 mm	67 %
December	8.2 °C	128 mm	61 %

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	7.3 °C	1.2 °C	3.9 °C	16.1 °C	-12.0 °C	0	0	12
February	8.6 °C	1.2 °C	4.7 °C	19.4 °C	-11.6 °C	0	0	10
March	12.4 °C	4.2 °C	8.3 °C	23.4 °C	-12.6 °C	0	0	3
April	16.4 °C	7.9 °C	12.3 °C	26.8 °C	-0.4 °C	0	0	0
May	20.7 °C	12.4 °C	16.7 °C	31.0 °C	4.3 °C	3	0	0
June	24.8 °C	16.5 °C	20.9 °C	35.9 °C	8.3 °C	14	3	0
July	27.4 °C	18.7 °C	23.2 °C	36.4 °C	10.7 °C	24	6	0
August	27.7 °C	19.0 °C	23.3 °C	36.1 °C	9.0 °C	24	8	0
September	22.4 °C	14.8 °C	18.5 °C	31.4 °C	6.6 °C	7	0	0
October	17.5 °C	10.9 °C	14.0 °C	26.8 °C	-0.5 °C	0	0	0
November	12.4 °C	6.6 °C	9.3 °C	23.0 °C	-5.1 °C	0	0	2
December	8.2 °C	2.2 °C	4.9 °C	16.5 °C	-14.9 °C	0	0	8

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	90 mm	9	9.1 h/day	62 %	77 %	17 km/h	10.8 °C
February	97 mm	9	10 h/day	57 %	74 %	17 km/h	9.6 °C
March	99 mm	10	12 h/day	55 %	72 %	17 km/h	10.1 °C
April	107 mm	12	14 h/day	56 %	72 %	16 km/h	13.1 °C
May	120 mm	13	15 h/day	56 %	73 %	15 km/h	17.9 °C
June	107 mm	12	16 h/day	50 %	72 %	15 km/h	22.5 °C
July	88 mm	10	15 h/day	42 %	68 %	15 km/h	25.0 °C
August	111 mm	10	14 h/day	41 %	68 %	15 km/h	25.4 °C
September	168 mm	11	13 h/day	50 %	74 %	16 km/h	22.6 °C
October	183 mm	13	11 h/day	58 %	79 %	17 km/h	19.3 °C
November	192 mm	13	9.5 h/day	67 %	81 %	17 km/h	16.2 °C
December	128 mm	10	8.7 h/day	61 %	79 %	17 km/h	13.2 °C

How Trieste compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Trieste	28 °C	1.2 °C	1,489 mm	72
Ljubljana · Slovenia	25 °C	-3.1 °C	1,175 mm	47
Padua · Italy	29 °C	-0.3 °C	979 mm	88
Zagreb · Croatia	27 °C	-2.4 °C	882 mm	72

Where Trieste ranks

Ranking	Position	Value
Warmest sea temperatures in Europe in June	9th of 50	23 °C
Warmest sea temperatures in Europe in July	12th of 50	25 °C
Warmest sea temperatures in Europe in August	24th of 50	25 °C
Warmest sea temperatures in Europe in May	27th of 50	18 °C
Warmest sea temperatures in Europe in September	33rd of 50	23 °C
Warmest sea temperatures in Europe year-round	37th of 50	17 °C

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

QuestionsCommon questions about Trieste’s climate

When is the best time to visit Trieste?

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

How hot does Trieste get?

In August, the warmest month, daily highs average 28 °C. About 17 days a year pass 30 °C. The highest value in the 1991–2020 record is 36 °C.

How cold does it get in winter?

Nights average 1.2 °C in January, the coldest month. A normal year has 35 nights below freezing.

Which month is wettest in Trieste?

November, averaging 192 mm over 13 days with rain. The driest month is July with 88 mm. The year as a whole averages 1,489 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 Trieste 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: 45.650°, 13.777° , 2 m above sea level (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.