Monthly Climate
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Best time to visit Trieste

September is the best time to visit Trieste for general sightseeing, with average highs of 22 °C and about 11 wet days. The comfortable season runs roughly May to September. The sea stays above 20 °C from June to September.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking September comfort 88/100
A beach holiday August sea 25 °C
The least cloud August 41 % average cloud cover
The least rain July 88 mm
Warmth August 28 °C
Cooler weather January 7.3 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 September 88 22 °C 11 68
2 May 85 21 °C 13 42
3 June 85 25 °C 12 75
4 July 79 27 °C 10 85
5 August 78 28 °C 10 86
6 October 74 17 °C 13 36
7 April 71 16 °C 12 16
8 March 57 12 °C 10 12
9 November 52 12 °C 13 12
10 February 42 8.6 °C 9 13
11 December 38 8.2 °C 10 10
12 January 37 7.3 °C 9 12

For a beach holiday

August scores highest, with a sea temperature of 25 °C and air temperatures around 28 °C. The sea is above 20 °C from June to September.

Month Sea Air Sunshine Beach score
January 11 °C 7.3 °C 62 % 12
February 9.6 °C 8.6 °C 57 % 13
March 10 °C 12 °C 55 % 12
April 13 °C 16 °C 56 % 16
May 18 °C 21 °C 56 % 42
June 23 °C 25 °C 50 % 75
July 25 °C 27 °C 42 % 85
August 25 °C 28 °C 41 % 86
September 23 °C 22 °C 50 % 68
October 19 °C 17 °C 58 % 36
November 16 °C 12 °C 67 % 12
December 13 °C 8.2 °C 61 % 10

When to think twice

January scores lowest with about 9 wet days and highs near 7.3 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

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 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. 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.