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Monthly climate in Portoroz, Piran-Pirano, Slovenia

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Portoroz features a oceanic climate (Cfb).Temperatures typically range between 7 °C (46 °F) and 26 °C (78 °F) through the year, but rarely can drop to -3 °C (27 °F) or can rise to as high as 30 °C (87 °F).The average annual precipitation amounts to about 1193 mm (47.0 inches) and receives 109 rainy days on the 1 mm (0.04 inches) threshold annually.Portoroz enjoys an average of 3733 hours of sunshine throughout the year, and daylight varies from 8 hours 45 minutes to 15 hours 35 minutes per day.

Monthly average temperatures in Portoroz, Piran-Pirano, Slovenia §

The warmest months in Portoroz are June, July and August, with daily mean temperatures ranging from 23 to 26 °C (73 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 10 °C (46 - 50 °F) throughout the day. On average each year, Portoroz experiences 54 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Portoroz, Piran-Pirano, Slovenia.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 13°C
(56°F)		 13°C
(56°F)		 16°C
(62°F)		 20°C
(68°F)		 24°C
(76°F)		 30°C
(86°F)		 29°C
(85°F)		 30°C
(87°F)		 28°C
(82°F)		 23°C
(73°F)		 19°C
(67°F)		 16°C
(60°F)
Mean maximum 12°C
(54°F)		 12°C
(54°F)		 15°C
(58°F)		 17°C
(63°F)		 22°C
(71°F)		 26°C
(80°F)		 28°C
(83°F)		 29°C
(85°F)		 26°C
(80°F)		 22°C
(72°F)		 18°C
(64°F)		 14°C
(58°F)
Average high 9°C
(48°F)		 9°C
(49°F)		 11°C
(52°F)		 14°C
(58°F)		 19°C
(66°F)		 24°C
(75°F)		 26°C
(79°F)		 27°C
(81°F)		 23°C
(74°F)		 19°C
(66°F)		 14°C
(58°F)		 11°C
(51°F)
Daily mean 7°C
(46°F)		 8°C
(47°F)		 10°C
(50°F)		 13°C
(56°F)		 17°C
(64°F)		 23°C
(73°F)		 25°C
(77°F)		 26°C
(78°F)		 22°C
(71°F)		 17°C
(64°F)		 13°C
(56°F)		 10°C
(50°F)
Average low 6°C
(44°F)		 7°C
(45°F)		 8°C
(47°F)		 12°C
(53°F)		 16°C
(61°F)		 21°C
(71°F)		 23°C
(74°F)		 24°C
(76°F)		 20°C
(68°F)		 16°C
(61°F)		 12°C
(54°F)		 9°C
(48°F)
Mean minimum 3°C
(38°F)		 3°C
(37°F)		 4°C
(39°F)		 7°C
(46°F)		 12°C
(54°F)		 17°C
(64°F)		 20°C
(69°F)		 20°C
(68°F)		 15°C
(59°F)		 12°C
(55°F)		 7°C
(46°F)		 5°C
(41°F)
Minimum -3°C
(27°F)		 -3°C
(27°F)		 -3°C
(27°F)		 5°C
(42°F)		 10°C
(50°F)		 16°C
(61°F)		 20°C
(68°F)		 17°C
(63°F)		 14°C
(57°F)		 11°C
(52°F)		 6°C
(42°F)		 4°C
(39°F)

Compare climate in Portoroz with other places

Compare temperature, precipitation, sunshine, UV index in Portoroz, Piran-Pirano, Slovenia with other places around the world.

Monthly average precipitation in Portoroz, Piran-Pirano, Slovenia §

Portoroz usually has the most precipitation in September, November and December, with an average of 12 rainy days and 168 mm (6.6 inches) of precipitation per month.The driest months in Portoroz are January, March and July. On average, 55 mm (2.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Portoroz, Piran-Pirano, Slovenia.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 58 (2.3) 106 (4.2) 57 (2.3) 86 (3.4) 105 (4.2) 68 (2.7) 49 (1.9) 58 (2.3) 171 (6.7) 100 (4.0) 183 (7.2) 150 (5.9)
Average precipitation days (≥ 1 mm) 7 11 7 8 13 5 6 6 10 10 13 13

Monthly sunshine hours in Portoroz, Piran-Pirano, Slovenia §

The sunniest months in Portoroz are June, July and August, when the sun shines an average of 13 hours 31 minutes a day.Least sunny months in Portoroz: January, February and December receive an average of 6 hours 43 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Portoroz, Piran-Pirano, Slovenia.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 181 223 314 344 371 417 429 396 325 292 228 206
Mean daily daylight hours 9h 9m 10h 23m 11h 56m 13h 32m 14h 54m 15h 35m 15h 13m 14h 1m 12h 29m 10h 53m 9h 29m 8h 45m

Solar UV radiation in Portoroz, Piran-Pirano, Slovenia §

Portoroz experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the Very High category of sun exposure.January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Portoroz UV Index data.

Average daily maximum UV levels by month for Portoroz, Piran-Pirano, Slovenia.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 3 5 6 8 9 9 8 7 5 3 2