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Monthly climate in Istria, Romania

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Istria features a humid subtropical climate (Cfa). Temperatures typically range between 2 °C (37 °F) and 25 °C (76 °F) through the year, but rarely can drop to -12 °C (11 °F) or can rise to as high as 32 °C (90 °F). The average annual precipitation amounts to about 508 mm (20.0 inches) and receives 82 rainy days on the 1 mm (0.04 inches) threshold annually. Istria enjoys an average of 3750 hours of sunshine throughout the year, and daylight varies from 8 hours 52 minutes to 15 hours 29 minutes per day.

Monthly average temperatures in Istria, Romania

The warmest months in Istria are June, July and August, with daily mean temperatures ranging from 21 to 25 °C (71 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 6 °C (37 - 43 °F) throughout the day. On average each year, Istria experiences 58 days above 25 °C (77.0 °F) and 26 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Istria. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(56°F)		14°C
(58°F)		17°C
(63°F)		21°C
(69°F)		25°C
(77°F)		29°C
(85°F)		32°C
(89°F)		32°C
(90°F)		29°C
(84°F)		24°C
(76°F)		20°C
(69°F)		16°C
(60°F)
Mean maximum10°C
(51°F)		12°C
(54°F)		15°C
(58°F)		17°C
(64°F)		23°C
(74°F)		27°C
(81°F)		30°C
(86°F)		30°C
(87°F)		27°C
(82°F)		22°C
(72°F)		17°C
(63°F)		13°C
(56°F)
Average high4°C
(40°F)		6°C
(44°F)		8°C
(47°F)		13°C
(55°F)		19°C
(66°F)		24°C
(75°F)		26°C
(79°F)		27°C
(81°F)		23°C
(74°F)		17°C
(64°F)		12°C
(53°F)		8°C
(46°F)
Daily mean2°C
(37°F)		4°C
(40°F)		6°C
(43°F)		10°C
(51°F)		16°C
(61°F)		21°C
(71°F)		24°C
(75°F)		25°C
(76°F)		20°C
(69°F)		15°C
(59°F)		10°C
(50°F)		6°C
(43°F)
Average low0°C
(33°F)		2°C
(36°F)		4°C
(39°F)		8°C
(46°F)		14°C
(57°F)		19°C
(67°F)		21°C
(70°F)		22°C
(72°F)		18°C
(64°F)		13°C
(55°F)		8°C
(47°F)		4°C
(39°F)
Mean minimum-6°C
(21°F)		-5°C
(24°F)		-2°C
(29°F)		3°C
(38°F)		10°C
(50°F)		15°C
(59°F)		17°C
(64°F)		18°C
(65°F)		12°C
(54°F)		8°C
(46°F)		2°C
(36°F)		-2°C
(29°F)
Minimum-12°C
(11°F)		-7°C
(19°F)		-10°C
(15°F)		2°C
(36°F)		9°C
(48°F)		11°C
(52°F)		16°C
(61°F)		16°C
(61°F)		9°C
(49°F)		6°C
(43°F)		-2°C
(29°F)		-5°C
(22°F)

Compare climate in Istria with other places

Compare temperature, precipitation, sunshine, UV index in Istria, Romania with other places around the world.

Monthly average precipitation in Istria, Romania

Istria usually has the most precipitation in June, November and December, with an average of 10 rainy days and 61 mm (2.4 inches) of precipitation per month. The driest months in Istria are April, August and September. On average, 22 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Istria. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)46 (1.8)42 (1.7)42 (1.7)30 (1.2)35 (1.4)73 (2.9)47 (1.9)14 (0.6)22 (0.9)46 (1.8)48 (1.9)63 (2.5)
Average precipitation days (≥ 1 mm)77767117335712

Monthly sunshine hours in Istria, Romania

The sunniest months in Istria are May, June and July, when the sun shines an average of 13 hours 41 minutes a day. Least sunny months in Istria: January, November and December receive an average of 6 hours 9 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Istria. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours157229301352407417433407343292214193
Mean daily daylight hours9h 14m10h 26m11h 56m13h 29m14h 48m15h 29m15h 7m13h 57m12h 28m10h 56m9h 34m8h 52m

Solar UV radiation in Istria, Romania

Istria 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 Istria UV Index data.

Average daily maximum UV levels by month for Istria. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235789987532