Climate - Portoroz (Slovenia)

The climate of Portoroz can be described as transitional Mediterranean.
Portorož (or Portorose) is located in the short coastal stretch of Slovenian, about 20 km (12 mi) south-west of Trieste. The sea mitigates the climate, but we are in the area where the bora can blow, the cold, dry wind from the eastern European plains.
The average temperature of the coldest month (January) is of 5.3 °C (41 °F), that of the warmest month (July) is of 23.4 °C (74 °F). Here are the average temperatures.

Precipitation amounts to 950 millimeters (37.4 inches) per year: so, it is at an intermediate level. It ranges from 50 mm (2 in) in the driest month (January) to 125 mm (4.9 in) in the wettest (November). Here is the average precipitation.

On average, there are around 2,415 sunshine hours per year. Here are the average sunshine hours per day.

The sea temperature ranges from 10.5 °C (51 °F) in February to 25.5 °C (78 °F) in August. The sea is warm enough for swimming from July to September. Here are the average sea temperatures.

Weather by month

Based on the period 1991 - 2020.
(January - February - March - April - May - June - July - August - September - October - November - December)

In January, the coldest month of the year, the average temperature is 5.3 °C (41.5 °F), with a minimum of 1.3 °C (34.4 °F) and a maximum of 9.2 °C (48.6 °F).
On the coldest nights of the month, the temperature typically drops to -5 °C (23 °F). However, it dropped to -9.5 °C (15 °F) in January 2000.
On the mildest days of the month, the temperature typically reaches 14.5 °C (58 °F). However, it reached 18 °C (65 °F) in January 2014.
Precipitation amounts to 50 millimeters (2 inches), spread over 6 days.
On average, there are 104 hours of sunshine per month, ie 3.4 hours per day.
The average sea temperature is of 11.5 °C (53 °F).

In February, the average temperature is 5.8 °C (42.4 °F), with a minimum of 1.2 °C (34.2 °F) and a maximum of 10.3 °C (50.6 °F).
On the coldest nights of the month, the temperature typically drops to -4.5 °C (24 °F). However, it dropped to -10.5 °C (13 °F) in February 1991.
On the mildest days of the month, the temperature typically reaches 15.5 °C (60 °F). However, it reached 19 °C (67 °F) in February 2006.
Precipitation amounts to 60 millimeters (2.4 inches), spread over 6 days.
On average, there are 133 hours of sunshine per month, ie 4.7 hours per day.
The average sea temperature is of 10.5 °C (51 °F).

In March, the average temperature is 9.1 °C (48.4 °F), with a minimum of 4.1 °C (39.3 °F) and a maximum of 14.1 °C (57.4 °F).
On the coldest nights of the month, the temperature typically drops to -2 °C (28 °F). However, it dropped to -10.5 °C (13 °F) in March 2005.
On the mildest days of the month, the temperature typically reaches 19.5 °C (67 °F). However, it reached 23 °C (74 °F) in March 2017.
Precipitation amounts to 55 millimeters (2.2 inches), spread over 6 days.
On average, there are 187 hours of sunshine per month, ie 6 hours per day.
The average sea temperature is of 11 °C (52 °F).

In April, the average temperature is 12.9 °C (55.2 °F), with a minimum of 7.6 °C (45.7 °F) and a maximum of 18.1 °C (64.6 °F).
On the coldest nights of the month, the temperature typically drops to 1.5 °C (35 °F). However, it dropped to -4 °C (24 °F) in April 2003.
On the warmest days of the month, the temperature typically reaches 24 °C (76 °F). However, it reached 28 °C (83 °F) in April 2018.
Precipitation amounts to 65 millimeters (2.6 inches), spread over 8 days.
On average, there are 210 hours of sunshine per month, ie 7 hours per day.
The average sea temperature is of 13.5 °C (57 °F).

In May, the average temperature is 17.2 °C (63 °F), with a minimum of 11.8 °C (53.2 °F) and a maximum of 22.7 °C (72.9 °F).
On the coldest nights of the month, the temperature typically drops to 6.5 °C (44 °F). However, it dropped to 3.5 °C (38 °F) in May 2011.
On the warmest days of the month, the temperature typically reaches 28 °C (83 °F). However, it reached 33 °C (92 °F) in May 2008.
Precipitation amounts to 75 millimeters (3 inches), spread over 8 days.
On average, there are 263 hours of sunshine per month, ie 8.5 hours per day.
The average sea temperature is of 18 °C (65 °F).

In June, the average temperature is 21.3 °C (70.3 °F), with a minimum of 15.5 °C (59.9 °F) and a maximum of 27 °C (80.6 °F).
On the coldest nights of the month, the temperature typically drops to 10.5 °C (51 °F). However, it dropped to 6.5 °C (44 °F) in June 2011.
On the warmest days of the month, the temperature typically reaches 32.5 °C (90 °F). However, it reached 35.5 °C (96 °F) in June 2019.
Precipitation amounts to 75 millimeters (3 inches), spread over 6 days.
On average, there are 292 hours of sunshine per month, ie 9.7 hours per day.
The average sea temperature is of 22.5 °C (72 °F).

In July, the warmest month of the year, the average temperature is 23.4 °C (74.1 °F), with a minimum of 17.4 °C (63.2 °F) and a maximum of 29.4 °C (85 °F).
On the coldest nights of the month, the temperature typically drops to 12.5 °C (54 °F). However, it dropped to 9 °C (48 °F) in July 2007.
On the warmest days of the month, the temperature typically reaches 34 °C (94 °F). However, it reached 37.5 °C (99 °F) in July 2015.
Precipitation amounts to 60 millimeters (2.4 inches), spread over 5 days.
On average, there are 335 hours of sunshine per month, ie 10.8 hours per day.
The average sea temperature is of 25 °C (77 °F).

In August, the average temperature is 23.4 °C (74.1 °F), with a minimum of 17.3 °C (63.1 °F) and a maximum of 29.5 °C (85 °F).
On the coldest nights of the month, the temperature typically drops to 11.5 °C (53 °F). However, it dropped to 7.5 °C (46 °F) in August 2005.
On the warmest days of the month, the temperature typically reaches 33.5 °C (93 °F). However, it reached 37.5 °C (99 °F) in August 2017.
Precipitation amounts to 70 millimeters (2.8 inches), spread over 6 days.
On average, there are 314 hours of sunshine per month, ie 10.1 hours per day.
The average sea temperature is of 25.5 °C (78 °F).

In September, the average temperature is 19.1 °C (66.4 °F), with a minimum of 13.7 °C (56.6 °F) and a maximum of 24.6 °C (76.2 °F).
On the coldest nights of the month, the temperature typically drops to 8 °C (47 °F). However, it dropped to 5 °C (41 °F) in September 2008.
On the warmest days of the month, the temperature typically reaches 29.5 °C (85 °F). However, it reached 32.5 °C (91 °F) in September 2016.
Precipitation amounts to 120 millimeters (4.7 inches), spread over 8 days.
On average, there are 221 hours of sunshine per month, ie 7.4 hours per day.
The average sea temperature is of 23 °C (73 °F).

In October, the average temperature is 14.9 °C (58.8 °F), with a minimum of 10.2 °C (50.3 °F) and a maximum of 19.6 °C (67.3 °F).
On the coldest nights of the month, the temperature typically drops to 3 °C (37 °F). However, it dropped to -2 °C (29 °F) in October 2003.
On the warmest days of the month, the temperature typically reaches 24.5 °C (76 °F). However, it reached 27.5 °C (82 °F) in October 2000.
Precipitation amounts to 105 millimeters (4.1 inches), spread over 8 days.
On average, there are 163 hours of sunshine per month, ie 5.3 hours per day.
The average sea temperature is of 19.5 °C (67 °F).

In November, the average temperature is 10.5 °C (50.9 °F), with a minimum of 6.6 °C (43.8 °F) and a maximum of 14.5 °C (58 °F).
On the coldest nights of the month, the temperature typically drops to -1 °C (30 °F). However, it dropped to -5 °C (23 °F) in November 1995.
On the mildest days of the month, the temperature typically reaches 20 °C (68 °F). However, it reached 24.5 °C (76 °F) in November 2004.
Precipitation amounts to 125 millimeters (4.9 inches), spread over 9 days.
On average, there are 95 hours of sunshine per month, ie 3.2 hours per day.
The average sea temperature is of 16.5 °C (62 °F).

In December, the average temperature is 6.4 °C (43.5 °F), with a minimum of 2.4 °C (36.3 °F) and a maximum of 10.3 °C (50.6 °F).
On the coldest nights of the month, the temperature typically drops to -4.5 °C (24 °F). However, it dropped to -10 °C (14 °F) in December 2009.
On the mildest days of the month, the temperature typically reaches 15.5 °C (60 °F). However, it reached 19 °C (66 °F) in December 2014.
Precipitation amounts to 80 millimeters (3.1 inches), spread over 7 days.
On average, there are 96 hours of sunshine per month, ie 3.1 hours per day.
The average sea temperature is of 14 °C (57 °F).

Best Time

The best periods to visit Portoroz are spring and autumn, and in particular, from mid-April to mid-June and in the month of September. However, in both periods, some rainy days are possible.
The best months to go to the beach are July and August. In June, the sea is still a little cool.