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Contents
- The climate of Portorož
- The best time to visit Portorož
- The worst time to visit Portorož
- Spring weather in Portorož
- Summer weather in Portorož
- Autumn weather in Portorož
- Winter weather in Portorož
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average humidity
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average UV index
The climate of Portorož
Situated on Slovenia's Adriatic Sea coast, Portorož boasts a climate that is often classified as Cfb or a marine west coast, warm summer climate according to the Köppen climate classification. This unique climate combination arises due to the town's strategic geographic location, influenced by maritime and continental weather patterns.
Analyzing the annual weather parameters, a pattern of moderate temperature changes becomes evident. The overall weather during the year is relatively mild, marked by moderate winter temperatures and warm but bearable summer temperatures.
Focusing on the specifics of weather parameters, the highest average high temperature climbs to 28.4°C (83.1°F) in July, while the lowest average low temperature drops to 0.4°C (32.7°F) in February. The rainfall appears to be most significant from September to November, with the heaviest shower round reaching 124mm (4.88") in September. Days with rainfall are pretty consistent throughout the year, fluctuating from 7.5 days in February to 11 days in May.
Analyzing the annual weather parameters, a pattern of moderate temperature changes becomes evident. The overall weather during the year is relatively mild, marked by moderate winter temperatures and warm but bearable summer temperatures.
Focusing on the specifics of weather parameters, the highest average high temperature climbs to 28.4°C (83.1°F) in July, while the lowest average low temperature drops to 0.4°C (32.7°F) in February. The rainfall appears to be most significant from September to November, with the heaviest shower round reaching 124mm (4.88") in September. Days with rainfall are pretty consistent throughout the year, fluctuating from 7.5 days in February to 11 days in May.
The best time to visit Portorož
The most enjoyable time to visit Portorož is arguably between May and September when the average high temperatures range from 21.8°C (71.2°F) to 28.4°C (83.1°F). These months also bring forth the highest average sea temperatures, from 18°C (64.4°F) in May, peaking at 24.8°C (76.6°F) in July and August, and declining to 23.3°C (73.9°F) in September. Despite a higher probability of rain in this period, a burst of plentiful sunshine ensures pleasant conditions. The many bright hours during this period, reaching a peak of 10.2 sunshine hours in July, compensate well for the occasional showers.
The worst time to visit Portorož
On the far end of the spectrum, from December to February, Portorož experiences the coldest temperatures of the year. The average high temperatures during these months range from 8.6°C (47.5°F) to 9.7°C (49.5°F). The sea temperature also significantly decreases, reaching a low of 9.3°C (48.7°F) in February. While daylight hours during this time dip to their shortest, with 8.8 hours in December, the sunshine hours also decline to the lowest, showing only 3 hours in December and February. Thus, it might be prudent to avoid these cold, less sunny months.
Spring weather in Portorož
Spring in Portorož features a gradual increase in temperatures, from an average high of 13.1°C (55.6°F) in March to 21.8°C (71.2°F) in May. The average low-temperature range for spring falls from 3.1°C (37.6°F) to 11°C (51.8°F). A steady rise in sea temperature from 10.1°C (50.2°F) to 18°C (64.4°F) occurs simultaneously with this warm-up on land. Despite a slight increase in rainfall, daylight increases, and higher UV indexes in the spring welcome visitors with open arms.
Summer weather in Portorož
Summers in Portorož are warm and comfortable with temperatures averaging between 21.8°C (71.2°F) and 28.4°C (83.1°F). The lowest average temperature during this season is around 14.5°C (58.1°F) in June. Sea temperatures peak to a comfortable 24.8°C (76.6°F) in July and August, perfect for water-based activities. Although rainfall is relatively higher, with a peak of 86mm (3.39") in June, the abundant sunlight balances the weather conditions.
Autumn weather in Portorož
Autumn sees a progressive drop in temperature, ranging from an average high of 23.9°C (75°F) in September to 13.2°C (55.8°F) by November. Similarly, the average low temperature drops from 13°C (55.4°F) to 4.7°C (40.5°F). Although the sea temperature remains warm in early autumn, it slowly cools down, reaching 16.1°C (61°F) by November. Rainfall becomes significantly high during this season, making it slightly less preferable for tourism.
Winter weather in Portorož
The cold air rolls into Portorož in winter with average high temperatures plummeting to a range from 8.6°C (47.5°F) to 9.7°C (49.5°F) from December to February. The average low temperature hovers between 0.6°C (33.1°F) and 1.4°C (34.5°F) during this period, making it the chilliest time of the year. The sea temperature also takes a chilly dip, reaching its lowest at 9.3°C (48.7°F) in February. In these months, the duration of daylight and sunshine hours are at their shortest, speaking to the town's true winter character. Despite this, rainfall decreases and the relative air humidity settles at a comfortable midpoint, offering a spark of warmth in the cold months.
Weather in January
Sitting at winter's core, January brings chilly days to Portorož. Compared to December, daytime temperatures reach up to 8.6°C (47.5°F) whilst the nighttime temperatures plummet down to a frigid 0.6°C (33.1°F). With cold temperatures, it is imperative to bring heavy clothing. Weather in January »
Weather in February
February witnesses a slight rise in temperatures compared to January, bringing a bit more comfort for those who find January's chilliness a bit too cold. Cold winds still blow across Portorož but it is the month with the lowest rainfall, considering a total precipitation of 47mm (1.85") compared to other winter months. Weather in February »
Weather in March
March announces the start of Spring in Portorož, with the weather gradually warming up. The increase in temperature to a welcoming 13.1°C (55.6°F) during the day and an overnight low of 3.1°C (37.6°F) marks the departure from the winter chill. Weather in March »
Weather in April
April exhibits a further rise in temperature, but it is the increase in rainfall to 65mm (2.56") that characterizes this month’s weather in Portorož. It's a month to brace for intermittent showers while enjoying the increased sunlight hours. Weather in April »
Weather in May
May serves as a prelude to the summer season in Portorož with daily temperatures soaring to a comfortable 21.8°C (71.2°F). It's a time of predominantly clear skies with increased daylight making it suitable for outdoor enthusiasts. Weather in May »
Weather in June
June is the harbinger of summer in Portorož, boasting about the year’s highest sea temperatures, reaching 22.8°C (73°F), inviting beach enthusiasts into the water. The pleasant weather conditions continue throughout the month despite the variables of rain and humidity. Weather in June »
Weather in July
July basks in the heart of summer with scorching heat across Portorož, marking the highest temperature spike hitting 28.4°C (83.1°F). Despite the heat, the city enjoys the year's highest average sunlight with 10.2 hours a day. The summer weather prompts visitors to dip into the cool sea water, as the beach season hits full swing. Weather in July »
Weather in August
In August, Portorož continues to experience high summer heat with temperatures closely mirroring those of July. In spite of being one of the hottest months, it’s traced with frequent rainfall, averaging about 78mm (3.07"). It's a peak season for tourists, so expect busy streets, full hotels, and populated beaches. Weather in August »
Weather in September
September marks the departure of summer with the onset of cooler autumn conditions. The rainfall jumps to its yearly peak at 124mm (4.88"), dipping temperatures a considerable margin. You can notice the daylight hours and sunshine slowly decreasing as the autumn progresses. Weather in September »
Weather in October
October intensifies the arrival of autumn in Portorož, reinforcing the conditions set by September. As temperatures begin to get cooler, fall foliage starts to spring around the city. Despite a higher monthly average rainfall than September, October still caters to outdoor activities. Weather in October »
Weather in November
November hosts the fall's finale with a rapid decrease in temperatures, sliding to 4.7°C (40.5°F) in the nights. The daylight hours are noticeably shorter, coupled with cooler temperatures pointing towards the approaching winter. Weather in November »
Weather in December
December, with temperatures dropping to 1.4°C (34.5°F) at night, signals the commencement of winter in Portorož. It's a month of minimal sunlight hours, making it the year’s darkest with the least average sunshine. With a significant dip in sea temperature, swimming activities take a back seat for the majority. Weather in December »
[Resources]Frequently asked questions
What part of the year is the coldest in Portorož?
January, recording an average high temperature of 8.6°C (47.5°F) and a low temperature of 0.6°C (33.1°F), is Portorož's coldest month.
What is the most humid month in Portorož?
The most humid month in Portorož, Slovenia, is January, with an average relative humidity of 68%.
How many days does it rain in Portorož?
In Portorož, during the entire year, the rain falls for 113.1 days and collects up to 931mm (36.65") of precipitation.
When is the lowest UV index in Portorož?
The months with the lowest UV index in Portorož are January, November and December, with an average maximum UV index of 1.
What is the driest month in Portorož?
The month with the least rainfall is February, when the rain falls for 7.5 days and typically collects 47mm (1.85") of precipitation.
What is the month with the coldest sea water in Portorož?
February is the month with the coldest seawater, with an average sea temperature of 9.3°C (48.7°F).
When are the longest days in Portorož?
The month with the longest days in Portorož, Slovenia, is June, with an average of 15h and 36min of daylight.
What are the months with the highest UV index in Portorož?
The months with the highest UV index are June and July, with an average maximum UV index of 8.
What are the warmest months in Portorož?
With average high and low temperatures of 28.4°C (83.1°F) and 16.5°C (61.7°F) respectively, July is Portorož's warmest month.
What is the least humid month in Portorož?
With an average relative humidity of 50%, July is the least humid month in Portorož, Slovenia.
What months are the sea warmest in Portorož?
The months with the warmest seawater are July and August, with an average sea temperature of 24.8°C (76.6°F).
What month has the most sunshine in Portorož?
July has the most sunshine of the year in Portorož, with an average of 10.2h of sunshine.
What is the rainiest month in Portorož?
September is the month with the most rainfall. Rain falls for 8.5 days and accumulates 124mm (4.88") of precipitation.
When is Daylight Saving Time (DST) in Portorož?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends in Portorož, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
What is the month with the shortest days in Portorož?
The month with the shortest days in Portorož, Slovenia, is December, with an average of 8h and 48min of daylight.
What is the month with the least sunshine in Portorož?
December has the least sunshine of the year, with an average of 3h of sunshine.
Average temperature
Portorož, Slovenia
The warmest month (with the highest average high temperature) is July (28.4°C).
The month with the lowest average high temperature is January (8.6°C).
The month with the highest average low temperature is July (16.5°C).
The coldest month (with the lowest average low temperature) is February (0.4°C).
Average humidity
Portorož, Slovenia
The month with the highest relative humidity is January (68%).
The month with the lowest relative humidity is July (50%).
Average rainfall
Portorož, Slovenia
- Average rainfall in January:
56.3mm - Average rainfall in February:
47.1mm - Average rainfall in March:
61.3mm - Average rainfall in April:
65.3mm - Average rainfall in May:
68.8mm - Average rainfall in June:
85.8mm
- Average rainfall in July:
57.6mm - Average rainfall in August:
78.1mm - Average rainfall in September:
123.8mm - Average rainfall in October:
120.5mm - Average rainfall in November:
91.3mm - Average rainfall in December:
75.3mm
The wettest month (with the highest rainfall) is September (123.8mm).
The driest month (with the least rainfall) is February (47.1mm).
Average rainfall days
Portorož, Slovenia
- Average rainfall days in January:
10.1 days - Average rainfall days in February:
7.5 days - Average rainfall days in March:
8.4 days - Average rainfall days in April:
10.2 days - Average rainfall days in May:
11 days - Average rainfall days in June:
10.9 days
- Average rainfall days in July:
7.6 days - Average rainfall days in August:
7.6 days - Average rainfall days in September:
8.5 days - Average rainfall days in October:
10.2 days - Average rainfall days in November:
10.7 days - Average rainfall days in December:
10.4 days
The month with the highest number of rainy days is May (11 days).
The month with the least rainy days is February (7.5 days).
Average sea temperature
Portorož, Slovenia
The best months for swimming (with the highest average sea temperature) are July and August (24.8°C).
The coldest month (with the lowest average sea temperature) is February (9.3°C).
Average daylight / Average sunshine
Portorož, Slovenia
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 3min - Average daylight in May:
14h and 5min - Average daylight in June:
15h and 4min
- Average daylight in July:
15h and 2min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 3min - Average daylight in December:
8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January:
3h and 2min - Average sunshine in February:
4h and 4min - Average sunshine in March:
5h and 3min - Average sunshine in April:
6h and 3min - Average sunshine in May:
8h and 1min - Average sunshine in June:
9h and 1min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 4min - Average sunshine in September:
7h and 2min - Average sunshine in October:
5h and 2min - Average sunshine in November:
3h and 4min - Average sunshine in December:
3h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 0min).
Average UV index
Portorož, Slovenia
The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are January, November and December (UV index 1).
Portorož, Slovenia
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