Portorož Weather in May
May in Portorož typically sees daytime highs of 21°C (70°F) and nighttime lows of 15°C (59°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Portorož in May
Climate statistics over the past 30 years suggest around 14 days of rain, with 93 mm (3.7 in) average for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Portorož in May
If you're visiting Portorož in May, expect perfect temperatures with highs of 21°C (70°F) and overnight lows of 15°C (59°F). The difference between afternoon and evening temperatures is usually noticeable. Nights cool down to 15°C (59°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Portorož in May
There are approximately 256 hours of sunshine this month, resulting in mostly clear days.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Slovenia, check out our Portorož's climate page.
Portorož Temperature in May
Min Temperature
15°C (59°F)
Max Temperature
21°C (70°F)
Chance of Rain
46%
Precipitation
93 mm (3.7 in)
Rainy days
14 days
Humidity
54%
Sunshine
256 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Portorož typically rise from around 21°C (70°F) at the start of May to approximately 24°C (75°F) by the end. Nights are cool, with lows typically ranging from 10°C (50°F) to 14°C (57°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Portorož in May
Browse day-by-day weather records for Portorož spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Portorož historical weather extremes in May
Our historical data for Portorož spans 1976 to 2025, revealing these weather extremes.
- The warmest day in May was on May 29, 2008, with a maximum of 33°C (91°F).
- On May 4, 1981, Portorož saw its coldest May day with temperatures maxing out at 10°C (50°F).
- Nighttime temperatures dropped to 3°C (37°F) on May 6, 1981, marking the coldest May night on record.
Best Places in Slovenia in May
Find out more about the weather in Slovenia and which places have the best travel conditions in this month. See all of Slovenia in May →
perfect weather
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tolerable
unpleasant
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What to Wear in Portorož in May
Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Portorož in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Slovenia, check out our Portorož's climate page.
Temperature Rainfall Sunshine Humidity
See the full Portorož climate overview or explore weather in Slovenia.
