Postojna Weather in April
April in Postojna brings moderate temperatures around 15°C (59°F) during the day, dropping to 5°C (41°F) at night, with quite a bit of rainfall expected, averaging around 129 mm (5.1 in) for the month.
Rainfall in Postojna in April
The climate data from previous years indicates about 16 days of rain, averaging 129 mm (5.1 in) for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Postojna in April
April in Postojna sees highs of 15°C (59°F) and lows of 5°C (41°F) overnight. The difference between afternoon and evening temperatures is usually noticeable. Nights drop to 5°C (41°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Postojna in April
The month brings about 178 hours of sunlight, offering a comfortable mix of sun and overcast.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July and August typically offer the best weather for Postojna.
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 Postojna's climate page.
Postojna Temperature in April
Min Temperature
5°C (41°F)
Max Temperature
15°C (59°F)
Chance of Rain
55%
Precipitation
129 mm (5.1 in)
Rainy days
16 days
Humidity
63% *
Sunshine
178 hours *
Percentage Sunshine
46% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Postojna typically stay consistent throughout April, with daily highs averaging around 15°C (59°F). Nights are cold, with lows typically ranging from 5°C (41°F) to 8°C (46°F).
Average temperatures in April
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 April
Historical weather for Postojna in April
Browse day-by-day weather records for Postojna spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Postojna historical weather extremes in April
Based on 50 years of weather observations in Postojna between 1976 and 2026, these are the recorded extremes.
- On April 28, 2012, temperatures climbed to 28°C (82°F), marking the warmest April day on record.
- The coldest April day was on April 23, 2024, with a maximum of 2°C (36°F).
- The lowest overnight temperature recorded in April was -11°C (12°F) (April 7, 2021).
Best Places in Slovenia in April
Find out more about the weather in Slovenia and which places have the best travel conditions in this month. See all of Slovenia in April →
perfect weather
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tolerable
unpleasant
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What to Wear in Postojna in April
The weather can be unpredictable in April, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Postojna in April
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 Postojna's climate page.
Temperature Rainfall Sunshine Humidity
See the full Postojna climate overview or explore weather in Slovenia.
