Postojna Weather in August
August in Postojna averages 26°C (79°F) during the day and 15°C (59°F) at night. Quite a bit of rainfall is typical this month, with around 144 mm (5.7 in) on average. An umbrella is a good idea.
Rainfall in Postojna in August
You can expect rain on around 14 days based on historical patterns, with 144 mm (5.7 in) average for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Postojna in August
August in Postojna sees highs of 26°C (79°F) and lows of 15°C (59°F) overnight. The summer season is characteristic of August. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 15°C (59°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep. This is typically the warmest month of the year, so light summer clothing is a good idea.
Sunshine in Postojna in August
The city usually sees around 260 hours of sunlight, indicating many sunny days — a great month for sightseeing.If you're inclined towards comfortable temperatures and drier conditions, August is a good time to visit 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 August
Min Temperature
15°C (59°F)
Max Temperature
26°C (79°F)
Chance of Rain
47%
Precipitation
144 mm (5.7 in)
Rainy days
14 days
Humidity
63% *
Sunshine
260 hours *
Percentage Sunshine
62% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Postojna typically stay consistent throughout August, with daily highs averaging around 26°C (79°F). Nights are pleasant, with lows typically ranging from 14°C (57°F) to 17°C (63°F).
Average temperatures in August
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 August
Historical weather for Postojna in August
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 August
According to our 49 years of weather records for Postojna, the following extremes were recorded between 1976 and 2025.
- On August 7, 2013, temperatures climbed to 37°C (99°F), marking the warmest August day on record.
- Postojna experienced its chilliest August day on August 30, 2023, reaching only 14°C (57°F).
- The lowest overnight temperature recorded in August was 5°C (41°F) (August 30, 1998).
Best Places in Slovenia in August
Find out more about the weather in Slovenia and which places have the best travel conditions in this month. See all of Slovenia in August →
perfect weather
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unpleasant
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What to Wear in Postojna in August
Warm temperatures in August make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Postojna in August
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.
