Postojna Weather in January
January in Postojna sees daytime temperatures around 5°C (41°F) and lows of -2°C (28°F) at night. As the driest month of the year.
Rainfall in Postojna in January
Expect the least amount of rain this month, making it a good opportunity for outdoor activities, even though days are on the cooler side. You can expect snow/rain on around 14 days based on historical patterns, with 89 mm (3.5 in) average for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Postojna in January
Expect highs of 5°C (41°F) in Postojna in January, with nights dropping to around -2°C (28°F). This month falls in the winter season. Cold conditions tend to persist from morning through evening, so be prepared for winter weather. Nights are well below freezing at -2°C (28°F). An extra blanket is a good idea if you feel the cold, especially in older or less well-heated accommodation. This month is known for being the coldest, so make sure you pack appropriately with plenty of warm clothing.
Sunshine in Postojna in January
The month has fewer sunny days, with around 98 hours of sunshine.January in Postojna has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
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 January
Min Temperature
-2°C (28°F)
Max Temperature
5°C (41°F)
Chance of Rain
46%
Precipitation
89 mm (3.5 in)
Rainy days
14 days
Humidity
67% *
Sunshine
98 hours *
Percentage Sunshine
38% *
Daily Historical Temperatures
51-year average (1976-2026)
Based on our historical records, temperatures in Postojna typically stay consistent throughout January, with daily highs averaging around 5°C (41°F). Nights are very cold, with lows around -1°C (30°F).
Average temperatures in January
Daily Historical Precipitation
51-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for Postojna in January
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 January
Based on weather observations in Postojna between 2000 and 2025, these are the recorded extremes during January.
- The hottest January day on record in Postojna reached 14°C (57°F) (January 7, 2001).
- On January 10, 2017, Postojna saw its coldest January day with temperatures maxing out at -5°C (23°F).
- The lowest overnight temperature recorded in January was -18°C (0°F) (January 26, 2000).
Best Places in Slovenia in January
Find out more about the weather in Slovenia and which places have the best travel conditions in this month. See all of Slovenia in January →
perfect weather
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tolerable
unpleasant
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What to Wear in Postojna in January
We recommend to layer up for chilly conditions in Postojna in January. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With limited sunshine expected, sunglasses aren't a priority for packing.What To Do in Postojna in January
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.
