The best times to visit Postojna for ideal weather are
June 4th to September 23rd
Postojna Travel Guide
Other Postojna Travel Info
Weather in Postojna
Average temperatures in Postojna vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 26th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Postojna, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally early to mid August where highs are regularly around 86.5°F (30.3°C) with temperatures rarely dropping below 58.5°F (14.7°C) at night.
Postojna Temperatures (Fahrenheit)
Postojna Temperatures (Celsius)
Postojna Perceived Temperature (F)
Postojna Perceived Temperature (C)
Average Postojna Temperatures by Month
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Postojna are December, July, and then April. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early to mid August. For example, on the week of August 6th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late January and early February with an average of 4 days of significant precipitation the week of January 29th.
When can you find snow in Postojna? Weather stations report large amounts of snow likely to be deepest around February, especially close to mid February. The best time to ski (if at all) in Postojna is often around around February 12th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Postojna.
Snow on the Ground
The graph below shows the average snow on the ground in Postojna (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Postojna has some very humid months, with other comfortably humid months. The least humid month is June (58.1% relative humidity), and the most humid month is January (80%).
Wind in Postojna is usually extremely calm. The windiest month is February, followed by November and March. February’s average wind speed of around 4.4 knots (5 MPH or 8.1 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early February where average top sustained speeds reach 8.1 knots, which is considered a gentle breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Postojna.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||3.8||Barely noticeable||6.3||Light breeze|
|Feb||4.4||Light breeze||7.1||Gentle breeze|
|Mar||4.2||Light breeze||7||Light breeze|
|Apr||3.8||Barely noticeable||6.6||Light breeze|
|May||3.9||Barely noticeable||6.5||Light breeze|
|Jun||3.5||Barely noticeable||6||Light breeze|
|Jul||3.5||Barely noticeable||6.3||Light breeze|
|Aug||3.5||Barely noticeable||6||Light breeze|
|Sep||3.5||Barely noticeable||5.5||Light breeze|
|Oct||3.8||Barely noticeable||6.3||Light breeze|
|Nov||4.3||Light breeze||6.8||Light breeze|
|Dec||3.7||Barely noticeable||6||Light breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Postojna?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for Slovenia; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Aug 22, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Postojna, Slovenia is October, followed by January and February. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Postojna in April. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Postojna Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 69°F (20.6°C) and 46.3°F (7.9°C) with warmer temperatures in the later months. Rain is somewhat common with 7 to 11 days of significant precipitation per month. Spring is the slowest for tourism, which makes it a good time for those looking for deals.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see the least precipitation with 6 to 7 days of precipitation per month. June – August is the second busiest season for tourism in Postojna, so lodging and other accommodations may cost slightly more.
Fall (September through November)
Fall daily highs range from 73.8°F (23.2°C) and 43.4°F (6.3°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 7 to 9 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.
Winter (December through February)
Weather is too cold this time of year in Postojna to be enjoyable for warm weather travelers. The average high during this season is between 47.3°F (8.5°C) and 36.9°F (2.7°C). On average, it rains or snows a fair amount: 5 to 10 times per month. These times of year are the busiest with tourists.