Postojna weather in April
In April, Postojna sees average daytime highs of 14°C and overnight lows near 5°C, with 122 mm of precipitation across 13.7 wet days and about 13.3 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.
Highs climb over the month, from about 12°C in the first days to 16°C by the end. The sky is clear or mostly clear about 28% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 30 min at the start of April to 14 hours by month's end. Set against the rest of the year, April is Postojna's 7th-clearest and 6th-windiest month. For the whole year in context, see Postojna's year-round climate.
- Daytime high
- 14°
- 7th warmest
- Overnight low
- 5°
- 6th coldest
- Precipitation
- 122 mm
- 13.7 wet days
- Daylight
- 13 h 18 min
- 5:25 AM – 6:42 PM
- Cloud cover
- 62%
- 7th clearest
- Wind
- 9 km/h
- 6th windiest
- Solar energy
- 4.68 kWh/m²
- Travel score
- 3.7
- out of 10
Postojna is city in Slovenia.
- Density
- 288/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 12°C in the first days to 16°C by the end.
A typical April day in Postojna reaches about 14°C in the afternoon and slips back to 5°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 20°C. Set against its neighbours, April runs about 5°C warmer than March and about 4°C cooler than May.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 16 | 16 | 16 | 16 | 17 |
| Avg low (°C) | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 8 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 12 | 3 |
| 2 | 12 | 3 |
| 3 | 12 | 3 |
| 4 | 12 | 3 |
| 5 | 12 | 4 |
| 6 | 13 | 4 |
| 7 | 13 | 4 |
| 8 | 13 | 4 |
| 9 | 13 | 4 |
| 10 | 13 | 4 |
| 11 | 13 | 4 |
| 12 | 13 | 4 |
| 13 | 13 | 5 |
| 14 | 14 | 5 |
| 15 | 14 | 5 |
| 16 | 14 | 5 |
| 17 | 14 | 5 |
| 18 | 14 | 5 |
| 19 | 15 | 6 |
| 20 | 15 | 6 |
| 21 | 15 | 6 |
| 22 | 15 | 6 |
| 23 | 15 | 6 |
| 24 | 16 | 7 |
| 25 | 16 | 7 |
| 26 | 16 | 7 |
| 27 | 16 | 7 |
| 28 | 16 | 7 |
| 29 | 16 | 7 |
| 30 | 17 | 8 |
How April really feels in Postojna
Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Postojna weather by month
How April compares with the rest of the year at a glance. April is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 3° / -3° | 90 | 9.9 | 5.3 | 8.9 | 0.0 |
| Feb | 5° / -2° | 106 | 10 | 5.3 | 10.1 | 0.2 |
| Mar | 9° / 1° | 106 | 11.1 | 3.7 | 11.6 | 2.0 |
| Apr | 14° / 5° | 122 | 13.7 | 1.2 | 13.3 | 3.7 |
| May | 18° / 10° | 142 | 14.8 | 0 | 14.7 | 5.3 |
| Jun | 22° / 13° | 137 | 14.4 | 0 | 15.5 | 6.1 |
| Jul | 25° / 15° | 122 | 12.7 | 0 | 15.2 | 6.8 |
| Aug | 24° / 15° | 145 | 12.4 | 0 | 13.9 | 6.7 |
| Sep | 19° / 11° | 176 | 12.1 | 0 | 12.3 | 5.8 |
| Oct | 14° / 7° | 148 | 12.1 | 0.4 | 10.7 | 4.0 |
| Nov | 9° / 3° | 172 | 12.6 | 2.3 | 9.3 | 1.5 |
| Dec | 4° / -2° | 122 | 10.3 | 4.4 | 8.5 | 0.0 |
Cloud cover in April
The sky is clear or mostly clear about 28% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 17% of April, with mostly cloudy or overcast conditions the remaining 55%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 46 | 46 | 47 | 47 | 47 | 46 | 46 | 45 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 45 | 45 | 44 | 44 | 45 | 45 | 45 | 45 | 45 | 46 | 45 | 45 | 45 | 45 |
| Cloudier (%) | 54 | 54 | 53 | 53 | 53 | 54 | 54 | 55 | 56 | 56 | 56 | 56 | 56 | 56 | 56 | 56 | 55 | 55 | 56 | 56 | 55 | 55 | 55 | 55 | 55 | 54 | 55 | 55 | 55 | 55 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 46 | 54 |
| 2 | 46 | 54 |
| 3 | 47 | 53 |
| 4 | 47 | 53 |
| 5 | 47 | 53 |
| 6 | 46 | 54 |
| 7 | 46 | 54 |
| 8 | 45 | 55 |
| 9 | 44 | 56 |
| 10 | 44 | 56 |
| 11 | 44 | 56 |
| 12 | 44 | 56 |
| 13 | 44 | 56 |
| 14 | 44 | 56 |
| 15 | 44 | 56 |
| 16 | 44 | 56 |
| 17 | 45 | 55 |
| 18 | 45 | 55 |
| 19 | 44 | 56 |
| 20 | 44 | 56 |
| 21 | 45 | 55 |
| 22 | 45 | 55 |
| 23 | 45 | 55 |
| 24 | 45 | 55 |
| 25 | 45 | 55 |
| 26 | 46 | 54 |
| 27 | 45 | 55 |
| 28 | 45 | 55 |
| 29 | 45 | 55 |
| 30 | 45 | 55 |
Chance of precipitation in April
Postojna gets around 122 mm of rain and snow over 13.7 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 46% and peaks near 49% on the wettest days, and about 1 day brings snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 42 | 42 | 42 | 43 | 43 | 44 | 44 | 45 | 45 | 45 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 47 | 47 | 47 | 47 | 48 | 48 | 48 | 49 |
| Snow chance (%) | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 42 | 7 |
| 2 | 42 | 7 |
| 3 | 42 | 7 |
| 4 | 43 | 6 |
| 5 | 43 | 6 |
| 6 | 44 | 6 |
| 7 | 44 | 6 |
| 8 | 45 | 6 |
| 9 | 45 | 6 |
| 10 | 45 | 6 |
| 11 | 46 | 5 |
| 12 | 46 | 5 |
| 13 | 46 | 5 |
| 14 | 46 | 5 |
| 15 | 46 | 4 |
| 16 | 46 | 4 |
| 17 | 46 | 4 |
| 18 | 46 | 3 |
| 19 | 46 | 3 |
| 20 | 46 | 3 |
| 21 | 46 | 2 |
| 22 | 46 | 2 |
| 23 | 47 | 2 |
| 24 | 47 | 2 |
| 25 | 47 | 2 |
| 26 | 47 | 1 |
| 27 | 48 | 1 |
| 28 | 48 | 1 |
| 29 | 48 | 1 |
| 30 | 49 | 1 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 99 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| 1 | 100 | 0 |
| 2 | 100 | 0 |
| 3 | 100 | 0 |
| 4 | 100 | 0 |
| 5 | 100 | 0 |
| 6 | 100 | 0 |
| 7 | 100 | 0 |
| 8 | 100 | 0 |
| 9 | 100 | 0 |
| 10 | 100 | 0 |
| 11 | 100 | 0 |
| 12 | 100 | 0 |
| 13 | 100 | 0 |
| 14 | 100 | 0 |
| 15 | 100 | 0 |
| 16 | 100 | 0 |
| 17 | 100 | 0 |
| 18 | 100 | 0 |
| 19 | 100 | 0 |
| 20 | 100 | 0 |
| 21 | 100 | 0 |
| 22 | 100 | 0 |
| 23 | 100 | 0 |
| 24 | 100 | 0 |
| 25 | 100 | 0 |
| 26 | 100 | 0 |
| 27 | 100 | 0 |
| 28 | 100 | 0 |
| 29 | 100 | 0 |
| 30 | 99 | 1 |
Wind in April
Winds average 9 km/h in April.
Across April, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 8 | calm |
| 25 | 8 | calm |
| 26 | 8 | calm |
| 27 | 8 | calm |
| 28 | 8 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
Sunrise & sunset in April
Daylight runs from about 12 h 30 min at the start of April to 14 hours by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 90 minutes over April. Sunrise moves from 5:53 AM to 5:00 AM, and sunset from 6:22 PM to 7:01 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.5 | 12.5 | 12.6 | 12.6 | 12.7 | 12.8 | 12.8 | 12.9 | 12.9 | 13.0 | 13.0 | 13.1 | 13.1 | 13.2 | 13.2 | 13.3 | 13.3 | 13.4 | 13.5 | 13.5 | 13.6 | 13.6 | 13.7 | 13.7 | 13.8 | 13.8 | 13.9 | 13.9 | 14.0 | 14.0 |
| Sunrise (AM) | 5:53 | 5:51 | 5:49 | 5:47 | 5:45 | 5:44 | 5:42 | 5:40 | 5:38 | 5:36 | 5:34 | 5:32 | 5:30 | 5:28 | 5:26 | 5:25 | 5:23 | 5:21 | 5:19 | 5:17 | 5:15 | 5:14 | 5:12 | 5:10 | 5:09 | 5:07 | 5:05 | 5:04 | 5:02 | 5:00 |
| Sunset (PM) | 6:22 | 6:24 | 6:25 | 6:26 | 6:28 | 6:29 | 6:30 | 6:32 | 6:33 | 6:34 | 6:36 | 6:37 | 6:38 | 6:40 | 6:41 | 6:42 | 6:44 | 6:45 | 6:46 | 6:47 | 6:49 | 6:50 | 6:51 | 6:53 | 6:54 | 6:55 | 6:57 | 6:58 | 6:59 | 7:01 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.5 | 5:53 | 6:22 |
| 2 | 12.5 | 5:51 | 6:24 |
| 3 | 12.6 | 5:49 | 6:25 |
| 4 | 12.6 | 5:47 | 6:26 |
| 5 | 12.7 | 5:45 | 6:28 |
| 6 | 12.8 | 5:44 | 6:29 |
| 7 | 12.8 | 5:42 | 6:30 |
| 8 | 12.9 | 5:40 | 6:32 |
| 9 | 12.9 | 5:38 | 6:33 |
| 10 | 13.0 | 5:36 | 6:34 |
| 11 | 13.0 | 5:34 | 6:36 |
| 12 | 13.1 | 5:32 | 6:37 |
| 13 | 13.1 | 5:30 | 6:38 |
| 14 | 13.2 | 5:28 | 6:40 |
| 15 | 13.2 | 5:26 | 6:41 |
| 16 | 13.3 | 5:25 | 6:42 |
| 17 | 13.3 | 5:23 | 6:44 |
| 18 | 13.4 | 5:21 | 6:45 |
| 19 | 13.5 | 5:19 | 6:46 |
| 20 | 13.5 | 5:17 | 6:47 |
| 21 | 13.6 | 5:15 | 6:49 |
| 22 | 13.6 | 5:14 | 6:50 |
| 23 | 13.7 | 5:12 | 6:51 |
| 24 | 13.7 | 5:10 | 6:53 |
| 25 | 13.8 | 5:09 | 6:54 |
| 26 | 13.8 | 5:07 | 6:55 |
| 27 | 13.9 | 5:05 | 6:57 |
| 28 | 13.9 | 5:04 | 6:58 |
| 29 | 14.0 | 5:02 | 6:59 |
| 30 | 14.0 | 5:00 | 7:01 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 4.68 kWh/m².
For context, solar energy here swings from a low near 1.07 kWh/m² to a high of 6.11 kWh/m² in July across the year — April's 4.68 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.2 | 4.2 | 4.2 | 4.3 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 | 4.5 | 4.5 | 4.5 | 4.6 | 4.6 | 4.7 | 4.7 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.2 | Bright |
| 2 | 4.2 | Bright |
| 3 | 4.2 | Bright |
| 4 | 4.3 | Bright |
| 5 | 4.3 | Bright |
| 6 | 4.3 | Bright |
| 7 | 4.4 | Bright |
| 8 | 4.4 | Bright |
| 9 | 4.4 | Bright |
| 10 | 4.5 | Bright |
| 11 | 4.5 | Bright |
| 12 | 4.5 | Bright |
| 13 | 4.6 | Bright |
| 14 | 4.6 | Bright |
| 15 | 4.7 | Bright |
| 16 | 4.7 | Bright |
| 17 | 4.8 | Bright |
| 18 | 4.8 | Bright |
| 19 | 4.8 | Bright |
| 20 | 4.9 | Bright |
| 21 | 4.9 | Bright |
| 22 | 4.9 | Bright |
| 23 | 5.0 | Bright |
| 24 | 5.0 | Bright |
| 25 | 5.0 | Bright |
| 26 | 5.0 | Bright |
| 27 | 5.0 | Bright |
| 28 | 5.1 | Bright |
| 29 | 5.1 | Bright |
| 30 | 5.1 | Bright |
Is April a good time to visit Postojna?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a weaker month for outdoor sightseeing in Postojna.
What to pack for Postojna in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Postojna sees daytime highs around 14°C and nights near 5°C. Pack rain gear. Worth having: a warm layer and sun protection. About 14 days see rain.
Sea temperature near Postojna in April
The nearest coast averages about 12°C in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 46 km away) is warmest in August at about 23°C and coldest in February near 10°C.
It's comfortable for a long swim from Jun 10 to Sep 22 — about 3.5 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 10 | 10 | 10 | 12 | 17 | 21 | 23 | 23 | 21 | 18 | 15 | 12 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 10 | Bracing |
| Feb | 10 | Bracing |
| Mar | 10 | Bracing |
| Apr | 12 | Bracing |
| May | 17 | Cool |
| Jun | 21 | Refreshing |
| Jul | 23 | Refreshing |
| Aug | 23 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 18 | Cool |
| Nov | 15 | Cool |
| Dec | 12 | Bracing |
UV index in Postojna in April
Clear-sky midday UV in April peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Postojna peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 5 | 7 | 7 | 8 | 9 | 8 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | Very high | High | Very high | Very high | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | Very high |
| May | 7 | High |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 5 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Postojna in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Postojna is worst in January — around 19 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 19 | 17 | 18 | 18 | 15 | 16 | 14 | 13 | 12 | 13 | 13 | 15 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 19 | Moderate |
| Feb | 17 | Moderate |
| Mar | 18 | Moderate |
| Apr | 18 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 14 | Moderate |
| Aug | 13 | Moderate |
| Sep | 12 | Good |
| Oct | 13 | Moderate |
| Nov | 13 | Moderate |
| Dec | 15 | Moderate |
Where is Postojna?
Postojna sits at 45.8°N, 14.2°E, 0 m above sea level, in Slovenia. The nearest listed city is Divača, 21 km away.
Topography around Postojna
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Postojna.
Within 3 km, the terrain around Postojna has significant variations in elevation — a maximum elevation change of 409 m around an average of 606 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,054 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,695 m.
The land around Postojna is covered by trees (69%) and grassland (20%) within 3 km, trees (77%) within 16 km, and trees (70%) within 80 km.
Slovenia travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 63% of US
- price level, 2025
- GDP per capita
- $37,376
- 2025
- Happiness
- 6.9 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 0.6
- per 100k, 2023
- Road deaths
- 5.1
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Postojna (45.7743°, 14.2153°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).