Trieste weather in October
In October, Trieste sees average daytime highs of 16°C and overnight lows near 11°C, with 184 mm of precipitation across 13 wet days and about 10.7 hours of daylight. It is the 6th-warmest and 2nd-wettest month of the year here.
Highs ease over the month, from about 18°C in the first days to 14°C by the end. The sky is clear or mostly clear about 35% of the time in October, and the air most often feels dry.
Daylight stretches from about 11 h 30 min at the start of October to 9 h 54 min by month's end. Set against the rest of the year, October is Trieste's 7th-clearest and 3rd-windiest month. For the whole year in context, see Trieste's year-round climate.
- Daytime high
- 16°
- 6th warmest
- Overnight low
- 11°
- 7th coldest
- Precipitation
- 184 mm
- 13 wet days
- Daylight
- 10 h 42 min
- 6:29 AM – 5:10 PM
- Cloud cover
- 57%
- 7th clearest
- Wind
- 11 km/h
- 3rd windiest
- Solar energy
- 2.45 kWh/m²
- Travel score
- 4.8
- out of 10
- Air quality
- Moderate
- PM2.5 12 µg/m³ · 2019
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in October
Highs ease over the month, from about 18°C in the first days to 14°C by the end.
A typical October day in Trieste reaches about 16°C in the afternoon and slips back to 11°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 20°C. Set against its neighbours, October runs about 5°C cooler than September and about 5°C warmer than November.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 |
| Avg low (°C) | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 19 | 13 |
| 2 | 19 | 13 |
| 3 | 18 | 13 |
| 4 | 18 | 13 |
| 5 | 18 | 13 |
| 6 | 18 | 13 |
| 7 | 18 | 12 |
| 8 | 18 | 12 |
| 9 | 17 | 12 |
| 10 | 17 | 12 |
| 11 | 17 | 12 |
| 12 | 17 | 12 |
| 13 | 17 | 11 |
| 14 | 17 | 11 |
| 15 | 16 | 11 |
| 16 | 16 | 11 |
| 17 | 16 | 11 |
| 18 | 16 | 11 |
| 19 | 16 | 10 |
| 20 | 16 | 10 |
| 21 | 15 | 10 |
| 22 | 15 | 10 |
| 23 | 15 | 10 |
| 24 | 15 | 10 |
| 25 | 15 | 10 |
| 26 | 15 | 10 |
| 27 | 15 | 10 |
| 28 | 14 | 9 |
| 29 | 14 | 9 |
| 30 | 14 | 9 |
| 31 | 14 | 9 |
How October really feels in Trieste
Once humidity and wind are folded in, October 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.
October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Trieste weather by month
How October compares with the rest of the year at a glance. October is the 6th-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 6° / 2° | 90 | 9.5 | 2.7 | 8.9 | 0.5 |
| Feb | 7° / 2° | 97 | 8.6 | 2.9 | 10.1 | 1.1 |
| Mar | 11° / 5° | 101 | 9.7 | 1.6 | 11.6 | 2.7 |
| Apr | 15° / 8° | 110 | 12.1 | 0.5 | 13.3 | 4.2 |
| May | 19° / 13° | 122 | 13 | 0 | 14.7 | 5.8 |
| Jun | 23° / 17° | 111 | 12.2 | 0 | 15.4 | 6.7 |
| Jul | 26° / 19° | 87 | 10.7 | 0 | 15.1 | 7.0 |
| Aug | 26° / 19° | 111 | 10.3 | 0 | 13.9 | 7.0 |
| Sep | 21° / 15° | 170 | 11.4 | 0 | 12.3 | 6.4 |
| Oct | 16° / 11° | 184 | 13 | 0.1 | 10.7 | 4.8 |
| Nov | 11° / 7° | 195 | 13.2 | 1.1 | 9.3 | 2.5 |
| Dec | 7° / 3° | 129 | 10.1 | 2.1 | 8.6 | 0.9 |
Cloud cover in October
The sky is clear or mostly clear about 35% of the time in October.
Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 51%.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 50 | 50 | 50 | 50 | 49 | 49 | 50 | 50 | 50 | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 52 | 52 | 51 | 51 | 50 | 49 | 48 | 48 | 48 | 46 | 46 | 45 | 44 | 43 | 42 |
| Cloudier (%) | 50 | 50 | 50 | 50 | 51 | 51 | 50 | 50 | 50 | 49 | 49 | 49 | 48 | 48 | 48 | 48 | 48 | 48 | 49 | 49 | 50 | 51 | 52 | 52 | 52 | 54 | 54 | 55 | 56 | 57 | 58 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 50 | 50 |
| 2 | 50 | 50 |
| 3 | 50 | 50 |
| 4 | 50 | 50 |
| 5 | 49 | 51 |
| 6 | 49 | 51 |
| 7 | 50 | 50 |
| 8 | 50 | 50 |
| 9 | 50 | 50 |
| 10 | 51 | 49 |
| 11 | 51 | 49 |
| 12 | 51 | 49 |
| 13 | 52 | 48 |
| 14 | 52 | 48 |
| 15 | 52 | 48 |
| 16 | 52 | 48 |
| 17 | 52 | 48 |
| 18 | 52 | 48 |
| 19 | 51 | 49 |
| 20 | 51 | 49 |
| 21 | 50 | 50 |
| 22 | 49 | 51 |
| 23 | 48 | 52 |
| 24 | 48 | 52 |
| 25 | 48 | 52 |
| 26 | 46 | 54 |
| 27 | 46 | 54 |
| 28 | 45 | 55 |
| 29 | 44 | 56 |
| 30 | 43 | 57 |
| 31 | 42 | 58 |
Chance of precipitation in October
Trieste gets around 184 mm of rain and snow over 13 wet days in October. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 41% and peaks near 45% on the wettest days, and about 0 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 44 | 45 | 45 | 45 | 45 | 45 | 44 | 44 | 43 | 42 | 41 | 41 | 40 | 39 | 39 | 38 | 38 | 38 | 38 | 39 | 39 | 39 | 39 | 40 | 40 | 40 | 41 | 41 | 42 | 42 | 43 |
| Rain chance (%) | |
|---|---|
| 1 | 44 |
| 2 | 45 |
| 3 | 45 |
| 4 | 45 |
| 5 | 45 |
| 6 | 45 |
| 7 | 44 |
| 8 | 44 |
| 9 | 43 |
| 10 | 42 |
| 11 | 41 |
| 12 | 41 |
| 13 | 40 |
| 14 | 39 |
| 15 | 39 |
| 16 | 38 |
| 17 | 38 |
| 18 | 38 |
| 19 | 38 |
| 20 | 39 |
| 21 | 39 |
| 22 | 39 |
| 23 | 39 |
| 24 | 40 |
| 25 | 40 |
| 26 | 40 |
| 27 | 41 |
| 28 | 41 |
| 29 | 42 |
| 30 | 42 |
| 31 | 43 |
Humidity in October
Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, October lands in the dry band about 76% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 59 | 59 | 60 | 61 | 63 | 64 | 65 | 67 | 69 | 70 | 73 | 75 | 76 | 77 | 78 | 80 | 80 | 81 | 82 | 82 | 83 | 83 | 84 | 84 | 85 | 85 | 86 | 87 | 88 | 89 | 90 |
| Comfortable (%) | 29 | 29 | 29 | 28 | 27 | 27 | 26 | 25 | 24 | 23 | 21 | 20 | 19 | 19 | 18 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 15 | 15 | 14 | 14 | 13 | 13 | 12 | 11 | 10 |
| Humid (%) | 12 | 12 | 11 | 11 | 10 | 9 | 9 | 8 | 7 | 7 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 59 | 29 | 12 |
| 2 | 59 | 29 | 12 |
| 3 | 60 | 29 | 11 |
| 4 | 61 | 28 | 11 |
| 5 | 63 | 27 | 10 |
| 6 | 64 | 27 | 9 |
| 7 | 65 | 26 | 9 |
| 8 | 67 | 25 | 8 |
| 9 | 69 | 24 | 7 |
| 10 | 70 | 23 | 7 |
| 11 | 73 | 21 | 6 |
| 12 | 75 | 20 | 5 |
| 13 | 76 | 19 | 5 |
| 14 | 77 | 19 | 4 |
| 15 | 78 | 18 | 4 |
| 16 | 80 | 17 | 3 |
| 17 | 80 | 17 | 3 |
| 18 | 81 | 17 | 2 |
| 19 | 82 | 16 | 2 |
| 20 | 82 | 16 | 2 |
| 21 | 83 | 16 | 1 |
| 22 | 83 | 16 | 1 |
| 23 | 84 | 15 | 1 |
| 24 | 84 | 15 | 1 |
| 25 | 85 | 14 | 1 |
| 26 | 85 | 14 | 1 |
| 27 | 86 | 13 | 1 |
| 28 | 87 | 13 | 0 |
| 29 | 88 | 12 | 0 |
| 30 | 89 | 11 | 0 |
| 31 | 90 | 10 | 0 |
Wind in October
Winds average 11 km/h in October.
Across October, daily wind ranges from about 10 km/h on the calmest days to 11 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| 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 | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 10 | calm |
| 2 | 10 | calm |
| 3 | 10 | calm |
| 4 | 10 | calm |
| 5 | 10 | calm |
| 6 | 10 | calm |
| 7 | 10 | calm |
| 8 | 10 | calm |
| 9 | 11 | calm |
| 10 | 11 | calm |
| 11 | 11 | calm |
| 12 | 11 | calm |
| 13 | 11 | calm |
| 14 | 11 | calm |
| 15 | 11 | calm |
| 16 | 11 | calm |
| 17 | 11 | calm |
| 18 | 11 | calm |
| 19 | 11 | calm |
| 20 | 11 | calm |
| 21 | 11 | calm |
| 22 | 11 | calm |
| 23 | 11 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 11 | calm |
| 30 | 11 | calm |
| 31 | 11 | calm |
Sunrise & sunset in October
Daylight runs from about 11 h 30 min at the start of October to 9 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 96 minutes over October. Sunrise moves from 6:09 AM to 6:51 AM, and sunset from 5:39 PM to 4:46 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.5 | 11.4 | 11.4 | 11.3 | 11.3 | 11.2 | 11.2 | 11.1 | 11.1 | 11.0 | 11.0 | 10.9 | 10.8 | 10.8 | 10.7 | 10.7 | 10.6 | 10.6 | 10.5 | 10.5 | 10.4 | 10.4 | 10.3 | 10.3 | 10.2 | 10.2 | 10.1 | 10.1 | 10.0 | 10.0 | 9.9 |
| Sunrise (AM) | 6:09 | 6:10 | 6:12 | 6:13 | 6:14 | 6:16 | 6:17 | 6:18 | 6:20 | 6:21 | 6:23 | 6:24 | 6:25 | 6:27 | 6:28 | 6:29 | 6:31 | 6:32 | 6:34 | 6:35 | 6:36 | 6:38 | 6:39 | 6:41 | 6:42 | 6:43 | 6:45 | 6:46 | 6:48 | 6:49 | 6:51 |
| Sunset (PM) | 5:39 | 5:37 | 5:35 | 5:33 | 5:31 | 5:29 | 5:27 | 5:25 | 5:23 | 5:21 | 5:20 | 5:18 | 5:16 | 5:14 | 5:12 | 5:10 | 5:09 | 5:07 | 5:05 | 5:04 | 5:02 | 5:00 | 4:59 | 4:57 | 4:55 | 4:54 | 4:52 | 4:51 | 4:49 | 4:48 | 4:46 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.5 | 6:09 | 5:39 |
| 2 | 11.4 | 6:10 | 5:37 |
| 3 | 11.4 | 6:12 | 5:35 |
| 4 | 11.3 | 6:13 | 5:33 |
| 5 | 11.3 | 6:14 | 5:31 |
| 6 | 11.2 | 6:16 | 5:29 |
| 7 | 11.2 | 6:17 | 5:27 |
| 8 | 11.1 | 6:18 | 5:25 |
| 9 | 11.1 | 6:20 | 5:23 |
| 10 | 11.0 | 6:21 | 5:21 |
| 11 | 11.0 | 6:23 | 5:20 |
| 12 | 10.9 | 6:24 | 5:18 |
| 13 | 10.8 | 6:25 | 5:16 |
| 14 | 10.8 | 6:27 | 5:14 |
| 15 | 10.7 | 6:28 | 5:12 |
| 16 | 10.7 | 6:29 | 5:10 |
| 17 | 10.6 | 6:31 | 5:09 |
| 18 | 10.6 | 6:32 | 5:07 |
| 19 | 10.5 | 6:34 | 5:05 |
| 20 | 10.5 | 6:35 | 5:04 |
| 21 | 10.4 | 6:36 | 5:02 |
| 22 | 10.4 | 6:38 | 5:00 |
| 23 | 10.3 | 6:39 | 4:59 |
| 24 | 10.3 | 6:41 | 4:57 |
| 25 | 10.2 | 6:42 | 4:55 |
| 26 | 10.2 | 6:43 | 4:54 |
| 27 | 10.1 | 6:45 | 4:52 |
| 28 | 10.1 | 6:46 | 4:51 |
| 29 | 10.0 | 6:48 | 4:49 |
| 30 | 10.0 | 6:49 | 4:48 |
| 31 | 9.9 | 6:51 | 4:46 |
Solar energy in October
Average shortwave solar energy reaching the ground each day in October, about 2.45 kWh/m².
For context, solar energy here swings from a low near 1.14 kWh/m² to a high of 6.28 kWh/m² in July across the year — October's 2.45 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.0 | 3.0 | 3.0 | 2.9 | 2.9 | 2.8 | 2.8 | 2.8 | 2.7 | 2.7 | 2.6 | 2.6 | 2.6 | 2.5 | 2.5 | 2.5 | 2.5 | 2.4 | 2.4 | 2.3 | 2.3 | 2.3 | 2.2 | 2.2 | 2.1 | 2.1 | 2.0 | 2.0 | 2.0 | 1.9 | 1.9 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Dim | Dim | Dim |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 3.0 | Moderate |
| 2 | 3.0 | Moderate |
| 3 | 3.0 | Moderate |
| 4 | 2.9 | Moderate |
| 5 | 2.9 | Moderate |
| 6 | 2.8 | Moderate |
| 7 | 2.8 | Moderate |
| 8 | 2.8 | Moderate |
| 9 | 2.7 | Moderate |
| 10 | 2.7 | Moderate |
| 11 | 2.6 | Moderate |
| 12 | 2.6 | Moderate |
| 13 | 2.6 | Moderate |
| 14 | 2.5 | Moderate |
| 15 | 2.5 | Moderate |
| 16 | 2.5 | Moderate |
| 17 | 2.5 | Moderate |
| 18 | 2.4 | Moderate |
| 19 | 2.4 | Moderate |
| 20 | 2.3 | Moderate |
| 21 | 2.3 | Moderate |
| 22 | 2.3 | Moderate |
| 23 | 2.2 | Moderate |
| 24 | 2.2 | Moderate |
| 25 | 2.1 | Moderate |
| 26 | 2.1 | Moderate |
| 27 | 2.0 | Moderate |
| 28 | 2.0 | Moderate |
| 29 | 2.0 | Dim |
| 30 | 1.9 | Dim |
| 31 | 1.9 | Dim |
Is October a good time to visit Trieste?
Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
October is a reasonable time to visit Trieste for sightseeing.
What to pack for Trieste in October
From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In October, Trieste sees daytime highs around 16°C and nights near 11°C. Worth packing: a warm layer and rain gear. About 13 days see rain.
Sea temperature near Trieste in October
The nearest coast averages about 19°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 25°C and coldest in February near 10°C.
It's comfortable for a long swim from May 31 to Oct 9 — about 4.3 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 11 | 10 | 10 | 13 | 18 | 23 | 25 | 25 | 23 | 19 | 16 | 13 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 11 | Bracing |
| Feb | 10 | Bracing |
| Mar | 10 | Bracing |
| Apr | 13 | Bracing |
| May | 18 | Cool |
| Jun | 23 | Refreshing |
| Jul | 25 | Warm |
| Aug | 25 | Warm |
| Sep | 23 | Refreshing |
| Oct | 19 | Cool |
| Nov | 16 | Cool |
| Dec | 13 | Bracing |
UV index in Trieste in October
Clear-sky midday UV in October peaks around 3. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Trieste peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 7 | 7 | 8 | 8 | 7 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 7 | High |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 7 | Very high |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Trieste in October
Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.
Air quality in Trieste is worst in January — around 16 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (September, 9 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Trieste's WHO annual average of 12 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 16 | 14 | 14 | 13 | 11 | 12 | 12 | 10 | 9 | 10 | 10 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Good | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 16 | Moderate |
| Feb | 14 | Moderate |
| Mar | 14 | Moderate |
| Apr | 13 | Moderate |
| May | 11 | Good |
| Jun | 12 | Good |
| Jul | 12 | Good |
| Aug | 10 | Good |
| Sep | 9 | Good |
| Oct | 10 | Good |
| Nov | 10 | Good |
| Dec | 13 | Moderate |
Where is Trieste?
Trieste sits at 45.6°N, 13.8°E, 2 m above sea level, in Italy. The nearest listed city is Koper, 12 km away.
Topography around Trieste
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Trieste.
Within 3 km, the terrain around Trieste has significant variations in elevation — a maximum elevation change of 451 m around an average of 72 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 779 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,524 m.
The land around Trieste is covered by artificial surfaces (41%), trees (31%) and water (27%) within 3 km, trees (50%) and water (32%) within 16 km, and trees (52%) and water (23%) within 80 km.
Italy travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F / L
- 230 V · 50 Hz
- Prices
- ≈ 69% of US
- price level, 2025
- GDP per capita
- $43,309
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 0.6
- per 100k, 2023
- Road deaths
- 5.3
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 513
- 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 Trieste (45.6495°, 13.7768°, elevation 2 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).