Planning a trip to Trieste in September? You are in luck! The weather is generally good, with an average maximum temperature of +75°F and approximately 13 sunny days. Just be prepared for some rain, as there are usually around 8 rainy days and 153 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flightsin one click on Avionero.
Average weather
☀️
+75°F
Avg. max. temperature
+43°F
Min.
+90°F
Max.
153 mm
Total precipitation
66%
Avg. humidity
1 m/s
Avg. wind
13 ☀️
Sunny Days
9 ⛅️
Cloudy
8 🌦
Rainy
Our opinion: Trieste has good weather in September.
Average temperature in Trieste in September
Here are the expected maximum, average and minimum temperatures in Trieste for September based on the historical data.
Last Year
Historical Data
The expected average maximum temperature in September is +75°F with a maximum of +82°F and a minimum of +46°F.
The average maximum temperature goes down 20% by the end of the month, compared with the beginning of the month, from +77°F to +70°F.
Is Trieste warm or cold in September?
Trieste is typically warm in September.
Maximum temperatures go down compared to the previous month from +84°F to +75°F. The minimum temperature also goes down from +68°F to +61°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Trieste:
Climate in Trieste in September
Trieste weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+84°F
+75°F
+66°F
Min. temperature
+46°F
+43°F
+30°F
Max. temperature
+99°F
+90°F
+86°F
Rainfall
97 mm
153 mm
153 mm
Wind
1 m/s
1 m/s
1 m/s
Humidity
63%
66%
70%
Air pressure
1013 HPa
1015 HPa
1016 HPa
Sunny days
17
13
11
Cloudy days
8
9
11
Rainy days
6
8
9
Snowy days
0
0
0
September weather is still as good as in August.It’s getting colder in September. From +84°F in the day, the average maximum temperature lowers to +75°F.Prepare for more rain. Average rainfall goes from 97 mm to 153 mm.Humidity rises from 63% to 66%.The average wind speed doesn’t change much during September, staying around 1 m/s.The days becoming less sunny, going from 17 sunny days in August to 13 in September.
October brings much the same weather, it remains good.
Wind speed in Trieste in September based on historical data.
Last Year
Historical Data
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Trieste is gradually decreasing during September, going from 4 m/s to 1 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Trieste based on historical data.
Last Year
Historical Data
Typically, there is a 60% chance of rain on an average day in September, with total rainfall of approximately 343 mm. The maximum amount of rainfall per day is around 63 mm, which is considered heavy rain.September is a pretty wet month with over 18 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
September is one of the rainiest months in Trieste, here is a comparison with other months, total mm:
Trieste wettest month is November, where a typical day has a 33% chance of precipitation and 162 mm of rainfall per day. July, on the other hand, is the driest month with a mere 19% chance of precipitation and 71 mm of rainfall per day.
How was the weather last September in Trieste?
This is the weather in Trieste in September 2023:
1 September
☀️
+76°F
2 September
☀️
+80°F
3 September
☁️
+78°F
4 September
☁️
+81°F
5 September
☀️
+81°F
6 September
☀️
+81°F
7 September
☁️
+83°F
8 September
🌧️
+75°F
9 September
🌧️
+79°F
10 September
☀️
+81°F
11 September
☀️
+78°F
12 September
☀️
+78°F
13 September
☀️
+78°F
14 September
☁️
+80°F
15 September
🌧️
+81°F
16 September
🌧️
+78°F
17 September
🌧️
+64°F
18 September
☁️
+71°F
19 September
☀️
+75°F
20 September
☀️
+72°F
21 September
☀️
+70°F
22 September
☀️
+70°F
23 September
☀️
+69°F
24 September
☁️
+70°F
25 September
🌧️
+68°F
26 September
🌧️
+71°F
27 September
🌧️
+68°F
28 September
🌧️
+69°F
29 September
🌧️
+73°F
30 September
🌧️
+70°F
In September 2023 Trieste had 13 sunny days, 6 cloudy days, and 11 rainy days. The average maximum temperature was +75°F, with an absolute maximum of +82°F and a minimum of +64°F. The average humidity was 66%, with a maximum of 100% and a minimum of 22%. The average wind speed was 2 m/s, with a maximum of 9 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Trieste climate has changed over the last 43 years.
The climate in Trieste in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1996 (+71°F) and the highest in 2016 (+86°F). The driest year was 1985 with only 12 mm of rainfall, and the wettest year was 2013 with 478 mm.
FAQ
Frequently asked questions about the weather in Trieste in September:
Is September a good time to visit Trieste?
September is a really good time to go to Trieste. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Trieste.
Can you sunbathe in Trieste in September?
September is warm in Trieste. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Trieste rainy in September?
Trieste is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Trieste in September?
The amount of sunny days in Trieste during September varies; prepare for a mix of clouds and sun.
For this page, we’ve looked at the typical weather in Trieste, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.