Weather in Olbia in September 2025
Average weather
Average temperature in Olbia in September
Going from a maximum of +32°C during the day to a minimum of +17°C during the night, the temperature in September averages around +29°C.
The average maximum temperature goes up 7% by the end of the month, compared with the beginning of the month, from +28°C to +29°C.
Is Olbia warm or cold in September?
Olbia is typically warm in September.
Maximum temperatures go down compared to the previous month from +30°C to +27°C. The minimum temperature also goes down from +21°C to +18°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Olbia, here is the comparison with other months:
Climate in Olbia in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +30°C | +27°C | +23°C | ||||
| Min. temperature | ||||||
| +14°C | +11°C | +6°C | ||||
| Max. temperature | ||||||
| +38°C | +35°C | +31°C | ||||
| Rainfall | ||||||
| 17 mm | 38 mm | 54 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 63% | 70% | 76% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 21 | 14 | 10 | ||||
| Cloudy days | ||||||
| 2 | 4 | 8 | ||||
| Rainy days | ||||||
| 6 | 10 | 11 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting colder in September. From +30°C in the day, the average maximum temperature lowers to +27°C. Prepare for more rain. Average rainfall goes from 17 mm to 38 mm. Humidity rises from 63% to 70%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 21 sunny days in August to 14 in September.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Olbia is gradually decreasing during September, going from 3 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Olbia?
Climate Change over Years
The climate in Olbia in September has not changed much over the last 43 years.
The average temperature was the lowest in 1980 (+19°C) and the highest in 2022 (+23°C). The driest year was 1987 with only 324 mm of rainfall, and the wettest year was 2018 with 1032 mm.
FAQ
Is September a good time to visit Olbia?
Can you sunbathe in Olbia in September?
Is Olbia rainy in September?
Is it sunny in Olbia in September?
Other cities in Italy
Monthly weather in Olbia
Source of the data
For this page, we’ve looked at the typical weather in Olbia, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
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.