Weather in Cagliari in September 2025
Average weather
Average temperature in Cagliari in September
The temperature in September is +29°C on average, with a range between a maximum of +33°C during the day and a minimum of +15°C at night.
The average maximum temperature goes down 11% by the end of the month, compared with the beginning of the month, from +30°C to +28°C.
Is Cagliari warm or cold in September?
Cagliari 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 Cagliari, here is the comparison with other months:
Water temperature in Cagliari in September
Water in Cagliari in September is Comfortable. It varies from +21°C to +27°C, with an average of +24°C. This is almost similar to the air temperature, which averages +27°C.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Cagliari in September?
Climate in Cagliari in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +30°C | +27°C | +23°C | ||||
| Min. temperature | ||||||
| +13°C | +11°C | +5°C | ||||
| Max. temperature | ||||||
| +40°C | +36°C | +31°C | ||||
| Rainfall | ||||||
| 6 mm | 25 mm | 35 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +25°C | +24°C | +22°C | ||||
| Humidity | ||||||
| 66% | 72% | 77% | ||||
| Air pressure | ||||||
| 1013 HPa | 1014 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 25 | 16 | 12 | ||||
| Cloudy days | ||||||
| 3 | 4 | 8 | ||||
| Rainy days | ||||||
| 1 | 4 | 6 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as great as in 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 6 mm to 25 mm. Humidity rises from 66% to 72%. The average wind speed doesn’t change much during September, staying around 3 m/s. The days becoming less sunny, going from 25 sunny days in August to 16 in September.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Cagliari is gradually increasing during September, going from 3 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Cagliari?
Climate Change over Years
The climate in Cagliari in September has not changed much over the last 43 years.
The average temperature was the lowest in 1984 (+19°C) and the highest in 2022 (+24°C). The driest year was 1989 with only 134 mm of rainfall, and the wettest year was 2020 with 1145 mm.
FAQ
Is September a good time to visit Cagliari?
Can you sunbathe in Cagliari in September?
Can you swim in Cagliari in September?
Is Cagliari rainy in September?
Is it sunny in Cagliari in September?
Other cities in Italy
Monthly weather in Cagliari
Source of the data
For this page, we’ve looked at the typical weather in Cagliari, 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.