Weather in Iasi in September 2025
Average weather
Average temperature in Iasi in September
The temperature in September is +27°C on average, with a range between a maximum of +32°C during the day and a minimum of +10°C at night.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +28°C to +28°C.
Is Iasi warm or cold in September?
Iasi is typically warm in September.
Maximum temperatures go down compared to the previous month from +28°C to +23°C. The minimum temperature also goes down from +16°C to +12°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Iasi:
Climate in Iasi in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +28°C | +23°C | +16°C | ||||
| Min. temperature | ||||||
| +8°C | +2°C | -7°C | ||||
| Max. temperature | ||||||
| +42°C | +37°C | +33°C | ||||
| Rainfall | ||||||
| 50 mm | 46 mm | 89 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 67% | 71% | 76% | ||||
| Air pressure | ||||||
| 1014 HPa | 1016 HPa | 1019 HPa | ||||
| Sunny days | ||||||
| 13 | 11 | 9 | ||||
| Cloudy days | ||||||
| 5 | 8 | 11 | ||||
| Rainy days | ||||||
| 11 | 10 | 10 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +28°C in the day, the average maximum temperature lowers to +23°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 50 mm to 46 mm. Humidity rises from 67% to 71%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 13 sunny days in August to 11 in September.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 3 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Iasi is gradually decreasing during September, going from 3 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Iasi?
Climate Change over Years
The climate in Iasi in September has not changed much over the last 43 years.
The average temperature was the lowest in 1980 (+13°C) and the highest in 2023 (+18°C). The driest year was 2018 with only 259 mm of rainfall, and the wettest year was 2023 with 10911 mm.
FAQ
Is September a good time to visit Iasi?
Can you sunbathe in Iasi in September?
Is Iasi rainy in September?
Is it sunny in Iasi in September?
Other cities in Romania
Monthly weather in Iasi
Source of the data
For this page, we’ve looked at the typical weather in Iasi, 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.