Iaşi Weather in September
September in Iaşi brings high temperatures, with daytime highs of 23°C (73°F) and nights around 12°C (54°F). The perfect weather makes it a solid choice for a visit.
Rainfall in Iaşi in September
Records from the past 30 years suggest around 8 days of rain, with 53 mm (2.1 in) average for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Iaşi in September
The perfect temperature in Iaşi in September makes it a solid month to visit, with 23°C (73°F) during the day and 12°C (54°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Iaşi in September
The month enjoys around 201 hours of sunshine, creating mostly sunny days with good weather conditions.
Wind Speed in Iaşi in September
September sees wind speeds averaging 2 m/s (4 knots). You'll typically experience pleasant light breezes that move leaves slightly and feel refreshing. As an average, expect variation from very calm days to periods with more apparent air movement.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Iaşi.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Romania, check out our Iaşi's climate page.
Iaşi Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
23°C (73°F)
Chance of Rain
27%
Precipitation
53 mm (2.1 in)
Rainy days
8 days
Humidity
66%
Windspeed
2 m/s (4 knots)
Sunshine
201 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Iaşi typically drop from around 24°C (75°F) at the start of September to approximately 20°C (68°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 14°C (57°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Iaşi in September
Browse day-by-day weather records for Iaşi spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Iaşi historical weather extremes in September
Based on weather observations in Iaşi between 1976 and 2025, these are the recorded extremes during September.
- Iaşi recorded its highest September temperature of 37°C (99°F) on September 1, 2015.
- Iaşi registered its coldest September night on September 29, 1977, with temperatures dropping to -3°C (27°F).
Best Places in Romania in September
Find out more about the weather in Romania and which places have the best travel conditions in this month. See all of Romania in September →
perfect weather
pleasant
tolerable
unpleasant
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What to Wear in Iaşi in September
For Iaşi in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Iaşi in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Romania, check out our Iaşi's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Iaşi climate overview or explore weather in Romania.
