September · Romania
Best time to visit Iași in September Weather, crowds & prices
Weather in Iași in September
Average temperature 18°C, 78 mm of rain, about 11 days with 6+ hours of sunshine and 64% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.0/10
Ranked #5 of 12 months
- Avg temp
- 18°C
- Rainfall
- 78 mm
- Humidity
- 64%
- Days with 6h+ sun
- 11
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Iași scores 8.0/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 18°C, 78 mm of rain, and roughly 11 days with 6+ hours of sunshine this month.
Iași was the capital of Moldavia, and its palaces, churches and university give Romania's east a cultured edge.
September holds up well in Iași — 5th best month
September averages 18°C (65°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 78 mm, so plan one flexible day in three; you still get about 11 days with 6+ hours of sunshine and 12.3 hours of daylight.
It scores 8/10 here, 5th of 12 months, against 9.7/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Figure on mid-season pricing, with crowds are moderate.
Flexible dates? June scores 1.7 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Iași in September?
- In September, Iași averages 18°C, 78 mm of rain, and about 11 days with 6+ hours of sunshine. Its climate-comfort score is 8.0/10.
- Is September a good time to visit Iași?
- September earns a 8.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Iași in September?
- Expect about 78 mm of rain in September. Average humidity is 64% and there are about 11 days with 6+ hours of sunshine.
Curated in Iași
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Iași, Romania. Live activities and tours from GetYourGuide, matched to this destination.