Monthly climate guide
Iași weather in September
September in Iași is typically warm, with average daytime highs around 25°C (76°F) and night-time lows near 12°C (53°F). The month usually brings about 33 mm of rain (fairly dry) and is often cloudy. Daytime highs are 5°C cooler than August and 8°C warmer than October.
What stands out in September
- Iași is usually about 2°C cooler than Galaţi, 200 km away, in September.
- Seasonally, September counts as early autumn in Iași.
- Evenings cool off sharply: the daily range is around 13°C, so pack a layer.
- Temperatures are falling — expect highs around 8°C lower by October.
Avg high
25°C
76°F
Avg low
12°C
53°F
Rainfall
33 mm
fairly dry
Humidity
58%
relative
Sky
55%
cloud · often cloudy
Iași weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 1°C / 33°F | -6°C / 21°F | 30 mm | 89% | 78% |
| February | 3°C / 38°F | -5°C / 23°F | 33 mm | 87% | 77% |
| March | 10°C / 50°F | -1°C / 31°F | 37 mm | 77% | 67% |
| April | 17°C / 63°F | 5°C / 40°F | 52 mm | 70% | 61% |
| May | 22°C / 72°F | 10°C / 51°F | 71 mm | 68% | 61% |
| June | 26°C / 80°F | 15°C / 59°F | 95 mm | 67% | 59% |
| July | 29°C / 84°F | 17°C / 62°F | 62 mm | 60% | 52% |
| August | 30°C / 85°F | 17°C / 62°F | 33 mm | 54% | 40% |
| September | 25°C / 76°F | 12°C / 53°F | 33 mm | 58% | 55% |
| October | 16°C / 62°F | 5°C / 42°F | 56 mm | 73% | 63% |
| November | 9°C / 48°F | 1°C / 33°F | 35 mm | 84% | 75% |
| December | 3°C / 37°F | -4°C / 25°F | 36 mm | 89% | 76% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- An extra layer — evenings are noticeably cooler than afternoons
Is September a good time to visit Iași?
Compare the months in the chart above to find your ideal window.
Best time to visit Iași →Other Romania cities in September
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Iași weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/romania/iasi/september
<a href="https://weathercompare.eu/weather/romania/iasi/september">Iași weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/romania/iasi" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Iași weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/romania/iasi/september">Iași weather in September</a> – WeatherCompare</p>
Iași in September: quick answers
Is September a good time to visit Iași?
Yes. September is one of the best months for Iași, with highs around 25°C and about 33 mm of rain.
How warm is Iași in September?
Average highs are about 25°C (76°F) and average lows about 12°C (53°F), based on 10 years of daily data.
Does it rain a lot in Iași in September?
Iași typically gets around 33 mm of rain in September — fairly dry.
Figures are long-term averages for the area around Iași (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.