Climate averages 1991–2020
Iaşi weather
in September.
A mild, moderately wet month: the 5th warmest and the 9th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Iaşi: daytime highs average 21.5°C and nights cool to about 12.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 50 mm of rain on roughly 7 days, which makes September a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 37 min on an average September day.
The nearest other city in this atlas is Bălţi (71 km away). In September its highs average 21.0°C, 0.6°C cooler than Iaşi, with 57 mm of rain.
Among the 27 cities listed in Romania, Iaşi ranks joint 12th of 27 for the warmest September highs and 5th of 27 for the driest September (rainfall, lowest first). The mean September high of those 27 cities is 21.3°C; Iaşi is 0.2°C warmer than that mean.
From September to October, average highs fall by 6.5°C to 15.1°C, and monthly rainfall falls from 50 mm to 44 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Iaşi climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.5°C-5.3°C | -5.3°C | 28 | 6.5 | 9.09 h |
| February | 3.9°C-4.0°C | -4.0°C | 28 | 6.2 | 10.210 h |
| March | 9.4°C0.0°C | 0.0°C | 36 | 8.6 | 11.912 h |
| April | 16.1°C5.6°C | 5.6°C | 45 | 8.5 | 13.614 h |
| May | 21.8°C11.4°C | 11.4°C | 60 | 10.4 | 15.015 h |
| June | 25.5°C15.7°C | 15.7°C | 75 | 10.7 | 15.816 h |
| July | 27.4°C17.7°C | 17.7°C | 72 | 9.9 | 15.516 h |
| August | 27.1°C17.4°C | 17.4°C | 49 | 7.1 | 14.214 h |
| September, selected | 21.5°C12.6°C | 12.6°C | 50 | 7.1 | 12.613 h |
| October | 15.1°C7.0°C | 7.0°C | 44 | 6.4 | 10.911 h |
| November | 8.3°C2.0°C | 2.0°C | 36 | 5.9 | 9.49 h |
| December | 2.8°C-3.2°C | -3.2°C | 35 | 7.0 | 8.69 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Bălţi in SeptemberMoldova · 71 kmHigh 21.0°C · Low 12.3°C · 57 mm rain
- Bacău in SeptemberRomania · 85 kmHigh 20.9°C · Low 11.8°C · 46 mm rain
- Botoşani in SeptemberRomania · 96 kmHigh 20.4°C · Low 12.0°C · 55 mm rain
- Chisinau in SeptemberMoldova · 97 kmHigh 22.0°C · Low 13.0°C · 48 mm rain
- Piatra Neamţ in SeptemberRomania · 100 kmHigh 18.6°C · Low 9.3°C · 64 mm rain
- Suceava in SeptemberRomania · 114 kmHigh 19.0°C · Low 9.9°C · 56 mm rain
- Bender in SeptemberMoldova · 147 kmHigh 22.1°C · Low 13.4°C · 44 mm rain
- Tiraspol in SeptemberMoldova · 158 kmHigh 22.2°C · Low 13.2°C · 42 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Iaşi) is explained once on the Iaşi year overview and on the Sources, method and limits page.