Iaşi climate
Iaşi (Romania) has a hot-summer humid continental climate (Köppen Dfa). The average temperature over the year is 11 °C52 °F, and about 576 mm23 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Iaşi climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 133 | −621 | −327 | 321.3 | 29 |
| Feb | 338 | −523 | −131 | 311.2 | 25 |
| Mar | 1050 | −131 | 541 | 361.4 | 18 |
| Apr | 1763 | 541 | 1152 | 491.9 | 4 |
| May | 2374 | 1152 | 1763 | 622.5 | 0 |
| Jun | 2781 | 1660 | 2170 | 853.3 | 0 |
| Jul | 3086 | 1864 | 2475 | 763.0 | 0 |
| Aug | 3086 | 1763 | 2374 | 461.8 | 0 |
| Sep | 2475 | 1253 | 1864 | 381.5 | 0 |
| Oct | 1661 | 542 | 1152 | 512.0 | 4 |
| Nov | 948 | 133 | 541 | 351.4 | 13 |
| Dec | 236 | −424 | −130 | 351.4 | 27 |
| Year | 3086 | −621 | 1152 | 57623 | 120 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 89% | 76% | 1.2 | 8:53 |
| Feb | 86% | 77% | 1.9 | 10:12 |
| Mar | 77% | 68% | 3.2 | 11:45 |
| Apr | 70% | 62% | 4.5 | 13:33 |
| May | 67% | 61% | 5.6 | 15:03 |
| Jun | 64% | 60% | 6.0 | 15:54 |
| Jul | 60% | 54% | 6.0 | 15:33 |
| Aug | 57% | 46% | 5.4 | 14:13 |
| Sep | 62% | 59% | 3.8 | 12:29 |
| Oct | 74% | 63% | 2.4 | 10:46 |
| Nov | 85% | 76% | 1.2 | 9:15 |
| Dec | 89% | 77% | 0.9 | 8:30 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Iaşi is like
The warmest month is July, with an average high of 30 °C86 °F and a low of 18 °C64 °F. The coldest is January, when highs average 1 °C33 °F and lows −6 °C21 °F. Seasons are strongly marked: the warmest month is on average 26.6 °C47.8 °F warmer than the coldest.
Annual precipitation is moderate at about 576 mm23 in. The wettest three-month stretch is May–July, which brings 39% of the annual total. The wettest month is June (85 mm3.3 in), the driest is February (31 mm1.2 in).
Relative humidity ranges from 57% in August to 89% in January. The clearest skies (lowest average cloud amount, 46%) are typical of August. Average wind speed near the ground ranges from 8 km/h (5 mph) in August to 11 km/h (7 mph) in March. Daylight lasts from about 8.5 hours in December to 15.9 hours in June.
A lasting snow cover is typical in December–February. In those months the average snow depth in the reanalysis exceeds 10 cm. It is deepest in January, at about 17 cm.
Best time to visit Iaşi
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May and June and August and September. Average highs then reach 23 °C74 °F to 30 °C86 °F. Precipitation is 38 mm1.5 in to 85 mm3.3 in per month.
The most challenging month is January, which is cold, with average highs of 1 °C33 °F.
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Iaşi
- Winter (December–February) — highs 133 to 3 °C38 °F, lows −621 to −4 °C24 °F, about 33 mm1.3 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 1050 to 23 °C74 °F, lows −131 to 11 °C52 °F, about 49 mm1.9 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 2781 to 30 °C86 °F, lows 1660 to 18 °C64 °F, about 69 mm2.7 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 948 to 24 °C75 °F, lows 133 to 12 °C53 °F, about 41 mm1.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
How Iaşi compares
The nearest larger place is Chisinau, about 97 km to the east. Compared with it, Iaşi has practically the same average temperature. It receives 7% more precipitation (576 mm23 in vs 537 mm21 in). The difference is largest in July (0.9 °C1.6 °F cooler).
World Climates covers 20 places in Romania. By annual mean temperature, Iaşi is the 13th warmest of them. By annual precipitation, it is the 16th wettest. See all of them on the Romania climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Chisinau (Moldova, Dfa), Nyíregyháza (Hungary, Dfa) and Debrecen (Hungary, Dfa).
Nearby places
- Climate in Bălţi 71 km · 10 °C50 °F · 563 mm22 in
- Climate in Bacău 85 km · 11 °C52 °F · 621 mm24 in
- Climate in Chisinau 97 km · 11 °C52 °F · 537 mm21 in
- Climate in Piatra Neamţ 100 km · 9 °C48 °F · 677 mm27 in
- Climate in Tiraspol 158 km · 11 °C52 °F · 516 mm20 in
- Climate in Chernivtsi 177 km · 9 °C49 °F · 712 mm28 in
- Climate in Galaţi 195 km · 12 °C54 °F · 509 mm20 in
- Climate in Brăila 213 km · 12 °C54 °F · 509 mm20 in
Frequently asked questions
What is the warmest month in Iaşi?
July is the warmest month in Iaşi. Its average high is 30 °C (86 °F) and its average low is 18 °C (64 °F).
What is the coldest month in Iaşi?
January is the coldest month. Its average high is 1 °C (33 °F) and its average low is -6 °C (21 °F).
When does it rain the most in Iaşi?
June is the wettest month with about 85 mm (3.3 in) of precipitation. February is the driest with about 31 mm (1.2 in).
What is the best time to visit Iaşi?
Judging by long-term averages, the most comfortable months are May and June and August and September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station. So they can differ from airport records. The gaps are largest on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 185 m, while Iaşi lies at about 66 m. Temperatures on this page were therefore adjusted by +0.8 °C1.4 °F using the standard lapse rate of 6.5 °C per 1,000 m.