Two figures are enough to describe this city's climate, and they are worth putting side by side: 45.4 °C recorded in July and −32.2 °C in January. Seventy-seven degrees of range between one extreme and the other. This is not a mild capital that occasionally overshoots: it is an exposed one, in the middle of a plain with no sea and no mountains to soften anything.
01 A plain with nothing to shelter it
Bucharest sits between 56 and 92 metres above sea level, on an open plain in the south of the country. With no relief around it, continental air comes and goes unimpeded: in summer it heats up without brake and in winter it cools the same way. Hence monthly means running from −1.5 °C in January to 23 °C in July, a twenty-five-degree range very few European capitals match.
Rain, by contrast, is moderate and unevenly spread: 648 millimetres a year over only 75.6 days. Which is to say it rains rarely and quite heavily. The wettest month is June, at 83 millimetres over eight days; the driest, February, at 33. The calendar problem here is never water.
Key moments at a glance
4.9 rainy days all month, the year's minimum, with 25 °C and 209 hours of sunshine.
Highs of 18.5 °C and almost 200 hours of sunshine, with the parks freshly green.
Average highs of 30.6 °C on a plain with no breeze. The all-time record is 45.4 °C.
The annual sunshine minimum for the whole month, with highs of only 4 °C.
02 The summer that pushes life into the parks
July and August have average highs of 30.4 and 30.6 °C, and they are the sunniest months of the year, with 293 and 283 hours. In a city of wide boulevards, asphalt and blocks, that heat does not disperse: it accumulates. And since it barely rains —49 millimetres in August, spread over five days— there are no regular storms to cool things down either.
The city's answer is green, and there is plenty of it. Cișmigiu, opened in 1847, works in summer as a public living room; the big parks to the north do the same on another scale. If you come in high August, the sensible plan is the local one: streets early and late, parks in the middle of the day.
03 September, the month with the fewest rainy days
Here is the figure almost nobody checks and that settles the trip. September records 4.9 rainy days on average: the minimum of all twelve months, below even August. And it does so with highs of 25 °C and 209 hours of sunshine. Comfortable warmth, plenty of light, and the year's lowest chance of a day being written off.
October continues it with highs of 18 °C and 150 hours of sunshine, and adds something September does not yet have: the parks turned and the city back at its normal rhythm. Between them they make eight weeks that are, by a distance, the best stretch of Bucharest's calendar.
04 A dry winter without light
A Bucharest winter is textbook continental: dry and dark rather than wet. December totals 64 hours of sunshine for the whole month and January 79, against July's 293. January means sit at −1.5 °C, with lows of −5 °C, and the historic record of −32.2 °C is a reminder of how far the plain can go when cold air arrives from the north-east.
That makes December and January a different trip, not a worse one: museums, cafés and building interiors. But it is worth knowing when you book, because a city you enjoy by looking at facades from the pavement loses much of its point when usable light lasts four hours.
Here winter is not measured in centimetres of snow, but in hours of sunshine that never arrive.
05 The wetland that keeps its own calendar
There is one place in Bucharest where the calendar reads better than on any thermometer: Văcărești, a large reservoir basin that was never finished and which vegetation took over on its own until it became a wetland, now protected as a nature park inside the city.
06 When Bucharest makes the most sense
September, for a reason that goes beyond comfort. This is a city you cover by looking at facades from the opposite pavement: you have to walk slowly, stop, look up. Any month that prevents you doing that for six hours at a stretch —July and August for heat, December and January for lack of light— takes away access to what there is to see.
The rest is preference. April and May give you the city in blossom and the parks freshly green; September and October give you less rain, fewer people and better light for looking up. Between the two windows, autumn wins by a small margin, and it wins for exactly that reason: the number of days the sky does not interrupt.
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