It is cold and cloudy and brings frequent snowstorms and relatively low total precipitation. The warmest areas in Poland are the Silesia Lowland and Sandomierska Upland, while the coldest spot is in the north-eastern edge of the country in Walk.
The coolest area in July is the mountains, where the air temperature drops as the altitude increases (on average by 0.6 deg. On average, there are only five such days at the Rozelle Cape and over 40 in the Sandier Basin and Lublin Upland.
Leaving meteorology and geography aside, it is useful to know that the weather in Poland is highly unpredictable and varied. As the weather here can be quite unpredictable, to get the best out of your Polish experience it is important to include both an umbrella and sunglasses, necessary equipment all year long.
Summer, from June to August, is mild or pleasantly warm: the average daily temperatures are around 17/19 °C (63/66 °F). However, there is a moderate amount of sunny days, which may be hot, especially when warm currents arrive from the south-east: in these cases, the temperature can reach 30/35 °C (86/95 °F).
The Baltic Sea is very cool, if not cold, even in summer, however, the water temperature reaches 18 °C (64 °F) in August. Precipitation in Warsaw is not abundant, in fact, it amounts to about 530 mm (21 in) per year; the driest seasons are winter and spring, while the rainiest is summer.
The sun in Warsaw and in Poland is rarely seen from November to February, while in summer, it shines for a moderate amount of hours, although it can be obscured not only by Atlantic disturbances but also by afternoon cloudiness, which can sometimes lead to thunderstorms. In southern Poland, where mountain ranges such as the Suites and the Tatars are found, the climate is naturally colder.
In Zakopane, a popular tourist resort, at 850 meters (2,800 ft) above sea level, the average temperature ranges from -5 °C (23 °F) in January to 15 °C (59 °F) in July. The highest peak in the country is Mount Rosy, 2,503 meters (8,212 feet) high, on the border with Slovakia.
Here are the average temperatures of Mount Snail, the highest among the “Giant Mountains” (or Karkonosze), located at 1,600 meters (5,300 ft) of altitude, in the southwest of the country, at the border with the Czech Republic. In February 1956, the longest postwar cold spell in many European countries, the temperature dropped to -31 °C (-24 °F) in Wrocaw and Piece, -30 °C (-22 °F) in Gdask and Katowice, -29 °C (-20 °F) in Lublin and Szczecin, -27 °C (-16.5 °F) in ód, and -26 °C (-15 °F) in Warsaw.
In January 1963, the temperature dropped to -31 °C (-24 °F) in Lublin and ód, -29 °C (-20 °F) in Bialystok, -28 °C (-18.5 °F) in Warsaw, -27 °C (-16.5 °F) in Wrocaw, -26 °C (-15 °F) in Katowice, and -24 °C (-11 °F) in Gdask. The cold wave of January 1987 was in Poland, and in some areas of Northern Europe, the worst after the war, at least in intensity.
The temperature dropped to -34.5 °C (-30 °F) in Bialystok (in the north-east), -32 °C (-25.5 °F) in Lublin (in the south-east), -31 °C (-24 °F) in Jelena Gorey, Katowice and Warsaw, -30 °C (-22 °F) in Kraków, Gdask, ód and Szczecin, -29.5 °C (-21 °F) in Wrocaw, and -28.5 °C (-19.5 °F) in Poznan. In January 2006, the temperature dropped to -30 °C (-22 °F) in ód, -29 °C (-20 °F) in Katowice, -27.5 °C (-17.5 °F) in Lublin, -27 °C (-16.5 °F) in Kraków and Warsaw, -26.5 °C (-15.5 °F) in Poznan, -26 °C (-15 °F) in Bialystok and Szczecin, -22.5 °C (-8.5 °F) in Wrocaw, -21 °C (-6 °F) in Gdask, and -20 °C (-4 °F) in Swinoujscie.
In February 2012, the temperature dropped to -30 °C (-22 °F) in Bialystok, -28 °C (-18.5 °F) in Jelena Gorey, -27 °C (-16.5 °F) in Gdask and Katowice, -25 °C (-13 °F) in Szczecin, -23 °C (-9.5 °F) in Kraków and Warsaw, and -22 °C (-7.5 °F) in Swinoujscie and ód. In summer, Poland is not particularly prone to heat waves, due to its high latitude, however there can sometimes be hot periods, usually lasting a few days, in which the temperature can reach 33/34 °C (93 °F) or even more.
Between the end of July and the beginning of August 1994, the temperature reached 38 °C (100.5 °F) in Szczecin, 37.5 °C (99.5 °F) in ód and Swinoujscie, 37 °C (98.5 °F) in Wrocaw and Poznan, 36 °C (97 °F) in Jelena Gorey and Warsaw, 35.5 °C (96 °F) in Bialystok, 35 °C (95 °F) in Gdask and Katowice, and 34 °C (93 °F) in Lublin. In August 2013, the temperature reached 37 °C (98.5 °F) in Kraków, Katowice, ód and Warsaw, 36 °C (97 °F) in Wrocaw, 35 °C (95 °F) in Lublin, 34.5 °C (94 °F) in Swinoujscie, and 34 °C (93 °F) in Szczecin.
In August 2015, the temperature reached 38 °C (100.5 °F) in Wrocaw, 37 °C (98.5 °F) in Poznan and Warsaw, 36 °C (97 °F) in Kraków, Jelena Gorey and Szczecin, 35 °C (95 °F) in Katowice and Lublin, 34.5 °C (94 °F) in Bialystok, 34 °C (93 °F) in Swinoujscie, and 33 °C (91.5 °F) in Gdask. Between the end of June and the beginning of July 2019, there was a very short and early heatwave, which brought 38 °C (100.5 °F) in Poznan and Swinoujscie, 37 °C (98.5 °F) in Wrocaw, 36 °C (97 °F) in Kraków and Warsaw, 35 °C (95 °F) in Katowice, Lublin and Szczecin, and 34 °C (93 °F) in Gdask.
The best time to visit Poland is summer, from June to August, however, you can generally go in the warm season, from mid-May to mid-September. In winter: bring very warm clothes, a fleece, a down jacket, a hat, gloves, a scarf, and a raincoat or umbrella.
It lies in Eastern Europe, north of the Czech Republic and Slovakia and has a coastline upon the Baltic Sea. The country is mainly covered by low-lying rolling plains below 1000 ft, but in the southwest and east, you will find mountain ranges which rise above 4000 feet.
In the low-lying regions, the biggest factor affecting weather conditions is proximity to the Baltic Sea. Comparisons between Warsaw and Kraków will probably be the best way to illustrate the weather differences between northern and southern Poland.
Warsaw is Poland the largest city and also it's capital, lying on the Vistula River, about 370 kilometers from the Baltic Sea and the Carpathian Mountain range. From June to August is the wettest time of the year with average monthly precipitation being 60 to 70 mm, compared with 20 to 30 mm in December and January.
Kraków lies in the south of Poland, where colder temperatures prevail year-round; it witnesses between 23 and 58 days below freezing across the year. In the summer the city is hit by the western blowing winds which bring rainfall and thunderstorms.
Conversely, the winter sees easterly blowing winds which clear the skies and decrease precipitation. Temperatures rise gradually and reach a peak average high of 23°C through July and August.
Rainfall is considerably higher in Kraków when compared with Warsaw, with July and August each seeing average monthly precipitation of 80 to 100 mm. The best time of the year to visit Poland is during the summer months, as daily hours of sunshine are higher, the days are longer and, of course, its warmer.