Norrköping, where it's located

The climate of Norrköping is Baltic, that is, moderately continental, with cold winters, during which the average temperature is a few degrees below freezing, and mild to pleasantly warm summers.
The city is located in southern Sweden, south of Stockholm, on the coast of a fjord.
The average temperature of the coldest month (January) is of -1.8 °C (28.8 °F), that of the warmest month (July) is of 18.4 °C (65.1 °F). However, during polar cold spells, the temperature can drop to -25 °C (-13 °F) or below, while in summer, it can reach 28/30 °C (82/86 °F), although rarely. Here are the average temperatures.
Norrköping - Average temperatures
Min (°C)-4-4-226101312941-2
Max (°C)1161217212422181163
Min (°F)252528364350555448393428
Max (°F)343443546370757264524337

Precipitation amounts to 555 millimeters (21.9 inches) per year: so, it is at an intermediate level. It ranges from 30 mm (1.2 in) in the driest months (February, March, April) to 75 mm (3 in) in the wettest (July). Here is the average precipitation.
Norrköping - Average precipitation

On average, there are around 1,910 sunshine hours per year. Here are the average sunshine hours per day.
Norrköping - Sunshine

The sea temperature ranges between 2 °C (36 °F) and 17 °C (63 °F). So, it never becomes warm for swimming. Here are the average sea temperatures.
Norrköping - Sea temperature
Temp (°C)32236121617141075
Temp (°F)373636374354616357504541


Best Time

The best time to visit Norrköping is the summer, from June to August, since it is the mildest season. However, you must take into account some rainy days and a bit of cold at night.