Goteborg, where it's located

The climate of Gothenburg (Göteborg) is Baltic, that is to say, relatively continental, with cold winters and mild summers.
The city is located on the south-western coast of Sweden, on the strait that separates it from Denmark (Kattegat), and is exposed to ocean currents, therefore it is milder, but also rainier, than the rest of the country (but Malmö, in the far south, is even milder). However, the temperature drops below -5 °C (23 °F) for 40 days a year, and below 0 °C (32 °F) for 100 days. At worst, the temperature can drop to -20 °C (-4 °F) or below. In summer, there are 13 days with a temperature above 25 °C (77 °F), while 30 °C (86 °F) are reached very rarely.
The average temperature of the coldest month (February) is of -1.5 °C (29 °F), that of the warmest month (July) is of 17 °C (63 °F). Here are the average temperatures.
Gothenburg - Average temperatures
Min (°C)-3-4-127111312962-2
Max (°C)1151016202121161263
Min (°F)272530364552555448433628
Max (°F)343441506168707061544337

Precipitation amounts to 760 millimeters (29.9 inches) per year. It ranges from 40 mm (1.6 in) in the driest months (February, April) to 85 mm (3.3 in) in the wettest (October). Here is the average precipitation.
Gothenburg - Average precipitation

On average, there are around 1,755 sunshine hours per year. Here are the average sunshine hours per day.
Gothenburg - Sunshine

The sea temperature ranges between 3 °C (37 °F) and 18 °C (64 °F). So, it never becomes warm for swimming. Here are the average sea temperatures.
Gothenburg - Sea temperature
Temp (°C)433611151718151295
Temp (°F)393737435259636459544841


Best Time

The best time to visit Gothenburg 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.