Halmstad, where it's located

The climate of Halmstad is Baltic, that is to say, relatively continental, with cold winters and mild summers.
The city is located on the southwestern coast of Sweden, in Halland county, in an area more exposed to Atlantic air masses, and therefore relatively mild and rainy. However, during polar cold spells, the temperature can drop to -20 °C (-4 °F) or below, while in summer, it can reach 28/30 °C (82/86 °F), although rarely.
The average temperature of the coldest month (January) is of -0.2 °C (32 °F), that of the warmest month (July) is of 18.1 °C (64 °F). Here are the average temperatures.
Halmstad - Average temperatures
Min (°C)-2-2-1271013131053-1
Max (°C)2261317202322181274
Min (°F)282830364550555550413730
Max (°F)363643556368737264544539

Precipitation amounts to 795 millimeters (31.3 inches) per year. It ranges from 40 mm (1.6 in) in the driest month (February) to 90 mm (3.5 in) in the wettest (September). Here is the average precipitation.
Halmstad - Average precipitation

The sea temperature ranges between 2 °C (36 °F) and 18 °C (64 °F). So, it never becomes warm for swimming. Here are the average sea temperatures.
Halmstad - Sea temperature
Temp (°C)323611151818151285
Temp (°F)373637435259646459544641


Best Time

The best time to visit Halmstad 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.