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Daytime temperatures are around 10-20Β°C which seems good for hiking (up to 23Β°C in Tetovo). Nighttime temperatures can drop down to 0-5Β°C.
You could get some rain and thunderstorms during a day but also few sunny days in a row...
If you go hiking for a week in April/May, you are pretty likely to get 1 to 3 days with some rain.
Temperatures source : Accuweather