The overall weather of Interlaken is predictable with months of April to September being the best months to visit this incredible place.
June to September: The best time to visit Interlaken is during the months of June to September, when the weather is pleasant and you can enjoy many outdoor activities like trekking and mountaineering.
October to March: Interlaken witnesses winter during this period. This is the time when the tourist numbers starts dropping with hotel rates and flight prices going down. This is the off season and budgeted travellers should visit Interlaken during this season.
April to May: Weather improves comparatively during this period with frequent rains. Hence, this one is also an ideal time to enjoy a laidback vacation at Interlaken.