The best time to visit Międzyrzecz is generally during the late spring (May to June) and early autumn (September to October) when the weather is pleasant and comfortable for exploring.
During these months, the temperatures are mild, typically ranging from 15°C to 25°C, making it ideal for outdoor activities like visiting the Międzyrzecz Fortified Region or exploring the castle ruins. There's also less rainfall compared to the summer months, and the natural scenery around the lakes and forests is at its most appealing.
Summer (July and August) can also be a good time, especially if you enjoy warmer weather, with temperatures often reaching above 25°C. However, it can occasionally be quite hot, and it's also the peak tourist season, so popular attractions might be busier.
Winter (November to April) in Międzyrzecz can be cold, with temperatures often dropping below freezing, and there's a higher chance of snow.