| Season | Weather | Highlights | Notes |
|---|---|---|---|
| May–June | Warm, 15–22°C, some rain | Spring greenery, festivals, ideal walking weather | Best overall time |
| July–August | Hot, 20–28°C, thunderstorms possible | River activities, outdoor events, long daylight | Peak season, busiest period |
| September–October | Cool, 8–18°C, crisp and clear | Autumn foliage, fewer crowds, harvest festivals | Excellent for photography |
| November–March | Cold, -5 to 5°C, possible snow | Winter atmosphere, Christmas markets | Short days, some attractions close |
Recommendation: Late May through early October offers the best combination of pleasant weather, full attraction access, and vibrant city life. September is particularly magical with golden autumn foliage along the Neman River and fewer tourists than summer.