The best time to do the Annapurna Circuit trek is during the autumn (September-November) and spring (March-May) seasons. During the autumn season, the weather is dry and stable, and the skies are clear, providing excellent views of the surrounding peaks. The temperature is also mild and comfortable for trekking during the day, although it can get cold at night.
In the spring season, the weather is also pleasant, and the landscape is covered in colorful wildflowers. However, the trails can get quite crowded during this time, especially around the popular villages such as Manang and Pisang.
During the winter season (December-February), the trekking route can be quite challenging due to heavy snowfall and freezing temperatures. Most of the tea houses and lodges along the trail may also be closed during this time, making it difficult to find accommodations.
In the summer season (June-August), the monsoon brings heavy rainfall, making the trail muddy and slippery. The clouds also obscure the views of the mountains, so trekking during this time is not recommended.
It's important to keep in mind that the Annapurna Circuit trek is a high-altitude trek that involves crossing the Thorong La Pass, which stands at 5,416 meters. Therefore, it's essential to check the weather forecast and be prepared for any changes in weather conditions. Additionally, it's recommended to hire a guide or join a trekking group to ensure your safety and maximize your enjoyment of the trek.