Hoi An is known as a tropical destination so the sun is shining throughout most times of the year. It is best to be prepared with sunscreen and lotion if you are planning to be out in the sun. If you are planning to be basking in the sun while treating your eyes to the stunning view of the merging of the white sky and the blue sea, then it is a must to have sunscreen on you even if you intend to tan your skin. Depending on the month, the Monsoon rains will affect the weather and at times of the year the weather can be unpredictable, so it is wise to have an umbrella with you when you are going sightseeing.