There will be showers at night, and the clouds will decrease during the day, giving way to sunshine.

According to the Lao Cai Provincial Meteorological and Hydrological Station, on the night of May 20th and the day of May 21st, the weather in the province will be cloudy, with scattered showers and thunderstorms at night, and locally moderate to heavy rain. The day will see decreasing cloud cover and sunny skies. The highlands and mountainous areas will experience cold weather at night and in the morning.

Source: https://baolaocai.vn/dem-co-mua-rao-ngay-giam-may-troi-nang-post899978.html