Lagoon amusement park does not typically close when it rains lightly. If it is already open and rain starts, it usually stays open unless there is an extended period of heavy rain or severe weather. Heavy rain can lead to closure of certain rides for safety, but the park as a whole rarely closes due to rain unless conditions are severe or rain is continuous from the start of the day. For example, some outdoor rides may close immediately in heavy rain, but the whole park remains open in most rainy conditions.
Specific lagoon water bodies, like water attenuation lagoons, are designed to hold excess rainwater and do not "close" but rather manage rainwater flow. For recreational sites like the Blue Lagoon in Iceland, closure due to rain is very rare and usually related to extreme wind rather than precipitation.
So in summary, for amusement parks like Lagoon in Utah, rain does not automatically close the park; closures depend on rain intensity and severity over time. For water management lagoons, they do not close but handle rainwater by design. For recreational lagoons like the Blue Lagoon, rain rarely causes closure. If the question is about an amusement park named Lagoon, it mostly stays open in rainy weather but heavy or extended rain can cause ride or park closures for safety. If about water management lagoons, they do not close but control rainwater.
