Simply put, no. Your Microlight Jacket is not waterproof.
The Microlight Alpine Jacket is designed for alpine climbers who want something light and packable that protects them against wind and snow.
It does have a DWR (Durable Water Repellent) coating that will deflect snow, but we don't advise wearing this out in the rain. Pop a waterproof over the top if you want to stay dry.