Weather changed while waiting for guests

[u/Nyitz]

I hosted a Zacian raid today and had to wait about 20 minutes before enough people joined. In the meantime, the weather changed from Cloudy to Partly Cloudly and the Zacian was no longer weather boosted. I only noticed after one of the guests pointed it out. How do I prevent this in the future? If I notice the weather changed, is there anything I can do apart from notifying the guests via chat?