If it begins to rain then change the light colors to blue

If

Current condition changes to

This Trigger monitors changes in the current weather condition. When one of those conditions is met the Trigger fires. Currently only these simple conditions are supported: Rain, Snow, Cloudy, Clear.

Then

Change color

This Action will change the color of your hue lights. NOTE: Accepts color names and CSS hex color values. Defaults to white if no color match is found. NOTE: not compatible with hue lux bulbs.