If weather changes to Rain then activate Nanoleaf to

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Connect

When ever the weather condition changes to Rain then activate my Nanoleaf.

If

Weather Underground icon
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

Nanoleaf Smarter Series icon
Activate a scene

This action will activate the Scene that you choose. You can choose from any Scene that is listed in your Nanoleaf Smarter Series App.

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Discover more time saving integrations for Weather Underground and Nanoleaf Smarter Series