Bid adjustments are only available for weather targeting AdWords campaigns. The Facebook weather targeting functionality is more limited in the sense that it only lets you trigger ads and pause ads depending on your rules. 

Facebook doesn't have geo based bid modification inbuilt into the platform in the same way that AdWords does just yet, so WeatherAds is unable to offer an easy way to adjust bids based on weather for Facebook ad sets.

Further Reading: How to Set Up your Facebook or Instagram Campaign for Weather Targeting

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