If that doesn't make a difference, go into the application manager/manage applications in your device settings and locate the Google Play app and then clear the cache for Play.
This should force the Play app to re-query its database for purchases.
- If the issue persists, follow these steps.
Open 1Weather>Menu>remove Ads. Now press $1.99 in the dialogue box that appears, this step will typically make google play recognize your purchase. Please note that you do not have to purchase the app again.
Would you mind reaching out with the screenshot of your proof of purchase to us at firstname.lastname@example.org if you still face issues?