Use 'gusty' to describe weather, especially in forecasts or when talking about wind. The weather report warns of gusty conditions tomorrow.
Pro Tip 2/3
Suddenness
'Gusty' implies sudden, intermittent bursts of wind, not a constant breeze. The picnic was interrupted by gusty winds that made it impossible to keep the tablecloth in place.
Pro Tip 3/3
Outdoor Activities
Use 'gusty' when planning or discussing outdoor activities that might be affected by wind. We should reconsider our sailing trip because of the gusty forecast.