1. Weather conditions that are variable, unpredictable, or changeable, often characterized by clouds, wind, and possible rain or storms without a clear pattern
The forecast predicts unsettled weather for the next few days, so you should bring an umbrella.
A previsão indica tempo instável para os próximos dias, então você deve levar um guarda-chuva.
2. Atmospheric conditions that are unstable and prone to sudden changes in temperature, precipitation, or wind patterns
Unsettled weather made it difficult for the farmer to plan his harvest.
O tempo instável dificultou o planejamento da colheita do agricultor.