Isabel, Philippines experiences a relatively consistent temperature year-round. The warmest months are June and May, with average temperatures ranging from 26-29°C, while the cooler months are February and September, averaging 24-27°C. December's temperature averages around 27°C, indicating a mild winter-like period. October brings slightly cooler temperatures, averaging 25-26°C. Overall, Isabel enjoys a warm tropical climate with minimal seasonal variations in temperature.