As this place lies on an elevated point on a hill, the temperature here is usually low. During summer season is the ideal time to visit this place as it would also be like a summer getaway for you. The ideal months to visit Raigad Fort would be between the months of April to September.
During the other parts of the year, the mercury tends to drop in this place and so it is better to avoid visiting this place during winter which begins from November and goes well into February.