Weather is probably a major factor when you plan your trip to Grogol, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and September with an average temp of 78°F, while the coldest months are August and September with an average of 77°F. The rainiest months in Grogol are February, March, January, and November, with each month seeing an average of 18 inches of rainfall.