Weather will likely play an important role when you plan your trip to Arbo, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 19°C, while the coldest months are February and January, with an average of 10°C. The rainiest months in Arbo are December, October, November and January, with each month seeing an average of 255 mm of rainfall.