Weather is probably a major factor when you plan your trip to Halsey, 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 18°C, while the coldest months are February and December, with an average of 5°C. The rainiest months in Halsey are December, November, January and March, with each month seeing an average of 177 mm of rainfall.