Taking the local weather in Helfenstein into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually August and July, with an average temperature of 14°C, while the coldest months are January and February, with an average of -3°C. The rainiest months in Helfenstein are May, June, July and August, with each month seeing an average of 228 mm of rainfall.