Taking the local weather in San Jose 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 July and June, with an average temperature of 20°C, while the coldest months are January and December, with an average of 1°C. The snowiest months in San Jose are December, March, November and January, with each month seeing an average of 14 cm of snowfall.