Overview: ZermattZermatt (Switzerland) is a place with a cold climate. The day temperatures range from -6 °C (21 °F) in January to 11 °C (52 °F) in August. The highest night temperatures could be experienced in August with 5 °C (41 °F), the lowest in January with -12 °C (10 °F). The driest month is February with just 8 days of rain, on the contrary, the month when it rains the most is May with 11 days of rain.