Wildhaus-Alt St. Johann is a municipality in the Wahlkreis (constituency) of Toggenburg in the canton of St. Gallen in Switzerland.

The wettest month is August during which time Wildhaus receives an average of 202 mm (8.0 in) of rain or snow.

The month with the most days of precipitation is June, with an average of 15.8, but with only 199 mm (7.8 in) of rain or snow.

The driest month of the year is October with an average of 100 mm (3.9 in) of precipitation over 14.7 days.

[7] The paleolithic cave, Wildenmannlisloch in Alt St. Johann and the birthplace of the Reformer Huldrych Zwingli at Lisighus 167 in Wildhaus are listed as Swiss heritage sites of national significance.