As with much of the British Isles, Onich experiences a maritime climate with cool summers and mild winters. Rainfall is high, approaching an annual average of 2,000 mm (80 in). Onich holds the record for highest temperature reported, 32.1 °C (89.8 °F),[5] for this part of Scotland (also the furthest north such a high value has been recorded in the British Isles). It also holds the highest Scottish minimum temperature for July at 20.0.C set in July 1948.
Climate data for Onich 1971-2000, 12 m (39 ft) asl (Sunshine, Rainfall and Extremes, 1951-1980)