Mull and Iona climate by month
Warmest month: July (highs about 18°C). Coolest: January (about 8°C). Wettest: January (206 mm). Driest: April (92 mm).
Source: Met Office, Dunstaffnage, 1991-2020 averages (Open Government Licence v3.0). Daylight is calculated from the latitude of Mull and Iona for the 15th of each month. Mull has no Met Office climate station; the Met Office names Dunstaffnage, near Oban on the mainland and about 15 km east of Craignure, for the geohash of Craignure. Western Mull and Iona are more exposed to the Atlantic and are not measured by it.