As the old Scottish saying goes, 'bad weather doesn't exist, just the wrong clothes!' However beautiful Scotland is, the island's turbulent climate can be difficult to predict. January and February are generally the coldest months in Scotland when daytime temperatures average between 5 °C and 7 °C. July and August are normally the warmest months in Scotland, with an average temperature of around 19 °C.
The combination of mountainous landscapes and sustained winds from the Atlantic Ocean make the West Highlands one of the wettest and most windy places in all of Europe. Or, as we like to call it, atmospheric!
This is in contrast to the east of the country, from Inverness aside to Aberdeenshire and down to Angus, Fife, and the Lothians, where there is about as much (or less) rainfall as in New York, Barcelona, Rome, and even Rabat in Morocco.
Conclusion: Generally speaking, summer is the best time for your walking holiday in Scotland, but bring your raincoat with you just in case!