Argyll and Loch Lomond mountain weather in August.
Typical mountain and low-level wind, temperature and rainfall for August, based on 40 years of weather history.
What is Argyll and Loch Lomond weather like in August?
Historically, August has been a mixed and often challenging month on the high ground. Of 1,240 representative high-ground days, 19% were excellent or good, 57% were average, and 24% were poor or severe.
Dry days accounted for 38% of the sample, while extensive cloud affected 62%. These figures describe representative high ground around 1,011 metres, so coastal and low-level conditions can be milder.
Low-level weather around Arrochar in August.
Arrochar, at roughly 15 metres, provides a practical low-level reference for Argyll and Loch Lomond. Across 1,240 historical days, the typical daytime high was 17.7°C, with warmer days around 19.8°C.
About 38% of days were dry and 38% combined dry weather with lighter winds. Conditions vary across glens, coasts and villages, so this should be used as regional trip-planning guidance rather than a forecast for every location.
Choose an area and week.
Saturday dates are highlighted because they usually unlock the widest choice of seven-night cottage stays. Other arrival days still work.
What this week is typically like on Argyll and Loch Lomond high ground.
Across 280 comparable historical hill days, 15% were excellent or good and 29% were poor or severe.
Check the live Argyll and Loch Lomond forecast →August context: 19% of days across the month were excellent or good; 24% were poor or severe. Read the full August guide.
Around Arrochar.
Representative base · 15 mArgyll and Loch Lomond weather by month.
Each month has a detailed guide comparing high-ground hill days with typical conditions at a representative valley or low-level trip base.
Best weeks of the year for Argyll and Loch Lomond mountain weather.
These are the six week bands with the largest historical share of excellent or good days. They are useful for broad trip timing, but the live forecast should decide the final plan.
- 01Week around 1 May29% excellent or good · 15% poor or severePlan this week →
- 02Week around 29 May28% excellent or good · 18% poor or severePlan this week →
- 03Week around 8 May28% excellent or good · 21% poor or severePlan this week →
- 04Week around 17 April27% excellent or good · 18% poor or severePlan this week →
- 05Week around 22 May26% excellent or good · 21% poor or severePlan this week →
- 06Week around 15 May25% excellent or good · 22% poor or severePlan this week →
Compare another part of the UK.
Each page includes weekly and monthly high-ground and low-level climate summaries, a highlighted Saturday planner and nearby accommodation.