What to expect from the Highland weather, how to deal with midges, and what to pack for a trip to Loch Tay.
The Scottish Highlands are famous for changeable weather. Loch Tay is no exception — but being prepared means the weather is part of the adventure rather than a problem.
Weather at Loch Tay
Temperature
- Summer (June–August): 12–20°C typical. Occasional warm spells to 25°C. Cool evenings.
- Spring/Autumn: 5–14°C. Very variable.
- Winter (December–February): -2 to 7°C. Mountain tops significantly colder. Frost and snow common.
Rainfall
The western end (Killin) is wetter than the eastern end (Kenmore), as it catches more rain from the prevailing westerlies. Average annual rainfall is around 1,500–2,000mm. Rain is possible in any month.
Wind
The loch can funnel wind, particularly from the southwest. This affects watersports — always check conditions before going on the water.
Mountain Weather
Conditions on Ben Lawers and the Munros can be dramatically different from the valley. Temperature drops roughly 1°C per 150m of altitude, wind increases, and cloud is common. Always check the Mountain Weather Information Service (MWIS) forecast.
The Midge Question
Scottish midges (Culicoides impunctatus) are tiny biting flies that are the bane of summer visitors. Key facts:
- Season: Late May to September, peaking July/August
- Worst conditions: Calm, overcast, warm, damp — usually dawn and dusk
- Best defence: Wind (any breeze above about 7 mph keeps them away)
- Midge repellent: Smidge is highly effective. Avon Skin So Soft is the traditional Highland choice.
- Head nets: Effective for walking in midge-heavy conditions
- Midge forecast: Check smidgeup.com for daily forecasts
- They don’t bite everyone equally — some people are barely bothered while others suffer badly
What to Pack
Essential
- Waterproof jacket and trousers (proper quality, not a flimsy raincoat)
- Layers — base layer, mid-layer, outer layer
- Walking boots or shoes
- Hat and gloves (yes, even in summer for hill walks)
- Sunscreen (UV can be strong on clear days)
- Midge repellent (May–September)
- Day pack for walks
Recommended
- Binoculars (wildlife, views)
- Camera
- Ordnance Survey map of the area
- Reusable water bottle
- Torch/head torch (essential for winter, useful year-round)
- Swimsuit (for wild swimming — a wetsuit if you plan more than a quick dip)
For Mountain Days
- Map and compass (and the skill to use them)
- Full waterproofs
- Extra warm layers
- Emergency food
- First aid basics
- Phone (charged, in a waterproof case)