Fort William has a cool, wet, and maritime climate with significant rainfall year-round. Summers (June-August) are mild with temperatures around (59°F–62°F), while winters (Dec-Feb) are cold, dark, and very wet, with highs around 6°C–9°C. May is often the sunniest, driest month, while November to January are the wettest, cloudiest months. 

Monthly Weather Breakdown (Average Conditions)

• January: Coldest and one of the wettest months, with frequent overcast skies. Temperatures average around 2°C–6°C.
• February: Very similar to January; cold and wet, with potential for snow in the surrounding hills.
• March: Temperatures begin to rise slightly, but it remains wet and changeable.
• April: A drier, clearer month with increasing sunshine, making it one of the better months for hiking.
• May: One of the best months to visit. It is often the sunniest, with warmer temperatures and lower rainfall.
• June: Mild and pleasant, often with long daylight hours for outdoor activities.
• July: Typically the warmest month (highs up to 24°C possible, average ~17°C–20°C).
• August: Warm and often wet, but popular for visitors with plenty of sunshine between rain showers.
• September: Temperatures begin to fall, but it remains relatively mild, with beautiful autumn foliage.
• October: Increased rainfall and cooling temperatures mark the start of the wet season.
• November: Often the wettest month of the year, with high winds and low temperatures.
• December: Very wet, windy, and dark, with freezing temperatures frequently on high ground. 

Key Takeaways

• Wettest Months: November, December, January, and October.
• Driest/Sunniest Months: April, May, and June.
• Temperature Range: Average highs range from roughly 6°C in winter to 18°C+ in summer.
• Visitor Tips: Always bring waterproof gear regardless of the month. May and September often offer the best balance of decent weather and fewer crowds.