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Chamonix-Mont-Blanc Weather in August
During August, Chamonix-Mont-Blanc experiences pleasant daytime temperatures of 18°C (64°F) and cooler nights around 7°C (45°F). As part of the summer season, expect quite a bit of rainfall. Around 134 mm (5.3 in) is typical.
Rainfall in Chamonix-Mont-Blanc in August
Historically, August sees about 17 days of rain, with a monthly average of 134 mm (5.3 in). Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Chamonix-Mont-Blanc in August
Temperatures in Chamonix-Mont-Blanc in August top out at 18°C (64°F) and drop to 7°C (45°F) overnight. The summer season is characteristic of August. Even when the weather is stable, mornings and evenings can still feel distinctly cool. At 7°C (45°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Chamonix-Mont-Blanc in August
Expect a lot of sunshine this month, with about 230 hours of sun. These sunny conditions add to the overall experience.Our weather planner can help you find worldwide destinations with pleasant weather during this period. July and August typically offer the best weather for Chamonix-Mont-Blanc.
Chamonix-Mont-Blanc Temperature in August
Min Temperature
7°C (45°F)
Max Temperature
18°C (64°F)
Chance of Rain
57%
Precipitation
134 mm (5.3 in)
Rainy days
17 days
Sunshine
230 hours
Percentage Sunshine
Chamonix-Mont-Blanc Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Chamonix-Mont-Blanc - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Chamonix-Mont-Blanc typically stay consistent throughout August, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 12°C (54°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather records for Chamonix-Mont-Blanc in August
Browse day-by-day weather records for Chamonix-Mont-Blanc spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Chamonix-Mont-Blanc historical weather extremes in August
Based on 50 years of weather observations in Chamonix-Mont-Blanc between 1976 and 2026, these are the recorded extremes.
- On August 4, 2003, temperatures climbed to 35°C (95°F), marking the warmest August day on record.
- The coldest August day was on August 9, 2007, with a maximum of 5°C (41°F).
- The coldest night in August in Chamonix-Mont-Blanc was on August 25, 1996, with a minimum of -3°C (27°F).
- The wettest day in August Chamonix-Mont-Blanc was on August 9, 2007 with 64 mm (2.5 in) of precipitation.
Best Places in France in August
Find out more about the weather in France and which places have the best travel conditions in this month. See all of France in August →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Chamonix-Mont-Blanc in August
For Chamonix-Mont-Blanc in August, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Chamonix-Mont-Blanc in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Camping3/10 -
Outdoor sports9/10
Chamonix-Mont-Blanc 3-Day Forecast
More climate data for Chamonix-Mont-Blanc
See the full Chamonix-Mont-Blanc climate overview or explore weather in France.
Popular in August
Where to go in August - average daytime high across popular destinations.
Marseille
32°C (90°F) Toulouse
29°C (84°F) Bordeaux29°C (84°F) Lyon28°C (82°F) Cannes27°C (81°F) Nice27°C (81°F) Paris26°C (79°F) Chamonix-Mont-Blanc
18°C (64°F) Bucket list
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