Switzerland Geneva Weather in August — Climate Guide
August in Geneva is very-high
August is very-high for Geneva.
August in Geneva stays warm and busy — averaging about 25°C/15°C, much like July, with peak crowds, lively lakefront life, and the chance of heatwaves and late-summer thunderstorms.
The month opens with Swiss National Day (August 1) and fireworks over the lake. Swimming at the Bains des Pâquis and lake beaches, cruises, lakeside perch dinners, and long warm evenings are all at their best. Every day trip — Mont Blanc/Chamonix, Lausanne and the Lavaux, Annecy, Montreux/Chillon — is in prime summer form.
Travel score
Geneva August Weather Stats
Avg High
25°C
Avg Low
15°C
Rainy Days
9
80mm total
Sunshine
7.5h
Daily avg
Humidity
67%
comfortable
UV Index
7
High
Wind
8 km/h
Gusts 20
Crowds
Very busy
At attractions
August Sunrise & Sunset
Air Quality
PM2.5
19 μg/m³
PM10
34 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
26°C
Nighttime
15°C
Humidity and wind affect how the actual temperature feels.
Wind
8 km/h
Max gust 20 km/h
Activities Recommended for August
August Travel Pros & Cons
Pros
- Warm summer weather + lake life
- Swiss National Day fireworks (Aug 1)
- Swimming and cruises at their peak
- All day trips at their best
Cons
- Peak crowds and prices
- Heatwaves + thundery breaks
- Some local restaurants close for summer holidays
- AC not universal in older hotels
August Events & Festivals
- Swiss National Day (Aug 1) — fireworks over the lake
- Peak summer tourist season continues
- Lake swimming and cruises at their height
- Late-summer thunderstorms possible
Geneva in August — Full Picture
August in Geneva stays warm and busy — averaging about 25°C/15°C, much like July, with peak crowds, lively lakefront life, and the chance of heatwaves and late-summer thunderstorms.
The month opens with Swiss National Day (August 1) and fireworks over the lake. Swimming at the Bains des Pâquis and lake beaches, cruises, lakeside perch dinners, and long warm evenings are all at their best. Every day trip — Mont Blanc/Chamonix, Lausanne and the Lavaux, Annecy, Montreux/Chillon — is in prime summer form.
It remains high season for crowds and prices, so book ahead. Note that many locals take summer holidays, so some smaller restaurants and shops may close for a couple of weeks (especially in the second half of the month).
Note: heat can be intense in heatwaves, AC isn't universal in older hotels, and afternoon thunderstorms occasionally break the warmth.
What to Wear & What to Pack
Warm peak summer — around 25°C/15°C, with heatwaves possible. Light, breathable clothing, a swimsuit, sunglasses, a hat, and SPF. A light layer for evenings and occasional thundery breaks.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
15°C
6.3°C
11/mo
Summer (Jun·Jul·Aug)
Current24.7°C
14.3°C
9.7/mo
Autumn (Sep·Oct·Nov)
15°C
7.7°C
10/mo
Winter (Dec·Jan·Feb)
5°C
0.3°C
10.7/mo
Geneva Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 4° | 0° | 11d·76mm | 2h | 82% | 1 | Quiet | Shoulder | |
| 6° | 0° | 10d·64mm | 3.5h | 78% | 2 | Quiet | Shoulder | |
| 11° | 3° | 10d·65mm | 4.5h | 72% | 3 | Quiet | Shoulder | |
| 15° | 6° | 11d·68mm | 5.5h | 70% | 5 | Moderate | Shoulder | |
| May (Best) | 19° | 10° | 12d·80mm | 6.5h | 70% | 6 | Busy | Peak |
| June (Best) | 23° | 13° | 11d·75mm | 7.5h | 67% | 7 | Busy | Peak |
| July (Best) | 26° | 15° | 9d·73mm | 8h | 64% | 8 | Very busy | Peak |
| August (Best) | 25° | 15° | 9d·80mm | 7.5h | 67% | 7 | Very busy | Peak |
| September (Best) | 21° | 12° | 9d·75mm | 6h | 72% | 5 | Busy | Peak |
| 15° | 8° | 10d·86mm | 4h | 78% | 3 | Moderate | Shoulder | |
| 9° | 3° | 11d·82mm | 2.5h | 82% | 1 | Quiet | Shoulder | |
| 5° | 1° | 11d·81mm | 2h | 84% | 1 | Moderate | Peak |
View Other Months
Geneva August Hotel Picks
Frequently Asked Questions
Is August a good time to visit Geneva?
Geneva in August is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Geneva in August?
Geneva August averages a high of 25°C and a low of 15°C.
Does it rain much in Geneva in August?
Geneva August averages 80mm of rainfall over about 9 rainy days.
What should I wear in Geneva in August?
Warm peak summer — around 25°C/15°C, with heatwaves possible. Light, breathable clothing, a swimsuit, sunglasses, a hat, and SPF. A light layer for evenings and occasional thundery breaks.
What time are sunrise and sunset in Geneva in August?
Geneva August sunrise is 06:30 and sunset is 20:45, with 14h 15min of daylight.
What's the air quality like in Geneva in August?
Geneva August air quality (AQI) averages 47, rated Good. PM2.5 averages 19μg/m³.
What activities are recommended in Geneva in August?
In August, Geneva is great for Swiss National Day fireworks (Aug 1), Lake swimming + cruises, Mont Blanc / Annecy day trips.
Is August peak season in Geneva?
Geneva August crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Geneva
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.