Weather in Geneva 🇨🇭
Monthly weather averages & travel planning
September
Avg Temp
20°C
Rain Days
12 days
Sun Hours
10 hrs
Humidity
65%
Europe › 🇨🇭 Switzerland › Geneva
Updated: March 2026
Is September a Good Time to Visit Geneva?
6/10
Good
September is a good time to visit Geneva (6/10). With 10 daily sunshine hours and only 12 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 6th sunniest of the year in Geneva. Culture-focused travellers and those who prefer lighter crowds will find September a practical choice, with prices running lower than peak June without sacrificing all the good weather. October offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Geneva's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.
vs August:24°C avg high
Step off the plane in Geneva in September and the air meets you at around 20°C, a temperature that feels genuinely welcoming after a long flight. By the time evening arrives and temperatures settle near 12°C, the city takes on a different character entirely. With 10 hours of daylight sun on offer, September gives you the raw material for a genuinely memorable trip.
20°C
68°F
Avg High
12°C
54°F
Avg Low
12 days
108 mm total
Rain Days
10h
per day avg
Sunshine
65%
Moderate
Humidity
Temperature in Geneva in September
The 8°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Winds are calm at an average 10 km/h, so wind-chill is not a factor in planning your clothing. In Fahrenheit: 68°F average high, 54°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ mm
What to Wear in Geneva in September
Morning12°CBefore the day warms up
Afternoon20°CPeak daytime temperature
Evening15°CAfter sunset cools down
Packing for Geneva in September means dressing for 20°C days and 12°C evenings. A light cotton tee with a casual overshirt works well at 20°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 12°C, a modest 8°C drop that a light cardigan or denim jacket covers. European cobblestones reward low-profile walking shoes over flip-flops or heels, with cushioned trainers or leather walking shoes being the practical choice. A compact foldable umbrella weighs almost nothing and earns its keep across 12 potential rainy days.
Local tip: Geneva's cobbled streets turn slippery in the rain. Waterproof walking shoes with a non-slip sole outperform fashionable footwear on wet stone, and you'll cover significantly more ground in comfort.
Events in Geneva in September
September has no major festivals or public holidays in Geneva, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.
What to Pack for Geneva in September
Based on 20°C average highs and 12 rainy days
- Light jacket or cardigan for cooler evenings
- Mix of short and long-sleeve layers
- Comfortable walking shoes with good arch support
- Compact folding umbrella
- Waterproof outer layer or packable rain jacket
- Quick-dry clothing that recovers fast after a shower
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Geneva in September
- Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 20°C, the temperature is ideal for extended walking without overheating
- Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
- Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
- Day trip to the surrounding countryside or coastFull day (depart by 8am)September is reliably dry enough for rural day trips without weather risk
- Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
- Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
- Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningSeptember brings distinct seasonal changes to public green spaces worth exploring
- Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmSeptember seasonal produce is at peak availability, offering dishes not found at other times of year
Why is Geneva mild in September?
September brings the first meaningful shift toward cooler conditions in Geneva, as the sun angle drops and day length shortens. Temperatures averaging 20°C by day and 12°C overnight are still comfortable by most standards, but the trend is clearly downward. At 46 degrees north latitude, autumn light has a particular quality: lower in the sky and warmer in tone, it gives the city a photogenic quality quite different from summer. Conditions remain excellent for outdoor activity, and crowds thin compared to the summer peak. Climate data: Open-Meteo ERA5 (1991–2020).
Sunshine Hours
The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.
UV Index
A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate, wear sunscreen. UV 6-7: High, hat and SPF 30+ essential. UV 8-10: Very High, limit midday exposure. UV 11+: Extreme, seek shade between 10am-4pm.
Rain Days
A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.
Humidity
Relative humidity as a percentage. Below 40%: Dry, skin and throat may feel parched. 40-60%: Comfortable, ideal for most people. 60-80%: Sticky, light breathable fabrics recommended. Above 80%: Muggy, heat feels more intense; quick-dry clothing is essential.
Frequently Asked Questions
Geneva in September
In September, Geneva experiences average highs of 20°C (68°F) and lows of 12°C (54°F). Expect around 12 rainy days and 10 hours of sunshine per day, with humidity averaging 65%. The 8°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 6, so sun protection is advisable on clear days.
Geneva typically sees 12 rainy days in September, with total precipitation of around 108mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Geneva typically sees 4-6 fewer rain days than September.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Geneva in September. Daytime temperatures of 20°C are pleasant, but the evening drop to 12°C means a jacket is essential if you plan to be out after dark. With 12 rainy days, bring a compact umbrella or waterproof jacket for unexpected showers. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
September is a reasonable time to visit Geneva. Expect 12 rainy days, so pack a light rain layer for flexibility. Average temperatures of 20°C make outdoor exploration comfortable during the dry periods. With 10 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Geneva in September is 20°C (68°F), and the average low is 12°C (54°F). The mean daily temperature is approximately 16°C (61°F). The day-to-night range of 8°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Geneva is generally February. February offers the most sunshine at 7 hours per day and only 11 rainy days. Average temperatures reach 7°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around February gives you the best chance of dry, bright weather.
September is shoulder or low season in Geneva, meaning fewer tourists and generally lower prices than peak months. With 10 sunshine hours and 12 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In September, Geneva suits a range of activities thanks to mild temperatures around 20°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 10 hours of sunshine, parks and waterfront walks are particularly enjoyable.
September ranks 6th sunniest of the year in Geneva, with an average 10 daily sunshine hours. The driest months are February, August, and September. July is the hottest month (24°C avg high); January is the coolest (5°C). From here, temperatures fall 4°C into October. Compared to last month (August: 24°C high, 12 rain days), September is cooler and equally dry. September sits in the middle of the annual sunshine ranking for Geneva, offering a reasonable balance of good weather and manageable crowds.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 5°C | -1°C | 13 | 6h | View |
| February | 7°C | 0°C | 11 | 7h | View |
| March | 11°C | 2°C | 13 | 9h | View |
| April | 15°C | 5°C | 13 | 10h | View |
| May | 19°C | 10°C | 16 | 11h | View |
| June | 22°C | 13°C | 14 | 12h | View |
| July | 24°C | 16°C | 13 | 12h | View |
| August | 24°C | 16°C | 12 | 11h | View |
| September | 20°C | 12°C | 12 | 10h | View |
| October | 16°C | 8°C | 12 | 8h | View |
| November | 10°C | 3°C | 13 | 6h | View |
| December | 6°C | 0°C | 13 | 5h | View |
January
13 rain days, 6h sun
5°-1°
February
11 rain days, 7h sun
7°0°
March
13 rain days, 9h sun
11°2°
April
13 rain days, 10h sun
15°5°
May
16 rain days, 11h sun
19°10°
June
14 rain days, 12h sun
22°13°
July
13 rain days, 12h sun
24°16°
August
12 rain days, 11h sun
24°16°
September
12 rain days, 10h sun
20°12°
October
12 rain days, 8h sun
16°8°
November
13 rain days, 6h sun
10°3°
December
13 rain days, 5h sun
6°0°
Other Months in Geneva
Plan Your Trip to Geneva
Nearby Destinations
Cities within 500 km with comparable weather conditions
Data Sources for Geneva
Climate normals represent 30-year averages (1991-2020). Individual years may vary.