Lyss, Switzerland experiences average highs of 15°C (59°F) and lows of 7°C (45°F) throughout the year. Rainfall is frequent, averaging about 14 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have warmed by 1.3°C (2.3°F) across the available records.
Lyss, Switzerland Weather & Climate 2026
Monthly climate averages for Lyss, Switzerland. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Feb–Oct 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.2/10
Best: June, July, August, September, October
UV Index
4
Low
Temperature 15°C / 7°C
Feels Like 14°C / 6°C
Rainy Days 14
Rainfall 99 mm
Sunshine 9 h
Humidity 78%
Wind Speed 11 km/h
Dew Point 7°C
Snow Days 6 days
Frost Days 10 days
Hottest Month
25°C
August
Avg Low16°C
Rain12days
Coldest Month
-1°C
January
Avg High5°C
Rain15days
Driest Month
11days
September
Avg High21°C
Avg Low13°C
Windiest Month
12 km/h
March (Gusts 35)
Worst Time to Visit
Consider avoiding January, February, November, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:36
Daylight 15.9h
Sunset 21:29
Live conditions—
Lyss on the map · live conditions
Lyss, Switzerland
- Continent
- Europe
- Country
- Switzerland
- City
- Lyss
- Population
- 10.9K
- Coordinates
- 47.07°, 7.31°
Seasonal Breakdown
Spring
Mar–May
Avg High 15°C
Avg Low 6°C
Rain 14 days/mo
Summer
Jun–Aug
Avg High 24°C
Avg Low 16°C
Rain 14 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 15°C
Avg Low 8°C
Rain 12 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 7°C
Avg Low 0°C
Rain 14 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 5°C / -1°C . Feb: 9°C / 0°C . Mar: 11°C / 2°C . Apr: 15°C / 5°C . May: 18°C / 9°C . Jun: 23°C / 14°C . Jul: 25°C / 16°C . Aug: 25°C / 16°C . Sep: 21°C / 13°C . Oct: 16°C / 8°C . Nov: 10°C / 3°C . Dec: 6°C / 0°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 107 mm. Feb: 73 mm. Mar: 78 mm. Apr: 85 mm. May: 134 mm. Jun: 108 mm. Jul: 115 mm. Aug: 105 mm. Sep: 88 mm. Oct: 91 mm. Nov: 99 mm. Dec: 102 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 84%. Feb: 79%. Mar: 75%. Apr: 72%. May: 76%. Jun: 74%. Jul: 71%. Aug: 73%. Sep: 78%. Oct: 82%. Nov: 86%. Dec: 87%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 12 km/h . Feb: 12 km/h . Mar: 12 km/h . Apr: 12 km/h . May: 12 km/h . Jun: 10 km/h . Jul: 10 km/h . Aug: 10 km/h . Sep: 10 km/h . Oct: 10 km/h . Nov: 10 km/h . Dec: 10 km/h .
Sunshine
Sunshine
Sunshine: Jan: 5h. Feb: 7h. Mar: 8h. Apr: 10h. May: 10h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 9h. Oct: 7h. Nov: 6h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 2. Mar: UV 4. Apr: UV 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 4. Oct: UV 3. Nov: UV 2. Dec: UV 1.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 11 days. Feb: 7 days. Mar: 6 days. Apr: 3 days. May: 1 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 5 days. Dec: 9 days.
Climate Trends
Average highs have warmed by 1.3°C (2.3°F) across the available records. Average rainfall is trending drier by about 9 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jun 2025 · 26°C | Aug · 25°C |
| Coldest month | Jan 2025 · 0°C | Jan · -1°C |
| Wettest month | Aug 2025 · 160 mm | May · 134 mm |
| Windiest month | Oct 2025 · 12 km/h | Mar · 12 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October best
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 5°C / -1°C | 2°C / -4°C | 15days (107 mm) Wet | 5.2h Fair | 84% Humid | 1.6 Low | Poor | View Details |
| February | 9°C / 0°C | 6°C / -3°C | 12days (73 mm) Wet | 6.6h Fair | 79% Humid | 2.3 Moderate | Poor | View Details |
| March | 11°C / 2°C | 9°C / -1°C | 13days (78 mm) Wet | 8.4h Good | 75% Muggy | 3.7 Moderate | Poor | View Details |
| April | 15°C / 5°C | 13°C / 3°C | 13days (85 mm) Wet | 10.3h Excellent | 72% Muggy | 5.1 High | Fair | View Details |
| May | 18°C / 9°C | 17°C / 8°C | 17days (134 mm) Wet | 10.4h Excellent | 76% Humid | 5.6 High | Good | View Details |
| June best | 23°C / 14°C | 24°C / 14°C | 15days (108 mm) Wet | 11.9h Excellent | 74% Muggy | 6.7 High | Excellent | View Details |
| July best | 25°C / 16°C | 26°C / 17°C | 15days (115 mm) Wet | 12.2h Excellent | 71% Muggy | 6.6 High | Excellent | View Details |
| August best | 25°C / 16°C | 26°C / 17°C | 12days (105 mm) Wet | 11.1h Excellent | 73% Muggy | 5.8 High | Excellent | View Details |
| September best | 21°C / 13°C | 20°C / 12°C | 11days (88 mm) Wet | 9.1h Good | 78% Humid | 4.4 Moderate | Excellent | View Details |
| October best | 16°C / 8°C | 15°C / 7°C | 12days (91 mm) Wet | 7.2h Good | 82% Humid | 2.9 Moderate | Good | View Details |
| November | 10°C / 3°C | 7°C / 1°C | 14days (99 mm) Wet | 5.6h Fair | 86% Very Muggy | 1.8 Low | Poor | View Details |
| December | 6°C / 0°C | 4°C / -3°C | 14days (102 mm) Wet | 4.7h Fair | 87% Very Muggy | 1.3 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Lyss are June, July, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Lyss, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Lyss is August, with average daytime highs of 25°C (77°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Lyss is January, with average overnight lows of -1°C (30°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Lyss is May, averaging 134mm of precipitation across 17 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Lyss runs through May, January, June, July, with the heaviest rainfall in May. Based on 10-year averages for Lyss.
Lyss receives approximately 103 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Lyss.
The least favorable months to visit Lyss are January, February, November, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider June, July, August, September, October instead.
The annual average UV index in Lyss is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Lyss is 78%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Lyss receives snow. Months with snowfall average 6 snow days and 11 cm (4 in) of accumulation, with about 10 frost days during winter.
Average wind speeds in Lyss are 11 km/h (7 mph). The windiest month is March with peak winds reaching 12 km/h (8 mph) (gusts up to 35 km/h / 21 mph).
Lyss averages 2 clear-sky days per month with overall cloud cover around 66%. The clearest skies occur in March.
The annual average dew point in Lyss is 7°C (45°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Lyss has a Oceanic climate, classified as Cfb under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Lyss ranges from 6°C (43°F) to 14°C (57°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Lyss. It earns a climate score of 8.1/10 with Excellent.
For June in Lyss, pack Umbrella, Waterproof jacket, Waterproof shoes, Sunscreen (SPF 30+), Sunglasses. With average highs of 23°C (74°F) and 15 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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