Ayer, Switzerland experiences average highs of 10°C (50°F) and lows of 1°C (34°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 1.5°C (2.7°F) across the available records.
Ayer, Switzerland Weather & Climate 2026
Monthly climate averages for Ayer, Switzerland. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Feb–Dec 
Wetter season: Jan–Nov At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
3.8/10
Best: June, July, August, September
UV Index
5
Low
Temperature 10°C / 1°C
Feels Like 8°C / -2°C
Rainy Days 14
Rainfall 120 mm
Sunshine 9 h
Humidity 75%
Wind Speed 7 km/h
Dew Point 1°C
Snow Days 11 days
Frost Days 18 days
Hottest Month
21°C
August
Avg Low10°C
Rain13days
Coldest Month
-10°C
January
Avg High-2°C
Rain14days
Driest Month
11days
February
Avg High2°C
Avg Low-7°C
Windiest Month
8 km/h
December (Gusts 40)
Worst Time to Visit
Consider avoiding January, February, November, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:39
Daylight 15.8h
Sunset 21:24
Live conditions—
Ayer on the map · live conditions
Ayer, Switzerland
- Continent
- Europe
- Country
- Switzerland
- City
- Ayer
- Population
- 681
- Coordinates
- 46.18°, 7.60°
Seasonal Breakdown
Spring
Mar–May
Avg High 8°C
Avg Low -1°C
Rain 15 days/mo
Summer
Jun–Aug
Avg High 20°C
Avg Low 10°C
Rain 15 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 11°C
Avg Low 2°C
Rain 13 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 0°C
Avg Low -8°C
Rain 13 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: -2°C / -10°C . Feb: 2°C / -7°C . Mar: 4°C / -4°C . Apr: 8°C / 0°C . May: 11°C / 3°C . Jun: 18°C / 9°C . Jul: 21°C / 11°C . Aug: 21°C / 10°C . Sep: 16°C / 7°C . Oct: 12°C / 3°C . Nov: 4°C / -4°C . Dec: 0°C / -8°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 135 mm. Feb: 90 mm. Mar: 113 mm. Apr: 105 mm. May: 154 mm. Jun: 124 mm. Jul: 118 mm. Aug: 114 mm. Sep: 112 mm. Oct: 112 mm. Nov: 118 mm. Dec: 142 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 71%. Feb: 70%. Mar: 72%. Apr: 75%. May: 80%. Jun: 77%. Jul: 73%. Aug: 73%. Sep: 79%. Oct: 80%. Nov: 79%. Dec: 73%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 8 km/h . Feb: 7 km/h . Mar: 7 km/h . Apr: 7 km/h . May: 6 km/h . Jun: 7 km/h . Jul: 7 km/h . Aug: 7 km/h . Sep: 6 km/h . Oct: 7 km/h . Nov: 8 km/h . Dec: 8 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 9h. Apr: 11h. May: 11h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 9h. Oct: 8h. Nov: 6h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 5. Apr: UV 6. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 3. Nov: UV 2. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 18 days. Feb: 15 days. Mar: 16 days. Apr: 12 days. May: 9 days. Jun: 1 days. Jul: 0 days. Aug: 0 days. Sep: 4 days. Oct: 6 days. Nov: 14 days. Dec: 17 days.
Climate Trends
Average highs have warmed by 1.5°C (2.7°F) across the available records. Average rainfall is trending drier by about 18 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jun 2025 · 22°C | Aug · 21°C |
| Coldest month | Jan 2025 · -9°C | Jan · -10°C |
| Wettest month | Sep 2025 · 210 mm | May · 154 mm |
| Windiest month | Dec 2025 · 9 km/h | Dec · 8 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May
Wet June best
Good July best
Good August best
Excellent September best
Good October
Fair November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -2°C / -10°C | -5°C / -14°C | 14days (135 mm) Wet | 5.9h Fair | 71% Muggy | 2.1 Moderate | Poor | View Details |
| February | 2°C / -7°C | -1°C / -11°C | 11days (90 mm) Wet | 7.3h Good | 70% Muggy | 3.1 Moderate | Poor | View Details |
| March | 4°C / -4°C | 2°C / -8°C | 13days (113 mm) Wet | 9h Good | 72% Muggy | 4.6 Moderate | Poor | View Details |
| April | 8°C / 0°C | 6°C / -3°C | 12days (105 mm) Wet | 10.8h Excellent | 75% Muggy | 5.8 High | Poor | View Details |
| May | 11°C / 3°C | 11°C / 1°C | 19days (154 mm) Wet | 10.5h Excellent | 80% Humid | 6.1 High | Wet | View Details |
| June best | 18°C / 9°C | 19°C / 8°C | 17days (124 mm) Wet | 11.6h Excellent | 77% Humid | 7 High | Good | View Details |
| July best | 21°C / 11°C | 21°C / 10°C | 15days (118 mm) Wet | 12.3h Excellent | 73% Muggy | 7 High | Good | View Details |
| August best | 21°C / 10°C | 21°C / 10°C | 13days (114 mm) Wet | 11.2h Excellent | 73% Muggy | 6.3 High | Excellent | View Details |
| September best | 16°C / 7°C | 16°C / 5°C | 13days (112 mm) Wet | 9.3h Good | 79% Humid | 4.7 Moderate | Good | View Details |
| October | 12°C / 3°C | 10°C / 0°C | 12days (112 mm) Wet | 7.7h Good | 80% Humid | 3.3 Moderate | Fair | View Details |
| November | 4°C / -4°C | 2°C / -8°C | 14days (118 mm) Wet | 6.3h Fair | 79% Humid | 2.2 Moderate | Poor | View Details |
| December | 0°C / -8°C | -4°C / -12°C | 13days (142 mm) Wet | 5.3h Fair | 73% Muggy | 1.8 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Ayer are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Ayer, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Ayer is August, with average daytime highs of 21°C (69°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Ayer is January, with average overnight lows of -10°C (14°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Ayer is May, averaging 154mm of precipitation across 19 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Ayer runs through May, June, July, January, with the heaviest rainfall in May. Based on 10-year averages for Ayer.
Ayer receives approximately 107 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Ayer.
The least favorable months to visit Ayer are January, February, November, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Ayer is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Ayer is 75%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Ayer receives snow. Months with snowfall average 11 snow days and 51 cm (20 in) of accumulation, with about 18 frost days during winter.
Average wind speeds in Ayer are 7 km/h (4 mph). The windiest month is December with peak winds reaching 8 km/h (5 mph) (gusts up to 40 km/h / 25 mph).
Ayer averages 3 clear-sky days per month with overall cloud cover around 63%. The clearest skies occur in December.
The annual average dew point in Ayer is 1°C (34°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Ayer has a Warm-Summer Continental climate, classified as Dfb under the Köppen system. Continental climates experience extreme temperature ranges — hot summers and cold, snowy winters.
The 'feels like' temperature in Ayer ranges from -2°C (28°F) to 8°C (46°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Ayer. It earns a climate score of 6.5/10 with Good.
For June in Ayer, pack Warm evening layer, Umbrella, Waterproof jacket, Waterproof shoes. With average highs of 18°C (65°F) and 17 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.
Last updated: