About Cossonay
Cossonay is a Swiss municipality located in the canton of Vaud (VD), at 46.616° latitude and 6.502° longitude. The municipality is part of the Lake Geneva region, temperate climate with lake influence, mild winters and warm summers. Also known as Cossonay, Cossonay benefits from precise weather monitoring with hourly and 15-day forecasts.
Climate of Cossonay
The climate in Cossonay is characteristic of the Lake Geneva region, temperate climate with lake influence, mild winters and warm summers. Temperatures, precipitation and wind conditions vary throughout the year with local features linked to altitude and surrounding terrain. Our data comes from official weather stations and real-time Netatmo sensors for Cossonay and neighboring municipalities.
On this page you will find the detailed weather forecast for Cossonay: current temperature, 48-hour hourly forecast, 15-day forecast, air quality, UV index, wind, precipitation and weather alerts. Updated hourly.
Climate of Cossonay: 1991–2020 normals
In Cossonay (581 m), the mean annual temperature is 9.8 °C. The warmest month is July (19.0 °C on average) and the coldest January (1.5 °C). About 977 mm of precipitation falls per year, peaking in August (98 mm) with a minimum in February (56 mm). The sun shines for about 1909 hours a year, mostly in July (254 h). On average there are 68 frost days and 12 hot days (≥ 30 °C) per year. The mean monthly maximum reaches 31.3 °C and the absolute minimum −8.1 °C.
Mean monthly precipitation (mm) — bar height relative to the wettest month.
| Month | Mean T | Abs. max | Abs. min | Precip. (mm) | Sunshine (h) | Frost days | Summer days |
|---|---|---|---|---|---|---|---|
| Jan | 1.5 °C | 10.8 °C | −8.1 °C | 68 | 72 | 16 | 0 |
| Feb | 2.0 °C | 12.7 °C | −7.9 °C | 56 | 100 | 15 | 0 |
| Mar | 5.5 °C | 17.6 °C | −4.9 °C | 58 | 163 | 10 | 0 |
| Apr | 9.1 °C | 21.9 °C | −1.9 °C | 69 | 187 | 3 | 0 |
| May | 13.3 °C | 26.3 °C | 2.5 °C | 94 | 200 | 0 | 4 |
| Jun | 17.0 °C | 29.7 °C | 6.1 °C | 96 | 236 | 0 | 12 |
| Jul | 19.0 °C | 31.3 °C | 8.3 °C | 89 | 254 | 0 | 18 |
| Aug | 18.4 °C | 30.3 °C | 7.6 °C | 98 | 238 | 0 | 16 |
| Sep | 14.3 °C | 25.0 °C | 4.0 °C | 84 | 199 | 0 | 3 |
| Oct | 10.1 °C | 20.6 °C | 0.4 °C | 95 | 132 | 1 | 0 |
| Nov | 5.3 °C | 15.3 °C | −4.0 °C | 80 | 79 | 7 | 0 |
| Dec | 2.2 °C | 11.4 °C | −7.2 °C | 87 | 49 | 14 | 0 |
| Year | 9.8 °C | 31.3 °C | −8.1 °C | 977 | 1909 | 68 | 53 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Mathod (14 km, 435 m), Pully (17 km, 456 m), Bullet / La Frétaz (26 km, 1205 m), adjusted to the elevation of Cossonay (581 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Nearby cities
Check the weather of cities near Cossonay:
- Weather Dizy
- Weather Penthalaz
- Weather Senarclens
- Weather Lussery-Villars
- Weather Gollion
- Weather La Chaux (Cossonay)
- Weather Penthaz
- Weather Chevilly
- Weather La Sarraz
- Weather Daillens
- Weather Grancy
- Weather Chavannes-le-Veyron
Frequently asked questions about weather in Cossonay
What is the weather in Cossonay today?
At the top of the page you will find the current temperature, precipitation and wind in Cossonay, updated in real time.
What is the 15-day forecast for Cossonay?
The "15-day forecast" section shows min/max temperatures, precipitation and wind expected for the next 15 days in Cossonay.
Will it rain tomorrow in Cossonay?
Check the 48-hour hourly forecast to see exactly when precipitation is expected in Cossonay.
What is the air quality in Cossonay?
The air quality section displays the AQI index and PM2.5, PM10 and ozone concentrations measured near Cossonay.
Are there weather alerts for Cossonay?
Weather alerts (storms, high winds, extreme temperatures) are shown as a banner at the top of the page when active.
At what altitude is Cossonay located?
Cossonay sits at around 581 m above sea level in the canton of Vaud. This elevation directly affects the temperatures, rain-snow line and snow cover shown in the forecasts.
What is the warmest month in Cossonay?
The warmest month in Cossonay is July, averaging 19.0 °C (1991–2020 normal). The coldest is January at 1.5 °C.
How much does it rain in Cossonay per year?
Cossonay receives about 977 mm of precipitation a year. The wettest month is August (98 mm), the driest February (56 mm).
When is the best time to visit Cossonay?
For warmth and sunshine: July (19.0 °C on average, 254 h of sun). The coldest month is January (1.5 °C). Check the 15-day forecast above for your dates.