About Grandfontaine
Grandfontaine is a Swiss municipality located in the canton of Jura (JU), at 47.393° latitude and 6.932° longitude. The municipality is part of the Jura massif, continental climate, cold winters and moderate summers. Also known as Grandfontaine, Grandfontaine benefits from precise weather monitoring with hourly and 15-day forecasts.
Climate of Grandfontaine
The climate in Grandfontaine is characteristic of the Jura massif, continental climate, cold winters and moderate 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 Grandfontaine and neighboring municipalities.
On this page you will find the detailed weather forecast for Grandfontaine: current temperature, 48-hour hourly forecast, 15-day forecast, air quality, UV index, wind, precipitation and weather alerts. Updated hourly.
Climate of Grandfontaine: 1991–2020 normals
In Grandfontaine (571 m), the mean annual temperature is 9.6 °C. The warmest month is July (18.3 °C on average) and the coldest January (1.4 °C). About 1037 mm of precipitation falls per year, peaking in May (106 mm) with a minimum in February (64 mm). The sun shines for about 1697 hours a year, mostly in July (236 h). On average there are 78 frost days and 6 hot days (≥ 30 °C) per year. The mean monthly maximum reaches 31.3 °C and the absolute minimum −9.9 °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 | 1.4 °C | 12.5 °C | −9.9 °C | 66 | 63 | 19 | 0 |
| Feb | 2.0 °C | 13.8 °C | −8.5 °C | 64 | 85 | 16 | 0 |
| Mar | 5.5 °C | 18.2 °C | −5.0 °C | 68 | 133 | 11 | 0 |
| Apr | 9.0 °C | 22.0 °C | −1.8 °C | 77 | 167 | 4 | 0 |
| May | 12.7 °C | 25.5 °C | 2.1 °C | 106 | 186 | 0 | 2 |
| Jun | 16.3 °C | 29.1 °C | 6.0 °C | 98 | 213 | 0 | 7 |
| Jul | 18.3 °C | 31.3 °C | 8.5 °C | 92 | 236 | 0 | 12 |
| Aug | 18.1 °C | 30.8 °C | 8.0 °C | 102 | 221 | 0 | 11 |
| Sep | 14.0 °C | 25.6 °C | 4.8 °C | 88 | 158 | 0 | 2 |
| Oct | 10.0 °C | 22.0 °C | 0.1 °C | 98 | 113 | 1 | 0 |
| Nov | 5.2 °C | 16.7 °C | −4.2 °C | 89 | 67 | 9 | 0 |
| Dec | 2.3 °C | 12.9 °C | −8.2 °C | 89 | 55 | 17 | 0 |
| Year | 9.6 °C | 31.3 °C | −9.9 °C | 1037 | 1697 | 78 | 34 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Fahy (4 km, 596 m), Chasseral (30 km, 1594 m), Delémont (32 km, 439 m), adjusted to the elevation of Grandfontaine (571 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Nearby cities
Check the weather of cities near Grandfontaine:
- Weather Fahy
- Weather Haute-Ajoie
- Weather Bure
- Weather Courtedoux
- Weather Courchavon
- Weather Basse-Allaine
- Weather Porrentruy
- Weather Fontenais
- Weather Boncourt
- Weather Soubey
- Weather Les Enfers
- Weather Coeuve
Frequently asked questions about weather in Grandfontaine
What is the weather in Grandfontaine today?
At the top of the page you will find the current temperature, precipitation and wind in Grandfontaine, updated in real time.
What is the 15-day forecast for Grandfontaine?
The "15-day forecast" section shows min/max temperatures, precipitation and wind expected for the next 15 days in Grandfontaine.
Will it rain tomorrow in Grandfontaine?
Check the 48-hour hourly forecast to see exactly when precipitation is expected in Grandfontaine.
What is the air quality in Grandfontaine?
The air quality section displays the AQI index and PM2.5, PM10 and ozone concentrations measured near Grandfontaine.
Are there weather alerts for Grandfontaine?
Weather alerts (storms, high winds, extreme temperatures) are shown as a banner at the top of the page when active.
At what altitude is Grandfontaine located?
Grandfontaine sits at around 571 m above sea level in the canton of Jura. This elevation directly affects the temperatures, rain-snow line and snow cover shown in the forecasts.
What is the warmest month in Grandfontaine?
The warmest month in Grandfontaine is July, averaging 18.3 °C (1991–2020 normal). The coldest is January at 1.4 °C.
How much does it rain in Grandfontaine per year?
Grandfontaine receives about 1037 mm of precipitation a year. The wettest month is May (106 mm), the driest February (64 mm).
When is the best time to visit Grandfontaine?
For warmth and sunshine: July (18.3 °C on average, 236 h of sun). The coldest month is January (1.4 °C). Check the 15-day forecast above for your dates.