Hellfest Weather Forecast 2026
Clisson, France
18 Jun 2026 to 21 Jun 2026
Loire Valley, a week that regularly cooks. French June sun with limited shade on the site; the combination of heat and the all-black uniform is a proven test.
Better than 60% of past years.
20-year distribution
Last 5 years
This year's figure is indicative climate data. A live forecast for the festival opens on 2026-06-18. The 20-year comparison uses weather records for this location across the event window from 2006 to 2025. Individual experience may differ from location-averaged meteorological data, and the festival itself may not have run in every year shown.
Typical conditions for this week
Climate normalsLive forecast opens from 2026-06-04.
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Post a jobPack for it
Tuned to the forecast- Reusable water bottle
- Portable charger
- Comfy trainers
- Small first-aid kit
The conditions story
Based on weather records at this location, peaks of 23°C with 0 consecutive days over 35°C drive the 9.6 score. Overnight lows of 13°C either give bodies a chance to cool off or compound the heat load.
A UV mean of 0.0 and a cooling breeze of 16 km/h are the modifiers that push the number up or down on the day. Shade access and water points usually matter more than the temperature gauge itself.
Frequently asked questions
How often is this page updated?
Current conditions refresh daily at 07:00 UTC from our cron. Forecasts cache for 6 hours; climate averages for 24 hours; the 20-year historical distribution refreshes weekly.
What does the conditions score mean for Hellfest?
A single 0-10 rating of how Hellfest's event window is shaping up, weighted toward the festival's primary risk (extreme heat and sun exposure). Above 7 means likely good, 4-6 is mixed, below 4 means prepare for the worst.
Where does the weather data come from?
Open-Meteo, an open weather API that blends multiple national weather services plus ERA5 archive data going back to 2006. The same data powers many outdoor apps.
Does the historical comparison mean the festival ran every year?
No. The 20-year comparison uses weather records for this location and event window regardless of whether the festival itself ran that year. That gives us a consistent 20-year sample even for festivals that started more recently.
What should I pack for Hellfest 2026?
See the "Pack for it" section above. The list is generated from the current forecast, tuned to the temperatures, rain probability, and primary risk you will actually face.