As per the screen shot, it seems the daily minimum and maximum temperatures seem to be for the next day.
Ex. Today, it's currently 14, but the temperature range is 5-11, which seems to fit the graph for tomorrow better. And the Friday (Vendredi) shows 1-8 which seems to fit the graph temperature for Saturday better.
Happens with Open météo. Doesn't seem to have this problem with Météo France (but the forecast is less accurate in general).
LineageOS 22.3
OSS Météo 3.00.1.173 (but I've noticed it a while ago. It's not new)
Model Open-Meteo best match

As per the screen shot, it seems the daily minimum and maximum temperatures seem to be for the next day.
Ex. Today, it's currently 14, but the temperature range is 5-11, which seems to fit the graph for tomorrow better. And the Friday (Vendredi) shows 1-8 which seems to fit the graph temperature for Saturday better.
Happens with Open météo. Doesn't seem to have this problem with Météo France (but the forecast is less accurate in general).
LineageOS 22.3
OSS Météo 3.00.1.173 (but I've noticed it a while ago. It's not new)
Model Open-Meteo best match