Not sure what the state of play is today (Friday) but all the current forecasts being put out by the likes of Meteo France for the Paris area (and indeed France in general) have been consistent for a while in predicting a major warming up over the next day or two and temperatures up at around 10 Celsius by Monday.
have tried searching and looking on the www but I am not finding it easy to get this information. Thank you.
As far as weather forecasts are concerned this far out there’s no advantage to trying to find an aviation weather source, I’d just look at the meteofrance or the BBC weather websites.