Yahoo France made a small change to their icon source URLs, putting them on secure servers. My old script command will work, but you need to change the URL to https vs. http:
curl --silent "https://fr.meteo.yahoo.com/united-states/california/aliso-viejo-12796580/" | grep "obs-current-weather" | sed "s/.*background\:url(\'\(.*\)\') .*/\1/" | xargs curl --silent -o /tmp/weather.png
Original post here.