Any chance of explicitly setting background color of output to dark background color? Visuals can be unreadable on light terminal themes.

One tip, in order to change colors you could alias the wttr.in command on your .bashrc or .zshrc like the following:
alias weather='curl wttr.in/YOUR_CITY | sed -e "s:226m:202m:g"'
where 226m is the yellow color code on 256 colors terminals which is changed with a more readable orange (202m).
the complete list of colors could be reached here
update:
a more comprehensive solution which I'm currently still using is:
_weather() {
tmpfile=$(mktemp)
curl -s wttr.in/$1 > $tmpfile
cat $tmpfile | sed -e 's:226m:202m:g'
rm $tmpfile
}
alias weather='_weather'
and I use this:
$ weather CITY
You can reduce it to this:
_weather() {
tmpfile=$(mktemp)
curl -s wttr.in/$1 | sed -e 's:226m:202m:g'
}
alias weather='_weather
@m0veax No, not really! What you did is what the first alias from @alex179ohm already does — pipe curl's output to sed. But, in addition, each time _weather is called you also create a wasteful temporary file (which is not used in your script and even not deleted afterwards).
I also use a light terminal theme so I created a shell script to solve this issue.
weather.sh:
#!/bin/bash
# default location
LOC="${1:-ADD_YOUR_DEFAULT_LOCATION_HERE}"
# force dark background color
esc=$'\e'
bg="$esc[48;5;232m"
eol="$esc[K"
echo -e "$bg$eol"
curl -s "http://wttr.in/$LOC" | sed "s/^/$bg$eol /;s/\[0m/\[0m$bg/g"
echo -e "$bg$eol"

The ANSI escape sequences to set a dark background could be simply sent along with the rest of the text, just like the rest of the color escapes.
@book The issue not about background color per se, the point is to preare a new color scheme, that will good work with the new background
In case anybody simply wants to remove color entirely, I do that with sed 's/\x1B[0-9\[;]\+m//g'
@C4K3 Just use ?T
wttr.in/?T
it should work. Does it work for you?
@chubin It does, awesome, I didn't know about that option.
@chubin Hi,
Sorry to ping on this, but could you make min temperature blue color just a little bit brighter, please? It's so cold here, I can barely distinguish the digits at the low end.

I'm using Konsole with slightly customized Arc Dark theme, its background color is solid #383c4a.
I've changed it to violet. I think it is better so. You know, if it is -56⁰C outside, I think blue is not blue enough for that, it should be something special

Most helpful comment
One tip, in order to change colors you could alias the wttr.in command on your .bashrc or .zshrc like the following:
where 226m is the yellow color code on 256 colors terminals which is changed with a more readable orange (202m).
the complete list of colors could be reached here
update:
a more comprehensive solution which I'm currently still using is:
and I use this: