Here is the code, that actually works.
There was a typo at https://github.com/OpenSprinkler/OpenSprinkler-Weather/blob/master/docs/pws-protocol.md
`http://192.168.1.25:80/weatherstation/updateweatherstation.php?tempf=[th0temp-act=F.1:0]&humidity=[th0hum-act.0:–]&rainin=[rain0total-sum1=inch.2:0]&dailyrainin=[rain0total-sumday=inch.2:0]&dateutc=[UYYYY]-[UMM]-[UDD]+[Uhh]%3A[Umm]%3A[Uss]