The default weather data is for Los Angeles in the creator. Unfortunately no way to change during design phase. Generally there are two workarounds for this:
1) sync your draft to your watch and test live based on your current location
2) change the tag to any text string you want (use multiple string lengths like @carlosfilippa suggested) and see how it looks, then change back before publishing. I end up using this method for temps, step count testing (step count only goes to around 2400 in creator), etc.