Hi puppycarla,
welcome to the Apple (user-to-user) Community!
Re: Weather app has changed and can’t read it without glasses! The new change has made the print so small,
and with each swipe, you get a different bright color."
Seems you may want to try to customizing your Watch after the update:
Wondering if Apple support's online article (link below) can help:
Adjust brightness, text size, sounds, and haptics on Apple Watch - Apple Support
Eg says:
"Open the Settings app
on your Apple Watch, then tap Display & Brightness to adjust the following:
- Brightness: Tap the Brightness controls to adjust, or tap the slider, then turn the Digital Crown.
- Text size: Tap Text Size, then tap the letters or turn the Digital Crown.
- Bold text: Turn on Bold Text.
You can also make these adjustments on your iPhone. Open the Apple Watch app on your iPhone,
tap My Watch, tap Display & Brightness, then adjust brightness and text.
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If you turn on Zoom, you can magnify / zoom in / zoom out again to see things on the screen larger / smaller again
see: Use Zoom on Apple Watch - Apple Support
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There are other settings that may help you, too:
Adjust text size and other visual settings on Apple Watch - Apple Support
All the best :-)