Must be a client-side issue, things look fine on the server:

https://www.google.com/coac?q=weather

Seems like CL 1269622 is the most recent and fairly significant change to that area of the code. Ken, could you take a look? Thanks!

The weather cards were 100% working well after that change landed, so it's not going to be that change that's the problem. +dmblack in case he has ideas.

Sorry I'm realizing this is app list UI not assistant UI, so maybe dmblack won't have ideas. :)

But it could be a general problem related to answer cards, which assistant also loads with content service.

Also, that URL (in comment #4) does not look fine to me. I get empty content.

Fairly sure this is a server-side issue.

Also not able to see the weather card at the link in comment #4.

Interestingly, "what time is it" seems to be WAI and I think that is served from the same coac endpoint as above so agree that it feels server side (and maybe even specific only to weather).

Interesting. I do get an answer card with this URL:

    https://www.google.com/coac?q=weather

Maybe it depends on your location. Can someone who sees an empty page look at the HTTP response? The server sets a custom header "searchanswer-hasresult". If that's true, we show the card. If that's false the server deemed it had nothing meaningful to show us, and the client should not show a card.

Might also be interesting to include the location, as in:

    https://www.google.com/coac?q=weather+new+york+city

I get empty content with just q=weather. It comes back with SearchAnswer-HasResult as false. If I add more context like q=weather+nyc, I get a card.

Actually, oddly enough... if I try q=weather+SF or q=weather+san+francisco, I also get no card response.

Hmm, that's very strange. Indeed I also get nothing with:

    https://www.google.com/coac?q=weather+san+francisco

This might be something transient... All other random locations that I try do return something.

I put up a simple page here to test some sample queries, in case that helps:

    http://ma.nu/coac

Tried some more cities, the weather is shown for everywhere except for cities within California :-D Very strange!

Thought the same thing, but I found a few other examples outside of CA too. Salt Lake City and Carson City, for example.

Also several cities in California are still fine, like San Diego or... Eureka. :p

This is getting weirder and weirder!

San Francisco now has a weather card (so does San Jose, and so does Cupertino), but Salt Lake City still doesn't.

It's clear that this is a server issue, and probably not an issue with the server code that we own within GWS. Definitely very strange. Reassigning to myself, though I might end up closing this and following up with GWS people because I don't think much can be done at the Chrome OS level.