Weather-forecast card shows precipitation for tomorrow below current temperature

[mweinelt]

Checklist

• [x] I have updated to the latest available Home Assistant version.
• [x] I have cleared the cache of my browser.
• [x] I have tried a different browser to see if it is related to my browser.

The problem

I'm currently writing a weather entity and I've run into a problem.

When

• the forecast data starts tomorrow
• and it will rain tomorrow
• and the current weather does not offer a precipitation field,
• but the forecast does, then I'll be shown the precipitation for tomorrow below the current temperature, which is somewhat misleading.

I can resolve this by including todays data in the forecast array, but then today is included in the forecast display, which makes it feel like a crude workaround.

Expected behavior

Show precipitation as seconday attribute only if data suggests it for the current day.

Steps to reproduce

This is cumbersome to reproduce, since it depends on the behaviour of the weather entity which is not well specced in that regard. I'm currently working on the bright sky integration, where I stumbled upon this.

Environment

• Home Assistant release with the issue: 0.113.0 + https://github.com/home-assistant/core/pull/37800
• Last working Home Assistant release (if known):
• Browser and browser version: Firefox 77.0.1
• Operating system: NixOS 20.09

State of relevant entities

My weather entity (including today = 2020-07-25) shows:

temperature: 24.4
humidity: 42
pressure: 1013.8
wind_bearing: 290
wind_speed: 12.2
visibility: 66.3
attribution: Deutscher Wetterdienst
forecast: 
- datetime: '2020-07-24T22:00:00+00:00'
  temperature: 27.6
  templow: 15.3
  precipitation: 0
  wind_speed: 241.8
  wind_bearing: -130
  condition: cloudy
- datetime: '2020-07-25T22:00:00+00:00'
  temperature: 25.4
  templow: 18.1
  precipitation: 4.9
  wind_speed: 391.2
  wind_bearing: -135
  condition: rainy
- datetime: '2020-07-26T22:00:00+00:00'
  temperature: 26.9
  templow: 14.6
  precipitation: 0
  wind_speed: 212.4
  wind_bearing: -151
  condition: partlycloudy
- datetime: '2020-07-27T22:00:00+00:00'
  temperature: 29.5
  templow: 17.3
  precipitation: 0
  wind_speed: 276
  wind_bearing: -138
  condition: partlycloudy
- datetime: '2020-07-28T22:00:00+00:00'
  temperature: 24.5
  templow: 18.8
  precipitation: 0
  wind_speed: 284.9
  wind_bearing: -110
  condition: cloudy
- datetime: '2020-07-29T22:00:00+00:00'
  temperature: 25.3
  templow: 15.1
  precipitation: 0
  wind_speed: 198.7
  wind_bearing: -25
  condition: partlycloudy
- datetime: '2020-07-30T22:00:00+00:00'
  temperature: 28
  templow: 15.1
  precipitation: 0
  wind_speed: 73.4
  wind_bearing: -27
  condition: partlycloudy
- datetime: '2020-07-31T22:00:00+00:00'
  temperature: 30.2
  templow: 16.8
  precipitation: 0
  wind_speed: 110.1
  wind_bearing: -46
  condition: partlycloudy
- datetime: '2020-08-01T22:00:00+00:00'
  temperature: 28.9
  templow: 19.1
  precipitation: 0
  wind_speed: 139
  wind_bearing: -108
  condition: partlycloudy
- datetime: '2020-08-02T22:00:00+00:00'
  temperature: 27
  templow: 18.4
  precipitation: 0
  wind_speed: 242.3
  wind_bearing: -131
  condition: partlycloudy

friendly_name: Bright Sky

Today is saturday, and the weather-forecast card looks like so:

If I remove the current day from the forecast it looks like this:

Note how it is not supposed to rain today (saturday) and the precipitation is still shown for what I would interpret as today.

Problem-relevant configuration

n/a

Javascript errors shown in your browser console/inspector

n/a

Additional information

[bramkragten]

The attributes only show the current condition, the min/max and precipitation are forecasts and not the current.

I would advise to add forecast data for the current day, the current values don't say much about the rest of the day.

[mweinelt]

Thanks for the advise.