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Home Assistant Jinja 2 Templates for Weather Temperatures

Step-by-step

Get the current Temperature from Home Assistant

We're casting this as a float, probably no need, but I'd rather be safe.

{% set current_temp = state_attr ('weather.home','temperature') | float %}

Get the current weather condition from Home Assistant as well

{% set current_condition = states('weather.home') %}

Fix the current Condition

When the Current weather condition is "Partly Cloudy" the default weather integration returns partlycloudy and it sounds odd when read out by a Text to Speech engine.
To fix it I added:

{% if current_condition == 'partlycloudy' %}
  {% set current_condition = 'Partly Cloudy' %}
{% endif %}

Announce the current condition and Temperature

Outside, It's {{ current_condition }} and {{ current_temp }} degrees Celsius.

Figure out the Highs and Lows from the forecast

For weather information, I want to know the High and Low temp. This data is strangely not included by default in the default weather integration, so we have to figure it out ourselves.

Start by Extracting the `forecast` array data into a variable

{% set weather = state_attr('weather.home', 'forecast') %}

Instantiate a `high_temp` and `low_temp` variable

We're assigning the temperature from the 0th record in the array to get started.

{% set high_temp = weather[0].temperature %}
{% set low_temp = weather[0].templow %}

Iterate through the array and set the `high_temp` or `low_temp` variables accordingly.

I've also added an if statement in here to announce if any of the forecast conditions are rainy and the hour that the rain is forecast for and to tell us to take an umbrella. I've surrounded that code block with ########### for clarity

{% for entry in weather %}
  {% if entry.temperature > high_temp %}
    {% set high_temp = entry.temperature %}
  {% endif %}
  {% if entry.templow < low_temp %}
    {% set low_temp = entry.templow %}
  {% endif %}

  ###########
  # While we're here, if the condition for this hour is `rainy` let's announce that
  {% if entry.condition == 'rainy'%}    
    It looks like there's rain expected at around {{ entry.datetime.split('T')[1][:2] }} o'clock. 
    You might want to take an umbrella if you're leaving the house.
  {% endif %}
  ###########

{% endfor %}

Some Qualitative statements about the `high_temp`

This code block looks at the high_temp variable and runs the if statement below to make a qualitative statement about it. These have been built for °C and I pulled the qualitative statements out of my head. Change them as you need to

Above 30°C say "It's going to be a hot one"
between 20°C and 30°C say "It should be a warm day"
between 15°C and 20°C say "It's going to be a pretty mild temperature today"
between 10°C and 15°C say "It seems like it'll be a bit chilly today"
between 0°C and 10°C say "It's going to be a cold day"
else: the high_temp variable must be < 0°C
< 0°C say "It's going to be freezing today"

{% if high_temp > 30 %}
  It's going to be a hot one
{% elif 20 < high_temp < 30 %}
  It should be a warm day
{% elif 15 < high_temp < 20 %}
  It's going to be a pretty mild temperature today
{% elif 10 < high_temp < 15 %}
  It seems like it'll be a bit chilly today
{% elif 0 < high_temp < 10 %}
  It's going to be a cold day
{% else %}
  It's going to be freezing today
{% endif %}

Announce the `high_temp` and `low_temp` values

Again, built for °C

The forecast high is {{ high_temp }} °C.
With a Low of {{ low_temp }} °C .

Some qualitative statements about the `low_temp`

Again we're looking at °C and the statements and ranges are arbitrary, and can be adjusted to your tastes

Remember these are for the low_temp variable, so it's not going to get colder than these

Above 30°C say "Wow. That's hot!"
between 20°C and 30°C say "it's not going to get below 20°C toda.y"
between 10°C and 20°C say "it might get a little bit chilly."
between 0°C and 10°C say "That's cold."
< 0°C say "Absolutely freezing!"

Puntuation like ., !, ? and , is important in the text to speech statments so the timing sounds "natural"

{% if low_temp > 30 %}
  Wow. That's hot!
{% elif 20 < low_temp < 30 %}
  it's not going to go below 20°C today.
{% elif 10 < low_temp < 20 %}
  it might get a little bit chilly.
{% elif 0 < low_temp < 10 %}
  That's cold.
{% else %}
  Absolutely freezing!
{% endif %}

Now we can put it all together:

{% set current_temp = state_attr ('weather.home','temperature') | float %}
{% set current_condition = states('weather.home') %}

{% if current_condition == 'partlycloudy' %}
  {% set current_condition = 'Partly Cloudy' %}
{% endif %}

Outside, It's {{ current_condition }} and {{ current_temp }} degrees Celsius.

{% set weather = state_attr('weather.home', 'forecast') %}
{% set high_temp = weather[0].temperature %}
{% set low_temp = weather[0].templow %}

{% for entry in weather %}
  {% if entry.temperature > high_temp %}
    {% set high_temp = entry.temperature %}
  {% endif %}
  {% if entry.templow < low_temp %}
    {% set low_temp = entry.templow %}
  {% endif %}
  {% if entry.condition == 'rainy'%}    
    It looks like there's rain expected at around {{ entry.datetime.split('T')[1][:2] }} o'clock. You might want to take an umbrella if you're leaving the house.
  {% endif %}
{% endfor %}

{% if high_temp > 30 %}
  It's going to be a hot one
{% elif 20 < high_temp < 30 %}
  It should be a warm day
{% elif 15 < high_temp < 20 %}
  It's going to be a pretty mild temperature today
{% elif 10 < high_temp < 15 %}
  It seems like it'll be a bit chilly today
{% elif 0 < high_temp < 10 %}
  It's going to be a cold day
{% else %}
  It's going to be freezing today
{% endif %}

The forecast high is {{ high_temp }} °C.

With a Low of {{ low_temp }} °C .
{% if low_temp > 30 %}
  Wow. That's hot!
{% elif 20 < low_temp < 30 %}
  it's not going to go below 20 degrees today.
{% elif 10 < low_temp < 20 %}
  it might get a little bit chilly.
{% elif 0 < low_temp < 10 %}
  That's cold.
{% else %}
  Absolutely freezing!
{% endif %}

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