Max temp of given day

{% set now_date = ((now() + timedelta(days=0)) | string)[0:10] %}
{% set forecast = state_attr("weather.dom_hourly", "forecast") %}
{% set ns = namespace(max_temp=-1000) %}
{%- for f in forecast -%}
{%- if f["datetime"][0:10] == now_date %}
{% set ns.max_temp = [f["temperature"], ns.max_temp] | max %}
{%- endif -%}
{%- endfor -%}
{{ ns.max_temp }}