Please read this topic, especially point 11 regarding the correct formatting of code in the forum.
You can use a value_template to round your value.
Try this:
sensor:
- platform: mqtt
name: “OutTemperature1”
state_topic: “weather/outTemp_C”
unit_of_measurement: ‘°C’
value_template: "{{ (value | round(2)) | float }}"
I’m not sure if the last float filter is needed, you can probably remove it, can’t test at the moment.