There is a dedicated Tasker action called Weather to send weather data to your smartwatch.
Please fill all weather info to ensure weather data is complete and accepted by smartwatch.
You can use variables to fill inputs.
To send weather data to Notify app (and your smartwatch) send this intent
Action: com.mc.miband.setWeatherData (Notify for Mi Band and Notify for Amazfit apps) or com.mc.xiaomi.setWeatherData (Notify for Xiaomi app)
Extras (must be included all):
currentTemp - float - current temperature value
currentTempMin - float - minimum temperature value of current day
currentTempMax - float - maximum temperature value of current day
currentWeatherCode - integer - current weather condition code (see below)
currentWeatherDescr - string - current weather condition description (max 16 characters)
humidity - integer - today humidity
UV - integer - today UV
windSpeed - float - current wind speed
windDegrees - float - current wind degrees (0-360)
locationName - string - location name showed on watch (since 14.6.9 version)
day1.min - float - forecasted minimum temperature of +1 day
day1.max - float - forecasted maximum temperature of +1 day
day1.weatherCode - integer - forecasted weather condition code of +1 day
day1.weatherDescr - string - forecasted weather condition description of +1 day
day2.min - float - forecasted minimum temperature of +2 day
day2.max - float - forecasted maximum temperature of +2 day
day2.weatherCode - integer - forecasted weather condition code of +2 day
day2.weatherDescr - string - forecasted weather condition description of +2 day
day3.min - float - forecasted minimum temperature of +3 day
day3.max - float - forecasted maximum temperature of +3 day
day3.weatherCode - integer - forecasted weather condition code of +3 day
day3.weatherDescr - string - forecasted weather condition description of +3 day
day4.min - float - forecasted minimum temperature of +4 day
day4.max - float - forecasted maximum temperature of +4 day
day4.weatherCode - integer - forecasted weather condition code of +4 day
day4.weatherDescr - string - forecasted weather condition description of +4 day
day5.min - float - forecasted minimum temperature of +5 day
day5.max - float - forecasted maximum temperature of +5 day
day5.weatherCode - integer - forecasted weather condition code of +5 day
day5.weatherDescr - string - forecasted weather condition description of +5 day