How to truncate the list as soon as the date changes and remove the previous entries?

Question

Python

I get weather data from openweathermap, the length of the list is constantly changing depending on the time the service is accessed. You need to leave only three days, and remove the first and last. I'm using a free subscription
I'm a complete newbie to python, please help me

try:  
    res = requests.get("http://api.openweathermap.org/data/2.5/forecast",params={'id': city_id, 'units': 'metric','lang': 'ru', 'APPID': appid})
    data = res.json()
    forecastlist=[]
    for i in data['list']:
        forecast=i['dt_txt'],'{0:+3.0f}'.format(i['main']['temp']),i['main']['pressure'],i['main']['humidity'],i['wind']['speed']
        forecastlist.append(forecast)
    weather = np.array(forecastlist).reshape(-1, 5)