My ~/.config/powerline/themes/tmux/default.json file

default.json

{
	"segments": {
		"right": [
      {
        "function": "powerline.segments.common.vcs.branch"
      },
      {
        "function": "powerline.segments.common.bat.battery"
      },
			{
				"function": "powerline.segments.common.sys.system_load",
				"priority": 50
			},
      {
        "function": "powerline.segments.common.wthr.weather"
      },
			{
				"function": "powerline.segments.common.time.date"
			},
			{
				"function": "powerline.segments.common.time.date",
				"name": "time",
				"args": {
					"format": "%H:%M",
					"istime": true
				}
			}
		],
    "left": [
      {
        "function": "powerline.segments.common.net.hostname"
      },
      {
        "function": "powerline.segments.common.net.network_load"
      },
      {
        "function": "powerline.segments.common.net.external_ip"
      }
    ]
	}
}