check ifconfig -all and see if you actually have an IP address

ifconfig -a....gives me: 

eth0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether b8:27:eb:ce:73:d8  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 2  bytes 100 (100.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2  bytes 100 (100.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.169.194.6  netmask 255.252.0.0  broadcast 255.255.255.255
        inet6 fe80::9da1:d2dd:450f:c678  prefixlen 64  scopeid 0x20<link>
        ether b8:27:eb:9b:26:8d  txqueuelen 1000  (Ethernet)
        RX packets 2292  bytes 801120 (782.3 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1423  bytes 204514 (199.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


next do 

ps -ef|grep weewx, gives me:

pi        2593  1840  0 12:46 pts/1    00:00:00 grep --color=auto weewx


if you are using 
sudo vi /etc/weewx/weewx.conf and cannot open the file to write something more 
fundamental with your pi is going on try doing 

using the command above i can open the config file but not make any changes to 
it

ls -la /etc/weewx and see what the perms are, but sudo should allow you to open 
the file AND write it as you are root

the above command gives me:

total 88
drwxr-xr-x   9 root root  4096 Apr 28 12:40 .
drwxr-xr-x 113 root root  4096 Apr 27 16:37 ..
drwxr-xr-x   3 root root  4096 Apr  7 12:54 apache
drwxr-xr-x   2 root root  4096 Apr  9 11:53 import
drwxr-xr-x   2 root root  4096 Apr  9 11:53 logrotate.d
drwxr-xr-x   4 root root  4096 Apr  7 12:54 logwatch
drwxr-xr-x   2 root root  4096 Apr  9 11:53 rsyslog.d
drwxr-xr-x   5 root root  4096 Apr  7 12:54 skins
drwxr-xr-x   3 root root  4096 Apr  7 12:54 udev
-rw-r--r--   1 root root 14795 Apr  9 11:53 weewx.conf
-rw-r--r--   1 root root 13722 Nov 22 14:36 weewx.conf.dist
-rw-r--r--   1 root root 20480 Apr 28 12:37 .weewx.conf.swp


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