Qui si cominciano a fermare le mie competenze... sembrano esserci degli errori credo di configurazione, o in weewx.conf o nel file di configurazione del template skin.conf, però per capirne la causa andrebbe fatta un'analisi un po' più approfondita...cosa non molto semplice a distanza.
Il consiglio che posso darti è di stoppare weewx, riavviarlo, ed analizzare bene il file LOG per capire passo passo i vari errori, partendo dal primo a scendere.
Jun 30 15:17:11 raspberrypi systemd[1]: Started User Manager for UID 1000.
Jun 30 15:17:14 raspberrypi dbus[406]: [system] Activating via systemd: service name='org.freedesktop.UDisks2' unit='udisks2.service'
Jun 30 15:17:14 raspberrypi systemd[1]: Starting Disk Manager...
Jun 30 15:17:14 raspberrypi udisksd[895]: udisks daemon version 2.1.3 starting
Jun 30 15:17:15 raspberrypi dbus[406]: [system] Successfully activated service 'org.freedesktop.UDisks2'
Jun 30 15:17:15 raspberrypi udisksd[895]: Acquired the name org.freedesktop.UDisks2 on the system message bus
Jun 30 15:17:15 raspberrypi systemd[1]: Started Disk Manager.
Jun 30 15:17:15 raspberrypi org.gtk.Private.AfcVolumeMonitor[846]: Volume monitor alive
Jun 30 15:17:16 raspberrypi dhcpcd[432]: eth0: leased 192.168.188.20 for 864000 seconds
Jun 30 15:17:16 raspberrypi avahi-daemon[395]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.188.20.
Jun 30 15:17:16 raspberrypi dhcpcd[432]: eth0: adding route to 192.168.188.0/24
Jun 30 15:17:16 raspberrypi avahi-daemon[395]: New relevant interface eth0.IPv4 for mDNS.
Jun 30 15:17:16 raspberrypi avahi-daemon[395]: Registering new address record for 192.168.188.20 on eth0.IPv4.
Jun 30 15:17:16 raspberrypi dhcpcd[432]: eth0: adding default route via 192.168.188.1
Jun 30 15:17:17 raspberrypi systemd[1]: Stopping LSB: Start NTP daemon...
Jun 30 15:17:17 raspberrypi ntpd[612]: ntpd exiting on signal 15
Jun 30 15:17:17 raspberrypi ntp[1039]: Stopping NTP server: ntpd.
Jun 30 15:17:17 raspberrypi systemd[1]: Starting LSB: Start NTP daemon...
Jun 30 15:17:17 raspberrypi ntpd[1056]: ntpd 4.2.6p5@1.2349-o Mon Jul 25 22:35:28 UTC 2016 (1)
Jun 30 15:17:17 raspberrypi ntp[1049]: Starting NTP server: ntpd.
Jun 30 15:17:17 raspberrypi ntpd[1057]: proto: precision = 1.354 usec
Jun 30 15:17:17 raspberrypi ntpd[1057]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
Jun 30 15:17:17 raspberrypi systemd[1]: Started LSB: Start NTP daemon.
Jun 30 15:17:17 raspberrypi ntpd[1057]: Listen and drop on 1 v6wildcard :: UDP 123
Jun 30 15:17:17 raspberrypi ntpd[1057]: Listen normally on 2 lo 127.0.0.1 UDP 123
Jun 30 15:17:17 raspberrypi ntpd[1057]: Listen normally on 3 eth0 192.168.188.20 UDP 123
Jun 30 15:17:17 raspberrypi ntpd[1057]: Listen normally on 4 lo ::1 UDP 123
Jun 30 15:17:17 raspberrypi ntpd[1057]: Listen normally on 5 eth0 fe80::2c99:87b0:1c66:6d52 UDP 123
Jun 30 15:17:17 raspberrypi ntpd[1057]: peers refreshed
Jun 30 15:17:17 raspberrypi ntpd[1057]: Listening on routing socket on fd #22 for interface updates
Jun 30 15:17:19 raspberrypi dhcpcd[432]: eth0: no IPv6 Routers available
Jun 30 15:20:12 raspberrypi systemd[798]: Time has been changed
Jun 30 15:20:12 raspberrypi systemd[1]: Time has been changed
Jun 30 15:20:20 raspberrypi ntpd_intres[618]: parent died before we finished, exiting
Jun 30 15:20:41 raspberrypi CRON[1082]: (pi) CMD (sudo sh /var/www/html/./scatto2.sh)
Jun 30 15:20:41 raspberrypi CRON[1084]: (pi) CMD (sudo python /var/www/html/./tempyo1.py)
Jun 30 15:20:41 raspberrypi CRON[1086]: (weewx) CMD (/usr/local/bin/realtime.sh)
Jun 30 15:20:41 raspberrypi CRON[1070]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:20:41 raspberrypi CRON[1109]: (weewx) CMD (/usr/local/bin/realtime.sh)
Jun 30 15:20:41 raspberrypi CRON[1111]: (pi) CMD (sudo python /var/www/html/./canon.py)
Jun 30 15:20:41 raspberrypi CRON[1096]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:20:41 raspberrypi CRON[1132]: (pi) CMD (sudo sh /var/www/html/./scatto2.sh)
Jun 30 15:20:41 raspberrypi CRON[1131]: (pi) CMD (sudo python /var/www/html/./tempyo1.py)
Jun 30 15:20:41 raspberrypi CRON[1135]: (weewx) CMD (/usr/local/bin/realtime.sh)
Jun 30 15:20:41 raspberrypi CRON[1116]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:20:43 raspberrypi CRON[1072]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:20:43 raspberrypi CRON[1118]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:20:45 raspberrypi CRON[1071]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:20:45 raspberrypi rsyslogd-2007: action 'action 17' suspended, next retry is Sat Jun 30 15:21:15 2018 [try
http://www.rsyslog.com/e/2007 ]
Jun 30 15:20:45 raspberrypi CRON[1117]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:21:01 raspberrypi CRON[1097]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:21:01 raspberrypi CRON[1297]: (weewx) CMD (/usr/local/bin/realtime.sh)
Jun 30 15:21:01 raspberrypi CRON[1296]: (pi) CMD (sudo python /var/www/html/./canon.py)
Jun 30 15:21:01 raspberrypi CRON[1288]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:21:15 raspberrypi rsyslogd-2007: action 'action 17' suspended, next retry is Sat Jun 30 15:21:45 2018 [try
http://www.rsyslog.com/e/2007 ]
Jun 30 15:21:18 raspberrypi CRON[1289]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:21:40 raspberrypi systemd[1]: Starting user-1001.slice.
Jun 30 15:21:40 raspberrypi systemd[1]: Created slice user-1001.slice.
Jun 30 15:21:40 raspberrypi systemd[1]: Starting User Manager for UID 1001...
Jun 30 15:21:40 raspberrypi systemd[1]: Starting Session c3 of user weewx.
Jun 30 15:21:41 raspberrypi systemd[1]: Started Session c3 of user weewx.
Jun 30 15:21:41 raspberrypi systemd[1360]: Starting Paths.
Jun 30 15:21:41 raspberrypi systemd[1360]: Reached target Paths.
Jun 30 15:21:41 raspberrypi systemd[1360]: Starting Timers.
Jun 30 15:21:41 raspberrypi systemd[1360]: Reached target Timers.
Jun 30 15:21:41 raspberrypi systemd[1360]: Starting Sockets.
Jun 30 15:21:41 raspberrypi systemd[1360]: Reached target Sockets.
Jun 30 15:21:41 raspberrypi systemd[1360]: Starting Basic System.
Jun 30 15:21:41 raspberrypi systemd[1360]: Reached target Basic System.
Jun 30 15:21:41 raspberrypi systemd[1360]: Starting Default.
Jun 30 15:21:41 raspberrypi systemd[1360]: Reached target Default.
Jun 30 15:21:41 raspberrypi systemd[1360]: Startup finished in 32ms.
Jun 30 15:21:41 raspberrypi systemd[1]: Started User Manager for UID 1001.
Jun 30 15:22:01 raspberrypi rsyslogd-2007: action 'action 17' suspended, next retry is Sat Jun 30 15:22:31 2018 [try
http://www.rsyslog.com/e/2007 ]
Jun 30 15:22:01 raspberrypi CRON[1395]: (pi) CMD (sudo python /var/www/html/./tempyo1.py)
Jun 30 15:22:01 raspberrypi CRON[1396]: (weewx) CMD (/usr/local/bin/realtime.sh)
Jun 30 15:22:01 raspberrypi CRON[1384]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:22:01 raspberrypi CRON[1401]: (pi) CMD (sudo sh /var/www/html/./scatto2.sh)
Jun 30 15:22:02 raspberrypi CRON[1386]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:22:04 raspberrypi CRON[1385]: (CRON) info (No MTA installed, discarding output)
Jun 30 15:22:04 raspberrypi systemd[1]: Starting Session c4 of user pi.
Jun 30 15:22:04 raspberrypi systemd[1]: Started Session c4 of user pi.
Jun 30 15:22:51 raspberrypi rsyslogd-2007: action 'action 17' suspended, next retry is Sat Jun 30 15:23:21 2018 [try
http://www.rsyslog.com/e/2007 ]
Jun 30 15:22:51 raspberrypi systemd[1]: Starting Session c5 of user pi.
Jun 30 15:22:51 raspberrypi systemd[1]: Started Session c5 of user pi.