The issue seems to be coming from get-UV-forecast-inc.php which has the following results:
<!-- get-UV-forecast-inc.php V1.09 - 12-Feb-2021 -->
<!-- UV forecast courtesy of and Copyright © KNMI/ESA (http://www.temis.nl/). Used with permission. -->
<!-- curl fetching 'https://www.temis.nl/uvradiation/nrt/uvindex.php?lon=-122.0227&lat=37.2715' -->
<!-- curl Error: SSL: no alternative certificate subject name matches target host name 'www.temis.nl' -->
<!-- HTTP stats: RC=0 dest=52.213.179.56 port=443 (from sce=198.46.81.47)
Times: dns=0.001 conn=4.591 pxfer=0.000 get=4.791 total=4.791 secs -->
<!-- headers returned:
-->
<!-- UV data load from from URL https://www.temis.nl/uvradiation/nrt/uvindex.php?lon=-122.0227&lat=37.2715 -->
<!-- data not available -->
That script fills in the $UVfcstUVI array, and since your website server can't connect to
www.temis.nl using HTTPS, the array has no entries (thus the Notice: errata). You are running the current script version. The script is working fine on my (and other sites), so I suspect something amiss in the server configuration of your website server (no something you can normally change).
Running check-fetch-times.php?show=info on your site shows:
Current required cURL features status:
cURL version: 7.77.0
cURL SSL version: OpenSSL/1.1.1l
cURL libz version: 1.2.7
SSL is available
LIBZ is available
cURL protocols supported: dict, file, ftp, ftps, gopher, gophers, http, https, imap, imaps, mqtt, pop3, pop3s, rtsp, scp, sftp, smb, smbs, smtp, smtps, telnet, tftp
For reference, my site shows
Current required cURL features status:
cURL version: 7.29.0
cURL SSL version: NSS/3.53.1
cURL libz version: 1.2.7
SSL is available
LIBZ is available
cURL protocols supported: dict, file, ftp, ftps, gopher, http, https, imap, imaps, ldap, ldaps, pop3, pop3s, rtsp, scp, sftp, smtp, smtps, telnet, tftp
but I'm running CentOS7, not Ubuntu on my server.
Running check-fetch-times.php on your site shows the same error, but does show success for
https://alerts.weather.gov/cap/wwaatmget.php?x=ALZ008 so https is working to external sites.
I think you should call tech support for your hoster, and ask them to flush the SSL certificate cache for
www.temis.nl .. maybe that will resolve this issue.