Across Ll?n there are many ways in
which you are supposed to be able to tell what weather is
coming. Here are just a few examples:
If you can see Pembrokeshire to the south, it is likely to
rain (there is a lump on the horizon known on Ll?n as "the
little rain mountain" and if you can see this it is a sign
of rain coming).
Also, if you can see the sun reflecting off the windows of
the cafe on the summit of Snowdon or if you can see Holyhead
or Ireland clearly, that is supposed to be another sign of
rain.
Dry sand blowing across the beach at Llanbedrog is also said
to indicate rain for the following day.
These are just a few taken from "Ll?n" a fascinating book by
Elfed Gruffydd, translated into English by Gwyneth Owen:
"Cloud cover on Garn Fadryn - better weather will follow"
"The bell on the rocks of Carreg-y-Trai near St. Tudwal's
Islands can be heard from Cilan in fair weather" (however
the bell has now been removed!)
"If a ship shelters in Nefyn Bay, the following storm will
last two or three days"

Double rainbow over the Warren Beach.