Several schools have announced they will be closed on Friday as Storm Éowyn is expected to bring severe gales.
The Met Office has issued several weather warnings, including an amber wind warning for parts of north Wales on Friday with gusts of up to 90mph (145km/h) in coastal areas.
Forecasters warned there was a danger to life, with potential power cuts and a chance buildings could be damaged.
Travel is also likely to be affected as several train operators have advised customers not to travel on routes across parts of north Wales.
All primary schools in Holyhead and many in western Anglesey announced on Thursday afternoon they will be closed on Friday due to weather risks.
Train operators Avanti West Coast, CrossCountry, and Grand Central have warned customers not to travel on routes across parts of north Wales and Scotland.
The amber warning is in place from 06:00 GMT on Friday until 21:00 and covers Anglesey, Conwy, Denbighshire, Flintshire and Gwynedd.
There are also three yellow weather warnings in place for wind and rain.
The first, for wind, is in place from 07:00 on Thursday until 17:00 and covers most of Wales.
The second for wind is in place from all of Friday and covers the whole of Wales.
The yellow warning for rain is in place from 00:00 on Friday until 09:00 and covers Blaenau Gwent, Bridgend, Caerphilly, Cardiff, Carmarthenshire, Ceredigion, Conwy, Gwynedd, Merthyr Tydfil, Monmouthshire, Neath Port Talbot, Newport, Pembrokeshire, Powys, Rhondda Cynon Taf, Swansea, Torfaen and Vale of Glamorgan.
Storm Éowyn is the fifth named storm of the 2024-25 season, which began in October last year.
“There is a chance that damage to buildings and homes could occur, with roofs blown off and power lines brought down,” a Met Office spokesman said.
“Road, rail, air and ferry services are likely to be affected, with longer journey times and cancellations possible.”
The forecaster advised people to secure loose items, such as bins and garden furniture, and gather torches and batteries in case of power cuts.