Temperatures will plunge to as low as -2C in some parts of Wales over the bank holiday weekend.
The May Day bank holiday is often associated with the first barbecue of the year but only the hardiest will be braving the shorts this weekend.
According to the Met Office there is potential for some temperatures feeling like -3C due to the wind chill.
The reason for the cold temperatures is due to an arctic wind coming from the north which will bring the chilly air southwards.
Where will it be coldest?
A Met Office Meteorologist said the Valleys are going to see the lowest temperatures in Wales over the bank holiday weekend.
She said: "As cold air is denser we are most likely to see the coldest temperatures in the Valleys as it stays in the valley bottoms as opposed to hill tops.
"There is likely to be frost overnight in some palces.
"I think we will see air temperatures getting down to -1C on Saturday morning and maybe as low as -2C on Sunday morning."
How about other places in Wales?
According to WeatherCast this is how cold the following places will get over bank holiday weekend:
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Cardiff 3C
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Swansea 4C
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Newport 1C
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Merthyr Tydfil 1C
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Bangor 3C
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Brecon 1C
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Aberystwyth 2C
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Pembroke 4C
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Carmarthan 4C
Met Office bank holiday weather forecast shows very cold weather as Arctic air heads for UK in May!
Will it be too cold to spend time outdoors?
According to the Met Office there are still options this weekend if you want to spend time outdoors.
"There is high pressure so it should be sunny," said the Met Office meteriologist.
"If you can shelter from the wind it won't feel bad at all especially on Sunday."
