Hayfever sufferers are being warned about taking medication and driving as it can affect your ability to drive safely.
Many prescription and over the counter medicines can cause drowsiness or affect reaction times, coordination, concentration or vision.
Road safety charity Brake are urging driver to read the labels first.
The pollen count will increase as temperatures heat up and the worst conditions are expected on Sunday and Monday, according to forecasters.
Alexander Burkill, of the Met Office, said tree pollen would be more significant than grass pollen until the middle of May.
He said the tree pollen count will be high towards the end of the weekend, adding: "Today we've got a fair bit of cloud and the rain coming down, so it's going to go down to moderate.