Met forecaster Sophie Yeomans said: "There is an area of warm air pushing up from the south which could give warmer weather over the bank holiday weekend".
Met Office experts say the mercury should gradually creep up from today, as the rain eases off following last weekend's washout.
"Temperatures rising slightly above by Friday, leading to a pleasant Bank Holiday weekend as temperatures lift into the low, possibly mid-20s C, in gently south-westerly winds".
After what is expected to be a fairly cloudy start on Saturday, bright spells will develop mid-morning right through until the evening.
Temperatures will be even higher over the weekend, with highs of 19 degrees forecast in some parts of the county.
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"We won't see the temperatures we saw earlier in April, but it will still be on the warmer side".
Bank holiday Monday on May 5 will have a "good deal of sunshine", a welcome break from the recent downpour of rain.
Some areas are likely to be cooler and cloudier, however, particularly along the east coast.
As the sunshine returns, temperatures are expected to rise to up to 25 degrees in certain parts of the week later.
High pressure should remain in charge on Tuesday, according to computer models, although there could be the occasional shower and drizzle in north-western Scotland.