Below is the forecast on the Met site for late March.
UK Outlook for Thursday 13 Mar 2014 to Thursday 27 Mar 2014:
Current indications suggest fairly typical weather conditions for the time of year will continue during the latter half of March. This will mean spells of wet and windy weather, most likely in the north and west, but still some decent sunny spells in between. The best of the drier, brighter conditions are likely to be in the south and east of the UK. Temperatures most likely to be around to slightly above average for late March, with a risk of overnight frosts and icy patches, mainly in the settled periods.
"Temperatures most likely to be around to slightly above average for late March, with a risk of overnight frosts and icy patches" should cover all the bases Current indications suggest fairly typical weather conditions for the time of year will continue during the latter half of March. This will mean spells of wet and windy weather, most likely in the north and west, but still some decent sunny spells in between. The best of the drier, brighter conditions are likely to be in the south and east of the UK. Temperatures most likely to be around to slightly above average for late March, with a risk of overnight frosts and icy patches, mainly in the settled periods.