Long Range Weather Forecast For Ireland (10 May 2021)


TRENDS for the week of 10 to 16 May 2021 --

-- Temperatures will average about 1 deg below normal, but closer to 2 deg below during the daytime, as nights will be cloudy and therefore not overly cold.

-- Rainfalls will average 25 to 50 per cent above normal in parts of the inland south, southeast and east towards eastern Northern Ireland. Further west, especially near Atlantic coasts, rainfalls will average about the same amount below average.

-- Sunshine will be limited to brief intervals and may be challenged to reach even half of the normal amount at this sunniest time of the year normally (July is equally sunny in the southeast, by statistics, but otherwise most of Ireland enjoys its highest daily averages in May, 5.5 to 6.5 hours, but in this coming week, 2 to 3 might be closer to the outcome). Winds will continue to drop off towards lighter wind speeds in general, with a southerly to easterly component for most of the week, turning southwest by next weekend.


will be rather cloudy in general with outbreaks of light rain at first, turning heavier by afternoon around Cork and Waterford. This heavier rain with some embedded thunderstorms possible will spread gradually through the inland southeast and towards Kildare and Meath, probably avoiding the east coast with its 15-25 mm downpours. Elsewhere just spotty showers in the 2-5 mm range. Highs 12 to 16 C.

TONIGHT this rain will die off to scattered drizzle and mist, with overcast skies and lows 7 to 9 C.

TUESDAY will see a similar pattern but this time the rain is more likely to stay near the south coast and move into Wexford eventually, with areas further north seeing perhaps small amounts or locally staying dry in a few places, with variable amounts of cloud, highs 11 to 15 C.

WEDNESDAY yet another cycle of heavy showers and this one is most likely to affect the midlands into central Ulster, as the very last remnants of the spinning and decaying low pressure system head into those regions from the Atlantic south of Cork, the results could be 10-20 mm rainfalls in central counties and smaller amounts on both east and west coast. Lows 6 to 8 C and highs 11 to 15 C.

THURSDAY some of that rain may stall over Ulster and begin to loop back around in a slow southward progression, making the inland western counties perhaps the wettest part of the country, with 5-10 mm rainfalls, once again, other regions likely to be closer to dry but somewhat damp conditions under widespread cloud. Lows 5 to 7 C and highs 10 to 14 C.

FRIDAY there won't be much break between this decaying low and a resumption of travelling weather systems in a southwesterly flow, but some places could get longer dry spells and sunny breaks with a few showers in the mix, lows 4 to 7 C and highs 11 to 15 C.

SATURDAY will be showery with 10-15 mm rainfall potential and highs near 14 C.

SUNDAY will be partly cloudy with showers and highs near 15 C.

MONDAY 17th will be overcast with rain that may become rather heavy into Monday night and early Tuesday, temperatures steady around 12-15 C.

The longer term guidance, while less reliable, indicates more of these Atlantic frontal rainfalls at intervals of two or three days with another strong one shown for Thursday 20th, and more beyond that with no obvious end in sight to this new pattern of unsettled southwest flow, temperatures rather cool especially for daytime highs with all the cloud.

Peter for IWO