Long Range Weather Forecast For Ireland (29 April 2021)


TRENDS for the week of 29 April to 5 May 2021 --

-- Temperatures will average 3 to 4 deg below normal values.
-- Rainfall will average 25 to 50 per cent above normal values, heaviest around Monday and again towards end of the interval.
-- Sunshine will average only about 50 per cent of normal values -- this is generally the sunniest portion of the year in many parts of the country with 5 to 6 hours sunshine daily, but this coming week, three will be a realistic target.


TODAY will start out partly cloudy, any morning sunshine is likely to fade behind gradually spreading shower clouds, as scattered showers make their way gradually south and west, with one or two turning locally heavy with hail and thunder possible. Very cool for late April, highs only 9 to 13 C.

TONIGHT will see a return to partly cloudy and mainly dry conditions with scattered light frosts developing, lows -2 to +3 C.

FRIDAY will be almost a repeat of today with a gradual increase in cloud, scattered showers and a few thunderstorms, and cool temperatures, with light winds, the showers may not move along very fast once they develop over any given location, so some locally heavy downpours are possible. Highs 9 to 13 C.

SATURDAY will be a less unsettled but still quite cool day with light winds, some sunshine at times, isolated showers and after lows -2 to +3 C, highs near 12 C.

SUNDAY will become more cloudy during the mid-day and afternoon hours, leading to rain by late in the day. Lows near -1 C and highs near 11 C.

MONDAY looks rather dismal at this point with a well-organized low pushing in from the west, bringing some intervals of heavy rain and strong southeast winds, later turning westerly as the low tracks past central Ireland around mid-day. Rainfalls of 15-30 mm appear possible, temperatures will be held down by the cloud and rain to around 9-12 C.

OUTLOOK ... some improvements on Tuesday but staying rather cool, then another frontal boundary rainfall event around mid-week with similar outcomes to the first one (Monday), then another cycle of dry and unsettled beyond that although perhaps with warmer air slowly becoming part of the mixture of air masses. Some more average May weather conditions appear possible by the middle to end of the second week of the month.

Peter for IWO