Monthly forecasts can at times provide an insight into weather patterns in the month ahead. However, they should not be used for specific planning purposes as they have generally low skill compared with the 10-day forecast. This is because forecasts beyond one week become increasingly uncertain due to the chaotic nature of the atmosphere. Monthly forecast explained.
MONTHLY FORECAST, ISSUED Friday 09 APRIL 2021
Week 1 (Monday 12 April to Sunday 18 April)
A changeable weather pattern is forecast during this week with cold and showery weather giving way to more mixed conditions during the week with less cold temperatures. A very cold start to the week but temperatures are expected to rise to more normal values later on. Overall, mean air temperatures are expected to be below average with some frosty nights possible early in the week. Rainfall amounts are forecast be near or above average for April with some rain-bands and showers moving through at times.
Week 2 (Monday 19 April to Sunday 25 April)
There are no strong signals for particular weather regimes at forecast week 2 indicating a mixed and changeable week of weather for Ireland. It is expected to be milder than preceding weeks with mean air temperatures forecast to be close to the April average or perhaps just slightly below average. Rainfall amounts are predicted to be near or below average.
Week 3 (Monday 26 April to Sunday 02 May)
By forecast week 3, confidence is low but there are signs of a continuation of the changeable weather with mixed, often showery weather. Mean air temperatures are predicted to be close to average whilst rainfall amounts will also be near the seasonal norm.
Week 4 (Monday 03 May to Sunday 09 May)
Towards early May there are signals low pressure may be more dominant than normal bringing a risk of showery weather. Rainfall totals are forecast to be slightly above normal, whilst mean air temperatures are predicted to be a little warmer than average for May.