Warm and Humid Weather Expected to Continue
Following a warm and sunny weekend across many parts of Northern Ireland, the trend of warmer and humid weather is forecast to persist throughout this week. Temperatures are anticipated to rise into the mid-20s Celsius by Tuesday, with humidity levels contributing to a warmer perceived temperature.
Despite the notable warmth, it is uncertain whether Northern Ireland will officially experience a heatwave. The criteria for a heatwave in Northern Ireland require temperatures to reach at least 25°C for three consecutive days. Current forecasts indicate that some locations may meet this threshold; however, the presence of cloud cover and weak weather fronts introduces uncertainty regarding the fulfillment of these conditions.
Heat Warnings and Conditions Elsewhere in the UK and Ireland
Meanwhile, the Met Office has extended an amber weather warning for extreme heat in other parts of the United Kingdom. Forecasts suggest that temperatures could reach as high as 38°C in some areas of England later this week.
In the Republic of Ireland, certain locations may potentially reach 30°C or higher towards the end of the week. Humidity is also expected to increase the perceived temperature in these areas. For a heatwave to be declared in the Republic of Ireland, temperatures must reach at least 25°C for five consecutive days.
Temperature Records and Forecast Details
The highest temperatures recorded so far this year include 26.3°C in Armagh, Northern Ireland, on 25 May, and 30.9°C in counties Limerick and Tipperary in the Republic of Ireland on 26 May.
In Northern Ireland, temperatures are expected to build steadily as high pressure remains close to the UK and Ireland. After a cloudy start on Monday, with some patchy rain or drizzle, conditions are expected to improve later in the day with temperatures reaching the low 20s Celsius. Thermometers are then forecast to rise to approximately 24-26°C inland on Tuesday and Wednesday.
Humidity Impact on Outdoor Activities
Thursday is predicted to be the warmest day of the week, with temperatures climbing to the mid to high 20s Celsius in areas experiencing the most prolonged sunshine. Although these temperatures are below those expected in southern Britain, humidity is likely to be a significant factor across Ireland.
Dew points are forecast to reach about 20-21°C on Thursday. Dew point is a measure of moisture in the air and serves as an indicator of how uncomfortable conditions may feel beyond temperature readings alone.
"Once dew points climb above 20°C, the air begins to feel noticeably heavy and sticky because sweat evaporates less efficiently, making it harder for the body to cool itself – especially for those working outdoors, exercising, or carrying out strenuous activity."
