Weather forecasting maps indicate that temperatures are set to climb to 26C in certain areas of the UK in the coming days. Across England, Scotland, and Wales, up to 74 counties are expected to experience temperatures at or above 20C at the beginning of May. However, Northern Ireland is forecasted to reach only 19C.

According to the GFS weather model, temperatures will gradually increase starting on May 4, with southern and central England likely to see temperatures reaching 21C and 22C. North Wales may also experience highs of 21C in the evening.

The mercury is anticipated to continue rising throughout the week, with the south-east, particularly London, reaching 24C on May 5. Scotland could see some areas hitting 20C, while Wales may experience highs of 23C.

The peak of the warmth is expected on May 6, with temperatures reaching 26C in and around London. Other regions such as the Midlands, Yorkshire, and East Anglia could see highs of 24C or 25C. Conversely, temperatures in Northern Ireland and Scotland are predicted to be cooler.

Overall, the maps highlight that 74 counties or county boroughs may witness temperatures of 20C or higher over the three-day period, with the south-east of England experiencing the hottest conditions.

Despite the rising temperatures, this early May warm spell is unlikely to meet the criteria for an official heatwave, which requires temperatures to surpass a specific threshold for three consecutive days. The heatwave threshold varies from 25C to 28C across the UK, with the warmer south-east of England having a higher threshold of 28C compared to the northern regions.