Multiple outlets report that temperatures in London are expected to rise rapidly by Friday, with a forecast jump of about 10C. The forecast suggests the capital will reach around 28C in some areas of southern England, which would mark the hottest day of the year. The change is linked to a shift to warmer conditions arriving from the south, bringing higher temperatures compared with recent days. The reports describe the increase as notable and rapid, occurring within a short period as the weather pattern changes. While specific details beyond the temperature forecast are limited in the provided excerpts, both sources focus on the same core message: a significant warming is expected in London by Friday and the day is anticipated to be the peak temperature for the year. Residents are therefore likely to see hotter-than-usual conditions, particularly in parts of the south, as the temperature tops out around the forecast level.