Recent wet conditions across southeast England, with measurable rainfall on most days through mid-May, have positioned the total near 20-25 mm so far and kept the 15-20 mm and 25-30 mm bands nearly tied. Forecasters track the position of the North Atlantic jet stream and frequency of Atlantic low-pressure systems, which continue to deliver frontal rain and showers. Model guidance shows moderate uncertainty for the second half of the month: a more zonal flow would favor additional 15-20 mm, while any high-pressure development could limit totals closer to the lower band. Typical May climatology for London averages 45-50 mm, so outcomes hinge on whether current unsettled patterns persist or ease.