Trader consensus on Polymarket strongly favors under 20 mm total April precipitation in London at 65.6% implied probability, driven by exceptionally dry conditions through April 15, with just 1.4 mm accumulated at the NW3 London station—only 3% of the long-term monthly average of around 44 mm. After a wet winter, high pressure has dominated early spring, delivering mostly dry, bright spells punctuated by minor traces on just three days, as confirmed by Met Office observational data and recent summaries noting scant rainfall in southeast England during the first week. Ensemble forecasts from the Met Office indicate low precipitation risk for the remaining fortnight, though isolated showers could add minor totals; watch for updates around April 20-25 as model runs refine end-of-month outlooks.