London’s weather forecasts show the widest disagreement among 52 active city markets today, with predicted highs ranging from 22°C to 23.8°C—a 1.8°C spread. This divergence has attracted $25K in 24-hour market volume, reflecting significant trader interest in the city’s temperature outlook. For context, London’s actual high yesterday was 21°C, underscoring how current forecasts anticipate a warmer day despite recent cooler readings.
Buenos Aires commands the highest trading volume in the weather vertical, with $36K exchanged in the past 24 hours. Forecasts there predict highs between 12.4°C and 14°C, representing a 1.6°C spread. This sizable volume, coupled with a moderate forecast range, signals active market engagement in South America’s largest city.
Seoul also features prominently with $28K in 24-hour volume and a tighter forecast spread of 0.9°C, from 24.1°C to 25°C. Its lifetime market volume stands at $514.11M, indicating deep historical trading interest.
The overall weather vertical has seen $164K in volume over the last 24 hours, contributing to an all-time depth of $8.99B. London’s forecast divergence and Buenos Aires’ volume dominance illustrate the interplay between forecast uncertainty and trader activity. The spread in predictions creates opportunities for market participants to express differing views, while high volumes confirm robust liquidity across key cities.
Today’s most active weather markets
| City | Volume (24h) | Forecast high | Spread |
|---|---|---|---|
| Buenos Aires | $36K | 12.4°C–14°C | 1.6°C |
| Seoul | $28K | 24.1°C–25°C | 0.9°C |
| London | $25K | 22°C–23.8°C | 1.8°C |
Source: Polydata API v3 · /weather/cities · snapshot 2026-07-19. Data: Polydata API v3. On-chain figures are public. Realized PnL is computed over resolved markets only and excludes open positions, so it is conservative versus the Polymarket UI. This is not investment advice.