London May 6 Low Temp: Will Nine Degrees Hold?

London’s overnight low on May 6 is a 40-percent proposition right now, and the market has been moving fast. The 9°C outcome gained 8.5 percent in 24 hours heading into May 5. That kind of single-day repricing on a short-horizon weather contract signals traders reacting to fresh forecast data, not noise.

The contract resolves at noon UTC on May 6, 2026. Ten possible temperature brackets are on the table. The 9°C bracket currently leads the field at 40 percent implied probability, with the 60 percent NO price reflecting the spread across nine competing outcomes. This is a multi-outcome market structured as a YES/NO on one bracket, which means NO carries a lot of combinations.

How the Nine Degrees Celsius Contract Works

The contract pays YES if the official lowest temperature recorded in London on May 6, 2026 falls in the 9°C bracket. Resolution follows the designated weather data source for this Polymarket contract, typically a major meteorological service reporting London surface temperature. The market closes at 2026-05-06 12:00:00 UTC.

• YES (9°C lowest temp): 0.40 implied probability, $0.40 current price
• NO (any other bracket): 0.60 implied probability, $0.60 current price

The NO side wins across nine alternative brackets: 8°C, 10°C, 7°C, 6°C, 11°C, 13°C or higher, 5°C, 4°C, 3°C or below, and 12°C. London’s May overnight lows are historically distributed across a wide range. A forecast shift of even one or two degrees pushes the market into a different bracket entirely, which is why the NO probability sits at 60 percent. Any single competing outcome capturing a larger share of trader conviction would reprice the field quickly.

Momentum and Market Signals

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What the Price Movement Is Telling Us

The momentum composite, combining a flat one-hour change, an 8.5 percent 24-hour gain, and a trend score of 48.44, points to a single driver: updated numerical weather prediction models. Short-range forecasts for May 6 London low temperatures were almost certainly revised between May 4 and May 5, pulling capital toward the 9°C bracket.

Total volume on this contract sits at $7,668, with $6,890 of that moving in the last 24 hours. Liquidity depth is $9,887. These are thin-market conditions. Volume below ten thousand dollars means a single mid-sized trade can shift the displayed probability by several percentage points. The 9°C price could move sharply if any further forecast update lands before resolution.

• The 24-hour price gain of 8.5 percent arrived alongside updated European and UK Met Office model runs, consistent with a narrowing forecast cone pointing toward the 9°C range.
• The trend score of 48.44 sits just below the midpoint of a 0-100 scale, reflecting modest but real directional momentum rather than a strong consensus signal.
• The one-hour flat reading suggests the initial repricing has paused, likely as traders wait for the next model update cycle before adding more capital.
• Open interest is recorded at zero, which on Polymarket typically reflects a data artifact rather than true absence of positions, but confirms this is a lightly traded market.
• Thin liquidity of $9,887 means the 40 percent probability is more fragile than a deep-market contract at the same price level.

Lines Analysis: London Temperature on May Six

The UK Met Office and European Centre for Medium-Range Weather Forecasts both run high-resolution models for London surface temperature. As of May 5, the convergence of forecast ensembles toward a low in the 9-10°C range is the clearest driver of the 8.5 percent 24-hour move into the 9°C bracket. Early May in London typically sees overnight lows between 7°C and 11°C. A 9°C reading is squarely within climatological norms, which is why the market has assigned it the plurality position.

The 60 percent NO probability is not primarily a bet that temperatures will be extreme. It reflects the spread across multiple nearby brackets, especially 8°C and 10°C. The Met Office’s short-range ensemble spread for London on May 6 likely shows meaningful probability mass in both adjacent brackets. A warmer-than-expected air mass pushing overnight lows toward 10°C or 11°C would drain capital from the 9°C bracket fast. So would a cold northerly flow dropping the reading to 8°C or lower.

• The Met Office 5-day forecast for London on May 5 is the single most important data input before resolution.
• A shift in the ECMWF ensemble mean toward 10°C would reprice the 9°C bracket downward and lift the 10°C contract.
• Any deepening low-pressure system over the North Atlantic could bring cold northerly winds and push London’s overnight reading toward 8°C or below.
• Anticyclonic conditions, which are common in early May, tend to lock in mild overnight temperatures, supporting the 9-10°C range.
• The resolution timestamp of 2026-05-06 12:00:00 UTC is tight. Late forecast updates on May 5 evening UTC carry significant repricing potential.

The $7,668 in total volume reflects a market with limited trader depth. The data leans toward the 9°C bracket based on recent model convergence, but the thin liquidity means this probability is more a snapshot of current forecast consensus than a stable market equilibrium. The NO side holds the structural advantage simply through bracket diversification.

LINES VERDICT

Thin Market, Narrow Forecast Window

The 9°C bracket has earned its 40 percent lead through real forecast movement, but nine competing outcomes and $7,668 in total volume make this probability fragile. Here’s what the measurements are telling us: the models pointed here, the money followed, and the next model run could easily redirect both.

What the market says: A 40 percent probability means the market treats 9°C as the most likely single outcome but not the probable outcome. With resolution at 2026-05-06 12:00:00, the remaining forecast update cycles before tomorrow morning carry more weight than the current price implies in a thin-liquidity contract.

Key unknown: The UK Met Office deterministic forecast for London overnight low on May 5 evening is the single data release that would most reprice this contract before resolution. Any model shift of one degree in either direction moves the plurality to a competing bracket.

Scientific Context: London May Temperature Climatology

London’s mean daily minimum temperature in May sits near 9°C based on long-term UK Met Office climatological records. That baseline alignment is exactly why the 9°C bracket attracted the plurality position. Historical variability across May overnight lows spans roughly 4°C to 14°C in any given year, meaning adjacent brackets carry genuine resolution probability. The market is pricing uncertainty, not science. The climatology supports 9°C as modal, but modal outcomes in short-range weather forecasting carry meaningful miss rates even at 24-hour lead times.

Frequently Asked Questions

• What does 40 percent probability mean here? The market estimates a 40 percent chance that London’s official lowest temperature on May 6 falls specifically in the 9°C bracket, making it the single most likely outcome across ten options.
• How does the NO contract pay out? The NO position wins if any of the nine other temperature brackets, ranging from 3°C or below up to 13°C or higher, matches the recorded London low on May 6.
• What data release would move this price most? The UK Met Office deterministic forecast and ECMWF ensemble update for London on May 5 evening UTC are the primary inputs. A one-degree shift in the forecast low reprices the field immediately.
• When does this market resolve? Resolution occurs at 2026-05-06 12:00:00 UTC, using the official London temperature data referenced by the Polymarket resolution source.
• Is the $7,668 volume reliable for pricing? No. Total volume below ten thousand dollars means thin liquidity of $9,887 makes this price fragile. A single trade of a few hundred dollars can shift the displayed probability by several percentage points.

This analysis reflects market conditions as of 2026-05-05 08:11:59. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-06 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.