Highest temperature in Tokyo on July 16?

Platform comparison

Market context

Tokyo faces a sweltering mid-July day as the settlement window for the Haneda Airport temperature market closes at noon UTC. The crowd currently assigns a 0% probability to the YES outcome, implying near-certainty that the peak temperature will fall outside the specific range being traded, despite the market’s frontrunner being 33°C at 40% and 34°C at 31% across the broader outcome set [1]. This stark divergence suggests the market is pricing in a specific threshold breach that traders may be misreading as impossible.

Historically, mid-July in Tokyo is dominated by the Pacific high, routinely pushing Haneda temperatures into the 32–35°C band, with 33°C and 34°C being the most frequent peaks in recent years [1]. The current 0% implied probability for the YES outcome appears to be an underdog play, potentially ignoring the strong seasonal baseline where temperatures exceeding 30°C are standard. Value likely sits on the contrarian angle that the market has overcorrected against the YES outcome, given that 33°C and 34°C remain the statistical favourites for this date.

Traders should monitor the live radar for Tokyo Haneda International Airport, which forecasts hot, humid conditions with a 25% chance of early rain and a thunderstorm tonight, potentially affecting daytime heat retention [2]. While no specific weather announcements are scheduled for 16 July 2026, the real-time Wunderground data will be the sole resolution source, making intraday volatility in the 93°F (34°C) forecast a critical catalyst [2]. The consensus is heavily skewed against the YES outcome, but the historical frequency of 33–34°C peaks suggests the value spot lies in betting against that 0% pricing.

Sources: 1 · 2

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.