Pronóstico: Highest temperature in Tokyo on August 8?

Platform comparison

Market context

Tokyo is running hot enough that Polymarket’s contract is priced at **0% YES**, yet the live forecast still points to a high near the low-to-mid 30s Celsius, which is a very relevant band for a market that settles on the highest reading in Weather Underground’s Daily Observations table for Tokyo Haneda Airport Station.[2][7][8] In practical terms, buyers are not betting on the headline forecast alone; they are holding conditional tokens on a single observed daily maximum in Celsius, with settlement driven by the source-specific station record rather than any broader city average or summary box.[8]

That near-zero price is best read against Tokyo’s August climatology. Late summer in Tokyo typically delivers oppressive heat, and several current forecasts cluster around 33–35°C for today, which would be entirely in range for a high-temperature outcome if the airport station prints a late-afternoon peak.[5][9][12][19] For a trader on the Polygon-based, USDC-settled market, the key issue is not whether Tokyo is warm in general, but whether the observed station high lands in the contract’s resolution bucket and whether the final Weather Underground Daily Observations entry beats the earlier summary figures if the two differ.[8]

The main catalysts are timing and local weather evolution through the day: sunshine, cloud build-up, sea-breeze effects, and any late convective showers that could cap the high before the settlement window closes.[2][3][7] Forecast services currently show a hot, mostly sunny daytime pattern with some chance of late storms, so traders should watch intraday updates rather than only the morning outlook, since the resolution source is a station observation table and the highest value may arrive well before the market stops accepting new information.[2][3][7][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: Highest temperature in Tokyo on August 8? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Polymarket Qué Es. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 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.