Highest temperature in Hong Kong on June 30?

Platform comparison

Market context

Hong Kong faces a real-world weather event on 30 June 2026: the daily maximum temperature recorded by the Hong Kong Observatory, with the market currently pricing a 13% chance that it will exceed 32°C. This implied probability sits in stark divergence from the Polymarket frontrunner, which assigns a 60% chance to the 32°C outcome and 28% to 31°C, suggesting a significant misalignment between cross-platform odds and the specific contract being traded [1]. Analyst consensus, bolstered by the Observatory’s seasonal forecast for June–August 2026, expects above-normal temperatures across the region, driven by ENSO conditions and climate models [3][8].

Historical June data shows daily highs typically ranging from 86°F to 91°F (30°C–33°C), with the average high at 89°F (32°C), framing the current 13% probability as potentially conservative given the forecast for abnormally high heat [6][8]. The Observatory has already warned of extreme heat in the New Territories, with temperatures expected to hit 37°C on adjacent days, reinforcing the likelihood of elevated readings on 30 June [9]. Traders should monitor the finalisation of the “Daily Extract” data from the Hong Kong Observatory, as the market cannot resolve until this official record is published [1]. No new announcements are expected before the settlement window ends, but the dependency on the Observatory’s absolute daily max figure remains the critical catalyst for price movement [3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on June 30? 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

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.

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 fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.