Highest temperature in Hong Kong on August 2?

Platform comparison

Market context

Hong Kong’s highest temperature on 2 August will be set by the Hong Kong Observatory’s final **Absolute Daily Max** reading for that date, measured in **one decimal place Celsius** and only fixed once the Daily Extract is published. That means the market is effectively a wait-for-data contract rather than a live weather forecast, and the 0% YES implied probability suggests the crowd is not pricing an immediate path to the relevant temperature band. The cash-settlement framing matters here: once the Observatory posts the final number, the contract should resolve mechanically to the matching range, with no discretion beyond the published HKO figure.[1][4]

Historically, early August in Hong Kong is firmly in the hot season, with normal daily maximums around **31.5°C** on 2 August and broader August highs commonly in the low 30s Celsius.[4][5] Recent summers have also been unusually warm: Hong Kong recorded its hottest summer ever in 2023, and August that year averaged **29.7°C**, the highest on record since observations began nearly 140 years ago.[8] That backdrop makes a sub-30°C outcome less typical than a low-30s print, although the market is about the single-day maximum, so cloud, thunderstorms, or rain can still pull the final reading down.

For traders, the key catalysts are the Observatory’s release timing and any late-day weather changes around Hong Kong International Airport and urban station readings, because the settlement source is the official HKO extract rather than a third-party forecast. In crypto terms, the contract is a pure USDC event bet, so BTC or ETH moves only matter insofar as they shift risk appetite, perp funding, or whale flow into prediction markets; the weather outcome itself is independent of broader digital-asset macro. The practical watchpoint is whether HKO publishes the final daily data promptly after the day ends, since the market cannot resolve until that publication appears.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Hong Kong on August 2? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

Are crypto prediction markets taxable in the US?

In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.