Highest temperature in Hong Kong on July 13?

Platform comparison

Market context

Hong Kong faces a critical heat test on 13 July 2026, as the Hong Kong Observatory will record the day’s absolute maximum air temperature to settle a prediction market on btc-prediction.bet. The contract resolves to the Celsius range containing the highest official reading, with settlement in USDC and a final deadline of 12:00 UTC. Current crowd-implied probability sits at 0% for any outcome, suggesting traders expect data delays or a resolution outside standard ranges, though historical July peaks in Hong Kong regularly exceed 35°C.

Historical records show Hong Kong has endured extreme July heat, with Sheung Shui reaching 39°C and Yuen Long Park hitting 38.4°C in a record-breaking July day [1]. The Hong Kong Observatory defines days exceeding 35°C as “extremely hot,” and 2026 is forecast to be one of the region’s hottest years on record [4][10]. Given that average July highs range from 30°C to 34°C, with urban peaks often reaching 35°C, the 0% probability appears misaligned with climatic baselines unless the market awaits official data publication [2][8].

Traders should monitor the Hong Kong Observatory’s Daily Extract for the finalized “Absolute Daily Max (deg. C)” value, which is the sole resolution source [1]. The settlement depends entirely on this official publication, which may lag by hours or days after the event. Recent forecasts indicate normal to above-normal temperatures for July–September 2026, influenced by ENSO conditions and climate models [7]. No crypto-specific catalysts directly affect this weather contract, but USDC liquidity and BTC/ETH volatility could influence capital flow into the market as traders assess timing risk around data release.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Hong Kong on July 13? 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 volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

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.