Highest temperature in Hong Kong on June 22?

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Market context

Hong Kong’s 22 June high will be taken from the Hong Kong Observatory’s final “Absolute Daily Max” reading in Celsius, so the market is really a bet on whether the day finishes in the upper part of the seasonal range rather than on any intraday spike. The Observatory’s 2026 outlook says the year should be above normal and June–August temperatures are expected to run above normal, which supports a warm bias for the day’s eventual maximum.[1][9]

The 0% YES price looks hard to reconcile with the recent temperature backdrop. Hong Kong already posted 34.6°C as the hottest day of 2026 so far in June, and 2025 produced a June absolute maximum of 35.6°C, showing that the city can still deliver mid-30s readings even before peak summer arrives.[6][8] AccuWeather’s June profile also points to repeated highs around 88–92°F, which is broadly consistent with a hot-day outcome near or above 31°C.[2]

For traders, the key catalysts are the Observatory’s daily bulletin timing, any afternoon heat warnings, and whether cloud, rain or sea breeze suppresses the day’s final maximum before the settlement cut-off. The market settles in USDC on-chain, so it can move independently of broader crypto conditions, though risk appetite in BTC and ETH can still affect liquidity and pricing around event windows. If exchange funding turns sharply positive or whale flows concentrate into the market, that can matter for entry levels, but the resolution itself remains entirely dependent on the Observatory’s published extract.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Hong Kong on June 22? 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 for comparison. 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

Where can I trade this market with the lowest fees?

On BTC Prediction, which mirrors the Polymarket order book at 0% fees. 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 does it cost to trade on BTC Prediction?

Zero. BTC Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction triggers a quick verification flow that finishes in minutes.

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.