Highest temperature in Hong Kong on July 18?

Platform comparison

Market context

The Hong Kong Observatory will record the highest temperature in Hong Kong on 18 July 2026, measured to one decimal place in degrees Celsius. The market currently shows 0% implied probability across all temperature ranges, suggesting either incomplete odds distribution or early-stage liquidity. Settlement depends on the Observatory's official daily extract data, which typically becomes available within days of the measurement date.

Hong Kong's July temperatures are remarkably consistent. The Observatory's historical records show daily maxima in mid-July cluster tightly between 32°C and 34°C, with extreme outliers rare. The 30-year average high for mid-July sits around 32.5°C. Only exceptional heat events—typically driven by sustained high-pressure systems or tropical cyclone periphery effects—push readings above 35°C. The 0% probability across all ranges suggests the market has not yet populated meaningful odds, making this a data-collection phase rather than a settled consensus.

Traders should monitor the El Niño Southern Oscillation index and regional pressure patterns as July 2026 approaches, as these drive Hong Kong's summer heat variability. The Hong Kong Observatory publishes seasonal forecasts in June that often signal whether conditions favour above or below-average temperatures. Tropical cyclone activity in the Western Pacific during early-to-mid July could suppress temperatures through cloud cover and wind, whilst a stable high-pressure ridge would favour hotter readings. The settlement window closes at midday UTC on 18 July, allowing only morning hours for final trading before the Observatory's data becomes definitive.

Methodology

This page reviews Highest temperature in Hong Kong on July 18? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 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 Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.