Highest temperature in Hong Kong on July 2?

Platform comparison

Market context

Hong Kong is bracing for a potentially record-breaking heatwave on 2 July 2026, as the Hong Kong Observatory forecasts normal to above-normal temperatures for the coming summer months[1]. The market in question assesses whether the highest temperature recorded on that date will fall within a specific range, yet the current crowd-implied probability of a “YES” outcome sits at 0%, suggesting traders believe the threshold is unlikely to be met. This stark divergence contrasts with analyst consensus, which leans toward above-average highs, and sportsbook lines that often price extreme heat events more generously than prediction markets do.

Historical data frames this low probability with caution: July 2026 is expected to see daily highs between 86°F and 96°F (30°C–35.6°C), with an average of 89°F (31.7°C)[2]. While 2023 marked Hong Kong’s hottest summer on record with a mean of 29.7°C, recent May 2026 readings already hit 34.6°C (94.3°F), and some areas like Sheung Shui recorded 36.7°C (98.1°F) during a heatwave[4][7]. These figures indicate that while extreme heat is plausible, the specific range in question may be set too high for the 0% probability to shift without a major climatic spike.

Traders should monitor the Observatory’s upcoming “Daily Extract” publication, which finalises the “Absolute Daily Max” data for 2 July[1]. The settlement window closes at 12:00 UTC on 2 July 2026, and no resolution occurs until this data is officially released. Recent news from the Observatory warns that summer 2026 could be hotter than normal, reinforcing the need to watch for real-time temperature updates and any amber rainstorm warnings tied to intense heatwaves[4][7]. The key dependency is the timely release of the finalised extract, which will determine the market’s outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on July 2? 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 PolyGram, 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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.