Lowest temperature in Hong Kong on July 31?

Platform comparison

Market context

Hong Kong’s late-July overnight low is the key number here, and the crowd is effectively pricing in a *very warm* outcome: a 2% YES implies a near-certain expectation that the day’s minimum will sit in the top temperature bands rather than anywhere near a cool-break low. In handicap terms, the favourite is not a cold snap but the usual summer baseline of muggy, high minima, so the consensus appears anchored around the high-20s Celsius. That leaves value more on contrarian heat-trader positions than on expecting a materially cooler-than-normal reading, unless rain-bearing weather pushes the morning minimum down faster than the market expects.

Historically, Hong Kong’s July climate makes low-end surprises rare but not impossible. WeatherSpark’s July profile shows daily lows clustering around 28°C, with extremes only modestly below that in typical years, while Travel China Guide’s day-by-day July norms put 31 July’s low near 27.0°C[7][2]. The Hong Kong Observatory’s own records show that July can still produce a much lower daily minimum when heavy rain or a tropical disturbance arrives; in 2019, rainfall linked to Wipha dragged the Observatory minimum on 31 July down to 24.5°C, the month’s lowest reading[3]. That is the sort of tail event that matters for this market: the base case favours a warm floor, but the underdog case is a weather-driven dip into the mid-20s.

For traders, the main catalyst is the Observatory’s final “Daily Extract” for 31 July, which will not resolve until published on the Hong Kong Observatory climate page[12]. The practical watchlist is the morning synoptic set-up: whether showers, thunderstorm bands, or a tropical influence are present around dawn, because that is when the day’s minimum is usually set. With the settlement window closing at 12:00 UTC, the market is exposed to any last-minute overnight rain or cloud cover that suppresses the minimum before the final reading is locked in.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Lowest temperature in Hong Kong on July 31? 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 2026, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 2026 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.