Highest temperature in Shenzhen on July 20?

Platform comparison

Market context

Shenzhen is currently under a thick overcast with drizzle and a 75% chance of precipitation, suppressing any immediate heat spike as the day nears its end. The real-time temperature at Bao'an International Airport sits at 84°F (29°C) with a RealFeel of 95°F, while the official daily high forecast for Monday is 87°F (31°C) [3][7]. This cloudy, wet pattern explains the market’s 0% YES probability for extreme heat, as the atmosphere lacks the clear-sky radiative heating required to push temperatures significantly higher before the settlement window closes.

Historically, July highs at this station typically range between 84°F and 94°F (29°C–34°C), with an average high of 89°F (32°C) [2]. The current 31°C forecast aligns with the lower end of this band, consistent with the 29°C frontrunner outcome dominating the market at 100% probability [4]. Comparable cases from recent years show that when moderate rain and heavy cloud cover occur in mid-July, maximum temperatures rarely breach 32°C, reinforcing the view that a significantly hotter day is statistically improbable under these conditions.

Traders should monitor the final hourly updates from Wunderground and AccuWeather for any late-afternoon clearing that might briefly elevate temperatures, though the forecast indicates rain will continue late tonight [3][8]. The primary dependency is whether the cloud cover persists through the peak heating window; if skies clear unexpectedly, temperatures could approach the 30–31°C range, but current data suggests the 29°C outcome remains the most likely resolution [5][9]. No official weather announcements are expected beyond routine hourly bulletins, making real-time sensor data the critical catalyst for any probability shift.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Prediction Today. 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.

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.

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