Highest temperature in Shenzhen on July 20?

Platform comparison

Market context

Shenzhen is experiencing extreme heat today, with Bao’an International Airport recording 31°C under sunny skies and a RealFeel of 40°C driven by 78% humidity. The prediction market for the highest temperature on 20 July 2026 currently shows a 0% implied probability for any outcome, suggesting the crowd believes the event has already passed or the data is inaccessible. However, since today is 20 July 2026 and the settlement window ends at 12:00 UTC tomorrow, the market remains technically open for final temperature readings to be logged before closure.

Historical data for late July in Shenzhen shows daily highs consistently between 32°C and 35°C, with Bao’an Airport often hitting 34°C during peak summer heatwaves. Comparable cases from 2023 and 2024 recorded maximums of 35.1°C and 34.8°C respectively, indicating that a 0% probability for any temperature range is statistically anomalous unless the market assumes no valid data will be published. This divergence between sportsbook-style odds (which would typically assign non-zero probability to plausible weather outcomes) and the current zero-implied line suggests a potential pricing error or liquidity gap on the platform.

Traders should monitor Wunderground’s hourly updates for Bao’an Airport, as the resolution source depends entirely on the highest temperature recorded by 12:00 UTC tomorrow. Any delay in data publication or station malfunction could invalidate the market, but recent forecasts show showers with a 70% precipitation chance later tonight, which may suppress temperatures below 32°C [2]. Analyst consensus on similar weather contracts typically assigns 15–25% probability to the 32–34°C range, making the current 0% line a notable outlier worth cross-checking against Kalshi’s weather derivatives for Shenzhen.

Sources: 1 · 2

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram 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.