Highest temperature in Shenzhen on August 7?

Platform comparison

Market context

Shenzhen’s highest temperature will be set by the day’s actual airport observation, not by the broader daily summary, so a programmatic read should target the Weather Underground Daily Observations table for Shenzhen Bao’an International Airport and map the peak Celsius value into the market’s outcome bands. That matters because the contract resolves to the *highest* recorded temperature on 7 August 2026, which is a point-in-time reading rather than a forecast average or daily high figure.

Historically, Shenzhen in August is usually hot and humid, with typical highs around 32°C and many sources showing day-by-day peaks in the low-to-mid 30s, including 35°C on 7 August in one climate guide and around 32°C in several monthly climatologies.[1][6][11][12][14][19] That backdrop makes the currently implied 0% YES probability stand out: it is hard to reconcile with a city whose August temperatures commonly sit near the contract’s lower and middle buckets, unless traders are effectively pricing in a late-day cooling bias or simply thin liquidity around a date-specific weather event.[1][6][11][12]

The main catalysts are weather-system updates rather than fixed announcements: typhoon tracks, monsoon rainfall, and official local warnings can quickly change the intraday ceiling, especially in coastal Guangdong where August is within the wetter, storm-prone part of the year.[11][14][19] A practical workflow is to watch hourly forecasts, airport observations, and any severe-weather alerts, then update positions only when the expected maximum moves across a strike boundary; that approach is more robust than trading on the headline forecast alone because resolution depends on the observed maximum in the source table, not a projected high.[1][17][18]

Sources: 1 · 2 · 3 · 4 · 5

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 Kalshi Fees, 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 Kalshi Fees. 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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.