Highest temperature in Beijing on July 5?

Platform comparison

Market context

The underlying event is the peak temperature recorded at Beijing Capital International Airport on 5 July 2026, a date historically prone to extreme heat. July is Beijing’s hottest month, with daytime highs typically spanning 25°C to 33°C and maximums occasionally reaching 38°C or higher[1]. In 2023, the month’s peak hit 40°C, while the city’s all-time record for 5 July stands at 42.1°C in 2010[4][5]. Given this history, the current crowd-implied probability of 0% for a “YES” outcome (likely meaning a temperature above a specific threshold) appears misaligned with seasonal reality; a power-user would programmatically back-test this by querying Wunderground’s historical daily maxima for 5 July across the past 20 years to validate the threshold’s plausibility[7].

Traders must monitor real-time heatwave forecasts and humidity levels, as high moisture content can push temperatures beyond dry-air expectations. Recent national data shows China recorded its hottest month in recent history in July 2024, with averages eclipsing 23.21°C, signalling a warming trend that could elevate 2026 peaks[3]. A key catalyst is the China Meteorological Administration’s weekly extreme-weather bulletin, which often precedes 3–5 day heat spikes; a bot would scrape this feed for alerts on “high-temperature orange” warnings, which correlate with airport readings exceeding 38°C[3]. Additionally, the monsoon onset schedule is critical: delayed rains in early July increase the risk of record highs, as seen in 2023 when humidity amplified the 40°C peak[4]. Programmatic approaches should integrate these dependencies into conditional orders, triggering buys only when humidity exceeds 70% and forecast highs breach 37°C.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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 Polymarket Bot UK 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.