Highest temperature in Shanghai on August 9?

Platform comparison

Market context

Shanghai’s highest temperature on 9 August is shaping up as a rain-interrupted, late-summer heat test rather than a straightforward scorch. The main forecasting services cluster around the low-to-mid 30s Celsius for the city, but with a wet, windy set-up: AccuWeather shows 85°F/29°C with heavy rain and a 97% chance of precipitation, while other outlets are broadly similar or slightly warmer, ranging from about 29°C to 35°C for the day.[5][7][9][13][14] Against that backdrop, the market’s 0% YES implies traders are effectively pricing out any outcome above the contract’s chosen temperature band, which looks notably more conservative than the weather guidance.

Historically, Shanghai in August often sits near 31°C daytime highs, with humidity doing as much work as the thermometer in making conditions feel oppressive.[6][16][18] Recent forecast pages for 9 August are still well within that seasonal envelope, even when they lean cooler because of rain.[1][2][4][8] For comparison, the market title and rules matter here: it settles on the highest reading at Shanghai Pudong International Airport as recorded in Weather Underground’s Daily Observations table, not the summary high/low figure, so a brief midday spike would matter more than the headline forecast high. That distinction is important because airport observations can diverge from citywide forecast models and summary pages.

The key catalysts are the timing and intensity of any rain bands, thunderstorm bursts, and wind shifts on the morning and early afternoon of 9 August, when the settlement window is still open. AccuWeather and Time and Date both point to sustained precipitation and gusty conditions, which can suppress the daily maximum if cloud cover arrives early, but convective breaks can still produce a short-lived warm-up.[5][7][8] With no obvious non-weather dependency in the contract, the live Wunderground observation feed at Pudong is the only practical source that should move expectations as the day unfolds.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shanghai on August 9? 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 PolyGram, which mirrors the Polymarket order book at 0% fees.

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 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.

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.

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.