Highest temperature in Shanghai on August 3?

Platform comparison

Market context

Shanghai’s temperature call for 3 August is being made against a backdrop of peak summer heat rather than a marginal seasonal day. Forecasts for the month cluster around the high 20s to low 30s Celsius, with AccuWeather putting Shanghai’s August highs broadly between **82°F and 92°F** and WeatherSpark showing typical August daily highs around **85°F to 90°F**. On that basis, a crowd-implied **0% YES** looks detached from the normal climatology rather than from any clearly unusual cooling signal.[1][12]

The historical frame matters because the market resolves on the **highest** temperature recorded at Shanghai Pudong International Airport, not the afternoon peak forecast alone. A day that starts warm and turns hotter later can still settle into the upper buckets even if early readings look modest, which is why comparable August forecasts from multiple sources repeatedly show persistent heat and humidity in Shanghai.[5][8][15] In other words, the relevant question is not whether it will be warm, but whether the day clears the threshold for the market’s target range.[1][12]

For traders, the main catalyst is the live weather trajectory rather than any scheduled announcement: whether showers, cloud cover, or a sea-breeze pattern suppress the airport’s daytime maximum, or whether the heat builds into the afternoon. The most useful watchpoints are the hourly forecast updates and the observed readings at Pudong, alongside any late-shifting rain chances; current guidance from the Met Office and similar forecasters still shows high summer temperatures with only limited precipitation risk in the short range.[5][7][13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Shanghai on August 3? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Election Predictions UK route into the same order book at 0% fees.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.