Highest temperature in Shanghai on August 9?

Platform comparison

Market context

Shanghai’s airport reading on 9 August is shaping up as a **hot, wet day**, with the main forecast range clustering in the **mid-30s °C at best** rather than near record heat. AccuWeather’s August outlook shows Shanghai daily highs mostly between **84°F and 94°F** in this period, while its 9 August forecast calls for **85°F** with rain and strong cloud cover; Time and Date is similar at **84°F/78°F** with heavy rain, and Weather Underground’s final settlement source may still show a different *observed* peak once the day is over.[1][3][4]

For a market sitting at **0% YES**, the historical frame matters: August in Shanghai is normally very warm, but the bigger swing factor is whether rain and convection suppress the daytime peak before the observing station records it. Long-run climate guides put typical August highs around **31–32°C**, with a humid, typhoon-prone pattern that often caps extremes when rainfall arrives, so the relevant comparison is not whether Shanghai is hot in general, but whether the Pudong airport station logs a maximum inside the chosen range on the calendar day.[9][15][19]

The catalyst traders should watch is the **updated forecast track into the weekend**, especially any shift in rainfall timing, thunderstorm coverage, or wind direction that could alter the observed high at Pudong before noon UTC on 9 August. AccuWeather’s 10-day page and Time and Date both point to rain and overcast conditions on 9 August, which is the key dependency for the temperature outcome; unless that pattern breaks, the market is leaning on the weather model consensus rather than any scheduled declaration-style event.[4][7]

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 9? 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.

UK Frequently Asked Questions

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.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

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 Trump Prediction route into the same order book at 0% fees.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

Are UK election prediction markets available from the UK?

Yes. Betfair Exchange and Smarkets offer UKGC-regulated UK election markets (seat counts, party share, constituency results). Polymarket also lists UK election contracts with deeper global liquidity. Betfair winnings are typically tax-free for UK individuals; Polymarket profits are subject to HMRC CGT.