Highest temperature in Shenzhen on July 31?

Platform comparison

Market context

Shenzhen’s airport should be dealing with a mid-summer heat profile, with July normals around 31°C for daytime highs and daily lows near 26–27°C, so the market is effectively asking whether the station gets anywhere near the upper end of its seasonal range rather than the month’s average. Historical summaries for Shenzhen show a long-run July mean high of about 31.1°C, with records reaching 38.7°C citywide, which underlines how far a single hot afternoon can run above the norm.[1][14]

The 0% crowd-implied probability of a “YES” outcome is best read as a pricing artefact rather than a weather judgement: the settlement is tied to the highest temperature recorded at Shenzhen Bao’an International Airport Station, and these markets can move sharply once the day’s maximum becomes visible on the official history page. Comparable July data also show that even on hot days the airport can finish in the low- to mid-30s Celsius, with forecast-style climate guides putting typical July highs around 32–34°C.[2][16][20]

For traders, the key catalyst is the intraday temperature peak at the airport station, not a later daily average or citywide reading. The main dependency is whether Shenzhen gets a brief heat spike before local afternoon convection or sea-breeze effects cap the maximum; the market will lean on the station’s eventual high as logged on Wunderground, while NOAA’s time-series page for ZGSZ provides an additional live reference point for the same airport location.[8][18]

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 Shenzhen on July 31? 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.

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 Election Predictions UK 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.

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.