Highest temperature in Shanghai on June 21?

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Market context

The relevant event is the highest temperature recorded at Shanghai Pudong International Airport on 21 June, measured in Celsius and taken from Wunderground’s daily history page for ZSPD. June in Shanghai is already the start of the hot season, with average highs at Pudong rising into the low 30s Celsius by late month and daily highs at the airport commonly sitting in the high 20s to low 30s, although cloud, rain and humidity can keep readings lower. [1][2][6][7]

A **0%** crowd-implied probability is difficult to reconcile with the climate baseline alone, because the airport’s June temperatures regularly sit well above the low-single-digit bands that would normally justify an extreme under. Comparable cases at this location are usually read through the local summer pattern rather than through isolated cool mornings: once the boundary layer clears, the day’s maximum often lands close to or above 30°C, and occasional sunny spells can push readings higher. [1][2][6] For a prediction market framed around the day’s maximum, the useful comparison is not the early-morning temperature but the expected afternoon peak and whether convection or rain caps it. [1][7]

The main catalysts are operational rather than regulatory: traders should watch the Shanghai forecast before the settlement window closes, especially shower timing, cloud cover and any heat or rain alerts that affect the afternoon maximum at Pudong. AccuWeather’s same-day outlook already points to cloudy, humid conditions with morning showers, which can restrain the high if they persist into peak heating hours. [4] On market access, German GlüStV rules matter because they can restrict participation from Germany-facing users, while US CFTC reach is relevant if the venue is treated as offering derivatives-like event exposure to US persons. A “no-KYC up to $1,500” threshold means small positions may be opened with lighter identity checks, but it does not remove geoblocking, sanctions screening or any jurisdiction-specific limits that may apply to this particular market.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Legal UK, which mirrors the Polymarket order book directly.

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

Is this market available outside the US?

Polymarket Legal UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Legal UK triggers a quick verification flow that finishes in 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.