Highest temperature in Shanghai on July 31?

Platform comparison

Market context

Shanghai’s **highest temperature on 31 July 2026** will be the figure that settles this market, using Wunderground’s Shanghai Pudong International Airport Station history page as the source. The crowd is pricing **0% YES**, which is consistent with the fact that the event has not yet resolved and with the market’s narrow settlement rule: it is not about an average, a citywide reading, or a forecast high, but the single maximum recorded at that specific station before the midday UTC cutoff.

For context, late-July Shanghai is usually hot and humid, and several forecast providers were showing highs in the low-to-mid 30s Celsius for 31 July, with some calling for the mid-30s and showers or thunderstorms. AccuWeather’s July page shows daily highs around 31–38°C for the end of the month, while Weather.com and Met Office-style forecasts point to a hot, unsettled day; that makes the likely resolution range easier to read than the exact number. Similar weather markets often diverge by book design: Polymarket and Kalshi quote implied probability directly, while Betfair and Smarkets trade in decimal odds, so the same weather expectation can look different even when the underlying view is identical. Fees and access also matter: exchange-style books can have lower visible spreads but charge commission, and KYC/geographic restrictions vary materially by platform.

The main catalysts are the live forecast updates, any overnight convection, and the timing of the day’s actual peak temperature at Pudong, which could occur well before or after market close in UTC terms. A warm, humid air mass with intermittent showers can still produce a high reading if sunshine breaks through briefly, whereas cloud cover or rain would cap the maximum; traders therefore watch hourly forecast revisions and radar more closely than the daily headline high.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Shanghai on July 31? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.