Highest temperature in Shanghai on July 13?

Platform comparison

Market context

Shanghai’s highest temperature on 13 July 2026 will be recorded at the Pudong International Airport station, with forecast models consensusing on a peak between 32°C and 34°C [1][3]. Historical July data for the region shows daytime highs routinely exceeding 30°C, often reaching 35°C or more amid high humidity [5]. The current 0% YES probability on Polymarket implies the market expects the temperature to fall outside the specific range offered, a divergence from Kalshi’s decimal-odds format and Betfair’s implied-probability display, where traders might price in a 60–70% chance for a 33°C outcome based on the same forecast consensus [3].

Traders should monitor real-time updates from Wunderground, the official resolution source, as well as hourly forecasts from Yr and AccuWeather, which currently show a maximum of 33°C for 13 July [1][10]. No major weather announcements are scheduled, but the dependency on a single station means localized cloud cover or wind shifts could alter the peak reading. Fee structures and KYC requirements differ sharply across platforms: Polymarket operates with minimal KYC and lower fees than Kalshi’s US-regulated model, while Smarkets and Betfair apply commission-based pricing that could erode returns on low-probability bets [3].

The settlement window closes at 12:00 UTC on 13 July, locking in the final temperature reading. Given the 0% implied probability, the market likely prices in a range below 30°C or above 35°C, though historical averages suggest a 30–31°C high is more typical for early July [9]. Platform choice affects execution: Kalshi’s US-only access contrasts with Polymarket’s global reach, and decimal odds on Kalshi may offer clearer risk-reward clarity than implied probabilities on Betfair for this weather event [3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Shanghai on July 13? 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.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

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.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.