Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
55% | 45% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
55% | 45% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Go to the live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Go to the live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Go to the live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Go to the live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 27°C | 55% |
| 26°C | 44% |
| 28°C | 4% |
| 29°C | 1% |
| 22°C or below | 0% |
| 23°C | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C or higher | 0% |
Market context
Seoul's Incheon International Airport will record a daily high temperature on 16 August 2026, measured at the official meteorological station and logged in Weather Underground's Daily Observations table. The settlement hinges on which temperature bracket contains that single highest reading, with resolution sourced directly from Wunderground's primary observational data rather than summary figures.
August temperatures at Incheon typically range between 26–32°C, though extremes have occasionally exceeded 35°C during heat waves. Historical records show that mid-August peaks are influenced by the East Asian summer monsoon's retreat and Pacific high-pressure systems. The current zero probability assigned by the crowd suggests either extreme confidence in a specific temperature band or insufficient liquidity across all ranges. Comparable weather markets on similar Korean stations have resolved across the full distribution when sufficient time remains before settlement; the 2026 window allows for seasonal pattern analysis from prior years' meteorological archives.
Traders should monitor the Korea Meteorological Administration's seasonal forecasts, typically issued monthly, which may signal anomalous heat or cooler patterns ahead of mid-August. Real-time tracking of the Pacific subtropical high's positioning in late July and early August will indicate whether conditions favour above-average or below-average temperatures. Any tropical cyclone activity in the Western Pacific during the week preceding 16 August could materially shift wind patterns and cloud cover, directly affecting daytime heating. The settlement window closes at 12:00 UTC on the day itself, allowing only morning observations before resolution becomes final.
Methodology
This overview of Highest temperature in Seoul (Incheon) on August 16? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.
Resolution & payout
On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.
FAQ
- Do I need to KYC for Is Kalshi Legal in California?
- Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.
- How are winnings taxed?
- Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.
- Can I trade anonymously?
- Pseudonymously, yes — up to the KYC threshold. Is Kalshi Legal in California stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.
- What happens during a tax audit?
- You're responsible for documenting your trades. Is Kalshi Legal in California exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Is Kalshi Legal in California would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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