Highest temperature in Tokyo on July 27?

Platform comparison

Market context

Tokyo’s forecast high on 27 July is the real event here, but the market resolves to the *highest observed temperature* at Tokyo Haneda Airport Station, so the focus is on the day’s actual peak rather than a single midday reading. On Polymarket, the crowd is currently clustering around **30°C** and **31°C**, with 30°C the leading outcome at 39%; that is a useful reference point for how traders are pricing the day’s heat profile.[1]

For context, Tokyo in late July is normally hot, humid and often wet, with typical daytime temperatures in the high 20s to low 30s Celsius and humidity that can make it feel hotter than the thermometer reading.[2][3] That means the market is usually driven by whether Tokyo gets a genuinely hot afternoon rather than by the calendar alone. A 0% YES for any single higher band would be more credible on a cooler, rainy day; here, the better comparison is whether the station reaches the low-30s, which is consistent with published July weather norms.[2][3]

The main catalysts are the local forecast for Tokyo, the timing of any clear-sky sunshine after morning cloud or rain, and whether temperatures peak before or after the market’s settlement cut-off at 12:00 UTC, which is 21:00 in Tokyo. Watch for updates from Japan’s meteorological services and airport-area forecasts, because a modest shift in afternoon warmth can move the highest daily reading by a full degree or two. Platform mechanics also matter: Polymarket shows prices as implied probabilities, whereas Kalshi and Betfair-style books usually present contract prices or decimal odds, with fees and KYC access varying by venue, so the same weather view can look less or more attractive depending on the platform.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Tokyo on July 27? 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

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

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.