Highest temperature in Tokyo on August 8?

Platform comparison

Market context

Tokyo’s mid-summer heat is the real-world driver here: the market resolves off the highest **observed** temperature at Haneda on 8 August, so the key question is whether the city’s warmth pushes into the mid-30s Celsius or stays clustered around the low-30s. The crowd is currently leaning heavily on a **34°C** print, with **33°C** also well backed, which suggests traders are pricing a hot but not extreme afternoon rather than an exceptional heat spike.[1]

Historically, Tokyo’s August climate gives that pricing some context. Long-run August averages sit around **31°C** for daytime highs, while weather summaries for the city commonly point to highs in the low 30s and frequent humidity, which makes 33–34°C a plausible outcome on a sunny day.[5][8][15][16] That said, the market’s current 0% yes probability implies participants are effectively dismissing the chance of any higher bin becoming competitive, so the comparison case is a normal summer surge rather than a record-setting heat event.[1][11]

The main catalyst to watch is the day’s actual temperature trace at Haneda rather than any headline forecast, because the contract settles on the Daily Observations table and can still update until the first data point for the following date appears.[1] Near-term forecasts have already pointed to roughly **34°C** for Tokyo on 8 August, which is consistent with the market’s centre of gravity.[1][3] Traders should therefore watch midday-to-afternoon heating, cloud cover and sea-breeze effects most closely, since those are the factors most likely to decide whether the final reading lands at **33°C**, **34°C**, or one of the nearby bins.[1][10]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Tokyo on August 8? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Trump Prediction provide a 0%-fee route into the same order book.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

UK Frequently Asked Questions

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Are UK election prediction markets available from the UK?

Yes. Betfair Exchange and Smarkets offer UKGC-regulated UK election markets (seat counts, party share, constituency results). Polymarket also lists UK election contracts with deeper global liquidity. Betfair winnings are typically tax-free for UK individuals; Polymarket profits are subject to HMRC CGT.