Highest temperature in Paris on August 1?

Platform comparison

Market context

Paris is being priced as a fairly ordinary early-August warmth outcome rather than a heatwave extreme, with the market’s crowd-implied 0% on **YES** suggesting traders do not expect the station’s highest reading on 1 August 2026 to fall in the specified target range. That sits against the seasonal backdrop for Paris, where average early-August highs are typically in the low-to-mid 20s Celsius, while the station’s historical August extremes can still reach the high 30s in exceptional years.[1][4][6]

The main historical frame is that Paris can overshoot its norm sharply when continental heat builds, but those spikes are infrequent and usually need a broader regional heat plume rather than a one-day fluctuation. Comparable records show 1 August has occasionally produced very hot afternoons, including 35.5°C in the Paris records cited for that date, while the city’s all-time highs are above 40°C, underscoring why traders usually watch the upper 20s and low 30s as the more realistic settlement band in summer markets.[4][6][14]

The key catalyst to watch is the forecast path into the morning of 1 August, especially whether model runs keep Paris under a stable high-pressure regime or shift towards hotter advection and a deeper boundary-layer peak. Polymarket’s own market page points to current numerical weather prediction models from Météo-France and ECMWF clustering near a daytime maximum around 28.5°C, with the live order book already anchored on 29°C and 28°C as the leading outcomes.[2] The more this forecast signal leans towards a clear-sky, moderate-warm day, the less room there is for a high-end surprise at Paris-Le Bourget Airport Station, which is the settlement source.[2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Paris on August 1? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

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.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Trump Prediction route into the same order book at 0% fees.

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.