Highest temperature in Paris on August 18?

Platform comparison

Market context

# Market Context: Highest Temperature in Paris on August 18, 2026

The market concerns the peak temperature recorded at Paris-Le Bourget Airport on 18 August 2026, measured in degrees Celsius and sourced from Weather Underground's Daily Observations table. Settlement occurs at 12:00 UTC on that date, with resolution determined by the highest reading captured at the station rather than summary forecasts. The 0% crowd probability suggests traders currently expect no outcome within the specified range, though this reflects early-stage pricing rather than meteorological certainty.

August temperatures at Paris-Le Bourget historically range between 15°C and 28°C, with daily highs typically clustering around 24–26°C during mid-August. The 2003 European heat wave saw exceptional readings above 30°C, whilst cooler years have produced highs near 20°C. Recent decades show increasing frequency of readings above 25°C, though extreme outliers remain statistically uncommon. These patterns establish baseline expectations for what constitutes typical versus anomalous conditions for the settlement date.

Traders should monitor European weather forecasting updates from mid-August 2025 onwards, particularly from Météo-France and the European Centre for Medium-Range Weather Forecasts. Atmospheric pressure systems, jet stream positioning, and any developing heat domes over continental Europe will determine whether conditions favour above-average or below-average temperatures. The specific resolution methodology—prioritising Daily Observations over Day High & Low summaries—requires familiarity with Weather Underground's data structure to avoid disputes at settlement.

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 18? 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

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.

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.

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.

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.