The filed question concerns whether the maximum at EGLL on 22 October reaches at least 16°C. It cannot be answered by a city forecast for a different place or time window.
What the primary record establishes
The CFTC register records a GMNI Heathrow temperature filing as Certified on 19 October 2026. Its question refers to 22 October 2026, which is still a future observation date at this article’s 21 October cutoff. This article reports the contract’s terms, not the eventual weather. CFTC product filing 65480 — GMNI Heathrow temperature, 19 October 2026 ↗
The attached document specifies maximum temperature at Heathrow station EGLL, using the London local measurement day, with an inclusive threshold of 16°C. It names NOAA/NWS METAR data as the primary reference and specifies fallback sources including Weather Underground and The Weather Company. GMNI terms — EGLL maximum temperature on 22 October 2026 ↗
What the distinction changes
A forecast and a settlement observation serve different purposes. A forecast can change before the day arrives; an observation must still satisfy the contract’s station, day and source rules. An app showing a temperature for central London does not by itself resolve a Heathrow contract.
The inclusive threshold also matters: an accepted observation of exactly 16°C meets an at-least-16°C condition. That is an explanation of the operator, not a claim that such an observation has occurred. Do not confuse daily maximum with an instantaneous reading.
What to check before drawing a conclusion
Record the station code, local calendar date, unit and source hierarchy before looking at prices. If the primary publication is delayed or unavailable, consult the document’s timing and fallback provisions instead of selecting whichever website produces a preferred answer.
WFN does not infer a future temperature from the filing or treat its registry status as weather confirmation. A defensible settlement explanation needs the actual qualifying data and the applicable contractual procedure once those data become available.