When does Autumn 2026 officially start? Meteorological and astronomical autumn explained

Summary

Autumn's start date varies: meteorological autumn begins September 1, while astronomical autumn starts on the Autumnal Equinox, September 23 in 2026. Meteorological seasons are fixed three-month blocks based on temperature trends, aiding climate data comparison. Astronomical autumn is determined by Earth's orbit and the equinox, causing slight date shifts annually.

Key Takeaways

1. Meteorological autumn always starts on September 1 and finishes on November 30.
2. Astronomical autumn starts on the Autumnal Equinox – which in 2026 lands on September 23, and finishes on December 21.
3. The clocks go back one hour on the last Sunday of October – in 2026, that’s Sunday, October 25 – returning the UK to Greenwich Mean Time (GMT).

Statement Breakdown

• Claimed Facts: 80% of statements the article presents as facts
• Opinions: 15% of statements classified as editorial or subjective
• Claims: 5% of statements surfaced for additional reader evaluation

Credibility & Bias Reasoning

Credibility assessment: The article presents factual information about meteorological and astronomical autumn. It clearly distinguishes between the two definitions and provides specific dates. However, it lacks in-depth analysis or expert commentary, relying on general explanations.

Bias assessment: Informative Explainer. The article's primary goal is to explain two different ways of defining the start of autumn. It presents both meteorological and astronomical definitions neutrally, without favoring one over the other or injecting opinion.

Note: This article provides a straightforward explanation of meteorological and astronomical autumn. While factually sound, it offers limited depth and no expert opinions.

Credibility flag: Informative, but basic

Claimed Facts (10)

• This statement factually differentiates the two approaches to defining seasons.
• This provides a specific, verifiable date for meteorological autumn.
• This provides a specific, verifiable date for astronomical autumn in a given year.
• This factually describes the structure of meteorological seasons.
• This factually outlines the months for spring and summer in the meteorological system.
• This factually outlines the months for autumn and winter in the meteorological system.
• This factually explains the basis for astronomical seasons.
• This factually describes a characteristic of the equinox.
• This factually explains why astronomical dates can vary.
• This provides a specific, verifiable date for the UK clock change in 2026.

Opinions (6)

• This statement expresses a subjective viewpoint on the ambiguity of the start date.
• This is a subjective statement about the validity of different definitions.
• This statement offers an opinion on the utility of the meteorological system.
• While based on astronomical principles, the phrasing 'tilts further away' can be seen as a simplified interpretation rather than a strict scientific statement.
• This is a descriptive statement about the consequences of the Earth's tilt, presented as a general observation rather than a precise scientific measurement.
• This statement presents a subjective interpretation of the benefits of the clocks going back.

Claims (6)

• This is a generalized, somewhat evocative statement that is not a precise factual claim and could be considered a mild appeal to common experience.
• This is a rhetorical question designed to engage the reader, rather than a factual claim.
• This is not a statement of fact, opinion, or dubious claim but an indicator of advertising content.
• This is not a statement of fact, opinion, or dubious claim but an indicator of advertising content.
• This is not a statement of fact, opinion, or dubious claim but an indicator of advertising content.
• This is not a statement of fact, opinion, or dubious claim but an indicator of advertising content.

Key Sources

• Alex Nelson — Author