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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the UK Bullet weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
“Under the weather” means feeling slightly ill, tired or low in energy. The live forecast above shows today’s conditions, which can affect how you feel—especially during seasonal changes when colds and aches are common.
What does “under the weather” mean?
The phrase describes a mild, temporary feeling of being unwell—often with symptoms like a headache, sore throat or fatigue. It is not a clinical term but a widely understood idiom.
- Commonly used for minor illnesses rather than serious conditions.
- Can also refer to feeling emotionally low or drained.
- Often heard in casual conversation: “I’m feeling a bit under the weather today.”
- Synonymous with “off-colour”, “peaky” or “out of sorts”.
Where does the phrase come from?
The origin likely links to 19th-century maritime language. Sailors who felt seasick or ill would go below deck—literally under the weather—to escape the elements.
- First recorded use appears in a mid-1800s British dictionary.
- Some etymologists connect it to the effect of bad weather on health.
- The phrase is now used globally in English-speaking countries.
How to use “under the weather” in a sentence
It is an idiom, so it stays fixed in form. Examples: “She has been under the weather since Monday.” “I am feeling under the weather, so I’ll stay home.”
Is “under the weather” formal or informal?
It is informal but very common in British English. You would use it with friends, family or colleagues, but not in medical or official documents.
Can you feel under the weather without being sick?
Yes. The phrase can describe tiredness, stress or a low mood that isn’t a diagnosed illness. It’s a broad, everyday expression of feeling less than normal.
What’s a good synonym for “under the weather” in writing?
In more formal writing, use “unwell”, “indisposed” or “ailing”. In casual speech, “rough” or “wiped out” also work. Stick to the idiom for natural conversation.
Sources
For more on how weather affects your day, see our UK weather hub or check the 10 day weather forecast UK. If you’re in the Midlands, our Birmingham Weather page gives local updates.