Weed pollen season UK
Weed pollen season usually runs from June to September, after tree and grass pollen seasons begin.
2026 weed pollen season ends: Wednesday, 30 September 2026
Get a reminder 7 days before Weed pollen season UK
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Upcoming dates
| Event | Date | Countdown | Region / notes |
|---|---|---|---|
| 2026 weed pollen season ends | Wednesday, 30 September 2026 | In 3 months | UK |
| 2027 weed pollen season begins | Tuesday, 1 June 2027 | In 11 months | UK |
Weed pollen is less talked about than grass pollen, but it can keep hay fever symptoms going late into summer. Nettle, mugwort and plantain are common UK triggers. The season usually runs from June to September, overlapping with late grass pollen and mould spores. People who feel worse after grass pollen has eased should check weed pollen and mould spore forecasts.
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Late-season hay fever relief
Verified 14 May 2026
Questions
When is weed pollen season?
It usually runs from June to September in the UK.
Which weeds cause pollen allergy?
Nettle, mugwort and plantain are common UK examples.
Can weed pollen cause late hay fever?
Yes. It can be one reason symptoms continue into late summer.