Skip to content

Pollen forecast

We produce and supply the pollen forecasts for the UK in conjunction with the Met Office.

Summary and Weekly Synopsis

During warm dry weather the weed pollen risk will be moderate. Fungal spores will be high during warm conditions especially when humid..

This forecast was last updated on 26 August 2016.

Tree Pollen - Low

The tree pollen risk is now low again.

Grass Pollen - Low

The risk from grass pollen is now down to low with just the odd sneeze or sniffle likely at times.


Fungal Spore - High

Warm humid nights will allow a high risk from Didymella Tilletiopsis and Sporobolomyces.  Good weather will allow Cladosporium and Alternaria to increase to high levels. Ganoderma (basidiospores) will be prevalent too, triggering a range of respiratory problems including asthma.

For more information on fungal spore allergy click here


Weed Pollen - Moderate

During periods of warm dry weather there will be a generally moderate risk from weed pollen including nettle pellitory-of-the-wall mugwort and fat hen. The risk should decline as we head into September. It is the lowland agricultural regions that are largely affected by weed pollen. Pellitory-of-the-wall is most prevalent in eastern parts of the UK particulary urban areas. Weed pollen types affect around 20% of the UK's hay fever sufferers.

Other information

Oilseed rape (Brassica napus) pollen can cause hay fever in a small number of sufferers but Volatile Organic Compounds (VOCs) given off by the crop can cause irritation of the upper respiratory tract and eyes in some people in close proximity to the crop.

Further Information

Further information on this service can be obtained from Beverley Adams-Groom on 01905 855411.

Forecasts are available on a regional basis to cover the whole of the UK including Northern Ireland. They can also be provided in detail for individual regions.

Daily forecasts are issued from the middle of March to the end of September. Tree pollen forecasts are issued in late spring (late March to Mid May). Grass pollen forecasts are issued from late May to August. Weed pollen forecasts are issued from July to the end of May. Fungal spore forecasts are available from the University of Worcester from September to early November. Please contact Beverley on the number above for details.

Daily forecasts are featured in newspapers, on radio, on television and various web pages.

All the forecasts are based on information from the quality controlled data produced by the National Pollen Monitoring Network, combined with the information from weather forecasts, local vegetation and typography types and information about biological factors and the weather in the preseason period that influences the amount of pollen produced.