Pollen forecast

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

Summary and Weekly Synopsis

A moderate grass pollen risk during warm dry weather. There will also be a moderate risk from weeds and some tree pollen and a high to very high spore risk.

This forecast was last updated on 18th July 2014.

Tree Pollen - Moderate

Sweet chestnut trees are now flowering and there will be a moderate risk in areas where these are located (mainly southern and central UK). There may still be some lime trees in flower but the risk will generally be low.


Grass Pollen - Moderate

The grass pollen season is now in decline and only moderate counts now likely during any warm dry weather with the lowest risk being the south-east and central regions.







Fungal Spore - Very High

We are now in the peak period for fungal spores and the risk will often be high or very high during warm dry weather and during mild humid nights. Alternaria Cladosporium Sporobolomyces Tilletiopsis and Didymella will be the most important allergenic types airborne.






Weed Pollen - High

There will be a continued risk from allergenic weeds over the next week. The main types airborne will be nettle plantain and fat hen (Chenopodium).




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 also available on a daily basis from September to the end of November.

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.