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Pollen and hay fever: season and precautions
April to August.
These are general seasonal patterns for the Nordic and Baltic region, not a live forecast. Always check the current local advisory — the weather service, health authority or water-quality notice — before you head out.
The risk
The northern pollen season is compressed and intense. Birch pollen in spring is a particularly powerful allergen across the Baltics and Nordics, followed by grass pollen in early summer and weed pollen later. For sensitive people it brings a blocked and runny nose, itchy eyes and sneezing, and it can trigger asthma.
How to stay safe
Check the daily pollen forecast and plan outdoor exertion for lower-count times, often after rain. Antihistamines and steroid nasal sprays work best when started before the season peaks rather than once symptoms are bad. Keep windows shut on high-pollen days, and shower and change clothes after being outside to wash pollen out of hair and off skin.
Good to know
People with asthma should keep their reliever inhaler close during their trigger season.
Other seasonal risks
Ticks (Lyme disease and TBE)
Ticks wait on grass and low vegetation in forests, meadows and gardens and attach to skin as you brush past.
Mosquitoes
Mosquitoes breed in still water and are at their fiercest around bogs, lakes and wet forest, particularly in the long northern twilight.
Forest and wildfire risk
After a run of dry days the forest floor, heath and peat dry out and ignite easily.
Blue-green algae (cyanobacteria)
In warm, still water, cyanobacteria can multiply into a bloom that looks like spilled paint, greenish streaks or a scummy film on the surface.
Thin ice
Ice on lakes, rivers and the sea forms and melts unevenly.
Source: Seasonal patterns follow standard public-health and safety guidance for the region; confirm with the current local advisory. · checked 2026-09-04
Frequently asked questions
When is pollen and hay fever worst?
Birch in April–May, grasses in June–July, mugwort in August.
How do I reduce the risk from pollen and hay fever?
Check the daily pollen forecast and plan outdoor exertion for lower-count times, often after rain.
Enjoy the outdoors year round
TempoLife helps you keep an outdoor habit going safely through every season.