Winchester pollen forecast - today, tomorrow and the week ahead

On 16 July 2026, overall pollen levels in Winchester are low. Grass is the main contributor to airborne pollen

On 17 July 2026, pollen conditions in Winchester will be similar to today, with grass at low levels

According to the five-day outlook, grass, artemisia, and cypress pollen levels will increase later in the week.

On 16 July 2026, Grass is the dominant pollen source in Winchester. willow, alder, artemisia, birch, hazel, and cypress are not currently active.

Ask anyone with allergies in Winchester and they'll tell you it's sycamore and oak that cause the trouble. Grass season overlaps a lot of this too, running May through September and peaking mid-summer. Sycamore gets going around April and tapers off by June, before oak takes over, usually April to May. Something to plan around if pollen usually gets to you.

The Winchester pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.

Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.

Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Winchester, modern forecasts combine recent measurements, weather data, and information about local vegetation.

This allows us to estimate pollen levels for today and the coming days, not just report the past.

Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.