Guelph pollen forecast — Hamilton Corner neighborhood

On 30 August 2026, overall pollen levels in Guelph are moderate. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels

On 31 August 2026, pollen conditions in Guelph will be different from today, with artemisia at low levels and ambrosia, grass increasing

According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, while ambrosia and grass pollen will increase, suggesting mixed conditions later in the week.

On 30 August 2026, Ambrosia is the dominant pollen source in Guelph. grass are also present but at lower levels. artemisia and cypress are not currently active.

Water-edge hazel and willow are usually the first allergenic trees active here, usually peaking sometime between late winter and the end of March. Oak and birch in the woods pick up where the earlier species leave off, topping out in the April-to-May stretch. By late spring, grass pollen is climbing steadily toward a June high point, before ragweed takes over as the dominant allergen from mid-August through October.

The Guelph 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 Guelph, 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.