Colac pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Colac is low; acacia, cypress, eucalyptus, and grass are low.
Pollen Tomorrow
Tomorrow (21 September 2026) acacia no longer expected, cypress no longer expected, eucalyptus no longer expected, grass no longer expected.
7-Day Trend
Over the next week acacia, cypress, eucalyptus, and grass will increase.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Acacia (Acacia) | Low | 10/100 |
| Cypress (Cupressaceae) | Low | 16/100 |
| Eucalyptus (Myrtaceae) | Low | 14/100 |
| Grass (Poaceae) | Low | 5/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Acacia (Acacia) | None | 0/100 | |
| Cypress (Cupressaceae) | None | 0/100 | |
| Eucalyptus (Myrtaceae) | None | 0/100 | |
| Grass (Poaceae) | None | 0/100 |
Local Environmental Conditions
Colac, on the shores of Lake Colac, sits within Victoria's Western District dairy and grazing country, with pasture dominating the surrounding landscape alongside remnant eucalypt woodland and wattle, plus wetland vegetation around the lake itself. The nearby Otway Ranges add a further band of taller native forest to the district's south. Wetland reserves around the lake margins preserve a further pocket of native aquatic and fringing vegetation.
Colac's pollen season runs from August through January, with tree pollen from eucalypts and wattle peaking in August and September and rye grass pollen from October to December, a significant factor here given the extensive dairy pasture surrounding the town in Victoria's Western District, bringing an elevated thunderstorm asthma risk during spring storms, particularly on warm, windy days. Cooler, moister conditions typical of the Western District compared with Melbourne can extend pasture grass flowering into early summer.
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Frequently Asked Questions About Pollen in Victoria
Is pollen high in Colac right now?
On 20 September 2026, overall pollen levels in Colac are low. Acacia is the main contributor to airborne pollen, while cypress, myrtle, and grass remain at lower levels
Will pollen levels change in Colac tomorrow?
On 21 September 2026, pollen conditions in Colac will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Colac this week?
According to the five-day outlook, acacia, cypress, myrtle, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Colac?
On 20 September 2026, Acacia is the dominant pollen source in Colac. cypress, myrtle, and grass are also present but at lower levels.
When is pollen season in Colac?
How often is the Colac pollen forecast updated?
The Colac pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Colac come from nearby or far away?
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.
Are pollen levels in Colac based on measurements or forecasts?
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 Colac, 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.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
