Semarang pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Semarang is low; cypress and willow are low.
Pollen Tomorrow
Tomorrow (21 September 2026) willow remains low, cypress no longer expected.
7-Day Trend
Over the next week cypress will increase; willow will decrease; grass and goosefoot will remain stable.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | Low | 3/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 8/100 |
| Goosefoot (Amaranthaceae) | None | 0/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 6/100 | |
| Goosefoot (Amaranthaceae) | None | 0/100 |
Local Environmental Conditions
Semarang commands the Central Java northern coast as the provincial capital, where introduced urban trees, tropical grasses, and coastal vegetation introduced urban trees and coastal vegetation account for most of the pollen here, present throughout the year in this equatorial setting. Only the wet season brings the area's Jawa Tengah rainfall patterns into play as a reliable interruption.
Semarang sees no real off-season for introduced urban trees and coastal vegetation pollen given its equatorial position, though rain during October to April interrupts counts more often than the rest of the year. Urban green space and roadside vegetation both contribute steadily through the year.
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Frequently Asked Questions About Pollen in Jawa Tengah
Is pollen high in Semarang right now?
On 20 September 2026, overall pollen levels in Semarang are low. Cypress is the main contributor to airborne pollen, while willow remain at lower levels
Will pollen levels change in Semarang tomorrow?
On 21 September 2026, pollen conditions in Semarang will be different from today, with willow at low levels
Is pollen expected to decrease in Semarang this week?
According to the five-day outlook, willow pollen levels are expected to gradually decrease, while cypress pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Semarang?
On 20 September 2026, Cypress is the dominant pollen source in Semarang. willow are also present but at lower levels. amaranthaceae and grass are not currently active.
When is pollen season in Semarang?
How often is the Semarang pollen forecast updated?
The Semarang pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Semarang 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 Semarang 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 Semarang, 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).
