Roseville pollen forecast - today, tomorrow and the week ahead

Currently, there is no significant pollen in Roseville.

On 17 July 2026, pollen conditions in Roseville will be similar to today with no significant pollen expected.

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

On 16 July 2026, there are no significant pollen types in Roseville.

Roseville's pollen season opens with oak and walnut from late January in the mild Sacramento Valley climate. Ash follows through February and March, with grass peaking strongly through April and May. The flat, open valley landscape and surrounding Sierra Nevada foothills contribute substantial grass and tree pollen, while the Dry Creek corridor adds additional local exposure. The hot, dry summer largely suppresses mid-season pollen.

The Roseville 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 Roseville, 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.