Pollen Forecast Ottawa

Compare daily tree, grass and weed pollen forecasts for central Ottawa. The 0–5 Universal Pollen Index describes forecast pollen levels; it is not a real-time measurement of pollen grains. Each table shows its actual forecast dates and when we retrieved the data.

Ottawa pollen forecast summary

Ottawa forecast for November 2, 2026: tree index unavailable; grass index unavailable; weed index unavailable.

Forecast dates: November 2, 2026 to November 6, 2026. Retrieved from Google: Nov 2, 2026, 11:05 a.m. EST.

The retrieval time is when we received the forecast, not a live observation time. Read the dates shown before planning an activity; a previously retrieved forecast may be shown when an update is unavailable.

Google Maps · Source: Includes pollen data from Google

🌳 Tree pollen

Index not available

🌾 Grass pollen

Index not available

🌿 Weed pollen

Index not available

Pollen by plant

🌳 Alder

Index not available

🌿 Birch

Index not available

🌾 Grass

Index not available

🌱 Mugwort

Index not available

🌿 Ragweed

Index not available

Daily forecast (up to 5 days)

0 is a reported UPI of None. Out of season and unavailable indices are shown separately; neither is replaced with zero. Only available provider indices contribute to the summary.

Daily pollen type and plant forecasts on the Universal Pollen Index (0–5)
Type or plant	Nov 2	Nov 3	Nov 4	Nov 5	Nov 6
🌳 Tree (type)	Unavailable	Unavailable	Unavailable	Unavailable	Unavailable
🌾 Grass (type)	Unavailable	Unavailable	Unavailable	Unavailable	Unavailable
🌿 Weed (type)	Unavailable	Unavailable	Unavailable	Unavailable	Unavailable
🌳 Alder	Unavailable	Unavailable	Unavailable	Unavailable	Unavailable
🌿 Birch	Unavailable	Unavailable	Unavailable	Unavailable	Unavailable
🌾 Grass	Unavailable	Unavailable	Unavailable	Unavailable	Unavailable
🌱 Mugwort	Unavailable	Unavailable	Unavailable	Unavailable	Unavailable
🌿 Ragweed	Unavailable	Unavailable	Unavailable	Unavailable	Unavailable

How to read the Universal Pollen Index

Google's Universal Pollen Index (UPI) is a modelled daily forecast on a 0–5 scale. It is not a live pollen-grain count. This forecast uses central Ottawa coordinates (45.4215, −75.6972); conditions can vary by location.

UPI 0: None
UPI 1: Very Low
UPI 2: Low
UPI 3: Moderate
UPI 4: High
UPI 5: Very High

Google's UPI methodology · Forecast and season-status documentation

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Ottawa Pollen Season Calendar

These broad seasonal patterns provide context for planning in Ottawa. They are general Ontario guidance, not a prediction of this year's local peaks. The dated forecast above takes precedence when checking current conditions.

General Ontario seasonal pollen patterns
Pollen	General seasonal pattern
Tree	Spring, sometimes extending into early summer
Grass	Late spring through summer
Ragweed	Late summer into fall, until frost

Source: Allergy, Asthma and Immunology Society of Ontario, Rhinitis (Hay Fever).

About this forecast

Tree, grass and weed are Google's three pollen types. The plant rows highlight alder, birch, grasses, mugwort and ragweed where the provider supplies data. Availability varies by location and season, so a missing plant index is not evidence that the pollen is absent.

We check for a new forecast up to every three hours. Google provides daily forecasts for up to five days; the time we retrieve a response does not change the dates that response covers.Read Google's forecast documentation.