Tree Pollen Count in Siston, United Kingdom

Last updated Sunday, November 8, 2026

This page shows the most recent reading available for Siston — from Sunday, November 8, 2026 (1 day ago) — not today's reading.

This reading is the forecast point shared with Westerleigh, United Kingdom — 2 nearby places use the same point; Siston is 6.5 km from it.

Pollen by type in Siston

What is the tree pollen count in Siston today?

The Siston tree pollen index today is 18 (Low) on Pollen Atlas’s modelled 0–100 scale. Low

Modelled pollen risk index — not a measured count.

Siston’s overall pollen count today is 18 (Low) across all types. See the full Siston pollen count for the overall index and every type together.

Siston is in South Gloucestershire, England, United Kingdom. Its population is 501 (GeoNames).

Siston Tree Pollen Count: 5-Day Forecast

DayOverall indexCategory
Sunday, November 818Low
Monday, November 919Low
Tuesday, November 107Low
Wednesday, November 117Low
Thursday, November 1217Low

Pollen Atlas models the daily detail as an overall index: day-by-day splits by individual pollen type are not part of the modelled data, so this table shows Siston’s overall trend across the week. Today’s tree pollen reading is the headline above.

Species driving Siston’s tree pollen

Species-level counts are not part of the modelled data Pollen Atlas publishes — the modelled index is reported per pollen type, not per species — so this section gives the type summary: tree pollen reads 18 (Low) today. The plant-by-plant detail that is available, from the Google Pollen API, is in the next section.

Plants affecting Siston now — tree pollen

Detailed plant-by-plant readings for the tree pollen category were not returned in today’s source data for Siston. The type summary stands: tree pollen reads 18 (Low) today.

In the Atlantic West pattern, the plants that typically shape this city’s year are early hazel and alder, a spring birch and oak wave, late-spring and summer grasses, and a modest late-summer weed finish — named here as regional context only, not as today’s readings.

Plant detail returns here automatically on any day the feed includes it.

What this tree pollen level means

Low risk. Keep windows open; consider allergy meds only if sensitive.

Enjoy outdoor activities.

Hazel and alder can open as early as February in mild winters, and the main tree wave — birch, then oak — builds through spring to a May peak. This month sits outside the usual tree pollen window for the Atlantic West pattern, so today’s tree pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. No United Kingdom allergy season guide is published yet, so the seasonal context here follows the Atlantic West regional pattern.

Siston allergies today

Siston allergies today are set by the same reading as the Siston pollen count today: the Total Pollen Index is 18 (Low), and the tree pollen index on this page is 18 (Low) of it. When people ask about Siston allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for Siston.

Allergies in Siston follow the United Kingdom calendar set out on the full Siston page — the chapters, the plants behind them, and the 5-day forecast show whether today is typical for the season or an exception to it. If you are checking allergies today in Siston before heading outdoors, the tree pollen split on this page is the part to read: it shows whether this pollen type is doing the work today, not just how high the total sits.

Read the five-day overall trend above as the Siston allergy forecast for the tree pollen season: it shows whether Siston allergies are set to ease or build across the week, day by day — the days to plan outdoor time around are the ones where the overall index steps down, not just today.

See the full Siston pollen count — all types, the overall index and today’s ranking context

Siston grass pollen count

Siston ragweed pollen count

See how Siston ranks in today's pollen count rankings — the worst cities for allergies today

See Siston on the pollen map

Every pollen type, with photos and seasons: the pollen directory

Worst cities for allergies

Tree pollen season

Find an allergist in Siston, United Kingdom

Pollen indexes: a modelled pollen risk index computed by Pollen Atlas from open weather, vegetation and phenology data, calibrated against CDC/NAB season data. Plant detail: Google Pollen API. Index values are modelled, not measured counts. Sources: CDC/NAB; USA-NPN; GBIF (CC BY); ESA WorldCover (CC BY 4.0).