Pollen Level
Loading
Fetching live data
Loading city data
Current Conditions
Air Quality
Loading
Fetching live data
Weather
Loading
Fetching live data
Checking today's conditions
Gathering pollen, air quality, and weather data for you.
Loading city data
Pollen Level
Loading
Fetching live data
Air Quality
Loading
Fetching live data
Weather
Loading
Fetching live data
Gathering pollen, air quality, and weather data for you.
Gathering pollen, air quality, and weather data for you.
Pollen Level
Loading
Fetching live data
Air Quality
Loading
Fetching live data
Weather
Loading
Fetching live data
St. Louis's allergy season is compressed but intense, running from April through October. The flat, agricultural landscape around St. Louis, MO produces significant grass and ragweed pollen during peak months.
Right now: August kicks off ragweed season in St. Louis. The Midwest is the US ragweed belt — counts can be extreme.
Spring
Apr – May
Tree pollen season is short but intense — oak, elm, and ash dominate.
Summer
May – Jul
Grass pollen peaks in June. Agricultural regions see elevated counts.
Fall
Aug – Oct
Ragweed is the dominant allergen. The Midwest is a major ragweed zone.
The flat terrain near St. Louis allows pollen to travel long distances on the wind. Cold fronts can temporarily drop counts, but warm spells bring rapid pollen surges. PollenTracker monitors these daily shifts.
Open another nearby forecast without going back to the map.
YES
Tree pollen is moderate with calm conditions. Most people can head out comfortably.
Air quality: AQI is 49 (good).
Best hours: 11:00-13:00
Weather
70°F
Sunny · 93% humidity · 7 mph wind
Google UPI 0/5