Ragweed is very low in Columbia today.

No mold level

Google’s index covers tree, grass and weed pollen only, so there is no mold level for Columbia on this page. The National Allergy Bureau publishes pollen and mold counts measured at its stations. Our guides cover common molds such as Alternaria, Cladosporium and Aspergillus.

No indoor allergens

The forecast doesn’t cover allergens indoors either: dust mites, cockroaches, mice, cats and dogs. Our guides explain each one, starting with dust mites and cats.

Asthma in Columbia

An estimated 10.2% of adults in the city of Columbia have current asthma, according to the CDC’s PLACES estimate for 2023 (95% confidence interval: 9.1% to 11.3%). It is a statistical estimate from national survey data, not a count.

Allergists in the Columbia area

8 allergists enrolled in Medicare practice in the Columbia area: 0.91 for every 100,000 people, fewer than the 1.22 across the US. The count doesn’t show how soon you can get an appointment. See the doctors listed in the Columbia area, or how every state and metro compares.

AllergyNest count from CMS’s Doctors and Clinicians file (October 2026) and Census population estimates for 2025.

July temperatures in South Carolina average from 76 °F in the northwest to 82 °F in the Midlands and the coastal Lowcountry.² The Midlands get about 45 to 50 inches of precipitation in an average year, though Wateree, in the Midlands, is the driest part of the state at less than 39 inches.² At Columbia’s weather station, summers average about 81 °F, and a typical year has about 229 days between the last spring freeze and the first fall freeze.¹

Congaree National Park lies about 30 minutes from Columbia Metropolitan Airport.³ Much of the park is bottomland that floodwaters from the Congaree and Wateree rivers regularly cover, and its floodplain holds giant old-growth oaks and massive loblolly pines, with bald cypress and tupelo trees in its forested wetlands.⁴ Clemson Extension says most of the yellow-green dust on cars, mailboxes and outdoor furniture from late March through April comes from pine trees.⁵

Common and giant ragweed both occur in South Carolina, and common ragweed appears to be the more prevalent of the two.⁶ The plants rely on vast amounts of pollen blown by the wind to female flowers on nearby plants.⁶ Clemson Extension says the ragweeds share their bloom time with the state’s goldenrods, which typically start in mid-to-late August and often last into early October.⁶