St. Lucie County sits at the heart of Florida's humid subtropical zone. Warm Atlantic waters, the Gulf Stream, and a pronounced wet-dry cycle shape a climate that rewards those who understand its rhythms. Explore the data, the patterns, and the science behind Treasure Coast weather.
Long-form guides covering every dimension of Treasure Coast climate, from monthly temperature normals to the best travel windows for visitors.
Humid subtropical classification, wet and dry seasons, Gulf Stream influence, sea breeze convection, frost events, and climate change considerations for St. Lucie County.
A month-by-month breakdown of temperatures, rainfall, humidity, crowd levels, and the best activities for every season of the year.
Roughly 36 of the region's 52 annual inches of rain fall between May and October. Afternoon sea breeze thunderstorms are a near-daily occurrence during peak summer. Humidity runs 75–85%, and temperatures regularly reach the low 90s. This is also hurricane season, with peak activity from August through October.
November through April brings lower humidity, minimal rainfall, and daytime highs in the comfortable 70s and low 80s. Frontal passages from the north can briefly push overnight lows into the 40s and 50s. This is the peak tourist and fishing season, with abundant sunshine and ideal outdoor conditions.
Official 30-year climate averages for temperature, precipitation, and other variables from NOAA's National Centers for Environmental Information.
The local National Weather Service office that issues forecasts, warnings, and climate records for St. Lucie County and the Treasure Coast.
How the subtropical climate drives the unique ecology of the Indian River Lagoon, coastal dunes, and inland flatwoods of St. Lucie County.
The geological foundations beneath the Treasure Coast, from ancient coral reefs to the Anastasia Formation that shapes the coastline.