Port St. Lucie averages 36.1 days a year above 90°F, with September the wettest month at 9.22 in of normal rain. The hottest day on record was 100°F on Aug 11, 2023; the coldest, 28°F on Feb 2, 2026. The single biggest 24-hour rain event recorded was 8.22 in on Jun 7, 2022.
Climate and Average Weather Year Round in Port St. Lucie
Year-round temperature
In Port St. Lucie, the warmest months are June through September, with average daily highs between 87°F and 89°F. The coldest stretch runs December through February, with highs between 73°F and 75°F and overnight lows reaching 57°F.
Rainfall through the year
Rainfall in Port St. Lucie averages 4.9 in per month over the long run. September is the wettest at 9.2 in, while February is the driest at 2.6 in.
Days at 90 °F or hotter
Port St. Lucie averages 36.1 days per year at 90 °F or hotter. The hottest year on record saw 65 such days (2023); the coolest just 5 (2015).
Precipitation this year
As of May 28, Port St. Lucie has received 11.4 in of precipitation this year — 30% below the long-term normal for this point in the year (16.4 in).