The Sebastian plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
Partly cloudy
Sunny; warmer
Partly cloudy
Chance of showers
Storms likely
Showers likely
Chance of showers
90° on Nov. 12, 2002, the hottest reading for this week of the year since 1942. Next is 89° in 1979.
Sebastian’s center stands about 30 ft above sea level. Within three miles the land runs from 0 ft to 40 ft, a difference of 40 ft: nearly flat ground. Open water lies within three miles.
Under the town center the state geologic map shows Anastasia Formation (sand, limestone), from the Pleistocene, less than 2.6 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, limestone. Age: Pleistocene, less than 2.6 million years old. About 18 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Sebastian reaches the Atlantic Ocean by way of the South Prong Saint Sebastian and the Saint Sebastian: about 14 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sebastian; river miles along the main stem, rounded.
Sebastian has a humid subtropical climate. Summer afternoons average 91° in August; winter nights fall to about 52° in January. About 53 inches of rain fall in a normal year.
On November 14 Sebastian normally reaches 79° and falls to 62°. The record high is 85°, in 2018; the record low 40°, in 1975. The most rain on this date, 3.68 in, fell in 1954.
Normals 1991–2020 and records since 1942 from the Vero Beach Area threaded record (Vero Beach International Airport, 10 miles south-southeast). NOAA, through RCC-ACIS.
