Climate in Sebastian
Sebastian shares the Treasure Coast's humid subtropical climate -- mild winters, hot humid summers, a hurricane season running half the year -- shaped locally by its position at the confluence of the St. Sebastian River and the Indian River Lagoon. A Sebastian-specific climate-station pull was not completed this research pass; the figures below use the closest reliable proxy, the same regional data verified for neighboring Vero Beach and Port St. Lucie.
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Learn moreThe regional temperature and rainfall pattern
Climate-station data for the immediately adjacent Vero Beach market (about 15 miles south, in the same county) and Port St. Lucie shows average annual temperatures in the upper 60s to 70°F, ranging from the mid-50s to mid-60s°F in winter up to the low-to-mid 90s°F in summer, with essentially no snow, and annual rainfall in the mid-50s inches concentrated heavily May through October. Sebastian, at a comparable latitude just north of Vero Beach, should be expected to track this same pattern closely.
The lagoon and river shape local weather more than the ocean does
Because Sebastian sits on the mainland at the St. Sebastian River/Indian River Lagoon confluence rather than directly on the Atlantic, local weather is shaped more by that estuarine geography than by direct ocean exposure -- a real distinction from barrier-island towns, though it doesn't meaningfully change the underlying seasonal temperature or rainfall pattern described above.
Hurricane season remains the defining seasonal risk
Atlantic hurricane season runs June through November, peaking August through October -- directly overlapping the wettest stretch of the year across the Treasure Coast. See the taxes-insurance topic for what that exposure means for insurance costs today.
Key takeaways
- A Sebastian-specific climate-station figure was not independently pulled this session; the estimates here use the verified regional pattern from neighboring Vero Beach and Port St. Lucie as the closest reliable proxy.
- Average annual temperatures likely run in the upper 60s to 70°F with mild winters and hot, humid summers reaching the low-to-mid 90s°F.
- Annual rainfall likely runs in the mid-50s inches, concentrated May through October.
- Sebastian's lagoon/river-confluence geography shapes local weather more than direct ocean exposure, though the underlying seasonal pattern matches the regional norm.
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