Weather in June — Sebastian, Florida

Sebastian's June normals at Vero Beach are an 88.9°F high, a 72.2°F low and 6.76 inches of rain, about 2.56 inches more than May as the wet season settles in.

NOAA's 1991 to 2020 normals for the Vero Beach airport station, the record NWS Melbourne uses for Indian River County, set the June mean at 80.6°F (NOAA NCEI monthly normals). June averages 12.2 days at 90°F or hotter, and rain reaches a tenth of an inch on 9.1 days and an inch on 2.4 days. The day to night spread tightens to 16.8 degrees as humid nights hold the lows above 70°F.

June's 102°F reading on June 22, 2009 is the highest temperature on the whole Vero Beach record, which NWS Melbourne lists alongside the all-time low of 21°F in its annual summary for the station south of Sebastian (NWS Melbourne annual climate report for Vero Beach). June rain at the station has ranged from 0.30 inches in 1998 to 20.73 inches in 1992 (NWS Melbourne June 2026 climate report, IEM archive), and the NOAA normals place a quarter of Junes under 4.16 inches and a quarter over 8.17 inches.

June thunderstorms around Sebastian come from the east and west coast sea breezes colliding over the Florida peninsula, the pattern NWS Melbourne's lightning climatology says takes over in June.

The office's climatology describes June as the month when flash rates over the peninsula begin to dominate, driven by the two sea breezes that develop along the east and west coasts (NWS Melbourne lightning climatology). Its strike estimates for Brevard County, which borders Sebastian and Indian River County on the north, jump from about 838 in May to about 4,398 in June (NWS Melbourne lightning statistics).

The same NWS Melbourne lightning statistics count 70 Florida lightning deaths in June across the years in its table, more than double May's 29, and only July and August rank higher. The Vero Beach climate reports show the June pattern in recent years near Sebastian: thunder on 20 days in June 2026 and on 15 days in June 2025 (NWS Melbourne June 2025 climate report, IEM archive).

Storm gusts in Sebastian itself show up first at two local stations: the automated station at Sebastian Municipal Airport (KX26), listed on the NWS forecast page for the city (NWS forecast for Sebastian), and the Florida Institute of Technology station SIPF1 on the north jetty of Sebastian Inlet State Park (NOAA NDBC station SIPF1). The monthly June totals on this page come from Vero Beach, which keeps the long record.

The Atlantic hurricane season opens June 1 and runs to November 30, and the National Hurricane Center notes that the first named storm typically forms in mid to late June, so June is the first tropical month for Sebastian.

The National Hurricane Center's climatology also places the first hurricane of a typical season in early to mid August (National Hurricane Center climatology). On the 1991 to 2020 climate period, an average Atlantic season produces 14 named storms, 7 hurricanes and 3 major hurricanes, the backdrop for every season on the Treasure Coast. June systems that reached Sebastian's area have mostly been tropical storms. NWS Melbourne's report on Tropical Storm Barry, June 1 and 2, 2007, lists 4.15 inches of rain and a 37 knot peak gust at the Vero Beach airport (NWS Melbourne Tropical Storm Barry report).

NWS Melbourne's storm survey list adds Tropical Storm Debby from June 23 to 27, 2012, heavy rain from Tropical Storm Andrea on June 6, 2013, and Tropical Storm Colin on June 6 and 7, 2016. Closest to home, it lists an Indian River County and Sebastian tornado on June 24, 2001, and excessive heat and record temperatures on June 23 and 24, 2022 (NWS Melbourne storm surveys).

For storm updates, the City of Sebastian posts information on any hurricane or tropical storm on its Tropical Weather Information page and lists the local government channels that carry it (City of Sebastian).

June water near Sebastian Inlet averages in the low 80s, with Trident Pier at 82.8°F, the Canaveral buoy at 80.8°F and Lake Worth Pier at 82.7°F on NOAA's monthly averages.

The offshore Canaveral buoy crosses 80°F in June for the first time in the year, a gain of 3.4 degrees from May, and the beach stations north and south of Sebastian Inlet State Park sit within a tenth of a degree of each other (NOAA Coastal Water Temperature Guide). June is also the first month in which the Trident Pier average tops 82°F.

The Indian River Lagoon behind Sebastian keeps warming after June. A Florida Atlantic University study of lagoon water temperatures between Sebastian and St. Lucie inlets places the annual maximum temperatures in July and August (FAU Indian River Lagoon water temperature study), so June lagoon water along the Sebastian riverfront and Wabasso is still short of its yearly peak.

Warm water and nesting season meet on the Sebastian beaches in June. The Sebastian Inlet District reports that Sebastian Inlet State Park conducts park ranger guided sea turtle walks in June and July, with reservations required and benefiting the Friends of Sebastian Inlet State Park (Sebastian Inlet District).

June 2026 at Vero Beach ran close to normal on rain for Sebastian, at 6.79 inches against 6.76, but logged 19 days of 90°F or hotter, while June 2025 logged 21 such days with only 3.64 inches of rain.

At the Vero Beach station, the hottest June 2026 afternoons reached 95°F on June 15 and June 19, and the coolest morning was 67°F on June 8 (June 2026 report). The month's mean of 81.3°F ran 0.7 degrees above normal. The largest one-day total was 2.19 inches on June 2 and 3, and the strongest gust, 41 mph, came on both June 19 and June 21. Skies were classed fair on 27 days.

June 2025 near Sebastian topped out at 94°F on June 8 and bottomed at 69°F on June 17. Its 3.64 inches of rain left it 3.12 inches below normal, and its wettest day brought only 1.30 inches, on June 27. The mean of 80.8°F was 0.2 degrees above normal, and the average relative humidity at Vero Beach was 77 percent, against 75 percent in June 2026.