Weather in May in South Brevard, Florida

May normals reach 86.6 degrees by day and 65.4 at night at the Palm Bay co-op station and 84.9 over 68.6 at Melbourne International Airport, which averages 4.5 May days of 90 or hotter.

The Palm Bay figures are from cooperative station USC00086761 (ACIS normals, Palm Bay co-op) and the airport figures from the same NOAA 1991 to 2020 set (ACIS normals, KMLB). The inland Palm Bay gauge runs 1.7 degrees hotter in the afternoon than KMLB (86.6 minus 84.9) but 3.2 degrees cooler at dawn (68.6 minus 65.4).

The record row and the 4.5 hot day normal come from the NWS Melbourne May 2026 climate report (KMLB May 2026 climate report). Vero Beach, the official benchmark for Micco and Barefoot Bay, sits between the two Brevard stations at 85.7 and 67.8 (ACIS normals, Vero Beach).

May can be hotter than the summer months that follow. NWS Melbourne notes that the hottest temperatures of the season sometimes come in May or June, before rain becomes frequent, and that, in the study's records, the hottest month at Melbourne was June 1998, in the middle of a prolonged dry spell (NWS Melbourne season study, page 4). The ocean warms too: Trident Pier at Port Canaveral averages 80.2 degrees in May and the Canaveral buoy 77.4 (NOAA NCEI water temperature table), so shore water near the South Brevard beaches is already around 80 before June begins.

The wet season starts on May 28 at Melbourne and May 26 at Vero Beach in a typical year, the median onset dates NWS Melbourne computed from records back to 1950.

Orlando's median is May 27 (NWS Melbourne wet and dry season onset), so Melbourne, Vero Beach and Orlando normally turn wet in the last days of May. Half of all years start earlier and half later; the same table puts the return of the dry season at Melbourne on October 17.

The change is a jump, not a ramp. NWS Melbourne explains that rainfall frequency usually begins to increase in late May, though the start is sometimes delayed into June and, in rare cases, as late as early July, as in 1998 (NWS Melbourne season study, page 1). The airport normals show the jump: Melbourne International Airport averages 3.53 inches in May and 7.10 in June (ACIS normals, KMLB May and June), and the June normal low of 73.1 is 4.5 degrees warmer than May's 68.6.

Lightning follows the same calendar. The NWS Melbourne lightning climatology describes a rapid increase of lightning in May, with most of it from thunderstorms that form along the sea breezes (NWS Melbourne lightning climatology); in Palm Bay and Malabar the storms of late May are the first of that summer pattern.

Normal May rainfall is 4.37 inches at the Palm Bay co-op, 3.53 at Melbourne International Airport and 4.20 at the Vero Beach airport near Micco and Barefoot Bay.

NWS Melbourne notes that the most notable increase in rainfall frequency usually begins late in the month (NWS Melbourne season study). At KMLB, May brings measurable rain on 8.5 days in a normal year and an inch or more on 1.2 (KMLB May rain normals). The extremes are far apart: the wettest May at the airport brought 13.83 inches in 1976, and the driest only 0.17 inch in 1965.

May 2026 ran dry at Melbourne and Vero Beach. Melbourne measured 2.40 inches against its 3.53 normal and Vero Beach 2.53 against 4.20 (NWS Melbourne May 2026 rainfall table), though KMLB counted thunderstorms on 9 days and measurable rain on 11 (KMLB May 2026 report). No May 2026 day at the airport reached an inch, against 1.2 such days in a normal May.

Dry Mays raise fire danger at the worst time. The Florida Forest Service notes that fire activity peaks in May and June (Florida Forest Service KBDI notes), so May in Grant-Valkaria, Malabar and western Palm Bay falls inside the peak fire window until the wet season takes hold.

Yes: May 2026 averaged 80.6 degrees at Melbourne, the warmest May on record there, beating 80.3 from May 2024, and Vero Beach tied its own warmest May at 80.1.

NWS Melbourne reported the ranking in its May 2026 summary (NWS Melbourne May 2026 rankings). The record nights stood out most: Melbourne set a daily warm low record of 80 on May 26, beating 79 from 2015 and the all-time record warm minimum for May at the site, and a daily record high of 97 on May 9, beating 94 from 1978 (NWS Melbourne May 2026 records). The whole spring, March to May, ranked second warmest on record at both Melbourne and Vero Beach (NWS Melbourne Spring 2026 summary).

The 2023 and 2024 rows are from the KMLB report issued June 1, 2024 (KMLB May 2024 report) and the 2025 and 2026 rows from the one issued June 1, 2026 (KMLB May 2026 report). Three of the last four Mays at Melbourne averaged more than 3 degrees above the 76.8 normal, and May 2024, with 14 days of 90 or hotter and only 1.12 inches of rain, peaked at 98 on May 27. In 2026 the heat showed in the nights: the average low of 73.7 was 5.1 degrees above normal (73.7 minus 68.6).

May lightning comes mainly from sea breeze thunderstorms, and the NWS Melbourne event log records damaging May storms at Roseland, Sebastian, Vero Beach and across Brevard.

Early on May 3, 1964 thunderstorm winds unroofed two houses and damaged other homes and commercial buildings at Roseland in Indian River County (NWS Melbourne May event log, 1964). On the night of May 8, 1977 a line of severe thunderstorms moved through St. Lucie, Indian River and Brevard Counties with hail and gusty winds, lightning set a fire at a tire store in Vero Beach, and winds up to 50 mph were measured at Kennedy Space Center (NWS Melbourne May event log, 1977).

On May 30, 1996 thunderstorm winds overturned and destroyed a 20 passenger airplane at the Sebastian Airport and on May 31, 1991 hail from nickel to golf ball size fell in Brevard and four other counties (NWS Melbourne May event log, 1991 and 1996). At Melbourne International Airport the strongest gust of May 2026, 45 mph, came on May 31 (KMLB May 2026 wind).

May is the last month before the Atlantic hurricane season opens on June 1, which makes it the month for households in Palm Bay, Malabar, Grant-Valkaria, Micco and Barefoot Bay to check an evacuation zone and stock storm supplies.

The National Hurricane Center sets the Atlantic season at June 1 to November 30, with a 1991 to 2020 average of 14 named storms, 7 hurricanes and 3 major hurricanes, and a peak on September 10 (National Hurricane Center climatology). The center adds that tropical cyclones sometimes form before and after those dates, so a May checklist for a home in Micco or Barefoot Bay is not early.

Several storm supplies no longer need a tax holiday in Palm Bay or Barefoot Bay. Effective August 1, 2025, items once exempted only during past tax holidays are always exempt from Florida sales tax, among them portable generators capable of producing 10,000 running watts or less, portable gas or diesel fuel cans with a capacity of 5 gallons or less, AA, AAA, C, D, 6 volt and 9 volt batteries, ground anchor systems and tie down kits, and waterproof tarps and sheeting of 1,000 square feet or less (Florida Department of Revenue TIP 25A01-05).

Evacuation zones come next. The Florida Division of Emergency Management's evacuation zone lookup takes an address, such as one in Palm Bay or Barefoot Bay, or a device location, and shows designated evacuation zones, which most coastal Florida counties have and interior counties do not; the same page lists a county evacuation route and zone map for Brevard and states that during an emergency the local emergency management program should always be consulted regarding evacuation orders (Florida Disaster Preparedness Maps). The South Brevard hurricane history guide covers the storms that have struck the region, and the June guide picks up the season itself.