Merritt Island in Summer
In summer (June, July and August), Merritt Island sees average daytime highs around 85°F and overnight lows near 77°F, with 14.5 in of rain over about 60 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 85°F. The sky is clear or mostly clear about 25% of the time across summer, and the air most often feels oppressive.
Summer is Merritt Island's weakest season of the year to visit on our travel score. For the whole year in context, see Merritt Island's year-round climate.
- Avg daytime high
- 85°F
- warmest season of the year
- Avg overnight low
- 77°F
- Rainfall
- 14.5 in
- 60 wet days
- Avg wind
- 7 mph
- Travel score
- 4.1
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Merritt Island in Summer
Across summer, daytime highs hold fairly steady around 85°F.
A typical summer day in Merritt Island reaches about 85°F and drops to 77°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Merritt Island
Once humidity and wind are folded in, summer brings about 79 days that feel above 90°F and 0 that feel at or below 32°F.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Merritt Island weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 69° / 58° | 2.3 | 6.9 | 10.4 | 6.9 |
| Feb | 70° / 60° | 2.0 | 6.8 | 11 | 7.0 |
| Mar | 73° / 63° | 2.4 | 6.6 | 11.8 | 7.5 |
| Apr | 77° / 67° | 1.9 | 6.8 | 12.7 | 7.6 |
| May | 81° / 72° | 2.7 | 9.3 | 13.4 | 6.8 |
| Jun | 84° / 76° | 4.9 | 18.3 | 13.8 | 4.5 |
| Jul | 85° / 77° | 4.3 | 19.8 | 13.6 | 4.0 |
| Aug | 85° / 78° | 5.3 | 21.5 | 13 | 3.8 |
| Sep | 83° / 77° | 6.0 | 19.8 | 12.2 | 4.4 |
| Oct | 80° / 73° | 3.7 | 12.1 | 11.3 | 6.4 |
| Nov | 75° / 66° | 1.8 | 7.5 | 10.6 | 7.4 |
| Dec | 71° / 62° | 1.9 | 6.5 | 10.2 | 7.1 |
Cloud cover in Summer
The sky is clear or mostly clear about 25% of the time across summer.
Chance of precipitation in Summer
Merritt Island gets around 14.5 in of rain over 60 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 42 min in early June to 12 h 36 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.9 kWh/m².
Hazard calendar for Merritt Island
In summer, Merritt Island overlaps its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.
Merritt Island sits in the Atlantic hurricane belt; the season peaks August–October.
Merritt Island's rainy season runs June–October, when most of the year's rain falls.
Is summer a good time to visit Merritt Island?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Merritt Island for sightseeing.
What to pack for Merritt Island in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Merritt Island sees daytime highs around 85°F and nights near 77°F. Pack light clothes, rain gear and sun protection. About 60 days see rain.
Sea temperature near Merritt Island in Summer
The nearest coast averages about 81°F across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 19 mi away) is warmest in September at about 82°F and coldest in February near 67°F.
It's comfortable for a long swim from Mar 2 to Jan 31 — about 11 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 69 | 67 | 69 | 72 | 76 | 80 | 81 | 82 | 82 | 80 | 74 | 71 |
| Comfort | Refreshing | Cool | Refreshing | Refreshing | Warm | Warm | Warm | Warm | Tropical | Warm | Refreshing | Refreshing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 69 | Refreshing |
| Feb | 67 | Cool |
| Mar | 69 | Refreshing |
| Apr | 72 | Refreshing |
| May | 76 | Warm |
| Jun | 80 | Warm |
| Jul | 81 | Warm |
| Aug | 82 | Warm |
| Sep | 82 | Tropical |
| Oct | 80 | Warm |
| Nov | 74 | Refreshing |
| Dec | 71 | Refreshing |
UV index in Merritt Island in Summer
Clear-sky midday UV across summer averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Merritt Island peaks around July 16 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 4 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 5 | 6 | 8 | 8 | 9 | 10 | 11 | 10 | 9 | 7 | 5 | 4 |
| Level | Moderate | High | Very high | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | Moderate |
| Feb | 6 | High |
| Mar | 8 | Very high |
| Apr | 8 | Very high |
| May | 9 | Very high |
| Jun | 10 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 9 | Very high |
| Oct | 7 | High |
| Nov | 5 | High |
| Dec | 4 | Moderate |
Air quality in Merritt Island in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Merritt Island is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (December, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 11 | 15 | 13 | 13 | 19 | 19 | 16 | 11 | 9 | 8 | 7 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 11 | Good |
| Mar | 15 | Moderate |
| Apr | 13 | Moderate |
| May | 13 | Moderate |
| Jun | 19 | Moderate |
| Jul | 19 | Moderate |
| Aug | 16 | Moderate |
| Sep | 11 | Good |
| Oct | 9 | Good |
| Nov | 8 | Good |
| Dec | 7 | Good |
Where is Merritt Island?
Merritt Island sits at 28.4°N, 80.7°W, 3 ft above sea level, in United States. The nearest listed city is Rockledge, 2.5 mi away.
Topography around Merritt Island
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Merritt Island.
Within 2 miles, the terrain around Merritt Island has only modest variations in elevation — a maximum elevation change of 39 ft around an average of 7 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 157 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 246 ft.
The land around Merritt Island is covered by water (42%) and artificial surfaces (30%) within 2 miles, water (46%) and trees (25%) within 10 miles, and water (39%) and trees (33%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Merritt Island (28.359°, -80.69°, elevation 3 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.