Sebastian in Summer
In summer (June, July and August), Sebastian sees average daytime highs around 89°F and overnight lows near 76°F, with 21.1 in of rain over about 70 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 89°F. The sky is clear or mostly clear about 18% of the time across summer, and the air most often feels oppressive.
Summer is Sebastian's weakest season of the year to visit on our travel score. For the whole year in context, see Sebastian's year-round climate.
- Avg daytime high
- 89°F
- warmest season of the year
- Avg overnight low
- 76°F
- Rainfall
- 21.1 in
- 70 wet days
- Avg wind
- 5 mph
- Travel score
- 2.9
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Sebastian in Summer
Across summer, daytime highs hold fairly steady around 89°F.
A typical summer day in Sebastian reaches about 89°F and drops to 76°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Sebastian
Once humidity and wind are folded in, summer brings about 92 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.
Sebastian 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 | 72° / 57° | 2.0 | 6.9 | 10.4 | 7.2 |
| Feb | 74° / 58° | 1.7 | 7 | 11 | 7.4 |
| Mar | 78° / 62° | 2.2 | 7.6 | 11.8 | 7.3 |
| Apr | 82° / 67° | 2.1 | 7.7 | 12.6 | 6.6 |
| May | 85° / 72° | 3.2 | 11.3 | 13.4 | 5.1 |
| Jun | 88° / 75° | 7.2 | 21.4 | 13.7 | 3.2 |
| Jul | 89° / 77° | 6.7 | 23.2 | 13.6 | 2.8 |
| Aug | 89° / 77° | 7.2 | 24.9 | 13 | 2.7 |
| Sep | 87° / 76° | 6.2 | 21.4 | 12.2 | 3.4 |
| Oct | 83° / 72° | 3.7 | 12.7 | 11.3 | 5.5 |
| Nov | 78° / 65° | 1.6 | 7.5 | 10.6 | 7.2 |
| Dec | 74° / 60° | 1.5 | 5.6 | 10.3 | 7.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 18% of the time across summer.
Chance of precipitation in Summer
Sebastian gets around 21.1 in of rain over 70 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 5 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 36 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 6.0 kWh/m².
Hazard calendar for Sebastian
In summer, Sebastian overlaps its atlantic hurricane and monsoon season. The full year is below, with each hazard's peak months called out.
Sebastian sits in the Atlantic hurricane belt; the season peaks August–October.
Sebastian's monsoon runs June–October, when most of the year's rain falls.
Is summer a good time to visit Sebastian?
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 weaker month for outdoor sightseeing in Sebastian.
What to pack for Sebastian in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Sebastian sees daytime highs around 89°F and nights near 76°F. Pack light clothes, rain gear and sun protection. About 70 days see rain.
Sea temperature near Sebastian 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 offshore is warmest in September at about 83°F and coldest in February near 70°F.
The water stays above 68°F all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 70 | 70 | 71 | 74 | 77 | 80 | 82 | 82 | 83 | 81 | 76 | 73 |
| Comfort | Refreshing | Refreshing | Refreshing | Refreshing | Warm | Warm | Warm | Warm | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 70 | Refreshing |
| Feb | 70 | Refreshing |
| Mar | 71 | Refreshing |
| Apr | 74 | Refreshing |
| May | 77 | Warm |
| Jun | 80 | Warm |
| Jul | 82 | Warm |
| Aug | 82 | Warm |
| Sep | 83 | Tropical |
| Oct | 81 | Warm |
| Nov | 76 | Warm |
| Dec | 73 | Refreshing |
UV index in Sebastian in Summer
Clear-sky midday UV across summer averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Sebastian peaks around July 14 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 | 7 | 9 | 8 | 10 | 11 | 11 | 10 | 9 | 7 | 5 | 4 |
| Level | Moderate | High | Very high | Very high | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | Moderate |
| Feb | 7 | High |
| Mar | 9 | Very high |
| Apr | 8 | Very high |
| May | 10 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 9 | Very high |
| Oct | 7 | Very high |
| Nov | 5 | High |
| Dec | 4 | Moderate |
Air quality in Sebastian 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 Sebastian is worst in July — around 17 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (December, 6 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) | 6 | 7 | 9 | 10 | 10 | 14 | 17 | 15 | 10 | 8 | 6 | 6 |
| Level | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 7 | Good |
| Mar | 9 | Good |
| Apr | 10 | Good |
| May | 10 | Good |
| Jun | 14 | Moderate |
| Jul | 17 | Moderate |
| Aug | 15 | Moderate |
| Sep | 10 | Good |
| Oct | 8 | Good |
| Nov | 6 | Good |
| Dec | 6 | Good |
Where is Sebastian?
Sebastian sits at 27.8°N, 80.5°W, 20 ft above sea level, in United States. The nearest listed city is Vero Beach, 13 mi away.
Topography around Sebastian
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Sebastian.
Within 2 miles, the terrain around Sebastian has only modest variations in elevation — a maximum elevation change of 43 ft around an average of 13 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 82 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 246 ft.
The land around Sebastian is covered by water (44%) and trees (28%) within 2 miles, water (45%), trees (28%) and grassland (21%) within 10 miles, and water (37%), grassland (32%) and trees (25%) 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 Sebastian (27.8164°, -80.4706°, elevation 20 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.