Barnstable in Summer
In summer (June, July and August), Barnstable sees average daytime highs around 68°F and overnight lows near 65°F, with 8.9 in of rain over about 24 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 60°F in early June to 70°F by late August. The sky is clear or mostly clear about 37% of the time across summer, and the air most often feels humid.
Summer is Barnstable's best season of the year to visit on our travel score. For the whole year in context, see Barnstable's year-round climate.
- Avg daytime high
- 68°F
- warmest season of the year
- Avg overnight low
- 65°F
- Rainfall
- 8.9 in
- 24 wet days
- Avg wind
- 12 mph
- Travel score
- 6.7
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Barnstable in Summer
Over the season highs climb from about 60°F in early June to 70°F by late August.
A typical summer day in Barnstable reaches about 68°F and drops to 65°F overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Barnstable
Once humidity and wind are folded in, summer brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Barnstable 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 | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 38° / 30° | 4.3 | 11.2 | 4.7 | 9.3 | 0.0 |
| Feb | 38° / 30° | 3.8 | 10 | 4.7 | 10.3 | 0.0 |
| Mar | 41° / 34° | 4.8 | 11.2 | 3.7 | 11.7 | 0.1 |
| Apr | 47° / 42° | 4.3 | 11.3 | 0.6 | 13.1 | 1.5 |
| May | 55° / 50° | 3.6 | 10.3 | 0 | 14.3 | 3.5 |
| Jun | 64° / 60° | 3.2 | 8.2 | 0 | 15 | 5.9 |
| Jul | 71° / 67° | 2.5 | 7.7 | 0 | 14.7 | 7.0 |
| Aug | 71° / 67° | 3.1 | 7.8 | 0 | 13.7 | 7.1 |
| Sep | 66° / 62° | 4.0 | 8.3 | 0 | 12.3 | 6.5 |
| Oct | 59° / 54° | 4.8 | 10.1 | 0 | 10.9 | 4.6 |
| Nov | 51° / 44° | 4.4 | 10 | 0.3 | 9.6 | 2.4 |
| Dec | 43° / 36° | 5.1 | 12 | 2.8 | 9 | 0.6 |
Cloud cover in Summer
The sky is clear or mostly clear about 37% of the time across summer.
Chance of precipitation in Summer
Barnstable gets around 8.9 in of rain over 24 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 12 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 48 min in early June to 13 hours 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 6.2 kWh/m².
Hazard calendar for Barnstable
In summer, Barnstable overlaps its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Barnstable sits in the Atlantic hurricane belt; the season peaks August–October.
Is summer a good time to visit Barnstable?
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 Barnstable for sightseeing.
What to pack for Barnstable in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Barnstable sees daytime highs around 68°F and nights near 65°F. Pack sun protection. Worth having: rain gear and a windbreaker. About 24 days see rain.
Sea temperature near Barnstable in Summer
The nearest coast averages about 65°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 August at about 69°F and coldest in February near 37°F.
It's comfortable for a long swim from Aug 5 to Aug 23 — about 0.6 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 40 | 37 | 38 | 44 | 51 | 59 | 67 | 69 | 66 | 59 | 51 | 45 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Cool | Cool | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 40 | Bracing |
| Feb | 37 | Bracing |
| Mar | 38 | Bracing |
| Apr | 44 | Bracing |
| May | 51 | Bracing |
| Jun | 59 | Cool |
| Jul | 67 | Cool |
| Aug | 69 | Refreshing |
| Sep | 66 | Cool |
| Oct | 59 | Cool |
| Nov | 51 | Bracing |
| Dec | 45 | Bracing |
UV index in Barnstable in Summer
Clear-sky midday UV across summer averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Barnstable peaks around June 21 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 23 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 4 | 5 | 7 | 8 | 8 | 5 | 6 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Moderate | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 5 | High |
| May | 7 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 5 | Moderate |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Where is Barnstable?
Barnstable sits at 41.7°N, 70.3°W, 36 ft above sea level, in United States. The nearest listed city is Yarmouth, 3.7 mi away.
Topography around Barnstable
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Barnstable.
Within 2 miles, the terrain around Barnstable has only modest variations in elevation — a maximum elevation change of 171 ft around an average of 56 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 315 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 630 ft.
The land around Barnstable is covered by trees (51%) and water (25%) within 2 miles, water (58%) and trees (32%) within 10 miles, and water (74%) and trees (22%) 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 Barnstable (41.7001°, -70.2995°, elevation 36 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.