Monthly climate averages for Barnstable, United States. Based on 10-year ERA5 reanalysis data.
Cfa Humid Subtropical
Climate OverviewBarnstable, United States in August has warm conditions, with highs averaging 23.9°C (75°F). Sea temperature reaches 25°C (77°F).
This month falls at the end of Summer.
Temperatures remain fairly steady throughout August, with daily highs around 24°C (75°F).
August sees fairly even rainfall, totalling about 65 mm across the month.
Expect around 11.7h of sunshine at the start of August, decreasing to 10.5h by the end.
The warmest days tend to fall around the 11th, averaging 24.8°C (77°F).
Temperatures begin dropping heading into September.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 24°C (75°F) are ideal for full-day outdoor exploration.
Rain usually comes in shorter passing showers rather than all-day rain.
Recent yearly records for August have stayed close to the long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 4°C / 0°C | -1°C / -6°C | 11days (115 mm) Wet | 5.8h Fair | 72% Muggy | 2.2 Moderate | Poor | View Details |
| February | 5°C / 0°C | 0°C / -6°C | 11days (97 mm) Wet | 6.6h Fair | 73% Muggy | 3.2 Moderate | Poor | View Details |
| March | 7°C / 2°C | 2°C / -4°C | 11days (105 mm) Wet | 7.9h Good | 72% Muggy | 4.2 Moderate | Poor | View Details |
| April | 10°C / 6°C | 7°C / 1°C | 11days (99 mm) Wet | 8.5h Good | 75% Muggy | 5.3 High | Poor | View Details |
| May | 15°C / 11°C | 14°C / 8°C | 10days (89 mm) Wet | 9.8h Good | 80% Humid | 6.5 High | Good | View Details |
| June best | 20°C / 16°C | 21°C / 15°C | 9days (68 mm) Wet | 11.1h Excellent | 82% Humid | 6.9 High | Excellent | View Details |
| July best | 24°C / 21°C | 27°C / 21°C | 8days (81 mm) Wet | 11.3h Excellent | 84% Humid | 7.1 Very High | Excellent | View Details |
| August best | 24°C / 20°C | 26°C / 21°C | 8days (64 mm) Wet | 10.8h Excellent | 81% Humid | 6.7 High | Excellent | View Details |
| September best | 21°C / 18°C | 21°C / 17°C | 10days (102 mm) Wet | 8.6h Good | 80% Humid | 5.1 High | Excellent | View Details |
| October | 16°C / 13°C | 15°C / 10°C | 10days (120 mm) Wet | 7.4h Good | 77% Humid | 4 Moderate | Good | View Details |
| November | 11°C / 7°C | 8°C / 2°C | 8days (68 mm) Wet | 6.6h Fair | 70% Muggy | 2.7 Moderate | Poor | View Details |
| December | 6°C / 2°C | 2°C / -3°C | 11days (114 mm) Wet | 5.4h Fair | 71% Muggy | 2 Low | Poor | View Details |
Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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