Barnstable, United States experiences average highs of 14°C (57°F) and lows of 9°C (48°F) throughout the year. Rainfall is moderate, averaging about 10 rainy days per month. Average highs have stayed broadly stable across the available records.
Barnstable, United States Weather & Climate 2026
Monthly climate averages for Barnstable, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: May–Nov 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.4/10
Best: June, July, August, September
UV Index
5
Low
Temperature 14°C / 9°C
Feels Like 12°C / 6°C
Rainy Days 10
Rainfall 94 mm
Sunshine 8 h
Humidity 76%
Wind Speed 26 km/h
Dew Point 8°C
Snow Days 4 days
Frost Days 8 days
Hottest Month
24°C
July
Avg Low21°C
Rain8days
Coldest Month
0°C
January
Avg High4°C
Rain11days
Driest Month
8days
July
Avg High24°C
Avg Low21°C
Windiest Month
29 km/h
March (Gusts 52)
Sea Temperature
3°C – 25°C
Warmest water: July (
25.2°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:07
Daylight 15.2h
Sunset 20:19
Live conditions—
Barnstable on the map · live conditions
Barnstable, United States
- Continent
- Americas
- Country
- United States
- City
- Barnstable
- Population
- 47.8K
- Elevation
- 11 m
- Coordinates
- 41.70°, -70.30°
Seasonal Breakdown
Spring
Mar–May
Avg High 11°C
Avg Low 6°C
Rain 11 days/mo
Summer
Jun–Aug
Avg High 23°C
Avg Low 19°C
Rain 8 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 16°C
Avg Low 12°C
Rain 9 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 5°C
Avg Low 0°C
Rain 11 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 4°C / 0°C . Feb: 5°C / 0°C . Mar: 7°C / 2°C . Apr: 10°C / 6°C . May: 15°C / 11°C . Jun: 20°C / 16°C . Jul: 24°C / 21°C . Aug: 24°C / 20°C . Sep: 21°C / 18°C . Oct: 16°C / 13°C . Nov: 11°C / 7°C . Dec: 6°C / 2°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 115 mm. Feb: 97 mm. Mar: 105 mm. Apr: 99 mm. May: 89 mm. Jun: 68 mm. Jul: 81 mm. Aug: 64 mm. Sep: 102 mm. Oct: 120 mm. Nov: 68 mm. Dec: 114 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 72%. Feb: 73%. Mar: 72%. Apr: 75%. May: 80%. Jun: 82%. Jul: 84%. Aug: 81%. Sep: 80%. Oct: 77%. Nov: 70%. Dec: 71%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 29 km/h . Feb: 29 km/h . Mar: 29 km/h . Apr: 28 km/h . May: 24 km/h . Jun: 22 km/h . Jul: 22 km/h . Aug: 21 km/h . Sep: 23 km/h . Oct: 26 km/h . Nov: 28 km/h . Dec: 28 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 8h. Apr: 9h. May: 10h. Jun: 11h. Jul: 11h. Aug: 11h. Sep: 9h. Oct: 7h. Nov: 7h. Dec: 5h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 4°C . Feb: 3°C . Mar: 5°C . Apr: 9°C . May: 14°C . Jun: 20°C . Jul: 25°C . Aug: 25°C . Sep: 22°C . Oct: 17°C . Nov: 10°C . Dec: 5°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 7. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 5. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 7 days. Feb: 7 days. Mar: 4 days. Apr: 1 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 3 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 24°C | Jul · 24°C |
| Coldest month | Jan 2025 · -2°C | Jan · 0°C |
| Wettest month | Oct 2025 · 123 mm | Oct · 120 mm |
| Windiest month | Dec 2025 · 32 km/h | Mar · 29 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Good November
Poor December
Poor | 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 |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Barnstable are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Barnstable, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Barnstable is July, with average daytime highs of 24°C (76°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Barnstable is January, with average overnight lows of 0°C (31°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Barnstable is October, averaging 120mm of precipitation across 10 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Barnstable runs through January, February, March, April, with the heaviest rainfall in January. Based on 10-year averages for Barnstable.
Barnstable receives approximately 100 sunshine hours per year. The sunniest month is July with around 11 hours. Based on climate data for Barnstable.
The least favorable months to visit Barnstable are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Barnstable is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Barnstable is 76%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in July, August average 25°C (77°F), which is warm and comfortable for swimming and water activities.
Yes, Barnstable receives snow. Months with snowfall average 4 snow days and 13 cm (5 in) of accumulation, with about 8 frost days during winter.
Average wind speeds in Barnstable are 26 km/h (16 mph). The windiest month is March with peak winds reaching 29 km/h (18 mph) (gusts up to 52 km/h / 32 mph).
Barnstable averages 4 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in September.
The annual average dew point in Barnstable is 8°C (46°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Barnstable has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Barnstable ranges from 6°C (43°F) to 12°C (54°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Barnstable. It earns a climate score of 8.8/10 with Excellent.
For June in Barnstable, pack Umbrella, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 20°C (68°F) and 9 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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