Westerly, United States experiences average highs of 15°C (59°F) and lows of 9°C (48°F) throughout the year. Rainfall is moderate, averaging about 10 rainy days per month. Average highs have cooled by 0.6°C (1.1°F) across the available records.
Westerly, United States Weather & Climate 2026
Monthly climate averages for Westerly, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Apr–Aug At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.3/10
Best: June, July, August, September, October
UV Index
5
Low
Temperature 15°C / 9°C
Feels Like 14°C / 7°C
Rainy Days 10
Rainfall 99 mm
Sunshine 8 h
Humidity 74%
Wind Speed 19 km/h
Dew Point 8°C
Snow Days 4 days
Frost Days 11 days
Hottest Month
27°C
July
Avg Low21°C
Rain12days
Coldest Month
-2°C
January
Avg High4°C
Rain10days
Driest Month
9days
October
Avg High18°C
Avg Low12°C
Windiest Month
21 km/h
March (Gusts 48)
Sea Temperature
5°C – 21°C
Warmest water: August (
21.1°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:15
Daylight 15.1h
Sunset 20:24
Live conditions—
Westerly on the map · live conditions
Westerly, United States
- Continent
- Americas
- Country
- United States
- City
- Westerly
- Population
- 17.9K
- Elevation
- 11 m
- Coordinates
- 41.38°, -71.83°
Seasonal Breakdown
Spring
Mar–May
Avg High 13°C
Avg Low 6°C
Rain 11 days/mo
Summer
Jun–Aug
Avg High 25°C
Avg Low 19°C
Rain 11 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 17°C
Avg Low 11°C
Rain 9 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 5°C
Avg Low -1°C
Rain 10 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 / -2°C . Feb: 5°C / -1°C . Mar: 9°C / 1°C . Apr: 13°C / 6°C . May: 18°C / 11°C . Jun: 23°C / 16°C . Jul: 27°C / 21°C . Aug: 26°C / 20°C . Sep: 23°C / 17°C . Oct: 18°C / 12°C . Nov: 12°C / 5°C . Dec: 6°C / 1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 103 mm. Feb: 91 mm. Mar: 102 mm. Apr: 107 mm. May: 100 mm. Jun: 78 mm. Jul: 109 mm. Aug: 94 mm. Sep: 95 mm. Oct: 109 mm. Nov: 80 mm. Dec: 124 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 68%. Feb: 71%. Mar: 68%. Apr: 72%. May: 77%. Jun: 78%. Jul: 80%. Aug: 78%. Sep: 78%. Oct: 76%. Nov: 70%. Dec: 71%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 21 km/h . Feb: 21 km/h . Mar: 21 km/h . Apr: 20 km/h . May: 18 km/h . Jun: 16 km/h . Jul: 16 km/h . Aug: 16 km/h . Sep: 16 km/h . Oct: 19 km/h . Nov: 20 km/h . Dec: 20 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 8h. Apr: 9h. May: 10h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 9h. Oct: 8h. Nov: 7h. Dec: 6h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 7°C . Feb: 5°C . Mar: 5°C . Apr: 8°C . May: 12°C . Jun: 16°C . Jul: 21°C . Aug: 21°C . Sep: 21°C . Oct: 18°C . Nov: 13°C . Dec: 9°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 5. Apr: UV 5. May: UV 6. 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: 6 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: 1 days. Dec: 4 days.
Climate Trends
Average highs have cooled by 0.6°C (1.1°F) 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 · 27°C | Jul · 27°C |
| Coldest month | Jan 2025 · -4°C | Jan · -2°C |
| Wettest month | May 2025 · 156 mm | Dec · 124 mm |
| Windiest month | Dec 2025 · 23 km/h | Mar · 21 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July best
Good August best
Excellent September best
Excellent October best
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 4°C / -2°C | 0°C / -7°C | 10days (103 mm) Wet | 6.1h Fair | 68% Muggy | 2.3 Moderate | Poor | View Details |
| February | 5°C / -1°C | 1°C / -6°C | 10days (91 mm) Wet | 6.8h Fair | 71% Muggy | 3.3 Moderate | Poor | View Details |
| March | 9°C / 1°C | 5°C / -3°C | 10days (102 mm) Wet | 8.2h Good | 68% Muggy | 4.5 Moderate | Poor | View Details |
| April | 13°C / 6°C | 11°C / 2°C | 11days (107 mm) Wet | 8.7h Good | 72% Muggy | 5.3 High | Fair | View Details |
| May | 18°C / 11°C | 17°C / 9°C | 12days (100 mm) Wet | 9.8h Good | 77% Humid | 6.3 High | Good | View Details |
| June best | 23°C / 16°C | 25°C / 16°C | 10days (78 mm) Wet | 11.2h Excellent | 78% Humid | 7.1 Very High | Excellent | View Details |
| July best | 27°C / 21°C | 30°C / 22°C | 12days (109 mm) Wet | 11.5h Excellent | 80% Humid | 7.2 Very High | Good | View Details |
| August best | 26°C / 20°C | 29°C / 22°C | 11days (94 mm) Wet | 10.7h Excellent | 78% Humid | 6.6 High | Excellent | View Details |
| September best | 23°C / 17°C | 24°C / 17°C | 10days (95 mm) Wet | 8.6h Good | 78% Humid | 5.1 High | Excellent | View Details |
| October best | 18°C / 12°C | 17°C / 10°C | 9days (109 mm) Wet | 7.5h Good | 76% Humid | 4 Moderate | Good | View Details |
| November | 12°C / 5°C | 9°C / 1°C | 9days (80 mm) Wet | 6.7h Fair | 70% Muggy | 2.8 Moderate | Poor | View Details |
| December | 6°C / 1°C | 2°C / -4°C | 10days (124 mm) Wet | 5.6h Fair | 71% Muggy | 2 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Westerly are June, July, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Westerly, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Westerly is July, with average daytime highs of 27°C (80°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Westerly is January, with average overnight lows of -2°C (29°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Westerly is December, averaging 124mm of precipitation across 10 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Westerly runs through May, July, April, August, with the heaviest rainfall in May. Based on 10-year averages for Westerly.
Westerly receives approximately 101 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Westerly.
The least favorable months to visit Westerly are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider June, July, August, September, October instead.
The annual average UV index in Westerly is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Westerly is 74%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Sea temperatures in Summer average 13°C (55°F), which most swimmers will find too cold without a wetsuit.
Yes, Westerly receives snow. Months with snowfall average 4 snow days and 11 cm (4 in) of accumulation, with about 11 frost days during winter.
Average wind speeds in Westerly are 19 km/h (12 mph). The windiest month is March with peak winds reaching 21 km/h (13 mph) (gusts up to 48 km/h / 30 mph).
Westerly averages 5 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in November.
The annual average dew point in Westerly is 8°C (46°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Westerly 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 Westerly ranges from 7°C (45°F) to 14°C (57°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Westerly. It earns a climate score of 8.8/10 with Excellent.
For June in Westerly, pack Umbrella, Waterproof jacket, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 23°C (74°F) and 10 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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