Westbrook, United States experiences average highs of 13°C (55°F) and lows of 6°C (43°F) throughout the year. Rainfall is moderate, averaging about 10 rainy days per month. Average highs have cooled by 0.7°C (1.3°F) across the available records.
Westbrook, United States Weather & Climate 2026
Monthly climate averages for Westbrook, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Jul At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.2/10
Best: May, June, July, August, September
UV Index
4
Low
Temperature 13°C / 6°C
Feels Like 12°C / 4°C
Rainy Days 10
Rainfall 92 mm
Sunshine 8 h
Humidity 73%
Wind Speed 17 km/h
Dew Point 5°C
Snow Days 7 days
Frost Days 17 days
Hottest Month
26°C
July
Avg Low19°C
Rain11days
Coldest Month
-6°C
January
Avg High1°C
Rain9days
Driest Month
8days
September
Avg High21°C
Avg Low15°C
Windiest Month
19 km/h
March (Gusts 44)
Sea Temperature
3°C – 18°C
Warmest water: August (
18.3°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:01
Daylight 15.4h
Sunset 20:26
Live conditions—
Westbrook on the map · live conditions
Westbrook, United States
- Continent
- Americas
- Country
- United States
- City
- Westbrook
- Population
- 18K
- Elevation
- 23 m
- Coordinates
- 43.68°, -70.37°
Seasonal Breakdown
Spring
Mar–May
Avg High 11°C
Avg Low 4°C
Rain 11 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 24°C
Avg Low 17°C
Rain 11 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 15°C
Avg Low 9°C
Rain 9 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 2°C
Avg Low -5°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: 1°C / -6°C . Feb: 2°C / -6°C . Mar: 6°C / -2°C . Apr: 11°C / 4°C . May: 17°C / 9°C . Jun: 22°C / 15°C . Jul: 26°C / 19°C . Aug: 25°C / 18°C . Sep: 21°C / 15°C . Oct: 16°C / 10°C . Nov: 9°C / 3°C . Dec: 3°C / -3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 95 mm. Feb: 79 mm. Mar: 94 mm. Apr: 107 mm. May: 77 mm. Jun: 79 mm. Jul: 106 mm. Aug: 82 mm. Sep: 70 mm. Oct: 108 mm. Nov: 84 mm. Dec: 124 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 70%. Feb: 70%. Mar: 68%. Apr: 70%. May: 73%. Jun: 74%. Jul: 76%. Aug: 75%. Sep: 76%. Oct: 76%. Nov: 71%. Dec: 72%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 18 km/h . Feb: 18 km/h . Mar: 19 km/h . Apr: 19 km/h . May: 16 km/h . Jun: 15 km/h . Jul: 14 km/h . Aug: 14 km/h . Sep: 15 km/h . Oct: 16 km/h . Nov: 18 km/h . Dec: 18 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 8h. Apr: 8h. May: 10h. Jun: 11h. Jul: 11h. Aug: 11h. Sep: 9h. Oct: 7h. Nov: 6h. Dec: 5h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 5°C . Feb: 3°C . Mar: 4°C . Apr: 7°C . May: 11°C . Jun: 15°C . Jul: 17°C . Aug: 18°C . Sep: 17°C . Oct: 14°C . Nov: 10°C . Dec: 7°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 6. Jun: UV 6. Jul: UV 7. Aug: UV 6. 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: 10 days. Feb: 9 days. Mar: 8 days. Apr: 4 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 3 days. Dec: 8 days.
Climate Trends
Average highs have cooled by 0.7°C (1.3°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 · 26°C | Jul · 26°C |
| Coldest month | Feb 2025 · -9°C | Jan · -6°C |
| Wettest month | May 2025 · 151 mm | Dec · 124 mm |
| Windiest month | Dec 2025 · 20 km/h | Mar · 19 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May best
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 | 1°C / -6°C | -3°C / -11°C | 9days (95 mm) Wet | 5.9h Fair | 70% Muggy | 2.1 Moderate | Poor | View Details |
| February | 2°C / -6°C | -2°C / -11°C | 10days (79 mm) Wet | 6.9h Fair | 70% Muggy | 3.2 Moderate | Poor | View Details |
| March | 6°C / -2°C | 2°C / -7°C | 11days (94 mm) Wet | 7.9h Good | 68% Muggy | 4 Moderate | Poor | View Details |
| April | 11°C / 4°C | 8°C / 0°C | 12days (107 mm) Wet | 8.4h Good | 70% Muggy | 5.1 High | Poor | View Details |
| May best | 17°C / 9°C | 16°C / 7°C | 10days (77 mm) Wet | 9.7h Good | 73% Muggy | 5.5 High | Good | View Details |
| June best | 22°C / 15°C | 23°C / 14°C | 12days (79 mm) Wet | 11h Excellent | 74% Muggy | 6.2 High | Excellent | View Details |
| July best | 26°C / 19°C | 28°C / 20°C | 11days (106 mm) Wet | 11.4h Excellent | 76% Humid | 6.8 High | Excellent | View Details |
| August best | 25°C / 18°C | 27°C / 19°C | 10days (82 mm) Wet | 10.9h Excellent | 75% Muggy | 6.1 High | Excellent | View Details |
| September best | 21°C / 15°C | 22°C / 15°C | 8days (70 mm) Wet | 9.1h Good | 76% Humid | 5.2 High | Excellent | View Details |
| October | 16°C / 10°C | 14°C / 7°C | 9days (108 mm) Wet | 6.9h Fair | 76% Humid | 3.6 Moderate | Good | View Details |
| November | 9°C / 3°C | 5°C / -1°C | 9days (84 mm) Wet | 6.3h Fair | 71% Muggy | 2.5 Moderate | Poor | View Details |
| December | 3°C / -3°C | -1°C / -8°C | 10days (124 mm) Wet | 5.4h Fair | 72% Muggy | 1.8 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Westbrook are May, June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Westbrook, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Westbrook is July, with average daytime highs of 26°C (78°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Westbrook is January, with average overnight lows of -6°C (21°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Westbrook is December, averaging 124mm of precipitation across 10 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Westbrook runs through April, June, March, July, with the heaviest rainfall in April. Based on 10-year averages for Westbrook.
Westbrook receives approximately 100 sunshine hours per year. The sunniest month is July with around 11 hours. Based on climate data for Westbrook.
The least favorable months to visit Westbrook are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Westbrook is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Westbrook is 73%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Sea temperatures in Summer average 11°C (52°F), which most swimmers will find too cold without a wetsuit.
Yes, Westbrook receives snow. Months with snowfall average 7 snow days and 23 cm (9 in) of accumulation, with about 17 frost days during winter.
Average wind speeds in Westbrook are 17 km/h (11 mph). The windiest month is March with peak winds reaching 19 km/h (12 mph) (gusts up to 44 km/h / 27 mph).
Westbrook averages 4 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in November.
The annual average dew point in Westbrook is 5°C (41°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Westbrook 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 Westbrook ranges from 4°C (39°F) to 12°C (54°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 Westbrook. It earns a climate score of 8.5/10 with Excellent.
For June in Westbrook, pack Umbrella, Waterproof jacket, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 22°C (72°F) and 12 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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