Trumbull, 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 11 rainy days per month. Average highs have cooled by 0.8°C (1.4°F) across the available records.
Trumbull, United States Weather & Climate 2026
Monthly climate averages for Trumbull, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Apr–Jul At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.3/10
Best: June, July, August, September
UV Index
5
Low
Temperature 15°C / 9°C
Feels Like 14°C / 6°C
Rainy Days 11
Rainfall 107 mm
Sunshine 8 h
Humidity 72%
Wind Speed 19 km/h
Dew Point 7°C
Snow Days 4 days
Frost Days 12 days
Hottest Month
28°C
July
Avg Low21°C
Rain13days
Coldest Month
-2°C
January
Avg High3°C
Rain10days
Driest Month
8days
November
Avg High11°C
Avg Low5°C
Windiest Month
22 km/h
March (Gusts 45)
Sea Temperature
4°C – 24°C
Warmest water: July (
23.7°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:21
Daylight 15.1h
Sunset 20:29
Live conditions—
Trumbull on the map · live conditions
Trumbull, United States
- Continent
- Americas
- Country
- United States
- City
- Trumbull
- Population
- 36K
- Elevation
- 71 m
- Coordinates
- 41.24°, -73.20°
Seasonal Breakdown
Spring
Mar–May
Avg High 14°C
Avg Low 6°C
Rain 12 days/mo
Summer
Jun–Aug
Avg High 26°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
1/3 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: 3°C / -2°C . Feb: 5°C / -2°C . Mar: 9°C / 1°C . Apr: 14°C / 6°C . May: 19°C / 11°C . Jun: 24°C / 17°C . Jul: 28°C / 21°C . Aug: 27°C / 20°C . Sep: 23°C / 17°C . Oct: 18°C / 12°C . Nov: 11°C / 5°C . Dec: 5°C / 0°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 97 mm. Feb: 102 mm. Mar: 107 mm. Apr: 118 mm. May: 109 mm. Jun: 80 mm. Jul: 114 mm. Aug: 90 mm. Sep: 110 mm. Oct: 132 mm. Nov: 91 mm. Dec: 132 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 68%. Feb: 70%. Mar: 67%. Apr: 70%. May: 75%. Jun: 74%. Jul: 76%. Aug: 75%. Sep: 75%. Oct: 74%. Nov: 69%. Dec: 71%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 21 km/h . Feb: 21 km/h . Mar: 22 km/h . Apr: 21 km/h . May: 18 km/h . Jun: 17 km/h . Jul: 16 km/h . Aug: 16 km/h . Sep: 17 km/h . Oct: 19 km/h . Nov: 21 km/h . Dec: 21 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 8h. Apr: 9h. May: 10h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 9h. Oct: 7h. Nov: 7h. Dec: 6h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 4°C . Feb: 4°C . Mar: 5°C . Apr: 9°C . May: 14°C . Jun: 19°C . Jul: 24°C . Aug: 24°C . Sep: 22°C . Oct: 18°C . Nov: 12°C . Dec: 7°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 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: 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: 5 days.
Climate Trends
Average highs have cooled by 0.8°C (1.4°F) across the available records. Average rainfall is trending wetter by about 15 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 28°C | Jul · 28°C |
| Coldest month | Jan 2025 · -4°C | Jan · -2°C |
| Wettest month | May 2025 · 189 mm | Oct · 132 mm |
| Windiest month | Dec 2025 · 24 km/h | Mar · 22 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair 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 | 3°C / -2°C | -1°C / -8°C | 10days (97 mm) Wet | 6.1h Fair | 68% Muggy | 2.3 Moderate | Poor | View Details |
| February | 5°C / -2°C | 1°C / -7°C | 10days (102 mm) Wet | 6.7h Fair | 70% Muggy | 3.3 Moderate | Poor | View Details |
| March | 9°C / 1°C | 5°C / -4°C | 11days (107 mm) Wet | 8.3h Good | 67% Muggy | 4.5 Moderate | Poor | View Details |
| April | 14°C / 6°C | 11°C / 2°C | 12days (118 mm) Wet | 8.9h Good | 70% Muggy | 5.3 High | Fair | View Details |
| May | 19°C / 11°C | 18°C / 9°C | 12days (109 mm) Wet | 9.6h Good | 75% Muggy | 6.2 High | Good | View Details |
| June best | 24°C / 17°C | 26°C / 17°C | 10days (80 mm) Wet | 11.2h Excellent | 74% Muggy | 7 High | Excellent | View Details |
| July best | 28°C / 21°C | 31°C / 23°C | 13days (114 mm) Wet | 11.6h Excellent | 76% Humid | 7.2 Very High | Excellent | View Details |
| August best | 27°C / 20°C | 29°C / 22°C | 11days (90 mm) Wet | 10.7h Excellent | 75% Muggy | 6.4 High | Excellent | View Details |
| September best | 23°C / 17°C | 24°C / 17°C | 9days (110 mm) Wet | 8.8h Good | 75% Muggy | 5.2 High | Excellent | View Details |
| October | 18°C / 12°C | 16°C / 9°C | 11days (132 mm) Wet | 7.4h Good | 74% Muggy | 4 Moderate | Good | View Details |
| November | 11°C / 5°C | 8°C / 1°C | 8days (91 mm) Wet | 6.9h Fair | 69% Muggy | 2.8 Moderate | Poor | View Details |
| December | 5°C / 0°C | 1°C / -5°C | 11days (132 mm) Wet | 5.7h Fair | 71% Muggy | 2 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Trumbull are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Trumbull, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Trumbull is July, with average daytime highs of 28°C (82°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Trumbull is January, with average overnight lows of -2°C (28°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Trumbull is October, averaging 132mm of precipitation across 11 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Trumbull runs through July, April, May, March, with the heaviest rainfall in July. Based on 10-year averages for Trumbull.
Trumbull receives approximately 102 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Trumbull.
The least favorable months to visit Trumbull 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 Trumbull is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Trumbull is 72%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in July, August, September average 23°C (73°F), which is warm and comfortable for swimming and water activities.
Yes, Trumbull receives snow. Months with snowfall average 4 snow days and 11 cm (4 in) of accumulation, with about 12 frost days during winter.
Average wind speeds in Trumbull are 19 km/h (12 mph). The windiest month is March with peak winds reaching 22 km/h (14 mph) (gusts up to 45 km/h / 28 mph).
Trumbull averages 5 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in October.
The annual average dew point in Trumbull is 7°C (45°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Trumbull 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 Trumbull ranges from 6°C (43°F) to 14°C (57°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 Trumbull. It earns a climate score of 8.8/10 with Excellent.
For June in Trumbull, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 24°C (76°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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