Millburn, United States experiences average highs of 17°C (63°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 0.9°C (1.6°F) across the available records.
Millburn, United States Weather & Climate 2026
Monthly climate averages for Millburn, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Nov 
Wetter season: Apr–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.6/10
Best: May, June, July, August, September
UV Index
5
Low
Temperature 17°C / 9°C
Feels Like 16°C / 7°C
Rainy Days 11
Rainfall 99 mm
Sunshine 8 h
Humidity 71%
Wind Speed 17 km/h
Dew Point 8°C
Snow Days 4 days
Frost Days 13 days
Hottest Month
30°C
July
Avg Low21°C
Rain14days
Coldest Month
-3°C
January
Avg High4°C
Rain9days
Driest Month
8days
November
Avg High12°C
Avg Low4°C
Windiest Month
20 km/h
March (Gusts 42)
Sea Temperature
3°C – 28°C
Warmest water: July (
27.9°C
)
Worst Time to Visit
Consider avoiding January, February, December due to very cold temperatures.
Sun Position
Sunrise 05:27
Daylight 15.1h
Sunset 20:31
Live conditions—
Millburn on the map · live conditions
Millburn, United States
- Continent
- Americas
- Country
- United States
- City
- Millburn
- Population
- 20.1K
- Elevation
- 44 m
- Coordinates
- 40.72°, -74.30°
Seasonal Breakdown
Spring
Mar–May
Avg High 16°C
Avg Low 7°C
Rain 11 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 28°C
Avg Low 20°C
Rain 12 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 19°C
Avg Low 11°C
Rain 9 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 6°C
Avg Low -2°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 / -3°C . Feb: 7°C / -2°C . Mar: 11°C / 2°C . Apr: 16°C / 7°C . May: 21°C / 12°C . Jun: 27°C / 17°C . Jul: 30°C / 21°C . Aug: 28°C / 20°C . Sep: 25°C / 17°C . Oct: 19°C / 11°C . Nov: 12°C / 4°C . Dec: 6°C / -1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 88 mm. Feb: 90 mm. Mar: 101 mm. Apr: 106 mm. May: 109 mm. Jun: 85 mm. Jul: 129 mm. Aug: 102 mm. Sep: 97 mm. Oct: 102 mm. Nov: 78 mm. Dec: 104 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 67%. Feb: 69%. Mar: 66%. Apr: 67%. May: 72%. Jun: 70%. Jul: 73%. Aug: 73%. Sep: 74%. Oct: 74%. Nov: 70%. Dec: 72%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 18 km/h . Mar: 20 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: 17 km/h . Nov: 18 km/h . Dec: 17 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 8h. Apr: 9h. May: 9h. Jun: 11h. Jul: 12h. Aug: 10h. Sep: 9h. Oct: 7h. Nov: 7h. Dec: 6h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 3°C . Feb: 4°C . Mar: 7°C . Apr: 11°C . May: 17°C . Jun: 23°C . Jul: 28°C . Aug: 27°C . Sep: 24°C . Oct: 18°C . Nov: 11°C . Dec: 5°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: 6 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 0.9°C (1.6°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 · 30°C | Jul · 30°C |
| Coldest month | Jan 2025 · -5°C | Jan · -3°C |
| Wettest month | May 2025 · 165 mm | Jul · 129 mm |
| Windiest month | Mar 2025 · 22 km/h | Mar · 20 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May best
Excellent June best
Excellent July best
Good August best
Excellent September best
Excellent October
Good November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 4°C / -3°C | 0°C / -7°C | 9days (88 mm) Wet | 6h Fair | 67% Muggy | 2.3 Moderate | Poor | View Details |
| February | 7°C / -2°C | 3°C / -6°C | 9days (90 mm) Wet | 6.7h Fair | 69% Muggy | 3.4 Moderate | Poor | View Details |
| March | 11°C / 2°C | 7°C / -3°C | 10days (101 mm) Wet | 8.1h Good | 66% Muggy | 4.6 Moderate | Poor | View Details |
| April | 16°C / 7°C | 14°C / 3°C | 12days (106 mm) Wet | 8.7h Good | 67% Muggy | 5.3 High | Fair | View Details |
| May best | 21°C / 12°C | 21°C / 10°C | 12days (109 mm) Wet | 9.3h Good | 72% Muggy | 6.2 High | Excellent | View Details |
| June best | 27°C / 17°C | 28°C / 18°C | 11days (85 mm) Wet | 11.2h Excellent | 70% Muggy | 6.9 High | Excellent | View Details |
| July best | 30°C / 21°C | 33°C / 24°C | 14days (129 mm) Wet | 11.5h Excellent | 73% Muggy | 7.2 Very High | Good | View Details |
| August best | 28°C / 20°C | 31°C / 22°C | 12days (102 mm) Wet | 10.3h Excellent | 73% Muggy | 6.6 High | Excellent | View Details |
| September best | 25°C / 17°C | 26°C / 17°C | 10days (97 mm) Wet | 8.7h Good | 74% Muggy | 5 Moderate | Excellent | View Details |
| October | 19°C / 11°C | 18°C / 9°C | 9days (102 mm) Wet | 7.3h Good | 74% Muggy | 4.1 Moderate | Good | View Details |
| November | 12°C / 4°C | 9°C / 1°C | 8days (78 mm) Wet | 7h Good | 70% Muggy | 2.9 Moderate | Fair | View Details |
| December | 6°C / -1°C | 3°C / -5°C | 11days (104 mm) Wet | 5.7h Fair | 72% Muggy | 2 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Millburn 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 Millburn, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Millburn is July, with average daytime highs of 30°C (86°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Millburn is January, with average overnight lows of -3°C (27°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Millburn is July, averaging 129mm of precipitation across 14 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Millburn runs through July, April, May, August, with the heaviest rainfall in July. Based on 10-year averages for Millburn.
Millburn receives approximately 101 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Millburn.
The least favorable months to visit Millburn are January, February, December, primarily due to very cold temperatures. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Millburn is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Millburn is 71%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in June, July, August, September average 25°C (77°F), which is warm and comfortable for swimming and water activities.
Yes, Millburn receives snow. Months with snowfall average 4 snow days and 10 cm (4 in) of accumulation, with about 13 frost days during winter.
Average wind speeds in Millburn are 17 km/h (11 mph). The windiest month is March with peak winds reaching 20 km/h (12 mph) (gusts up to 42 km/h / 26 mph).
Millburn averages 4 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in October.
The annual average dew point in Millburn is 8°C (46°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Millburn 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 Millburn ranges from 7°C (45°F) to 16°C (61°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 Millburn. It earns a climate score of 8.8/10 with Excellent.
For June in Millburn, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 27°C (80°F) and 11 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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