January 9 is generally a great time to visit Boston. While there is a slight chance of rain (24%), showers are usually brief. Expect comfortable 2°C weather. It's a lively time to explore Boston, with most attractions operating at full capacity.
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Essential Travel Info for Boston
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
Greater Boston uses10-digit dialing. Th...
Safety
Moderate Safety
GPI: 2.44
Boston Weather Forecast for January 9
"Cold & Crisp. Expect average highs of 2.2°C. 24% chance of snow."
What to Wear in Boston in January
Based on historical data for January 9, Boston typically experiences temperatures between -5.9°C and 2.2°C. We recommend packing heavy coat, scarf, gloves to stay comfortable. Trends suggest it will stay mostly dry (24% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Boston
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
Average High
2.2°C
Daytime Peak
Average Low
-5.9°C
Nighttime Low
Feels Like
-2.8°C
🥶 Slightly colder
Snow Chance
24%
Avg 1.8mm if it snows
Snowfall
0.8 cm
~24% chance
Pressure
1015.6 hPa
High volatility
Boston Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 200 min to burn
Type III-IV
🟡 300 min to burn
Type V-VI
🟢 500 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
-3.1°C
Dry air
Heat Stress
Low
No heat warning
😕 Best outdoor time:
Midday (11 AM - 3 PM) when warmest
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
Busy
69/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~465
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Boston
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:14
☀️ Noon
11:52
🌇 Sunset
16:30
⏱️ Daylight
9h 16m
Wind Speed
22.3 km/h
Moderate wind
Sunshine
6.0 hrs
Direct Sun (Cloud-free)
Humidity
68%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Boston
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in Boston
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟢 Moderate
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Rapid pressure changes detected. High risk for meteosensitive people.
Weather unlikely to affect joint pain.
Fish are active due to pressure changes.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
Atlantic Hurricane Risk
Season: Jun - Nov
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Boston on January 9 averages 2.2°C with a 24% precipitation probability. Wedding/Outdoor Event Score: 20/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Boston Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
January 12
4°C • 24% rain
Score
28
January 11
4°C • 26% rain
Score
27
January 13
3.4°C • 25% rain
Score
26
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (January 9) in other destinations
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📍 Is Boston Worth Visiting on January 9?
Planning a trip to Boston on January 9? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 2.2°C with a 24% historical precipitation risk.
✈️ Travel Logistics: Approximately 465 landing slots available daily during this period, indicating peak tourist activity.
🌊 Coastal Conditions: Water temperature averages 4.2°C (polar plunge). Wave conditions are generally fun waves with heights around 0.84m.
📊 Historical Extremes: The hottest January 9 recorded in the last 30 years saw temperatures hit 6.7°C in 2016, while the coldest dropped to -19.2°C in 2017.