Boston · AutumnMonth summary
Boston weather in September
✅ Good
🌡️ Temperature min / max
15°C – 23°C
🌧 Rainy days
31% of days
☀️ Sunshine
10.8h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.7/10
📅 📅 Best month
August (8.5/10)
Quick decision
Should you visit Boston in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 23°C.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Favourable conditions in September (7.7/10). August scores higher but the gap is small.
By trip type
Boston in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 Good period — 23°C with good sunshine. Reasonable crowds Autumn in Boston is often underrated: 23°C, golden light and declining crowds. An interesting window. Expect rain on 31% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if August (8.5/10) remains theoretically better.
Browse by month
All months for Boston
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌨️ January | -5°C | 3°C | 32% | 3.2 | 8.0h | 4.1/10 |
| 🌨️ February | -4°C | 4°C | 35% | 3.1 | 8.7h | 4.1/10 |
| 🌦️ March | -1°C | 8°C | 35% | 3.6 | 9.9h | 4.6/10 |
| 🌦️ April | 4°C | 13°C | 40% | 3.6 | 10.1h | 5.5/10 |
| 🌤️ May | 9°C | 19°C | 38% | 3.0 | 12.0h | 7.3/10 |
| 🌤️ June | 15°C | 25°C | 38% | 2.6 | 13.0h | 8.1/10 |
| 🌤️ July | 19°C | 29°C | 39% | 3.7 | 13.2h | 8.2/10 |
| 🌤️ August | 18°C | 28°C | 34% | 2.5 | 12.5h | 8.5/10 |
| 🌤️ September | 15°C | 23°C | 31% | 3.6 | 10.8h | 7.7/10 |
| ⛅ October | 9°C | 17°C | 32% | 3.9 | 9.7h | 7.0/10 |
| 🌫️ November | 2°C | 10°C | 30% | 2.8 | 8.7h | 5.0/10 |
| 🌫️ December | -3°C | 5°C | 34% | 3.7 | 7.6h | 4.0/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Boston averages 23°C, 31% rainy days and 10.8h of sunshine per day. Overall weather score: 7.7/10.
See methodology →
Comparison
September vs August (best month)
The best month is August (score 8.5/10). Difference:
- 🌡️ Max temperature : +5°C
- 🌧 Rainy days : +3%
- ☀️ Sunshine : +1.7h/day
FAQ
FAQ — Boston in September
Is September a good time to visit Boston?
September is an excellent time to visit Boston (score 7.7/10). With 23°C, 10.8h of sunshine and 31% rain, conditions are very favourable.
What to do in Boston in September?
With 23°C max and 10.8h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
Activities and tours in Boston
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