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Brattle Square Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  |  | | |  |  |  |  | | |
| Chance of T-Storm | Chance of T-Storm | Clear | Sunny | Mostly Clear | Sunny | Partly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy |
| Lo: 69°FLo: 21°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Hi: 79°FHi: 26°C Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C Lo: 61°FLo: 16°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C |
| POP: 20% | POP: 20% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 704 PM EDT Sun Sep 13 2026 
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Issued: 659 PM EDT Sun Sep 13 2026
Key Messages
- Heaviest rainfall ending, drier overnight, though low clouds and areas of fog are possible. A stray early morning shower remains possible too.
- Dry and fall-like Monday into Tuesday, with a chilly start Tuesday morning.
- High pressure in control next week brings generally quiet weather. Brief bout of summer warmth and humidity expected Wed- Fri.
Discussion
... KEY MESSAGE 1...Heaviest rainfall ending, drier overnight, though low clouds and areas of fog are possible. A stray early morning...