❮
Today Hourly 7 days 30 days September
❯

September 2026 Weather | Waltham, Massachusetts

Tue 9/1
Stormy Weather
Day 73°
Night 63°
95
Wed 9/2
Rainy Weather
Day 73°
Night 66°
60
Thu 9/3
Stormy Weather
Day 79°
Night 57°
87
Fri 9/4
Rainy Weather
Day 75°
Night 55°
56
Sat 9/5
Cloudy Weather
Day 73°
Night 55°
3
Sun 9/6
Rainy Weather
Day 73°
Night 57°
55
Mon 9/7
Rainy Weather
Day 75°
Night 59°
55
Tue 9/8
Cloudy Weather
Day 79°
Night 57°
7
Wed 9/9
Cloudy Weather
Day 79°
Night 59°
3
Thu 9/10
Sunny with a Chance of Thunderstorms
Day 79°
Night 57°
64
Fri 9/11
Cloudy Weather
Day 79°
Night 55°
25
Sat 9/12
Cloudy Weather
Day 72°
Night 54°
25
Sun 9/13
Cloudy Weather
Day 73°
Night 54°
Mon 9/14
Cloudy Weather
Day 79°
Night 55°
Tue 9/15
Cloudy Weather
Day 72°
Night 55°
Wed 9/16
Cloudy Weather
Day 73°
Night 55°
Thu 9/17
Cloudy Weather
Day 77°
Night 55°
Fri 9/18
Sunny Weather
Day 70°
Night 52°
Sat 9/19
Sunny Weather
Day 70°
Night 54°
Sun 9/20
Sunny Weather
Day 72°
Night 55°
Mon 9/21
Cloudy Weather
Day 75°
Night 55°
Tue 9/22
Sunny Weather
Day 77°
Night 55°
19
Wed 9/23
Cloudy Weather
Day 77°
Night 55°
96
Thu 9/24
Cloudy Weather
Day 75°
Night 54°
75
Fri 9/25
Sunny Weather
Day 75°
Night 54°
Sat 9/26
Sunny Weather
Day 75°
Night 54°
3
Sun 9/27
Cloudy Weather
Day 75°
Night 54°
63
Mon 9/28
Sunny Weather
Day 75°
Night 52°
0
Tue 9/29
Sunny Weather
Day 73°
Night 52°
0
Wed 9/30
Sunny Weather
Day 66°
Night 46°
1

Explore U.S. Weather Trends

❄️ Coldest Cities in the U.S. – Live Temperature Rankings 🔥 Hottest Cities Today – Real-Time Heat Observations ⚠️ Active Weather Alerts – Warnings, Watches & Advisories 🌪️ Windiest Cities – Highest Sustained Wind Speeds 🌫️ Worst Air Quality – Cities with the Highest AQI 🍃 Best Air Quality – Cities with the Lowest AQI