Waltham Weather Forecast
- 65
- 75
Thunderstorms Likely
- 59
- 77
Mostly Cloudy
- 62
- 78
Chance Rain Showers
- 68
- 78
Chance Thunderstorms
- 70
- 84
Chance Rain Showers
- 68
- 85
Chance Thunderstorms
Today 18 Jul Mower
Partly sunny. Near steady temperature in the lower 70s. South Winds 10 to 15 Mph.
Tonight 18 Jul Mower
Mostly cloudy with a chance of Thunderstorms. A slight chance of Showers in the Evening, then Showers after midnight. Warmer with Lows in the mid 60s. South Winds 5 to 10 Mph. Chance of rain 80 percent.
Waltham Temperature Statistics
July Temperature
Austin Municipal (10.6 miles)
Lowest 13 July, 2025
55.4 °FAverage July
74.1 °FHighest 3 July, 2025
89.6 °F
Climate (2020–Present)
Austin Municipal (10.6 miles)
Average Low 2020–2025
38.4 °FAverage 2020–2025
47.8 °FAverage High 2020–2025
57.2 °F