Thursday, July 16 – Warm with smoky skies
Hot weather is expected to continue, although forecast confidence decreases regarding temperatures and the timing of any potential cold front or thunderstorms. Current indications favor another day with temperatures in the 90s and moderate to high humidity, with any thunderstorm threat dependent on the evolution of the larger weather pattern.
• High: 91–95°F | Low: 69–73°F | Wind: SW 5–10 mph • Sky: Partly sunny • Precipitation: 20%
Wildfire smoke from Canada will continue to produce hazy skies and poor air quality through much of the day. Temperatures will climb into the upper 80s despite the smoke limiting some daytime heating. A cold front arriving late this afternoon or evening may produce an isolated shower, but most of Waltham should remain dry. Those sensitive to poor air quality should consider limiting prolonged outdoor activity.
High: 86–89°F | Low: 57–60°F | West wind: 10–15 mph, gusts to 25 mph | Hazy sunshine | 20% chance of a passing shower
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Monday, Sept. 21 – Cloudy and cool
A cloudy, cool morning fades to a sunnier afternoon, though temperatures remain in the mid 60s.
| High: 66°F | Low: 49°F | Wind: N 9mph | Sky: Cloudy AM and overnight | Precipitation: 15%
Sunday, Sept. 20 – Chance of rain
Expected rain after 1pm today, as well as patchy fog after 2pm. Rain continues through the evening, slowing down around 2am.
| High: 59°F | Low: 55°F | Wind: SE 6mph | Sky: Rain | Precipitation: 100%
Friday, Sept. 18 – Sunny and warm
Possible patchy for before 8am moves into another warm, sunny mid-September day. Some clouds come in overnight, but leave again by morning, with low to no rain chance.
| High: 79°F | Low: 49°F | Wind: NW 3-8mph | Sky: Sunny; cloudy overnight | Precipitation: > 10%
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