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Wellesley, Mass., weather forecast for Sept. 11-19, 2025

September 10, 2025 by Matthew Moll

weather consultingHere’s the updated daily weather forecast by Meteorologist Matthew Moll of New England Weather Consulting:

A coastal low exits midweek, leaving behind a stretch of dry, comfortable weather. Thursday
brings the warmest day of the period before cooler air filters in Friday. High pressure dominates
through Saturday with sunshine and seasonable temperatures. By Sunday, a weak disturbance
may bring some clouds and a stray shower, but most of the period remains dry. Highs stay in the
low to mid-70s with crisp nights in the 50s, and another bright stretch continues into the middle
and latter part of next week.

Thursday, September 11 – Warmest day of the stretch
High pressure settles in behind the departing storm system. Sunshine dominates, with
temperatures climbing near 80 and humidity remaining comfortable. A mild, pleasant evening
follows with a cool overnight.
• High: 78–80°F | Low: 54–56°F | Wind: N 5–7 mph
• Sky: Mostly sunny
• Chance of rain: 0%
• Dew point: 50–54°F

Friday, September 12 – Cooler, sunny
A cooler air mass arrives on northeasterly winds. Despite the bright sunshine, temperatures top
out lower than Thursday. Nights dip into the upper 40s to near 50 under clear skies.
• High: 70–72°F | Low: 49–51°F | Wind: NE 5–7 mph
• Sky: Sunny
• Chance of rain: 0%
• Dew point: 48–52°F

Saturday, September 13 – Seasonable and bright
High pressure remains in place, keeping skies sunny and humidity low. Temperatures rebound
slightly into the mid-70s. Evening conditions stay mild and comfortable.
• High: 73–75°F | Low: 52–54°F | Wind: Calm → SE 5–6 mph

• Sky: Sunny
• Chance of rain: 0%
• Dew point: 50–54°F

Sunday, September 14 – Partly sunny, slight shower risk
A weak disturbance approaches, bringing some added clouds and perhaps a stray afternoon or
evening shower. Most of the day stays dry and seasonable with pleasant warmth.
• High: 74–76°F | Low: 55–57°F | Wind: SW 3–6 mph
• Sky: Partly sunny, late-day clouds
• Chance of rain: 20–30%
• Dew point: 52–56°F

Monday, September 15 – Slightly cooler, still pleasant
A blend of sun and clouds with highs in the lower 70s. Comfortable humidity continues, with
another crisp night in the mid-50s.
• High: 71–73°F | Low: 55–57°F | Wind: E 5–7 mph
• Sky: Mostly sunny
• Chance of rain: 10–20%
• Dew point: 50–54°F

Tuesday, September 16 – Seasonable stretch continues
High pressure holds firm. Sunshine dominates, and conditions stay comfortably mild during the
day and cool at night.
• High: 73–75°F | Low: 54–56°F | Wind: NE 5–7 mph
• Sky: Mostly sunny
• Chance of rain: 0–10%
• Dew point: 50–54°F

Wednesday, September 17 – Bright and cool
Nearly identical to Tuesday. Sunshine, light winds, and comfortable temperatures create
another classic September day.
• High: 72–74°F | Low: 53–55°F | Wind: Light/variable → E
• Sky: Mostly sunny
• Chance of rain: 0%
• Dew point: 48–52°F

Thursday, September 18 – Fair, slightly milder
Sunshine mixes with a few clouds as temperatures edge back toward the mid-70s. Humidity
remains low, with a cool night in the low 50s.
• High: 73–75°F | Low: 52–54°F | Wind: E 5–8 mph
• Sky: Mostly sunny
• Chance of rain: 0%
• Dew point: 50–54°F

Friday, September 19 – Early fall perfection
The week closes out with another gorgeous day. Bright sunshine, highs in the mid-70s, and
comfortable humidity make for ideal early-fall weather.
• High: 74–76°F | Low: 52–54°F | Wind: E 5–8 mph
• Sky: Sunny
• Chance of rain: 0%
• Dew point: 50–54°F


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