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Stony Brook MA Weather - Clear - 48°F
Clear
48°F
Updated 2:12 am
Feels Like 45°F
Humidity 92%
Wind N 0 mph
Barometer  30.19 in
Dew Point 46°F
Stony Brook MA Weather - Clear - 9°C
Clear
9°C
Updated 2:12 am
Feels Like 7°C
Humidity 92%
Wind N 0 km/h
Barometer  102.2 kPa
Dew Point 8°C
Stony Brook, MA Weather and Current Conditionsstony brook ma weather forecast

Stony Brook, MA Weather Forecast

Stony Brook Massachusetts WeatherStony Brook, Massachusetts Weather Weather Forecast
14 day API forecast for Stony Brook, Massachusetts. Note. The 7-day weather forecast for Stony Brook, MA is the most reliable and accurate forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days in advance.
Stony Brook, MA Weather Forecast Dated: 212 AM Sun Sep 20 2026
Expect a cool pattern with more clouds than sun and occasional showers over the coming period. generally humid conditions and a stable pattern will dominate.

Sunday, September 20, 2026

Mid-Morning
Stony Brook Weather - 2026-09-20 - Morning - Overcast
54°F 12°C
Overcast
Mid-Afternoon
Stony Brook Weather - 2026-09-20 - Afternoon - Drizzle
53°F 12°C
Drizzle
Early-Evening
Stony Brook Weather - 2026-09-20 - Evening - Light Rain
55°F 13°C
Light Rain
Brisk around 53°F 12°C, drier morning followed by showers lasting through evening, with increasing humidity and barometric pressure falling.

Monday, September 21, 2026

Mid-Morning
Stony Brook Weather - 2026-09-21 - Morning - Overcast
54°F 12°C
Overcast
Mid-Afternoon
Stony Brook Weather - 2026-09-21 - Afternoon - Overcast
67°F 20°C
Overcast
Early-Evening
Stony Brook Weather - 2026-09-21 - Evening - Sunny
57°F 14°C
Sunny
Mildly cool near 67°F 20°C, overcast through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure. Winds out of the NE at 6 mph 10 km/h.

Tuesday, September 22, 2026

Mid-Morning
Stony Brook Weather - 2026-09-22 - Morning - Overcast
50°F 10°C
Overcast
Mid-Afternoon
Stony Brook Weather - 2026-09-22 - Afternoon - Overcast
56°F 14°C
Overcast
Early-Evening
Stony Brook Weather - 2026-09-22 - Evening - Overcast
51°F 11°C
Overcast
Chilly near 56°F 14°C, overcast throughout the day, with steady humidity and steady pressure. Winds switching from the NNE to the NE at 7 mph 12 km/h.

Wednesday, September 23, 2026

Mid-Morning
Stony Brook Weather - 2026-09-23 - Morning - Scattered Showers
52°F 11°C
Scattered Showers
Mid-Afternoon
Stony Brook Weather - 2026-09-23 - Afternoon - Overcast
58°F 14°C
Overcast
Early-Evening
Stony Brook Weather - 2026-09-23 - Evening - Overcast
53°F 11°C
Overcast
Cool with a high near 58°F 14°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds moving from the NNE to the NE at 12 mph 19 km/h. Gusts up to 23 mph 38 km/h.

Thursday, September 24, 2026

Mid-Morning
Stony Brook Weather - 2026-09-24 - Morning - Overcast
47°F 9°C
Overcast
Mid-Afternoon
Stony Brook Weather - 2026-09-24 - Afternoon - Cloudy
56°F 13°C
Cloudy
Early-Evening
Stony Brook Weather - 2026-09-24 - Evening - Overcast
55°F 12°C
Overcast
Brisk around 56°F 13°C, overcast throughout the day, with lower humidity and steady pressure. Winds out of the NE at 11 mph 18 km/h. Gusts up to 28 mph 45 km/h.

Friday, September 25, 2026

Mid-Morning
Stony Brook Weather - 2026-09-25 - Morning - Overcast
53°F 12°C
Overcast
Mid-Afternoon
Stony Brook Weather - 2026-09-25 - Afternoon - Overcast
58°F 14°C
Overcast
Early-Evening
Stony Brook Weather - 2026-09-25 - Evening - Overcast
58°F 15°C
Overcast
Mildly cool near 58°F 14°C, overcast throughout the day, with steady humidity and steady pressure. Winds blowing from the NNE at 10 mph 16 km/h. Gusts up to 28 mph 45 km/h.

Saturday, September 26, 2026

Mid-Morning
Stony Brook Weather - 2026-09-26 - Morning - Sunny
55°F 13°C
Sunny
Mid-Afternoon
Stony Brook Weather - 2026-09-26 - Afternoon - Sunny
65°F 18°C
Sunny
Early-Evening
Stony Brook Weather - 2026-09-26 - Evening - Sunny
55°F 13°C
Sunny
Comfortable at 65°F 18°C, cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and barometric pressure rising. Winds decreasing from NE 12 mph 19 km/h to S 4 mph 7 km/h.

Sunday, September 27, 2026

Mid-Morning
Stony Brook Weather - 2026-09-27 - Morning - Light Showers
52°F 11°C
Light Showers
Mid-Afternoon
Stony Brook Weather - 2026-09-27 - Afternoon - Light Showers
53°F 12°C
Light Showers
Early-Evening
Stony Brook Weather - 2026-09-27 - Evening - Overcast
53°F 12°C
Overcast
Crisp with a high near 53°F 12°C, showers lingering into the afternoon before clearing, with steady humidity and barometric pressure rising. Winds switching from the NNE to the NE at 6 mph 9 km/h.

Monday, September 28, 2026

Mid-Morning
Stony Brook Weather - 2026-09-28 - Morning - Overcast
51°F 11°C
Overcast
Mid-Afternoon
Stony Brook Weather - 2026-09-28 - Afternoon - Overcast
64°F 18°C
Overcast
Early-Evening
Stony Brook Weather - 2026-09-28 - Evening - Overcast
55°F 13°C
Overcast
Refreshing around 64°F 18°C, overcast throughout the day, with lower humidity and barometric pressure falling. Winds moving from the NNE to the SE at 5 mph 9 km/h.

Tuesday, September 29, 2026

Mid-Morning
Stony Brook Weather - 2026-09-29 - Morning - Overcast
56°F 13°C
Overcast
Mid-Afternoon
Stony Brook Weather - 2026-09-29 - Afternoon - Overcast
66°F 19°C
Overcast
Early-Evening
Stony Brook Weather - 2026-09-29 - Evening - Overcast
59°F 15°C
Overcast
Mildly cool near 66°F 19°C, cloudy in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure.

Wednesday, September 30, 2026

Mid-Morning
Stony Brook Weather - 2026-09-30 - Morning - Sunny
57°F 14°C
Sunny
Mid-Afternoon
Stony Brook Weather - 2026-09-30 - Afternoon - Overcast
65°F 18°C
Overcast
Early-Evening
Stony Brook Weather - 2026-09-30 - Evening - Overcast
58°F 14°C
Overcast
Comfortable at 65°F 18°C, sunny in the morning, becoming overcast through the afternoon and evening, with steady humidity and barometric pressure rising. Winds swinging from the NNE to the NE at 7 mph 11 km/h. Gusts up to 23 mph 36 km/h.

Thursday, October 1, 2026

Mid-Morning
Stony Brook Weather - 2026-10-01 - Morning - Overcast
54°F 12°C
Overcast
Mid-Afternoon
Stony Brook Weather - 2026-10-01 - Afternoon - Overcast
58°F 15°C
Overcast
Early-Evening
Stony Brook Weather - 2026-10-01 - Evening - Partly Cloudy
52°F 11°C
Partly Cloudy
Cool with a high near 58°F 15°C, overcast throughout the day, with steady humidity and steady pressure. Winds out of the ENE at 11 mph 17 km/h.

Friday, October 2, 2026

Mid-Morning
Stony Brook Weather - 2026-10-02 - Morning - Overcast
54°F 12°C
Overcast
Mid-Afternoon
Stony Brook Weather - 2026-10-02 - Afternoon - Sunny
64°F 18°C
Sunny
Early-Evening
Stony Brook Weather - 2026-10-02 - Evening - Sunny
56°F 14°C
Sunny
Refreshing around 64°F 18°C, overcast in the morning, sunny in the afternoon, and partly cloudy this evening, with steady humidity and barometric pressure falling.

Saturday, October 3, 2026

Mid-Morning
Stony Brook Weather - 2026-10-03 - Morning - Sunny
54°F 12°C
Sunny
Mid-Afternoon
Stony Brook Weather - 2026-10-03 - Afternoon - Partly Cloudy
64°F 18°C
Partly Cloudy
Early-Evening
Stony Brook Weather - 2026-10-03 - Evening - Overcast
54°F 12°C
Overcast
Mildly cool near 64°F 18°C, sunny in the morning, overcast in the afternoon, and cloudy this evening, with steady humidity and steady pressure. Winds turning from the WSW to the S at 6 mph 9 km/h.

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Weather by the Numbers

Sun, 20th
Stony Brook MA Weather - Sunday, Sep 20, 2026 - Light Drizzle
Hi: 55°F 13°C
Lo: 47°F 9°C
Sunrise 06:31 AM
Sunset 06:46 PM
Wind SE 4 mph6 km/h
Dew Point 49°F9°C
uv Index 1
Barometric Pressure 30.09 in1019 mb
POP 64% *
Humidity 85%
Mon, 21st
Stony Brook MA Weather - Monday, Sep 21, 2026 - Sunny
Hi: 67°F 20°C
Lo: 51°F 11°C
Sunrise 06:32 AM
Sunset 06:45 PM
Wind NE 9 mph15 km/h
Dew Point 44°F7°C
uv Index 5
Barometric Pressure 30.12 in1020 mb
POP 2% *
Humidity 48%
Tue, 22nd
Stony Brook MA Weather - Tuesday, Sep 22, 2026 - Overcast
Hi: 57°F 14°C
Lo: 48°F 9°C
Sunrise 06:33 AM
Sunset 06:43 PM
Wind NE 11 mph18 km/h
Dew Point 39°F4°C
uv Index 2
Barometric Pressure 30.39 in1029 mb
POP 13% *
Humidity 54%
Wed, 23rd
Stony Brook MA Weather - Wednesday, Sep 23, 2026 - Overcast
Hi: 59°F 15°C
Lo: 46°F 8°C
Sunrise 06:34 AM
Sunset 06:41 PM
Wind ENE 15 mph24 km/h
Dew Point 42°F5°C
uv Index 4
Barometric Pressure 30.47 in1032 mb
POP 11% *
Humidity 54%
Thu, 24th
Stony Brook MA Weather - Thursday, Sep 24, 2026 - Overcast
Hi: 57°F 14°C
Lo: 43°F 6°C
Sunrise 06:35 AM
Sunset 06:39 PM
Wind NNE 11 mph18 km/h
Dew Point 41°F5°C
uv Index 3
Barometric Pressure 30.36 in1028 mb
POP 17% *
Humidity 68%
Fri, 25th
Stony Brook MA Weather - Friday, Sep 25, 2026 - Overcast
Hi: 59°F 15°C
Lo: 51°F 11°C
Sunrise 06:36 AM
Sunset 06:37 PM
Wind NNE 10 mph17 km/h
Dew Point 39°F4°C
uv Index 3
Barometric Pressure 30.24 in1024 mb
POP 13% *
Humidity 54%
Sat, 26th
Stony Brook MA Weather - Saturday, Sep 26, 2026 - Sunny
Hi: 66°F 19°C
Lo: 49°F 9°C
Sunrise 06:37 AM
Sunset 06:36 PM
Wind NE 8 mph13 km/h
Dew Point 42°F5°C
uv Index 5
Barometric Pressure 30.36 in1028 mb
POP 1% *
Humidity 44%
Sun, 27th
Stony Brook MA Weather - Sunday, Sep 27, 2026 - Patchy Rain Nearby
Hi: 53°F 12°C
Lo: 47°F 8°C
Sunrise 06:38 AM
Sunset 06:34 PM
Wind NNE 9 mph14 km/h
Dew Point 52°F11°C
uv Index 3
Barometric Pressure 29.77 in1008 mb
POP 50% *
Humidity 98%
Mon, 28th
Stony Brook MA Weather - Monday, Sep 28, 2026 - Overcast
Hi: 65°F 18°C
Lo: 46°F 8°C
Sunrise 06:39 AM
Sunset 06:32 PM
Wind NE 9 mph15 km/h
Dew Point 41°F5°C
uv Index 4
Barometric Pressure 30.24 in1024 mb
POP 11% *
Humidity 47%
Tue, 29th
Stony Brook MA Weather - Tuesday, Sep 29, 2026 - Overcast
Hi: 68°F 20°C
Lo: 48°F 9°C
Sunrise 06:41 AM
Sunset 06:30 PM
Wind NE 7 mph12 km/h
Dew Point 41°F5°C
uv Index 4
Barometric Pressure 30.06 in1018 mb
POP 10% *
Humidity 41%
Wed, 30th
Stony Brook MA Weather - Wednesday, Sep 30, 2026 - Overcast
Hi: 67°F 19°C
Lo: 51°F 10°C
Sunrise 06:42 AM
Sunset 06:29 PM
Wind NE 9 mph15 km/h
Dew Point 46°F8°C
uv Index 4
Barometric Pressure 30.21 in1023 mb
POP 4% *
Humidity 49%
Thu, 1st
Stony Brook MA Weather - Thursday, Oct 1, 2026 - Overcast
Hi: 59°F 15°C
Lo: 49°F 10°C
Sunrise 06:43 AM
Sunset 06:27 PM
Wind NE 11 mph18 km/h
Dew Point 41°F5°C
uv Index 3
Barometric Pressure 30.45 in1031 mb
POP 12% *
Humidity 53%
Fri, 2nd
Stony Brook MA Weather - Friday, Oct 2, 2026 - Sunny
Hi: 65°F 18°C
Lo: 49°F 10°C
Sunrise 06:44 AM
Sunset 06:25 PM
Wind NE 5 mph8 km/h
Dew Point 46°F8°C
uv Index 5
Barometric Pressure 30.33 in1027 mb
POP 9% *
Humidity 56%
Sat, 3rd
Stony Brook MA Weather - Saturday, Oct 3, 2026 - Overcast
Hi: 66°F 19°C
Lo: 45°F 7°C
Sunrise 06:45 AM
Sunset 06:23 PM
Wind NE 10 mph16 km/h
Dew Point 43°F6°C
uv Index 4
Barometric Pressure 30.24 in1024 mb
POP 3% *
Humidity 47%
* POP = Probability of Precipitation. Data for 12:00 PM.