Frost Advisory
Ends in 3 h 26 min
When
Until 9 AM EDT Saturday.
Where
In Connecticut, Southern Fairfield, Southern Middlesex, Southern New Haven, and Southern New London Counties. In New York, Southern Westchester County.
Issued for this forecast zone · National Weather Service Upton NY
What, impacts and precautionsHide details
What
Temperatures as low as the mid 30s will result in frost formation.
Impacts
Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Precautionary actions
Take steps now to protect tender plants from the cold.
Areas: Southern Fairfield; Southern New Haven; Southern Middlesex; Southern New London; Southern Westchester
See it on weather.gov (opens in a new tab)

Observed 5:15 AM EDT at KWST

Stonington, CT weather

Clear and 30°−1°.

Mostly agree

Now 30°−1°

Clear

Wind: Calm; Up to 6 mph10 km/h through 5 PM
Dew point: 30°−1°; Dry · up to 39°4° by 3 PM (comfortable)
Humidity: 100%; Air 30°−1°, dew point 30°−1° · frost likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 44Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.49 inHg1033 hPa; Rising slowly · +0.02 inHg+0.8 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 34°1° today at 7 AM
Above 50°10° today by 10 AM
High 60°16° today at 2 PM
Below 50°10° tonight after 8 PM

This morningUp to 55°13° by 11 AM · Partly cloudy
This afternoonNear 59°15° · Partly cloudy
TonightDown to 36°2° by 5 AM · Clear
Tomorrow morningUp to 56°13° by 11 AM · Clear
Tomorrow afternoonNear 59°15° · Clear
Tomorrow nightDown to 43°6° by 4 AM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 5a	Clear	36°2° (likely 32°0° to 40°4°)	36°2°	0%	3 mph5 km/h from N, gusts 9 mph14 km/h	92%	12%	0
Sat 6a	Clear	35°2° (likely 32°0° to 40°4°)	35°2°	0%	3 mph5 km/h from N, gusts 9 mph15 km/h	92%	19%	0
Sat 7a	Partly sunny	34°1° (likely 31°−1° to 39°4°)	34°1°	0%	3 mph5 km/h from N, gusts 10 mph16 km/h	96%	27%	0
Sat 8a	Sunny	37°3° (likely 33°1° to 40°4°)	37°3°	0%	3 mph5 km/h from N, gusts 10 mph16 km/h	92%	38%	0
Sat 9a	Partly sunny	42°6° (likely 39°4° to 43°6°)	42°6°	0%	3 mph5 km/h from N, gusts 7 mph12 km/h	82%	32%	1
Sat 10a	Sunny	50°10° (likely 46°8° to 50°10°)	50°10°	0%	3 mph5 km/h from N, gusts 6 mph9 km/h	61%	25%	2
Sat 11a	Cloudy	55°13° (likely 51°11° to 55°13°)	55°13°	0%	3 mph5 km/h from NW, gusts 5 mph9 km/h	51%	56%	3
Sat 12p	Partly sunny	59°15° (likely 53°12° to 59°15°)	59°15°	0%	5 mph8 km/h from NW, gusts 7 mph11 km/h	42%	56%	4
Sat 1p	Partly sunny	58°14° (likely 56°13° to 59°15°)	58°14°	0%	6 mph10 km/h from W, gusts 7 mph12 km/h	45%	53%	4
Sat 2p	Partly sunny	60°16° (likely 56°13° to 61°16°)	60°16°	0%	6 mph10 km/h from W, gusts 8 mph12 km/h	44%	49%	4
Sat 3p	Mostly sunny	60°16° (likely 57°14° to 61°16°)	60°16°	0%	6 mph10 km/h from W, gusts 8 mph13 km/h	46%	44%	3
Sat 4p	Mostly sunny	60°16° (likely 57°14° to 60°16°)	60°16°	0%	6 mph10 km/h from W, gusts 8 mph13 km/h	47%	21%	2
Sat 5p	Mostly sunny	58°14° (likely 57°14° to 59°15°)	58°14°	0%	5 mph8 km/h from W, gusts 8 mph12 km/h	53%	9%	1
Sat 6p	Clear	55°13° (likely 52°11° to 55°13°)	55°13°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	59%	13%	0
Sat 7p	Clear	52°11° (likely 47°8° to 53°12°)	52°11°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	66%	3%	0
Sat 8p	Clear	49°9° (likely 45°7° to 52°11°)	49°9°	0%	1 mph2 km/h from W, gusts 6 mph10 km/h	74%	0%	0
Sat 9p	Clear	46°8° (likely 44°7° to 51°11°)	46°8°	0%	1 mph2 km/h from W, gusts 5 mph9 km/h	76%	0%	0
Sat 10p	Clear	44°7° (likely 42°6° to 50°10°)	44°7°	0%	1 mph2 km/h from NW, gusts 6 mph10 km/h	82%	0%	0
Sat 11p	Clear	43°6° (likely 41°5° to 48°9°)	43°6°	0%	1 mph2 km/h from NW, gusts 7 mph11 km/h	82%	0%	0
Sun 12a	Clear	41°5° (likely 40°4° to 47°8°)	41°5°	0%	1 mph2 km/h from NW, gusts 7 mph11 km/h	89%	0%	0
Sun 1a	Clear	40°4° (likely 39°4° to 46°8°)	40°4°	0%	1 mph2 km/h from NW, gusts 6 mph9 km/h	89%	0%	0
Sun 2a	Clear	39°4° (likely 38°3° to 45°7°)	39°4°	0%	2 mph3 km/h from N, gusts 6 mph9 km/h	92%	0%	0
Sun 3a	Clear	37°3° (likely 37°3° to 43°6°)	37°3°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	96%	0%	0
Sun 4a	Clear	37°3° (likely 36°2° to 43°6°)	37°3°	0%	2 mph3 km/h from N, gusts 6 mph9 km/h	96%	5%	0
Sun 5a	Clear	36°2° (likely 35°2° to 43°6°)	36°2°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	100%	8%	0
Sun 6a	Clear	36°2° (likely 35°2° to 42°6°)	36°2°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	92%	9%	0
Sun 7a	Sunny	36°2° (likely 34°1° to 41°5°)	36°2°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	92%	9%	0
Sun 8a	Sunny	38°3° (likely 35°2° to 42°6°)	38°3°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	92%	7%	0
Sun 9a	Sunny	44°7° (likely 42°6° to 47°8°)	44°7°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	76%	0%	1
Sun 10a	Sunny	52°11° (likely 50°10° to 53°12°)	52°11°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	59%	0%	2
Sun 11a	Sunny	56°13° (likely 54°12° to 59°15°)	56°13°	0%	2 mph3 km/h from NW, gusts 4 mph6 km/h	53%	0%	3
Sun 12p	Sunny	59°15° (likely 57°14° to 62°17°)	59°15°	0%	3 mph5 km/h from W, gusts 6 mph9 km/h	47%	0%	4
Sun 1p	Sunny	60°16° (likely 58°14° to 64°18°)	60°16°	0%	5 mph8 km/h from SW, gusts 7 mph11 km/h	47%	0%	4
Sun 2p	Sunny	61°16° (likely 58°14° to 63°17°)	61°16°	0%	6 mph10 km/h from SW, gusts 9 mph14 km/h	48%	0%	4
Sun 3p	Sunny	62°17° (likely 59°15° to 63°17°)	62°17°	0%	6 mph10 km/h from SW, gusts 9 mph14 km/h	46%	0%	3
Sun 4p	Sunny	60°16° (likely 58°14° to 61°16°)	60°16°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	51%	0%	2
Sun 5p	Sunny	58°14° (likely 57°14° to 59°15°)	58°14°	0%	5 mph8 km/h from SW, gusts 9 mph15 km/h	55%	0%	1
Sun 6p	Clear	56°13° (likely 54°12° to 56°13°)	56°13°	0%	3 mph5 km/h from SW, gusts 9 mph14 km/h	62%	0%	0
Sun 7p	Clear	51°11° (likely 50°10° to 55°13°)	51°11°	0%	3 mph5 km/h from SW, gusts 9 mph15 km/h	77%	0%	0
Sun 8p	Clear	49°9° (likely 48°9° to 54°12°)	49°9°	0%	2 mph3 km/h from SW, gusts 10 mph16 km/h	83%	0%	0
Sun 9p	Clear	48°9° (likely 46°8° to 52°11°)	48°9°	0%	2 mph3 km/h from SW, gusts 11 mph18 km/h	86%	0%	0
Sun 10p	Clear	47°8° (likely 46°8° to 51°11°)	47°8°	0%	2 mph3 km/h from SW, gusts 11 mph18 km/h	86%	0%	0
Sun 11p	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	2 mph3 km/h from SW, gusts 11 mph17 km/h	86%	0%	0
Mon 12a	Clear	46°8° (likely 45°7° to 48°9°)	46°8°	0%	2 mph3 km/h from W, gusts 10 mph16 km/h	83%	0%	0
Mon 1a	Clear	45°7° (likely 44°7° to 46°8°)	45°7°	0%	3 mph5 km/h from W, gusts 9 mph15 km/h	86%	0%	0
Mon 2a	Clear	45°7° (likely 43°6° to 45°7°)	45°7°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	82%	3%	0
Mon 3a	Clear	44°7° (likely 43°6° to 45°7°)	44°7°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	82%	6%	0
Mon 4a	Clear	43°6° (likely 42°6° to 45°7°)	43°6°	0%	3 mph5 km/h from W, gusts 4 mph7 km/h	86%	3%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Cloudy. High 60°16°, low 33°1°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Official NWS forecast
Today: Areas of frost before 9am. Mostly sunny, with a high near 60. Northwest wind around 6 mph.
Tonight: Areas of frost. Mostly clear, with a low around 33. North wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–61°16°
Low, likely
31°−1°–39°4°
Typical high / low
61°16° / 44°7°
Wind
8 mph12 km/h, gusts 14 mph23 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 63°17°, low 38°3°. Typical 61°16° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Sunny, with a high near 63. West wind 2 to 6 mph.
Night: Clear, with a low around 38. West wind around 3 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–64°18°
Low, likely
34°1°–41°5°
Typical high / low
61°16° / 44°7°
Wind
9 mph15 km/h, gusts 15 mph24 km/h
UV peak
4
Monday, Oct 26. Sunny. High 66°19°, low 44°7°. Typical 60°16° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66. West wind 3 to 8 mph.
Night: Clear, with a low around 44. Northwest wind 5 to 8 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
63°17°–67°19°
Low, likely
39°4°–47°8°
Typical high / low
60°16° / 43°6°
Wind
12 mph20 km/h, gusts 23 mph36 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 56°13°, low 36°2°. Typical 60°16° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 44°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 56. North wind 3 to 9 mph.
Night: Mostly clear, with a low around 36. Northeast wind 2 to 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
55°13°–57°14°
Low, likely
36°2°–47°8°
Typical high / low
60°16° / 43°6°
Wind
15 mph23 km/h, gusts 27 mph43 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 56°13°, low 44°7°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 35°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 56. East wind around 6 mph.
Night: Partly cloudy, with a low around 44. South wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
53°12°–56°13°
Low, likely
30°−1°–44°7°
Typical high / low
60°16° / 43°6°
Wind
11 mph18 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 62°17°, low 51°11°. Typical 60°16° / 42°6°. Dry. Mostly agree. Best day outdoors this week.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 62. South wind 2 to 9 mph.
Night: Partly cloudy, with a low around 51. Southwest wind around 7 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Best day outdoors this week: the one dry, mild day the forecasts agree on (high 62°17°).
High, likely
57°14°–63°17°
Low, likely
40°4°–51°11°
Typical high / low
60°16° / 42°6°
Wind
15 mph23 km/h, gusts 32 mph52 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 65°18°, low 50°10°. Typical 59°15° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 65. West wind 6 to 9 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
63°17°–70°21°
Low, likely
47°8°–54°12°
Typical high / low
59°15° / 42°6°
Wind
12 mph19 km/h, gusts 29 mph47 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 63°17°, low 47°8°. Typical 59°15° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 51°10°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–70°21°
Low, likely
39°4°–53°12°
Typical high / low
59°15° / 42°6°
Wind
11 mph17 km/h, gusts 27 mph44 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 62°17°, low 49°9°. Typical 59°15° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  20% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
55°13°–67°19°
Low, likely
36°2°–55°13°
Typical high / low
59°15° / 42°6°
Wind
12 mph19 km/h, gusts 19 mph30 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 61°16°, low 55°13°. Typical 58°14° / 41°5°. Rain 0.06 in1.5 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 57°14°
  20% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  20% chance · 0.02 in0.5 mm
3. Evening
  6 PM–midnight
  Mostly clear, 56°13°
  30% chance · 0.01 in0.3 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–63°17°
Low, likely
52°11°–58°14°
Typical high / low
58°14° / 41°5°
Wind
14 mph22 km/h, gusts 22 mph35 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 60°, low 33°.
Tomorrow
Dry, high 63°, low 38°, warming up.
Monday
Dry, high 66°, low 44°, warming up.
Rest of week
Mostly dry, highs 56–65°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (OKX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Atlantic Coast at Watch Hill Cove (IN MLLW)

2.7 mi

Below flood stage

Level: 2.2 ft

Forecast peak 3.8 ft Sat 8 AM

Reading from Sat 4 AM · NWS gauge page

Pawcatuck at Westerly

4.9 mi

Below flood stage

Level: 4.4 ft
Flow: 417 cfs

Forecast peak 4.4 ft Sat 8 AM

Reading from Sat 4 AM · NWS gauge page

Long Island Sound near New London Harbor (IN MLLW)

10 mi

Below flood stage

Level: 2.0 ft

Forecast peak 4.3 ft Sat 9 AM

Reading from Sat 4 AM · NWS gauge page

Pawcatuck above Wood River Junction

14 mi

Below flood stage

Level: 2.6 ft
Flow: 161 cfs

Forecast peak 2.6 ft Sat 8 AM

Reading from Sat 3:45 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 65% less heating than a typical week.

This week 33Typical 94

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 24
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 13 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 30°F). Indoor air will run dry too — a humidifier keeping indoor relative humidity in the 30–50% range is more comfortable and cuts static shocks, without going so high it fogs cold windows.

Open the windows?

Today, 2:00 PM–4:00 PM

Good stretch to open the windows.

Is this typical?

Westerly State Airport · official normals 1991–2020 · records 1999–2026

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

On average 4°2° colder than normal (daily mean temperature).

−10°−6°SunOct 18
−6°−4°MonOct 19
±0°TueOct 20
±0°WedOct 21
+3°+1°ThuOct 22
−6°−4°FriOct 23
—SatOct 24

Stonington weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 44 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 32 min less
Golden hour: 5:14–6:10 PM; Morning 6:52–7:48 AM
Blue hour: 6:10–6:21 PM; Morning 6:41–6:52 AM; first light 6:41 AM

Stars tonight? Good

Mostly clear 5:34–6:41 AM; moon 96% lit but below the horizon.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:19 AM · rises 4:50 PM
Full moon: Oct 26
New moon: Nov 9

Looking south from Stonington. Open water to the horizon.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

1 active weather alert

Frost Advisory

Stonington, CT weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Atlantic Coast at Watch Hill Cove (IN MLLW)

Pawcatuck at Westerly

Long Island Sound near New London Harbor (IN MLLW)

Pawcatuck above Wood River Junction

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Good

Moon