Frost Advisory
Starts in 5 h 59 min
When
From midnight tonight to 9 AM EDT Sunday.
Where
In Connecticut, Southern Fairfield, Southern Middlesex, Southern New Haven, and Southern New London Counties. In New York, Northeast Suffolk and Southeast Suffolk Counties.
Issued for this forecast zone · National Weather Service Upton NY
What, impacts and precautionsHide details
What
Temperatures in the mid 30s, and locally as low 25 to 30 in parts of the Pine Barrens of Long Island, 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; Northeast Suffolk; Southeast Suffolk
See it on weather.gov (opens in a new tab)

Observed 5:40 PM EDT at KGON

Groton Long Point, CT weather

Sunny and 55°13°.

Forecasts agree

Now 55°13°

Sunny

Wind: 8 mph13 km/h; From the west-southwest. Up to 8 mph13 km/h through 6 AM
Dew point: 43°6°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air quality: 16Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.49 inHg1033 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Below 50°10° tonight after 8 PM
Low 38°3° tonight at 5 AM
Above 50°10° tomorrow by 10 AM
High 61°16° tomorrow at 4 PM

TonightDown to 38°3° by 5 AM · Clear
Tomorrow morningUp to 54°12° by 11 AM · Clear
Tomorrow afternoonUp to 61°16° by 4 PM · Clear
Tomorrow nightDown to 43°6° by 4 AM · Clear
Monday morningUp to 54°12° by 11 AM · Clear
Monday afternoonUp to 64°18° by 4 PM · 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 6p	Clear	57°14° (likely 52°11° to 57°14°)	57°14°	0%	5 mph8 km/h from W, gusts 7 mph12 km/h	53%	1%	0
Sat 7p	Clear	54°12° (likely 49°9° to 54°12°)	54°12°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	59%	0%	0
Sat 8p	Clear	49°9° (likely 46°8° to 51°11°)	49°9°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	71%	0%	0
Sat 9p	Clear	48°9° (likely 44°7° to 50°10°)	48°9°	0%	1 mph2 km/h from NW, gusts 8 mph13 km/h	71%	0%	0
Sat 10p	Clear	46°8° (likely 42°6° to 48°9°)	46°8°	0%	1 mph2 km/h from NW, gusts 7 mph12 km/h	76%	0%	0
Sat 11p	Clear	45°7° (likely 41°5° to 47°8°)	45°7°	0%	1 mph2 km/h from NW, gusts 6 mph10 km/h	79%	0%	0
Sun 12a	Clear	44°7° (likely 40°4° to 45°7°)	44°7°	0%	1 mph2 km/h from NW, gusts 7 mph11 km/h	79%	0%	0
Sun 1a	Clear	43°6° (likely 39°4° to 44°7°)	43°6°	0%	2 mph3 km/h from N, gusts 6 mph9 km/h	82%	0%	0
Sun 2a	Clear	41°5° (likely 38°3° to 43°6°)	41°5°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	86%	0%	0
Sun 3a	Clear	40°4° (likely 37°3° to 42°6°)	40°4°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	89%	0%	0
Sun 4a	Clear	40°4° (likely 36°2° to 42°6°)	38°3°	0%	3 mph5 km/h from N, gusts 7 mph12 km/h	85%	0%	0
Sun 5a	Clear	38°3° (likely 36°2° to 41°5°)	36°2°	0%	3 mph5 km/h from N, gusts 7 mph12 km/h	92%	0%	0
Sun 6a	Clear	39°4° (likely 34°1° to 41°5°)	37°3°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	89%	0%	0
Sun 7a	Sunny	39°4° (likely 33°1° to 40°4°)	37°3°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	89%	0%	0
Sun 8a	Sunny	40°4° (likely 34°1° to 41°5°)	38°3°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	89%	0%	0
Sun 9a	Sunny	45°7° (likely 41°5° to 46°8°)	44°7°	0%	3 mph5 km/h from N, gusts 8 mph12 km/h	73%	0%	1
Sun 10a	Sunny	51°11° (likely 50°10° to 53°12°)	51°11°	0%	2 mph3 km/h from NW, gusts 7 mph12 km/h	61%	0%	2
Sun 11a	Sunny	54°12° (likely 54°12° to 58°14°)	54°12°	0%	2 mph3 km/h from NW, gusts 4 mph6 km/h	57%	0%	3
Sun 12p	Sunny	57°14° (likely 57°14° to 62°17°)	57°14°	0%	3 mph5 km/h from NW, gusts 6 mph9 km/h	53%	0%	4
Sun 1p	Sunny	59°15° (likely 59°15° to 64°18°)	59°15°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	51%	0%	4
Sun 2p	Sunny	60°16° (likely 59°15° to 65°18°)	60°16°	0%	6 mph10 km/h from SW, gusts 8 mph12 km/h	51%	0%	4
Sun 3p	Sunny	60°16° (likely 59°15° to 64°18°)	60°16°	0%	6 mph10 km/h from SW, gusts 8 mph14 km/h	53%	0%	3
Sun 4p	Sunny	61°16° (likely 59°15° to 62°17°)	61°16°	0%	6 mph10 km/h from SW, gusts 10 mph15 km/h	51%	0%	2
Sun 5p	Sunny	59°15° (likely 57°14° to 60°16°)	59°15°	0%	5 mph8 km/h from SW, gusts 10 mph16 km/h	57%	0%	1
Sun 6p	Clear	57°14° (likely 53°12° to 57°14°)	57°14°	0%	5 mph8 km/h from SW, gusts 8 mph12 km/h	62%	0%	0
Sun 7p	Clear	55°13° (likely 50°10° to 55°13°)	55°13°	0%	3 mph5 km/h from SW, gusts 7 mph12 km/h	69%	0%	0
Sun 8p	Clear	51°11° (likely 48°9° to 53°12°)	51°11°	0%	3 mph5 km/h from SW, gusts 8 mph13 km/h	83%	0%	0
Sun 9p	Clear	50°10° (likely 47°8° to 53°12°)	49°9°	0%	3 mph5 km/h from SW, gusts 8 mph13 km/h	86%	0%	0
Sun 10p	Clear	49°9° (likely 47°8° to 53°12°)	48°9°	0%	3 mph5 km/h from SW, gusts 10 mph15 km/h	93%	0%	0
Sun 11p	Clear	48°9° (likely 46°8° to 52°11°)	47°8°	0%	3 mph5 km/h from SW, gusts 9 mph15 km/h	96%	0%	0
Mon 12a	Clear	47°8° (likely 46°8° to 52°11°)	46°8°	0%	3 mph5 km/h from W, gusts 11 mph18 km/h	96%	0%	0
Mon 1a	Clear	46°8° (likely 45°7° to 52°11°)	44°7°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	96%	0%	0
Mon 2a	Clear	45°7° (likely 45°7° to 50°10°)	43°6°	0%	5 mph8 km/h from W, gusts 12 mph19 km/h	100%	0%	0
Mon 3a	Clear	44°7° (likely 43°6° to 50°10°)	41°5°	0%	5 mph8 km/h from W, gusts 12 mph19 km/h	100%	0%	0
Mon 4a	Clear	43°6° (likely 42°6° to 49°9°)	40°4°	0%	5 mph8 km/h from W, gusts 13 mph21 km/h	100%	0%	0
Mon 5a	Clear	43°6° (likely 40°4° to 48°9°)	40°4°	0%	5 mph8 km/h from W, gusts 13 mph20 km/h	96%	0%	0
Mon 6a	Clear	41°5° (likely 39°4° to 47°8°)	38°3°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	100%	0%	0
Mon 7a	Sunny	41°5° (likely 39°4° to 47°8°)	37°3°	0%	6 mph10 km/h from W, gusts 12 mph19 km/h	100%	3%	0
Mon 8a	Sunny	43°6° (likely 39°4° to 47°8°)	39°4°	0%	6 mph10 km/h from W, gusts 10 mph16 km/h	93%	10%	0
Mon 9a	Sunny	46°8° (likely 44°7° to 51°11°)	42°6°	0%	7 mph11 km/h from W, gusts 8 mph14 km/h	86%	3%	1
Mon 10a	Sunny	50°10° (likely 50°10° to 56°13°)	47°8°	0%	7 mph11 km/h from W, gusts 9 mph15 km/h	80%	13%	2
Mon 11a	Sunny	54°12° (likely 54°12° to 60°16°)	54°12°	0%	8 mph13 km/h from W, gusts 10 mph17 km/h	74%	7%	3
Mon 12p	Mostly sunny	57°14° (likely 57°14° to 64°18°)	57°14°	0%	9 mph14 km/h from W, gusts 13 mph21 km/h	72%	15%	4
Mon 1p	Mostly sunny	60°16° (likely 60°16° to 66°19°)	60°16°	0%	10 mph16 km/h from W, gusts 13 mph21 km/h	67%	22%	4
Mon 2p	Mostly sunny	62°17° (likely 62°17° to 67°19°)	62°17°	0%	10 mph16 km/h from W, gusts 14 mph23 km/h	67%	27%	4
Mon 3p	Mostly sunny	63°17° (likely 63°17° to 68°20°)	63°17°	0%	10 mph16 km/h from W, gusts 13 mph21 km/h	67%	18%	3
Mon 4p	Sunny	64°18° (likely 63°17° to 67°19°)	64°18°	0%	10 mph16 km/h from W, gusts 13 mph21 km/h	67%	17%	2
Mon 5p	Sunny	63°17° (likely 61°16° to 65°18°)	63°17°	0%	9 mph14 km/h from W, gusts 12 mph19 km/h	70%	8%	1

Days ahead

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

Today, Oct 24. Mostly sunny. High 60°16°, low 38°3°. Typical 61°16° / 41°5°. Dry. Forecasts agree. Best day outdoors this week.
1. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Tonight: Patchy frost after 5am. Mostly clear, with a low around 38. Northwest wind 1 to 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Best day outdoors this week: the one dry, mild day the forecasts agree on (high 60°16°).
High, likely
60°16°–62°17°
Low, likely
31°−1°–38°3°
Typical high / low
61°16° / 41°5°
Wind
10 mph15 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 61°16°, low 41°5°. Typical 61°16° / 40°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  Dry
Official NWS forecast
Day: Sunny. High near 61, with temperatures falling to around 59 in the afternoon. Northwest wind 2 to 6 mph.
Night: Clear. Low around 41, with temperatures rising to around 43 overnight. West wind around 5 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–65°18°
Low, likely
33°1°–41°5°
Typical high / low
61°16° / 40°4°
Wind
8 mph13 km/h, gusts 13 mph22 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 64°18°, low 48°9°. Typical 60°16° / 40°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Official NWS forecast
Day: Sunny, with a high near 64. West wind 5 to 10 mph.
Night: Clear. Low around 48, with temperatures rising to around 50 overnight. Northwest wind 6 to 10 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–67°19°
Low, likely
38°3°–48°9°
Typical high / low
60°16° / 40°4°
Wind
11 mph18 km/h, gusts 21 mph33 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 57°14°, low 38°3°. Typical 60°16° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 57.
Night: Mostly clear, with a low around 38.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
55°13°–57°14°
Low, likely
38°3°–47°8°
Typical high / low
60°16° / 40°4°
Wind
13 mph20 km/h, gusts 25 mph40 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 56°13°, low 45°7°. Typical 60°16° / 39°4°. 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, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 56.
Night: Partly cloudy, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
52°11°–56°13°
Low, likely
29°−2°–45°7°
Typical high / low
60°16° / 39°4°
Wind
10 mph17 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 63°17°, low 52°11°. Typical 59°15° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 63.
Night: Mostly clear, with a low around 52.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
58°14°–64°18°
Low, likely
45°7°–52°11°
Typical high / low
59°15° / 39°4°
Wind
14 mph23 km/h, gusts 32 mph52 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 66°19°, low 50°10°. Typical 59°15° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66.
Night: Mostly clear, with a low around 50.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–70°21°
Low, likely
48°9°–54°12°
Typical high / low
59°15° / 39°4°
Wind
11 mph18 km/h, gusts 20 mph32 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 63°17°, low 47°8°. Typical 58°14° / 38°3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 63.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
58°14°–66°19°
Low, likely
42°6°–52°11°
Typical high / low
58°14° / 38°3°
Wind
13 mph21 km/h, gusts 26 mph42 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 62°17°, low 50°10°. Typical 58°14° / 38°3°. Rain, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 58°15°
  30% chance · 0.01 in0.3 mm
4. Overnight
  midnight–6 AM
  Drizzle, 59°15°
  40% chance · 0.06 in1.4 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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–69°21°
Low, likely
44°7°–54°12°
Typical high / low
58°14° / 38°3°
Wind
11 mph18 km/h, gusts 22 mph36 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 63°17°, low 58°14°. Typical 58°14° / 38°3°. Rain 0.32 in8.1 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 60°16°
  40% chance · 0.09 in2.3 mm
2. Afternoon
  noon–6 PM
  Showers, 63°17°
  30% chance · 0.13 in3.4 mm
3. Evening
  6 PM–midnight
  Showers, 62°16°
  30% chance · 0.1 in2.4 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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
60°16°–68°20°
Low, likely
55°13°–64°18°
Typical high / low
58°14° / 38°3°
Wind
19 mph31 km/h, gusts 29 mph47 km/h

10 days15 days30 days

The outlook

Today
Dry, high 60°, low 38°.
Tomorrow
Dry, high 61°, low 41°.
Monday
Dry, high 64°, low 48°, warming up.
Rest of week
Mostly dry, highs 56–66°.

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

Long Island Sound near New London Harbor (IN MLLW)

5.5 mi

Below flood stage

Level: 1.6 ft

Forecast peak 4.3 ft Tue 10 AM

Reading from Sat 4:54 PM · NWS gauge page

Atlantic Coast at Watch Hill Cove (IN MLLW)

7.9 mi

Below flood stage

Level: 1.2 ft

Forecast peak 3.8 ft Tue 10 AM

Reading from Sat 4 PM · NWS gauge page

Pawcatuck at Westerly

10 mi

Below flood stage

Level: 4.3 ft
Flow: 413 cfs

Forecast peak 4.3 ft Sat 8 PM

Reading from Sat 4 PM · NWS gauge page

Yantic River at Yantic

18 mi

Below flood stage

Level: 2.0 ft
Flow: 88 cfs

Forecast peak 2.0 ft Sat 8 PM

Reading from Sat 4:45 PM · NWS gauge page

For your home

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

Heating this week

About 72% less heating than a typical week.

This week 30Typical 106

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 22
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 9 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 43°F).

Open the windows?

Sun, 2:00 PM–4:00 PM

Good stretch to open the windows.

Is this typical?

NORWICH PUBLIC UTILITY PLANT · official normals 1991–2020 · records 1956–2026

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).

−12°−7°SunOct 18
−7°−4°MonOct 19
−2°−1°TueOct 20
+2°+1°WedOct 21
—ThuOct 22
+4°+2°FriOct 23
−5°−3°SatOct 24

Groton Long Point weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 44 min; Losing 2 min 39 s a day; shortest Dec 21, 1 h 32 min less
Golden hour: 5:15–6:11 PM; Morning 6:52–7:48 AM
Blue hour: 6:11–6:21 PM; Morning 6:41–6:52 AM; first light 6:41 AM

Stars tonight? Fair

Clear 6:21 PM–6:43 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:20 AM · rises 4:50 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Groton Long Point. 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

Groton Long Point, CT weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Long Island Sound near New London Harbor (IN MLLW)

Atlantic Coast at Watch Hill Cove (IN MLLW)

Pawcatuck at Westerly

Yantic River at Yantic

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? Fair

Moon