Frost Advisory
Ends in 8 h 56 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 11:50 PM EDT at KGON

Niantic, CT weather

Clear and 37°3°.

Mostly agree

Now 37°3°

Clear

Wind: Calm; Light through 12 PM
Dew point: 36°2°; Comfortable
Humidity: 93%; Air 37°3°, dew point 36°2° · fog or dew likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 37Good; PM2.5 (fine particles) · tomorrow moderate
Pressure: 30.52 inHg1034 hPa; Steady over the next 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 35°2° tonight at 5 AM
Above 50°10° today by 10 AM
High 63°17° today at 2 PM
Below 50°10° tonight after 8 PM

TonightDown to 35°2° by 5 AM · Clear
This morningUp to 56°13° by 11 AM · Clear
This afternoonUp to 63°17° by 2 PM · Clear
TonightDown to 42°6° by 4 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 66°19° by 3 PM · Clear
Tomorrow nightDown to 53°12° by 10 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
Sun 12a	Clear	40°4° (likely 40°4° to 44°7°)	40°4°	0%	0 mph0 km/h, gusts 5 mph9 km/h	82%	0%	0
Sun 1a	Clear	39°4° (likely 39°4° to 43°6°)	39°4°	0%	1 mph2 km/h from N, gusts 7 mph11 km/h	85%	1%	0
Sun 2a	Clear	37°3° (likely 37°3° to 43°6°)	37°3°	0%	1 mph2 km/h from N, gusts 8 mph13 km/h	89%	0%	0
Sun 3a	Clear	37°3° (likely 37°3° to 42°6°)	37°3°	0%	1 mph2 km/h from N, gusts 7 mph11 km/h	89%	1%	0
Sun 4a	Clear	36°2° (likely 36°2° to 42°6°)	36°2°	0%	1 mph2 km/h from N, gusts 7 mph11 km/h	92%	0%	0
Sun 5a	Clear	35°2° (likely 35°2° to 41°5°)	35°2°	0%	1 mph2 km/h from N, gusts 7 mph11 km/h	96%	0%	0
Sun 6a	Clear	36°2° (likely 35°2° to 40°4°)	36°2°	0%	1 mph2 km/h from N, gusts 7 mph11 km/h	89%	0%	0
Sun 7a	Sunny	35°2° (likely 34°1° to 40°4°)	35°2°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	96%	0%	0
Sun 8a	Sunny	37°3° (likely 35°2° to 42°6°)	37°3°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	89%	0%	0
Sun 9a	Sunny	44°7° (likely 42°6° to 46°8°)	44°7°	0%	2 mph3 km/h from N, gusts 6 mph9 km/h	70%	0%	1
Sun 10a	Sunny	51°11° (likely 50°10° to 54°12°)	51°11°	0%	1 mph2 km/h from N, gusts 5 mph7 km/h	56%	0%	2
Sun 11a	Sunny	56°13° (likely 55°13° to 60°16°)	56°13°	0%	1 mph2 km/h from NW, gusts 4 mph7 km/h	49%	0%	3
Sun 12p	Sunny	59°15° (likely 58°14° to 64°18°)	59°15°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	45%	0%	4
Sun 1p	Sunny	61°16° (likely 60°16° to 65°18°)	61°16°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	44%	0%	4
Sun 2p	Sunny	63°17° (likely 60°16° to 66°19°)	63°17°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	43%	0%	4
Sun 3p	Sunny	62°17° (likely 61°16° to 66°19°)	62°17°	0%	5 mph8 km/h from SW, gusts 9 mph15 km/h	44%	0%	3
Sun 4p	Sunny	62°17° (likely 60°16° to 64°18°)	62°17°	0%	5 mph8 km/h from SW, gusts 10 mph16 km/h	46%	0%	2
Sun 5p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	3 mph5 km/h from SW, gusts 10 mph15 km/h	50%	0%	1
Sun 6p	Clear	56°13° (likely 54°12° to 56°13°)	56°13°	0%	2 mph3 km/h from SW, gusts 9 mph15 km/h	59%	0%	0
Sun 7p	Clear	52°11° (likely 51°11° to 53°12°)	52°11°	0%	2 mph3 km/h from SW, gusts 9 mph14 km/h	71%	0%	0
Sun 8p	Clear	49°9° (likely 49°9° to 53°12°)	49°9°	0%	1 mph2 km/h from SW, gusts 8 mph13 km/h	83%	0%	0
Sun 9p	Clear	49°9° (likely 47°8° to 53°12°)	49°9°	0%	1 mph2 km/h from SW, gusts 8 mph13 km/h	83%	0%	0
Sun 10p	Clear	47°8° (likely 46°8° to 52°11°)	47°8°	0%	1 mph2 km/h from SW, gusts 9 mph14 km/h	89%	0%	0
Sun 11p	Clear	46°8° (likely 46°8° to 52°11°)	46°8°	0%	1 mph2 km/h from SW, gusts 9 mph15 km/h	93%	1%	0
Mon 12a	Clear	45°7° (likely 45°7° to 52°11°)	45°7°	0%	1 mph2 km/h from W, gusts 11 mph17 km/h	96%	0%	0
Mon 1a	Clear	45°7° (likely 45°7° to 51°11°)	45°7°	0%	2 mph3 km/h from W, gusts 12 mph20 km/h	93%	0%	0
Mon 2a	Clear	43°6° (likely 43°6° to 49°9°)	43°6°	0%	2 mph3 km/h from W, gusts 13 mph21 km/h	100%	0%	0
Mon 3a	Clear	43°6° (likely 43°6° to 48°9°)	43°6°	0%	2 mph3 km/h from W, gusts 14 mph23 km/h	96%	0%	0
Mon 4a	Clear	42°6° (likely 42°6° to 48°9°)	40°4°	0%	3 mph5 km/h from W, gusts 13 mph21 km/h	100%	0%	0
Mon 5a	Clear	42°6° (likely 40°4° to 47°8°)	40°4°	0%	3 mph5 km/h from W, gusts 12 mph19 km/h	96%	25%	0
Mon 6a	Clear	40°4° (likely 40°4° to 46°8°)	38°3°	0%	3 mph5 km/h from W, gusts 10 mph17 km/h	100%	1%	0
Mon 7a	Sunny	40°4° (likely 39°4° to 45°7°)	38°3°	0%	3 mph5 km/h from W, gusts 13 mph21 km/h	96%	2%	0
Mon 8a	Sunny	42°6° (likely 39°4° to 45°7°)	40°4°	0%	3 mph5 km/h from W, gusts 11 mph17 km/h	89%	0%	0
Mon 9a	Sunny	47°8° (likely 46°8° to 49°9°)	46°8°	0%	3 mph5 km/h from W, gusts 9 mph15 km/h	79%	8%	1
Mon 10a	Sunny	52°11° (likely 52°11° to 56°13°)	52°11°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	71%	13%	2
Mon 11a	Sunny	57°14° (likely 56°13° to 61°16°)	57°14°	0%	6 mph10 km/h from W, gusts 9 mph15 km/h	64%	0%	3
Mon 12p	Sunny	61°16° (likely 60°16° to 64°18°)	61°16°	0%	7 mph11 km/h from W, gusts 11 mph17 km/h	58%	11%	4
Mon 1p	Sunny	63°17° (likely 62°17° to 66°19°)	63°17°	0%	8 mph13 km/h from W, gusts 13 mph21 km/h	56%	7%	4
Mon 2p	Sunny	65°18° (likely 63°17° to 67°19°)	65°18°	0%	9 mph14 km/h from W, gusts 14 mph22 km/h	54%	5%	4
Mon 3p	Sunny	66°19° (likely 65°18° to 67°19°)	66°19°	0%	9 mph14 km/h from W, gusts 14 mph22 km/h	54%	5%	3
Mon 4p	Sunny	65°18° (likely 63°17° to 67°19°)	65°18°	0%	8 mph13 km/h from W, gusts 13 mph22 km/h	60%	13%	2
Mon 5p	Sunny	64°18° (likely 62°17° to 65°18°)	64°18°	0%	7 mph11 km/h from W, gusts 13 mph21 km/h	65%	6%	1
Mon 6p	Clear	61°16° (likely 57°14° to 61°16°)	61°16°	0%	6 mph10 km/h from W, gusts 10 mph16 km/h	72%	1%	0
Mon 7p	Clear	58°14° (likely 55°13° to 58°14°)	58°14°	0%	6 mph10 km/h from W, gusts 9 mph14 km/h	77%	2%	0
Mon 8p	Clear	55°13° (likely 54°12° to 56°13°)	55°13°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	83%	3%	0
Mon 9p	Clear	54°12° (likely 54°12° to 55°13°)	54°12°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	86%	18%	0
Mon 10p	Clear	53°12° (likely 53°12° to 55°13°)	53°12°	0%	3 mph5 km/h from NW, gusts 12 mph19 km/h	89%	43%	0
Mon 11p	Clear	53°12° (likely 53°12° to 55°13°)	53°12°	0%	3 mph5 km/h from NW, gusts 14 mph22 km/h	89%	12%	0

Days ahead

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

Today, Oct 25. Sunny. High 63°17°, low 35°2°. Typical 60°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  Dry
Official NWS forecast
Today: Areas of frost before 9am. Sunny. High near 63, with temperatures falling to around 61 in the afternoon. Northwest wind 1 to 5 mph.
Tonight: Areas of frost after 2am. Clear, with a low around 35. North wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–66°19°
Low, likely
34°1°–40°4°
Typical high / low
60°16° / 42°6°
Wind
8 mph13 km/h
UV peak
4
Tomorrow, Oct 26. Sunny. High 66°19°, low 45°7°. Typical 60°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Official NWS forecast
Day: Sunny. High near 66, with temperatures falling to around 64 in the afternoon. West wind 3 to 9 mph.
Night: Clear. Low around 45, with temperatures rising to around 47 overnight. Northwest wind 3 to 7 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–67°19°
Low, likely
38°3°–45°7°
Typical high / low
60°16° / 42°6°
Wind
10 mph17 km/h, gusts 27 mph44 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 60°16°, low 37°3°. Typical 60°16° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 43°6°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny. High near 60, with temperatures falling to around 58 in the afternoon.
Night: Mostly clear, with a low around 37.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
56°13°–60°16°
Low, likely
37°3°–46°8°
Typical high / low
60°16° / 42°6°
Wind
10 mph16 km/h, gusts 27 mph43 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 57°14°, low 45°7°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 46°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 57.
Night: Partly cloudy, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–57°14°
Low, likely
32°0°–45°7°
Typical high / low
59°15° / 42°6°
Wind
8 mph13 km/h, gusts 17 mph27 km/h
UV peak
4
Thursday, Oct 29. Mostly sunny. High 64°18°, low 51°11°. Typical 59°15° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 64.
Night: Mostly clear, with a low around 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
44°7°–51°11°
Typical high / low
59°15° / 41°5°
Wind
12 mph19 km/h, gusts 33 mph53 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 68°20°, low 49°9°. Typical 59°15° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  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 68.
Night: Mostly clear, with a low around 49.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
67°19°–73°23°
Low, likely
48°9°–55°13°
Typical high / low
59°15° / 41°5°
Wind
11 mph18 km/h, gusts 24 mph39 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 65°18°, low 47°8°. Typical 58°14° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  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 65.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–66°19°
Low, likely
44°7°–54°12°
Typical high / low
58°14° / 41°5°
Wind
7 mph12 km/h, gusts 21 mph33 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 64°18°, low 51°11°. Typical 58°14° / 40°4°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 59°15°
  30% chance
4. Overnight
  midnight–6 AM
  Drizzle, 60°16°
  40% chance · 0.07 in1.8 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
61°16°–69°21°
Low, likely
45°7°–55°13°
Typical high / low
58°14° / 40°4°
Wind
10 mph15 km/h, gusts 26 mph42 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 63°17°, low 58°14°. Typical 58°14° / 40°4°. Rain 0.37 in9.4 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 61°16°
  40% chance · 0.22 in5.7 mm
2. Afternoon
  noon–6 PM
  Drizzle, 63°17°
  30% chance · 0.11 in2.8 mm
3. Evening
  6 PM–midnight
  Drizzle, 61°16°
  30% chance · 0.04 in1.1 mm
4. Overnight
  midnight–6 AM
  Drizzle, 59°15°
  30% chance · 0.12 in3.1 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°–69°21°
Low, likely
55°13°–64°18°
Typical high / low
58°14° / 40°4°
Wind
14 mph23 km/h, gusts 32 mph52 km/h
Tuesday, Nov 3. Cloudy. High 62°17°, low 51°11°. Typical 57°14° / 40°4°. Rain 0.18 in4.6 mm, 30% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  30% chance · 0.16 in4.2 mm
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  30% chance · 0.08 in2.1 mm
3. Evening
  6 PM–midnight
  Clear, 54°12°
  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 agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–63°17°
Low, likely
44°7°–55°13°
Typical high / low
57°14° / 40°4°
Wind
14 mph23 km/h, gusts 36 mph58 km/h
UV peak
4

10 days15 days30 days

The outlook

Today
Dry, high 63°, low 35°.
Tomorrow
Dry, high 66°, low 45°, warming up.
Tuesday
Dry, high 60°, low 37°, cooling off.
Rest of week
Highs 57–68°; chance of precipitation on Monday.

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)

6.2 mi

Below flood stage

Level: 2.6 ft

Forecast peak 4.3 ft Tue 10 AM

Reading from Sat 10:54 PM · NWS gauge page

Yantic River at Yantic

17 mi

Below flood stage

Level: 2.0 ft
Flow: 88 cfs

Forecast peak 2.0 ft Sun 2 AM

Reading from Sat 10:45 PM · NWS gauge page

Atlantic Coast at Watch Hill Cove (IN MLLW)

18 mi

Below flood stage

Level: 2.6 ft

Forecast peak 3.8 ft Tue 10 AM

Reading from Sat 10 PM · NWS gauge page

Pawcatuck at Westerly

20 mi

Below flood stage

Level: 4.3 ft
Flow: 409 cfs

Forecast peak 4.3 ft Sun 2 AM

Reading from Sat 10 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 29Typical 102

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 21
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 36°F).

Open the windows?

Today, 1:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Groton New London Airport · official normals 1991–2020 · records 1999–2026

Oct 25, today vs a typical year

Today’s expected high is 3°2° warmer than typical.

Last 7 days vs normal

On average 0° colder than normal (daily mean temperature).

−3°−2°MonOct 19
+2°+1°TueOct 20
+1°±0°WedOct 21
+5°+3°ThuOct 22
−4°−2°FriOct 23
—SatOct 24
—SunOct 25

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

Sun & moon

Sun

Daylight: 10 h 41 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 30 min less
Golden hour: 5:14–6:10 PM; Morning 6:54–7:50 AM
Blue hour: 6:10–6:21 PM; Morning 6:43–6:54 AM; first light 6:43 AM

Stars tonight? Fair

Clear 12:04–6:43 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

99% lit · growing

Today: sets 6:33 AM · rises 5:17 PM
Full moon: Oct 26
New moon: Nov 9

Looking south from Niantic. The highest point on the skyline is about 700 ft, 17 mi away.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

Niantic, CT weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Tuesday

Rest of week

What changed since yesterday

Radar

Rivers

Long Island Sound near New London Harbor (IN MLLW)

Yantic River at Yantic

Atlantic Coast at Watch Hill Cove (IN MLLW)

Pawcatuck at Westerly

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 25, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon