Frost Advisory
Starts in 9 h 43 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 as low as 35 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 1:45 PM EDT at KGON

Conning Towers-Nautilus Park, CT weather

Sunny and 57°14°, jacket by 6 PM.

Forecasts agree

Now 57°14°

Sunny

Wind: 8 mph13 km/h; From the south-southwest. Up to 8 mph13 km/h through 2 AM
Dew point: 37°3°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air quality: 18Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.51 inHg1033 hPa; Falling · −0.05 inHg−1.6 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (58°14° then, 57°14° now)

Good hours for

Below 50°10° tonight after 8 PM
Low 35°2° tonight at 5 AM
Above 50°10° tomorrow by 10 AM

This afternoonNear 60°16° · Partly cloudy
TonightDown to 35°2° by 5 AM · Clear
Tomorrow morningUp to 56°13° by 11 AM · Clear
Tomorrow afternoonNear 60°16° · Clear
Tomorrow nightDown to 40°4° by 5 AM · Clear
Monday morningUp to 57°14° by 11 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 2p	Partly sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	39%	16%	2
Sat 3p	Partly sunny	61°16° (likely 59°15° to 62°17°)	61°16°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	41%	51%	2
Sat 4p	Sunny	60°16° (likely 58°14° to 61°16°)	60°16°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	42%	35%	1
Sat 5p	Sunny	58°14° (likely 56°13° to 58°14°)	58°14°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	49%	4%	0
Sat 6p	Clear	54°12° (likely 51°11° to 54°12°)	54°12°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	57%	2%	0
Sat 7p	Clear	50°10° (likely 47°8° to 50°10°)	50°10°	0%	1 mph2 km/h from W, gusts 6 mph9 km/h	66%	2%	0
Sat 8p	Clear	48°9° (likely 44°7° to 48°9°)	48°9°	0%	0 mph0 km/h, gusts 5 mph8 km/h	71%	0%	0
Sat 9p	Clear	45°7° (likely 42°6° to 46°8°)	45°7°	0%	0 mph0 km/h, gusts 4 mph6 km/h	76%	0%	0
Sat 10p	Clear	43°6° (likely 40°4° to 45°7°)	43°6°	0%	0 mph0 km/h, gusts 3 mph6 km/h	79%	0%	0
Sat 11p	Clear	41°5° (likely 39°4° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 3 mph5 km/h	85%	0%	0
Sun 12a	Clear	40°4° (likely 38°3° to 43°6°)	40°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	89%	0%	0
Sun 1a	Clear	39°4° (likely 37°3° to 41°5°)	39°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	92%	0%	0
Sun 2a	Clear	38°3° (likely 37°3° to 40°4°)	38°3°	0%	1 mph2 km/h from N, gusts 5 mph9 km/h	92%	0%	0
Sun 3a	Clear	37°3° (likely 36°2° to 40°4°)	37°3°	0%	1 mph2 km/h from N, gusts 6 mph10 km/h	96%	0%	0
Sun 4a	Clear	36°2° (likely 35°2° to 39°4°)	36°2°	0%	1 mph2 km/h from N, gusts 7 mph11 km/h	96%	0%	0
Sun 5a	Clear	35°2° (likely 35°2° to 38°3°)	35°2°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	100%	0%	0
Sun 6a	Clear	35°2° (likely 34°1° to 38°3°)	35°2°	0%	2 mph3 km/h from N, gusts 8 mph12 km/h	89%	0%	0
Sun 7a	Sunny	35°2° (likely 33°1° to 36°2°)	35°2°	0%	2 mph3 km/h from N, gusts 8 mph12 km/h	92%	0%	0
Sun 8a	Sunny	36°2° (likely 34°1° to 38°3°)	36°2°	0%	2 mph3 km/h from N, gusts 7 mph12 km/h	92%	0%	0
Sun 9a	Sunny	41°5° (likely 41°5° to 45°7°)	41°5°	0%	1 mph2 km/h from N, gusts 7 mph11 km/h	85%	0%	1
Sun 10a	Sunny	50°10° (likely 49°9° to 52°11°)	50°10°	0%	1 mph2 km/h from NW, gusts 7 mph11 km/h	63%	0%	2
Sun 11a	Sunny	56°13° (likely 56°13° to 58°14°)	56°13°	0%	1 mph2 km/h from NW, gusts 5 mph9 km/h	51%	0%	3
Sun 12p	Sunny	60°16° (likely 60°16° to 61°16°)	60°16°	0%	2 mph3 km/h from W, gusts 5 mph7 km/h	44%	0%	4
Sun 1p	Sunny	62°17° (likely 62°17° to 64°18°)	62°17°	0%	3 mph5 km/h from SW, gusts 7 mph11 km/h	43%	0%	4
Sun 2p	Sunny	62°17° (likely 62°17° to 65°18°)	62°17°	0%	3 mph5 km/h from SW, gusts 8 mph12 km/h	43%	0%	4
Sun 3p	Sunny	63°17° (likely 63°17° to 65°18°)	63°17°	0%	3 mph5 km/h from SW, gusts 9 mph14 km/h	43%	0%	3
Sun 4p	Sunny	61°16° (likely 61°16° to 63°17°)	61°16°	0%	3 mph5 km/h from SW, gusts 9 mph14 km/h	46%	0%	2
Sun 5p	Sunny	59°15° (likely 58°14° to 60°16°)	59°15°	0%	3 mph5 km/h from SW, gusts 8 mph13 km/h	51%	0%	1
Sun 6p	Clear	56°13° (likely 52°11° to 56°13°)	56°13°	0%	2 mph3 km/h from SW, gusts 9 mph14 km/h	59%	0%	0
Sun 7p	Clear	50°10° (likely 49°9° to 51°11°)	50°10°	0%	1 mph2 km/h from SW, gusts 8 mph13 km/h	77%	1%	0
Sun 8p	Clear	48°9° (likely 47°8° to 50°10°)	48°9°	0%	1 mph2 km/h from SW, gusts 8 mph13 km/h	83%	1%	0
Sun 9p	Clear	46°8° (likely 45°7° to 49°9°)	46°8°	0%	1 mph2 km/h from SW, gusts 10 mph16 km/h	89%	1%	0
Sun 10p	Clear	45°7° (likely 45°7° to 48°9°)	45°7°	0%	1 mph2 km/h from SW, gusts 10 mph15 km/h	89%	1%	0
Sun 11p	Clear	44°7° (likely 44°7° to 47°8°)	44°7°	0%	1 mph2 km/h from SW, gusts 9 mph15 km/h	93%	0%	0
Mon 12a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	1 mph2 km/h from W, gusts 10 mph17 km/h	93%	0%	0
Mon 1a	Clear	43°6° (likely 42°6° to 46°8°)	43°6°	0%	1 mph2 km/h from W, gusts 13 mph20 km/h	89%	0%	0
Mon 2a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	1 mph2 km/h from W, gusts 8 mph13 km/h	93%	0%	0
Mon 3a	Clear	41°5° (likely 41°5° to 45°7°)	41°5°	0%	1 mph2 km/h from W, gusts 11 mph18 km/h	92%	0%	0
Mon 4a	Clear	41°5° (likely 40°4° to 45°7°)	41°5°	0%	2 mph3 km/h from W, gusts 11 mph18 km/h	92%	0%	0
Mon 5a	Clear	40°4° (likely 39°4° to 45°7°)	40°4°	0%	2 mph3 km/h from W, gusts 11 mph18 km/h	92%	1%	0
Mon 6a	Clear	39°4° (likely 38°3° to 44°7°)	39°4°	0%	2 mph3 km/h from W, gusts 10 mph17 km/h	92%	2%	0
Mon 7a	Sunny	39°4° (likely 38°3° to 44°7°)	39°4°	0%	3 mph5 km/h from W, gusts 10 mph16 km/h	92%	1%	0
Mon 8a	Sunny	40°4° (likely 39°4° to 46°8°)	40°4°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	92%	14%	0
Mon 9a	Sunny	45°7° (likely 44°7° to 52°11°)	45°7°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	79%	11%	1
Mon 10a	Sunny	51°11° (likely 51°11° to 57°14°)	51°11°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	66%	9%	2
Mon 11a	Sunny	57°14° (likely 55°13° to 61°16°)	57°14°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	55%	11%	3
Mon 12p	Sunny	61°16° (likely 59°15° to 64°18°)	61°16°	0%	6 mph10 km/h from W, gusts 13 mph21 km/h	49%	3%	4
Mon 1p	Sunny	64°18° (likely 62°17° to 66°19°)	64°18°	0%	7 mph11 km/h from W, gusts 12 mph20 km/h	46%	5%	4

Days ahead

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

Today, Oct 24. Mostly sunny. High 61°16°, low 33°1°. Typical 61°16° / 41°5°. Dry. Forecasts agree.
1. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
2. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Official NWS forecast
Today: Sunny. High near 61, with temperatures falling to around 58 in the afternoon. West wind around 3 mph.
Tonight: Patchy frost after midnight. Clear. Low around 33, with temperatures rising to around 35 overnight. Northwest wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–62°17°
Low, likely
31°−1°–33°1°
Typical high / low
61°16° / 41°5°
Wind
6 mph10 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 37°3°. Typical 61°16° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Sunny. High near 64, with temperatures falling to around 59 in the afternoon. West wind around 3 mph.
Night: Patchy frost after 5am. Clear. Low around 37, with temperatures rising to around 40 overnight. Southwest wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–65°18°
Low, likely
33°1°–37°3°
Typical high / low
61°16° / 40°4°
Wind
7 mph10 km/h, gusts 14 mph22 km/h
UV peak
4
Monday, Oct 26. Sunny. High 67°19°, low 42°6°. Typical 60°16° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Official NWS forecast
Day: Patchy frost before 9am. Sunny. High near 67, with temperatures falling to around 64 in the afternoon. West wind 2 to 7 mph.
Night: Clear. Low around 42, with temperatures rising to around 44 overnight.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
65°18°–67°19°
Low, likely
39°4°–44°7°
Typical high / low
60°16° / 40°4°
Wind
8 mph13 km/h, gusts 20 mph32 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 57°14°, low 32°0°. Typical 60°16° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 44°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 35°1°
  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 32.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–57°14°
Low, likely
32°0°–42°6°
Typical high / low
60°16° / 40°4°
Wind
9 mph14 km/h, gusts 25 mph40 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 56°13°, low 41°5°. Typical 60°16° / 39°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 35°1°
  Dry
2. Afternoon
  noon–6 PM
  Mostly 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.
Night: Partly cloudy, with a low around 41.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
54°12°–56°13°
Low, likely
30°−1°–41°5°
Typical high / low
60°16° / 39°4°
Wind
7 mph11 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 63°17°, low 48°9°. Typical 59°15° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°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 63.
Night: Partly cloudy, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–63°17°
Low, likely
40°4°–48°9°
Typical high / low
59°15° / 39°4°
Wind
11 mph18 km/h, gusts 32 mph52 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 66°19°, low 43°6°. Typical 59°15° / 39°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 51°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: Mostly sunny, with a high near 66.
Night: Partly cloudy, with a low around 43.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–70°21°
Low, likely
43°6°–51°11°
Typical high / low
59°15° / 39°4°
Wind
8 mph14 km/h, gusts 20 mph32 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 65°18°, low 46°8°. Typical 58°14° / 38°3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 48°9°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–67°19°
Low, likely
44°7°–48°9°
Typical high / low
58°14° / 38°3°
Wind
7 mph12 km/h, gusts 26 mph42 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 65°18°, low 49°9°. Typical 58°14° / 38°3°. Rain, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°15°
  20% chance
4. Overnight
  midnight–6 AM
  Drizzle, 58°14°
  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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–68°20°
Low, likely
43°6°–54°12°
Typical high / low
58°14° / 38°3°
Wind
8 mph13 km/h, gusts 22 mph36 km/h
UV peak
4
Monday, Nov 2. Drizzle. High 65°18°, low 57°14°. Typical 58°14° / 38°3°. Rain 0.28 in7.1 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 60°15°
  30% chance · 0.06 in1.5 mm
2. Afternoon
  noon–6 PM
  Showers, 64°18°
  30% chance · 0.12 in3.1 mm
3. Evening
  6 PM–midnight
  Showers, 63°17°
  20% chance · 0.11 in2.9 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
62°17°–67°19°
Low, likely
52°11°–63°17°
Typical high / low
58°14° / 38°3°
Wind
15 mph24 km/h, gusts 29 mph47 km/h

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 33°.
Tomorrow
Dry, high 64°, low 37°, warming up.
Monday
Dry, high 67°, low 42°, 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)

2.6 mi

Below flood stage

Level: 1.8 ft

Forecast peak 4.3 ft Tue 10 AM

Reading from Sat 1 PM · NWS gauge page

Atlantic Coast at Watch Hill Cove (IN MLLW)

12 mi

Below flood stage

Level: 1.4 ft

Forecast peak 3.3 ft Sun 9 AM

Reading from Sat 1 PM · NWS gauge page

Pawcatuck at Westerly

12 mi

Below flood stage

Level: 4.3 ft
Flow: 413 cfs

Forecast peak 4.4 ft Sat 2 PM

Reading from Sat 1 PM · NWS gauge page

Yantic River at Yantic

12 mi

Below flood stage

Level: 2.0 ft
Flow: 88 cfs

Forecast peak 2.0 ft Sat 2 PM

Reading from Sat 12:45 PM · NWS gauge page

For your home

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

Heating this week

About 68% less heating than a typical week.

This week 34Typical 106

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 26
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 18 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 37°F).

Open the windows?

Today, 3:00 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

Conning Towers-Nautilus Park weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 43 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 33 min less
Golden hour: 5:15–6:11 PM; Morning 6:53–7:48 AM
Blue hour: 6:11–6:22 PM; Morning 6:42–6:53 AM; first light 6:42 AM

Stars tonight? Fair

Clear 6:22 PM–6:43 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

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

Looking south from Conning Towers-Nautilus Park. Water in view.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

Conning Towers-Nautilus Park, 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