Frost Advisory
Ends in 3 h 31 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 5:10 AM EDT at KHPN

Noroton, CT weather

Clear and 39°4°.

Forecasts agree

Now 39°4°

Clear · Feels like 34°1°

Wind: 7 mph11 km/h; From the west-northwest. 35–7 mph11 km/h through 5 PM
Dew point: 30°−1°; Dry · up to 39°4° by 10 AM (comfortable)
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air today: 50Good; EPA forecast · PM2.5 (fine particles)
Pressure: 30.49 inHg1033 hPa; Rising slowly · +0.03 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 39°4° today at 6 AM
Above 50°10° today by 10 AM
High 60°16° today at 2 PM
Below 50°10° tonight after 9 PM

This morningUp to 55°13° by 11 AM · Partly cloudy
This afternoonNear 59°15° · Mostly cloudy
TonightDown to 41°5° by 5 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 64°18° by 4 PM · Clear
Tomorrow nightDown to 43°6° by 3 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	Partly cloudy	40°4° (likely 38°3° to 42°6°)	37°3°	0%	5 mph8 km/h from N, gusts 10 mph16 km/h	82%	15%	0
Sat 6a	Clear	39°4° (likely 37°3° to 42°6°)	36°2°	0%	5 mph8 km/h from N, gusts 10 mph16 km/h	85%	28%	0
Sat 7a	Sunny	40°4° (likely 36°2° to 42°6°)	37°3°	0%	5 mph8 km/h from N, gusts 9 mph15 km/h	82%	37%	0
Sat 8a	Mostly cloudy	40°4° (likely 37°3° to 43°6°)	37°3°	0%	5 mph8 km/h from N, gusts 9 mph14 km/h	85%	67%	0
Sat 9a	Cloudy	44°7° (likely 42°6° to 47°8°)	44°7°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	79%	79%	1
Sat 10a	Cloudy	50°10° (likely 47°8° to 51°11°)	50°10°	0%	3 mph5 km/h from N, gusts 5 mph7 km/h	66%	80%	2
Sat 11a	Cloudy	55°13° (likely 51°11° to 56°13°)	55°13°	0%	3 mph5 km/h from N, gusts 6 mph9 km/h	55%	80%	3
Sat 12p	Cloudy	57°14° (likely 54°12° to 58°14°)	57°14°	0%	3 mph5 km/h from W, gusts 6 mph9 km/h	53%	80%	3
Sat 1p	Cloudy	59°15° (likely 56°13° to 60°16°)	59°15°	0%	3 mph5 km/h from SW, gusts 6 mph10 km/h	49%	80%	4
Sat 2p	Cloudy	60°16° (likely 58°14° to 61°16°)	60°16°	0%	5 mph8 km/h from SW, gusts 7 mph11 km/h	44%	70%	4
Sat 3p	Mostly cloudy	60°16° (likely 59°15° to 62°17°)	60°16°	0%	5 mph8 km/h from SW, gusts 7 mph11 km/h	44%	61%	3
Sat 4p	Partly sunny	60°16° (likely 59°15° to 61°16°)	60°16°	0%	5 mph8 km/h from SW, gusts 7 mph11 km/h	44%	57%	2
Sat 5p	Partly sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	46%	50%	1
Sat 6p	Mostly clear	57°14° (likely 53°12° to 57°14°)	57°14°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	53%	44%	0
Sat 7p	Clear	54°12° (likely 50°10° to 54°12°)	54°12°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	61%	41%	0
Sat 8p	Clear	52°11° (likely 46°8° to 53°12°)	52°11°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	66%	32%	0
Sat 9p	Clear	49°9° (likely 44°7° to 52°11°)	49°9°	0%	2 mph3 km/h from NW, gusts 4 mph6 km/h	71%	12%	0
Sat 10p	Clear	48°9° (likely 44°7° to 51°11°)	48°9°	0%	2 mph3 km/h from NW, gusts 4 mph7 km/h	71%	0%	0
Sat 11p	Clear	46°8° (likely 43°6° to 49°9°)	46°8°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	76%	0%	0
Sun 12a	Clear	45°7° (likely 42°6° to 46°8°)	45°7°	0%	2 mph3 km/h from NW, gusts 5 mph9 km/h	79%	0%	0
Sun 1a	Clear	44°7° (likely 42°6° to 45°7°)	44°7°	0%	2 mph3 km/h from NW, gusts 6 mph9 km/h	79%	0%	0
Sun 2a	Clear	43°6° (likely 41°5° to 44°7°)	43°6°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	82%	5%	0
Sun 3a	Clear	43°6° (likely 39°4° to 43°6°)	43°6°	0%	3 mph5 km/h from NW, gusts 6 mph9 km/h	82%	9%	0
Sun 4a	Clear	42°6° (likely 38°3° to 42°6°)	42°6°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	82%	10%	0
Sun 5a	Clear	41°5° (likely 38°3° to 42°6°)	41°5°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	85%	11%	0
Sun 6a	Clear	41°5° (likely 38°3° to 41°5°)	41°5°	0%	3 mph5 km/h from NW, gusts 7 mph12 km/h	82%	10%	0
Sun 7a	Sunny	41°5° (likely 37°3° to 41°5°)	41°5°	0%	3 mph5 km/h from NW, gusts 7 mph12 km/h	82%	9%	0
Sun 8a	Sunny	41°5° (likely 38°3° to 42°6°)	41°5°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	85%	9%	0
Sun 9a	Sunny	46°8° (likely 43°6° to 47°8°)	46°8°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	73%	0%	1
Sun 10a	Sunny	53°12° (likely 49°9° to 55°13°)	53°12°	0%	2 mph3 km/h from NW, gusts 4 mph7 km/h	61%	0%	2
Sun 11a	Sunny	57°14° (likely 55°13° to 60°16°)	57°14°	0%	2 mph3 km/h from NW, gusts 4 mph6 km/h	55%	0%	3
Sun 12p	Sunny	60°16° (likely 59°15° to 63°17°)	60°16°	0%	3 mph5 km/h from W, gusts 5 mph9 km/h	49%	0%	4
Sun 1p	Sunny	63°17° (likely 60°16° to 64°18°)	63°17°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	43%	0%	4
Sun 2p	Sunny	63°17° (likely 61°16° to 65°18°)	63°17°	0%	3 mph5 km/h from SW, gusts 7 mph11 km/h	43%	0%	4
Sun 3p	Sunny	63°17° (likely 62°17° to 66°19°)	63°17°	0%	3 mph5 km/h from SW, gusts 6 mph10 km/h	43%	0%	3
Sun 4p	Sunny	64°18° (likely 62°17° to 65°18°)	64°18°	0%	3 mph5 km/h from SW, gusts 6 mph10 km/h	41%	0%	2
Sun 5p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	3 mph5 km/h from SW, gusts 7 mph11 km/h	43%	0%	1
Sun 6p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	2 mph3 km/h from SW, gusts 7 mph11 km/h	51%	0%	0
Sun 7p	Clear	57°14° (likely 53°12° to 57°14°)	57°14°	0%	2 mph3 km/h from SW, gusts 8 mph14 km/h	57%	0%	0
Sun 8p	Clear	52°11° (likely 50°10° to 56°13°)	52°11°	0%	2 mph3 km/h from SW, gusts 9 mph14 km/h	69%	0%	0
Sun 9p	Clear	50°10° (likely 48°9° to 54°12°)	50°10°	0%	2 mph3 km/h from SW, gusts 10 mph15 km/h	74%	0%	0
Sun 10p	Clear	48°9° (likely 46°8° to 52°11°)	48°9°	0%	2 mph3 km/h from W, gusts 9 mph15 km/h	80%	0%	0
Sun 11p	Clear	47°8° (likely 45°7° to 50°10°)	47°8°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	79%	0%	0
Mon 12a	Clear	46°8° (likely 44°7° to 49°9°)	46°8°	0%	3 mph5 km/h from W, gusts 8 mph12 km/h	83%	0%	0
Mon 1a	Clear	45°7° (likely 42°6° to 49°9°)	43°6°	0%	5 mph8 km/h from W, gusts 8 mph13 km/h	82%	0%	0
Mon 2a	Clear	44°7° (likely 41°5° to 50°10°)	41°5°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	86%	0%	0
Mon 3a	Clear	43°6° (likely 40°4° to 53°12°)	40°4°	0%	5 mph8 km/h from W, gusts 5 mph7 km/h	89%	0%	0
Mon 4a	Clear	43°6° (likely 40°4° to 51°11°)	40°4°	0%	5 mph8 km/h from W, gusts 5 mph8 km/h	89%	0%	0

Days ahead

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

Today, Oct 24. Cloudy. High 61°16°, low 39°4°. Typical 60°16° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Mostly cloudy, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Today: Patchy frost before 9am. Partly sunny, with a high near 61. West wind around 5 mph.
Tonight: Partly cloudy, with a low around 39. North wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–62°17°
Low, likely
36°2°–42°6°
Typical high / low
60°16° / 43°6°
Wind
7 mph11 km/h, gusts 14 mph22 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 65°18°, low 41°5°. Typical 60°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  Dry
Official NWS forecast
Day: Sunny. High near 65, with temperatures falling to around 63 in the afternoon. West wind around 3 mph.
Night: Clear, with a low around 41. West wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–66°19°
Low, likely
37°3°–41°5°
Typical high / low
60°16° / 42°6°
Wind
8 mph13 km/h
UV peak
4
Monday, Oct 26. Sunny. High 68°20°, low 46°8°. Typical 59°15° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny. High near 68, with temperatures falling to around 66 in the afternoon.
Night: Mostly clear, with a low around 46.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–68°20°
Low, likely
41°5°–47°8°
Typical high / low
59°15° / 42°6°
Wind
8 mph14 km/h, gusts 16 mph26 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 57°14°, low 39°4°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  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 39.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–59°15°
Low, likely
39°4°–48°9°
Typical high / low
59°15° / 42°6°
Wind
14 mph22 km/h, gusts 29 mph47 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 57°14°, low 48°9°. Typical 59°15° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 51°10°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 57.
Night: Partly cloudy, with a low around 48.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
53°12°–58°14°
Low, likely
38°3°–48°9°
Typical high / low
59°15° / 42°6°
Wind
11 mph17 km/h, gusts 17 mph28 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 65°18°, low 52°11°. Typical 58°14° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 65.
Night: Partly cloudy, with a low around 52.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–66°19°
Low, likely
44°7°–52°11°
Typical high / low
58°14° / 41°5°
Wind
11 mph18 km/h, gusts 30 mph49 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 66°19°, low 50°10°. Typical 58°14° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 66.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–71°22°
Low, likely
49°9°–52°11°
Typical high / low
58°14° / 41°5°
Wind
12 mph19 km/h, gusts 30 mph48 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 67°19°, low 50°10°. Typical 58°14° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°15°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 53°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 differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–71°22°
Low, likely
48°9°–51°11°
Typical high / low
58°14° / 41°5°
Wind
12 mph19 km/h, gusts 26 mph42 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 65°18°, low 52°11°. Typical 57°14° / 40°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Drizzle, 57°14°
  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
56°13°–70°21°
Low, likely
49°9°–55°13°
Typical high / low
57°14° / 40°4°
Wind
9 mph14 km/h, gusts 21 mph33 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 65°18°, low 57°14°. Typical 57°14° / 40°4°. Rain 0.08 in2 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 59°15°
  20% chance · 0.02 in0.4 mm
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  20% chance · 0.01 in0.4 mm
3. Evening
  6 PM–midnight
  Mostly clear, 59°15°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–67°19°
Low, likely
55°13°–58°14°
Typical high / low
57°14° / 40°4°
Wind
10 mph15 km/h, gusts 20 mph33 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 39°.
Tomorrow
Dry, high 65°, low 41°, warming up.
Monday
Dry, high 68°, low 46°, warming up.
Rest of week
Mostly dry, highs 57–67°.

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 Bridgeport Harbor (IN MLLW)

18 mi

Below flood stage

Level: 1.5 ft

Forecast peak 8.5 ft Sat 10 AM

Reading from Sat 4:06 AM · NWS gauge page

Little Neck Bay at Kings Point (IN MLLW)

22 mi

Below flood stage

Level: 1.7 ft

Forecast peak 9.4 ft Mon 11 AM

Reading from Sat 4:06 AM · NWS gauge page

Rippowam River at Stamford

3.1 mi

Below flood stage

Level: 1.5 ft

Reading from Sat 3:45 AM · NWS gauge page

Long Island Sound at Stamford (IN MLLW)

3.2 mi

Below flood stage

Level: 1.4 ft

Reading from Sat 4 AM · 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 28Typical 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 8 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 30°F).

Open the windows?

Today, 2:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

WESTCHESTER CO AP · official normals 1991–2020 · records 1948–2026

Oct 24, today vs a typical year

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

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

−7°−4°SunOct 18
−2°−1°MonOct 19
—TueOct 20
±0°WedOct 21
+1°ThuOct 22
—FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 44 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 31 min less
Golden hour: 5:21–6:17 PM; Morning 6:58–7:53 AM
Blue hour: 6:17–6:28 PM; Morning 6:47–6:58 AM; first light 6:47 AM

Stars tonight? Poor

Clouds most of the night (about 22% cover).

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:26 AM · rises 4:56 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Noroton. The highest point on the skyline is about 1,100 ft, 13 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

Noroton, 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 Bridgeport Harbor (IN MLLW)

Little Neck Bay at Kings Point (IN MLLW)

Rippowam River at Stamford

Long Island Sound at Stamford (IN MLLW)

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? Poor

Moon