Frost Advisory
Starts in 15 h 51 min
When
From 11 PM this evening to 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 33 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 6:25 AM EDT at KBDR

Norwalk, CT weather

Clear and 45°7°.

Forecasts agree

Now 45°7°

Clear

Wind: 3 mph5 km/h; From the north. 35–13 mph21 km/h through 7 PM
Dew point: 36°2°; Comfortable
UV index: 0Low; Moderate 12–3 PM · peak 3
Air today: 33Good; EPA forecast · PM2.5 (fine particles)
Pressure: 30.27 inHg1025 hPa; Rising · +0.09 inHg+3.0 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 (47°8° then, 45°7° now)

Good hours for

High 59°15° today at 4 PM
Below 50°10° tonight after 9 PM
Low 43°6° tonight at 4 AM
Above 50°10° tomorrow by 10 AM

This morningUp to 54°12° by 11 AM · Clear
This afternoonNear 58°14° · Clear
TonightDown to 43°6° by 4 AM · Partly cloudy
Tomorrow morningUp to 55°13° by 11 AM · Partly cloudy
Tomorrow afternoonNear 59°15° · Partly cloudy
Tomorrow nightDown to 43°6° by 5 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
Fri 7a	Sunny	46°8° (likely 42°6° to 47°8°)	40°4°	0%	13 mph21 km/h from N, gusts 16 mph26 km/h	73%	0%	0
Fri 8a	Sunny	48°9° (likely 43°6° to 48°9°)	43°6°	0%	13 mph21 km/h from N, gusts 17 mph28 km/h	65%	0%	0
Fri 9a	Sunny	49°9° (likely 47°8° to 49°9°)	44°7°	0%	12 mph19 km/h from N, gusts 17 mph28 km/h	61%	0%	0
Fri 10a	Sunny	53°12° (likely 51°11° to 53°12°)	53°12°	0%	10 mph16 km/h from NE, gusts 20 mph32 km/h	50%	0%	1
Fri 11a	Sunny	54°12° (likely 53°12° to 54°12°)	54°12°	0%	10 mph16 km/h from NE, gusts 18 mph30 km/h	47%	0%	2
Fri 12p	Sunny	56°13° (likely 55°13° to 56°13°)	56°13°	0%	9 mph14 km/h from NE, gusts 16 mph25 km/h	42%	0%	3
Fri 1p	Sunny	57°14° (likely 57°14° to 58°14°)	57°14°	0%	8 mph13 km/h from NE, gusts 14 mph22 km/h	40%	0%	3
Fri 2p	Sunny	57°14° (likely 57°14° to 60°16°)	57°14°	0%	7 mph11 km/h from NE, gusts 12 mph20 km/h	40%	0%	3
Fri 3p	Sunny	58°14° (likely 58°14° to 60°16°)	58°14°	0%	7 mph11 km/h from NE, gusts 10 mph17 km/h	39%	1%	2
Fri 4p	Sunny	59°15° (likely 59°15° to 61°16°)	59°15°	0%	6 mph10 km/h from NE, gusts 9 mph15 km/h	37%	0%	1
Fri 5p	Sunny	59°15° (likely 57°14° to 60°16°)	59°15°	0%	6 mph10 km/h from NE, gusts 8 mph13 km/h	39%	1%	0
Fri 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	6 mph10 km/h from NE, gusts 6 mph10 km/h	42%	5%	0
Fri 7p	Clear	56°13° (likely 51°11° to 56°13°)	56°13°	0%	7 mph11 km/h from N, gusts 5 mph8 km/h	45%	13%	0
Fri 8p	Clear	53°12° (likely 49°9° to 53°12°)	53°12°	0%	8 mph13 km/h from N, gusts 6 mph10 km/h	52%	18%	0
Fri 9p	Cloudy	49°9° (likely 46°8° to 50°10°)	46°8°	0%	7 mph11 km/h from N, gusts 6 mph10 km/h	61%	60%	0
Fri 10p	Cloudy	48°9° (likely 45°7° to 48°9°)	45°7°	0%	7 mph11 km/h from N, gusts 6 mph10 km/h	63%	57%	0
Fri 11p	Clear	47°8° (likely 43°6° to 47°8°)	44°7°	0%	7 mph11 km/h from N, gusts 7 mph11 km/h	65%	26%	0
Sat 12a	Partly cloudy	45°7° (likely 43°6° to 46°8°)	41°5°	0%	7 mph11 km/h from N, gusts 7 mph12 km/h	70%	38%	0
Sat 1a	Mostly clear	45°7° (likely 42°6° to 45°7°)	41°5°	0%	7 mph11 km/h from N, gusts 7 mph12 km/h	68%	43%	0
Sat 2a	Clear	44°7° (likely 40°4° to 45°7°)	40°4°	0%	7 mph11 km/h from N, gusts 8 mph13 km/h	70%	43%	0
Sat 3a	Mostly clear	44°7° (likely 40°4° to 44°7°)	40°4°	0%	7 mph11 km/h from N, gusts 8 mph12 km/h	70%	45%	0
Sat 4a	Mostly clear	43°6° (likely 39°4° to 44°7°)	39°4°	0%	7 mph11 km/h from N, gusts 7 mph12 km/h	70%	49%	0
Sat 5a	Partly cloudy	43°6° (likely 38°3° to 43°6°)	39°4°	0%	7 mph11 km/h from N, gusts 7 mph11 km/h	70%	55%	0
Sat 6a	Partly cloudy	43°6° (likely 38°3° to 43°6°)	39°4°	0%	7 mph11 km/h from N, gusts 7 mph12 km/h	70%	56%	0
Sat 7a	Partly sunny	42°6° (likely 37°3° to 42°6°)	38°3°	0%	6 mph10 km/h from N, gusts 7 mph12 km/h	73%	54%	0
Sat 8a	Partly sunny	44°7° (likely 38°3° to 44°7°)	41°5°	0%	6 mph10 km/h from N, gusts 7 mph11 km/h	68%	54%	0
Sat 9a	Partly sunny	46°8° (likely 43°6° to 46°8°)	44°7°	0%	5 mph8 km/h from N, gusts 6 mph10 km/h	63%	54%	1
Sat 10a	Mostly cloudy	52°11° (likely 49°9° to 52°11°)	52°11°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	52%	55%	2
Sat 11a	Partly sunny	55°13° (likely 53°12° to 56°13°)	55°13°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	47%	60%	2
Sat 12p	Partly sunny	57°14° (likely 55°13° to 58°14°)	57°14°	0%	3 mph5 km/h from NW, gusts 6 mph9 km/h	43%	54%	3
Sat 1p	Partly sunny	58°14° (likely 57°14° to 60°16°)	58°14°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	42%	53%	3
Sat 2p	Partly sunny	59°15° (likely 57°14° to 61°16°)	59°15°	0%	5 mph8 km/h from W, gusts 8 mph12 km/h	40%	53%	3
Sat 3p	Partly sunny	59°15° (likely 58°14° to 62°17°)	59°15°	0%	5 mph8 km/h from W, gusts 7 mph12 km/h	40%	49%	3
Sat 4p	Sunny	60°16° (likely 59°15° to 62°17°)	60°16°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	39%	44%	2
Sat 5p	Sunny	60°16° (likely 57°14° to 61°16°)	60°16°	0%	5 mph8 km/h from W, gusts 6 mph10 km/h	39%	35%	1
Sat 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	3 mph5 km/h from NW, gusts 5 mph8 km/h	44%	15%	0
Sat 7p	Clear	57°14° (likely 50°10° to 57°14°)	57°14°	0%	3 mph5 km/h from NW, gusts 5 mph8 km/h	45%	0%	0
Sat 8p	Clear	53°12° (likely 47°8° to 54°12°)	53°12°	0%	3 mph5 km/h from NW, gusts 4 mph7 km/h	54%	1%	0
Sat 9p	Clear	50°10° (likely 46°8° to 53°12°)	50°10°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	61%	0%	0
Sat 10p	Clear	48°9° (likely 45°7° to 52°11°)	48°9°	0%	2 mph3 km/h from NW, gusts 9 mph14 km/h	68%	0%	0
Sat 11p	Clear	47°8° (likely 44°7° to 51°11°)	46°8°	0%	3 mph5 km/h from NW, gusts 10 mph16 km/h	71%	0%	0
Sun 12a	Clear	46°8° (likely 43°6° to 48°9°)	45°7°	0%	3 mph5 km/h from NW, gusts 8 mph13 km/h	73%	0%	0
Sun 1a	Clear	45°7° (likely 43°6° to 46°8°)	44°7°	0%	3 mph5 km/h from NW, gusts 8 mph12 km/h	76%	0%	0
Sun 2a	Clear	45°7° (likely 40°4° to 46°8°)	44°7°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	76%	0%	0
Sun 3a	Clear	44°7° (likely 37°3° to 50°10°)	42°6°	0%	3 mph5 km/h from NW, gusts 4 mph7 km/h	76%	5%	0
Sun 4a	Clear	44°7° (likely 37°3° to 49°9°)	41°5°	0%	5 mph8 km/h from NW, gusts 4 mph7 km/h	76%	6%	0
Sun 5a	Clear	43°6° (likely 37°3° to 49°9°)	40°4°	0%	5 mph8 km/h from NW, gusts 5 mph7 km/h	76%	10%	0
Sun 6a	Clear	43°6° (likely 36°2° to 48°9°)	40°4°	0%	5 mph8 km/h from NW, gusts 5 mph7 km/h	76%	11%	0

Days ahead

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

Today, Oct 23. Sunny. High 59°15°, low 42°6°. Typical 60°16° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 43°6°
  Dry
Official NWS forecast
Today: Sunny, with a high near 59. Northeast wind 6 to 13 mph.
Tonight: Mostly clear, with a low around 42. North wind around 8 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–61°16°
Low, likely
42°6°–46°8°
Typical high / low
60°16° / 43°6°
Wind
11 mph18 km/h, gusts 33 mph53 km/h
UV peak
4
Tomorrow, Oct 24. Partly sunny. High 60°16°, low 43°6°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 60. Northwest wind 3 to 7 mph.
Night: Mostly clear, with a low around 43. Northwest wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–62°17°
Low, likely
37°3°–43°6°
Typical high / low
60°16° / 43°6°
Wind
7 mph11 km/h, gusts 17 mph27 km/h
UV peak
3
Sunday, Oct 25. Sunny. High 62°17°, low 45°7°. Typical 60°16° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 62. West wind around 5 mph.
Night: Clear. Low around 45, with temperatures rising to around 47 overnight.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–64°18°
Low, likely
38°3°–45°7°
Typical high / low
60°16° / 42°6°
Wind
6 mph10 km/h, gusts 11 mph18 km/h
UV peak
4
Monday, Oct 26. Sunny. High 66°19°, low 47°8°. Typical 59°15° / 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, 58°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  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 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–68°20°
Low, likely
38°3°–47°8°
Typical high / low
59°15° / 42°6°
Wind
8 mph12 km/h, gusts 15 mph23 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 59°15°, low 41°5°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 59.
Night: Mostly clear, with a low around 41.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–60°16°
Low, likely
41°5°–53°12°
Typical high / low
59°15° / 42°6°
Wind
13 mph21 km/h, gusts 27 mph44 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 56°13°, low 45°7°. Typical 59°15° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°11°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 56.
Night: Mostly cloudy, with a low around 45.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
55°13°–57°14°
Low, likely
40°4°–50°10°
Typical high / low
59°15° / 42°6°
Wind
9 mph15 km/h
UV peak
3
Thursday, Oct 29. Partly sunny. High 62°17°, low 48°9°. Typical 58°14° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 62.
Night: Partly cloudy, with a low around 48.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–67°19°
Low, likely
48°9°–53°12°
Typical high / low
58°14° / 41°5°
Wind
13 mph21 km/h, gusts 30 mph49 km/h
UV peak
4
Friday, Oct 30. Cloudy. High 66°19°, low 52°11°. Typical 58°14° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 50°10°
  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
64°18°–68°20°
Low, likely
47°8°–54°12°
Typical high / low
58°14° / 41°5°
Wind
12 mph19 km/h, gusts 21 mph34 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 59°15°, low 48°9°. Typical 58°14° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°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
54°12°–67°19°
Low, likely
41°5°–57°14°
Typical high / low
58°14° / 41°5°
Wind
11 mph18 km/h, gusts 26 mph41 km/h
UV peak
3
Sunday, Nov 1. Drizzle. High 61°16°, low 50°10°. Typical 57°14° / 40°4°. Rain 0.12 in3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  20% chance
3. Evening
  6 PM–midnight
  Drizzle, 53°12°
  30% chance · 0.08 in1.9 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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
56°13°–64°18°
Low, likely
36°2°–62°17°
Typical high / low
57°14° / 40°4°
Wind
21 mph34 km/h, gusts 36 mph58 km/h

10 days15 days30 days

The outlook

Today
Dry, high 59°, low 42°.
Tomorrow
Dry, high 60°, low 43°.
Sunday
Dry, high 62°, low 45°.
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

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 100

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 19
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at.

Comfort

Dry air outside (dew point 36°F).

Open the windows?

Sat, 4:00 PM–5:00 PM

Good stretch to open the windows (air quality forecast not available for part of this window).

Is this typical?

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

Oct 23, today vs a typical year

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

Last 7 days vs normal

On average 3°2° colder than normal (daily mean temperature).

−7°−4°SatOct 17
−7°−4°SunOct 18
−2°−1°MonOct 19
—TueOct 20
±0°WedOct 21
+1°ThuOct 22
—FriOct 23

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

Sun & moon

Sun

Daylight: 10 h 47 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 34 min less
Golden hour: 5:23–6:18 PM; Morning 6:56–7:52 AM
Blue hour: 6:18–6:29 PM; Morning 6:46–6:56 AM; first light 6:46 AM

Stars tonight? Fair

Mostly clear 6:29–9 PM, but the moon is 95% lit and up.

Moon

Waxing gibbous

91% lit · growing

Today: sets 4:16 AM · rises 4:33 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Norwalk. The highest point on the skyline is about 700 ft, 10 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