Frost Advisory
Starts in 15 h 52 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 6:35 AM EDT at KHPN

Stamford, CT weather

Clear and 43°6°.

Forecasts agree

Now 43°6°

Clear · Feels like 38°3°

Wind: 8 mph13 km/h; From the north-northwest. 35–8 mph13 km/h through 7 PM
Dew point: 37°3°; 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+2.9 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 (43°6° then, 43°6° now)

Good hours for

Above 50°10° today by 10 AM
High 58°14° today at 2 PM
Below 50°10° tonight after 8 PM
Low 37°3° tonight at 3 AM

This morningUp to 53°12° by 11 AM · Clear
This afternoonNear 57°14° · Clear
TonightDown to 37°3° by 3 AM · Partly cloudy
Tomorrow morningUp to 55°13° by 11 AM · Partly cloudy
Tomorrow afternoonNear 58°14° · Partly cloudy
Tomorrow nightDown to 37°3° 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
Fri 7a	Sunny	42°6° (likely 42°6° to 44°7°)	38°3°	0%	7 mph11 km/h from N, gusts 16 mph25 km/h	76%	0%	0
Fri 8a	Sunny	41°5° (likely 41°5° to 45°7°)	36°2°	0%	7 mph11 km/h from N, gusts 16 mph25 km/h	76%	0%	0
Fri 9a	Sunny	46°8° (likely 46°8° to 48°9°)	42°6°	0%	7 mph11 km/h from N, gusts 18 mph29 km/h	60%	0%	0
Fri 10a	Sunny	51°11° (likely 50°10° to 52°11°)	51°11°	0%	7 mph11 km/h from NE, gusts 19 mph31 km/h	50%	0%	1
Fri 11a	Sunny	53°12° (likely 53°12° to 54°12°)	53°12°	0%	7 mph11 km/h from NE, gusts 18 mph29 km/h	45%	0%	2
Fri 12p	Sunny	56°13° (likely 55°13° to 56°13°)	56°13°	0%	7 mph11 km/h from N, gusts 15 mph24 km/h	38%	0%	3
Fri 1p	Sunny	57°14° (likely 57°14° to 58°14°)	57°14°	0%	6 mph10 km/h from N, gusts 13 mph21 km/h	35%	0%	3
Fri 2p	Sunny	58°14° (likely 58°14° to 59°15°)	58°14°	0%	6 mph10 km/h from N, gusts 11 mph18 km/h	34%	1%	3
Fri 3p	Sunny	58°14° (likely 58°14° to 60°16°)	58°14°	0%	5 mph8 km/h from N, gusts 11 mph17 km/h	34%	3%	2
Fri 4p	Sunny	58°14° (likely 58°14° to 60°16°)	58°14°	0%	5 mph8 km/h from N, gusts 10 mph16 km/h	34%	1%	1
Fri 5p	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	5 mph8 km/h from N, gusts 9 mph15 km/h	37%	0%	0
Fri 6p	Clear	54°12° (likely 53°12° to 54°12°)	54°12°	0%	3 mph5 km/h from N, gusts 7 mph10 km/h	43%	5%	0
Fri 7p	Clear	51°11° (likely 49°9° to 51°11°)	51°11°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	50%	13%	0
Fri 8p	Mostly clear	45°7° (likely 45°7° to 48°9°)	43°6°	0%	5 mph8 km/h from N, gusts 8 mph13 km/h	63%	27%	0
Fri 9p	Cloudy	43°6° (likely 43°6° to 47°8°)	41°5°	0%	3 mph5 km/h from N, gusts 8 mph14 km/h	67%	60%	0
Fri 10p	Cloudy	41°5° (likely 41°5° to 45°7°)	39°4°	0%	3 mph5 km/h from N, gusts 8 mph12 km/h	70%	53%	0
Fri 11p	Partly cloudy	40°4° (likely 40°4° to 44°7°)	38°3°	0%	3 mph5 km/h from N, gusts 8 mph12 km/h	73%	31%	0
Sat 12a	Partly cloudy	39°4° (likely 39°4° to 43°6°)	37°3°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	76%	43%	0
Sat 1a	Mostly clear	38°3° (likely 38°3° to 42°6°)	36°2°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	79%	45%	0
Sat 2a	Mostly clear	38°3° (likely 38°3° to 42°6°)	36°2°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	79%	44%	0
Sat 3a	Mostly clear	37°3° (likely 37°3° to 41°5°)	34°1°	0%	3 mph5 km/h from N, gusts 8 mph14 km/h	79%	45%	0
Sat 4a	Mostly clear	37°3° (likely 37°3° to 40°4°)	34°1°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	79%	51%	0
Sat 5a	Partly cloudy	37°3° (likely 36°2° to 40°4°)	34°1°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	75%	55%	0
Sat 6a	Partly cloudy	37°3° (likely 35°2° to 39°4°)	34°1°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	75%	55%	0
Sat 7a	Mostly sunny	36°2° (likely 35°2° to 39°4°)	33°1°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	82%	55%	0
Sat 8a	Partly sunny	37°3° (likely 35°2° to 40°4°)	34°1°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	79%	54%	0
Sat 9a	Partly sunny	42°6° (likely 42°6° to 44°7°)	40°4°	0%	3 mph5 km/h from N, gusts 6 mph9 km/h	65%	61%	1
Sat 10a	Mostly cloudy	51°11° (likely 49°9° to 52°11°)	51°11°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	48%	51%	2
Sat 11a	Partly sunny	55°13° (likely 53°12° to 56°13°)	55°13°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	41%	63%	2
Sat 12p	Partly sunny	57°14° (likely 55°13° to 59°15°)	57°14°	0%	3 mph5 km/h from NW, gusts 7 mph12 km/h	38%	44%	3
Sat 1p	Partly sunny	59°15° (likely 57°14° to 61°16°)	59°15°	0%	3 mph5 km/h from NW, gusts 8 mph12 km/h	36%	57%	3
Sat 2p	Partly sunny	60°16° (likely 58°14° to 62°17°)	60°16°	0%	3 mph5 km/h from W, gusts 8 mph12 km/h	35%	52%	3
Sat 3p	Partly sunny	59°15° (likely 59°15° to 63°17°)	59°15°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	36%	48%	3
Sat 4p	Sunny	60°16° (likely 59°15° to 62°17°)	60°16°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	35%	43%	2
Sat 5p	Sunny	59°15° (likely 57°14° to 61°16°)	59°15°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	36%	40%	1
Sat 6p	Clear	55°13° (likely 53°12° to 55°13°)	55°13°	0%	2 mph3 km/h from NW, gusts 5 mph7 km/h	43%	23%	0
Sat 7p	Clear	52°11° (likely 50°10° to 52°11°)	52°11°	0%	1 mph2 km/h from NW, gusts 4 mph6 km/h	48%	3%	0
Sat 8p	Clear	45°7° (likely 45°7° to 51°11°)	45°7°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	65%	1%	0
Sat 9p	Clear	43°6° (likely 43°6° to 50°10°)	43°6°	0%	1 mph2 km/h from NW, gusts 6 mph10 km/h	70%	0%	0
Sat 10p	Clear	42°6° (likely 42°6° to 49°9°)	42°6°	0%	1 mph2 km/h from NW, gusts 8 mph12 km/h	73%	0%	0
Sat 11p	Clear	41°5° (likely 41°5° to 48°9°)	41°5°	0%	1 mph2 km/h from NW, gusts 9 mph14 km/h	76%	0%	0
Sun 12a	Clear	40°4° (likely 40°4° to 45°7°)	40°4°	0%	1 mph2 km/h from NW, gusts 8 mph13 km/h	79%	0%	0
Sun 1a	Clear	39°4° (likely 39°4° to 44°7°)	39°4°	0%	2 mph3 km/h from NW, gusts 7 mph12 km/h	85%	0%	0
Sun 2a	Clear	38°3° (likely 38°3° to 45°7°)	38°3°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	89%	0%	0
Sun 3a	Clear	37°3° (likely 37°3° to 46°8°)	37°3°	0%	2 mph3 km/h from NW, gusts 5 mph7 km/h	89%	0%	0
Sun 4a	Clear	37°3° (likely 36°2° to 46°8°)	37°3°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	85%	0%	0
Sun 5a	Clear	37°3° (likely 36°2° to 45°7°)	37°3°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	82%	0%	0
Sun 6a	Clear	37°3° (likely 35°2° to 45°7°)	37°3°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	82%	0%	0

Days ahead

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

Today, Oct 23. Sunny. High 58°14°, low 35°2°. Typical 60°16° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°14°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 37°3°
  Dry
Official NWS forecast
Today: Sunny, with a high near 58. North wind around 7 mph.
Tonight: Areas of frost after 4am. Mostly clear. Low around 35, with temperatures rising to around 37 overnight. North wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
58°14°–60°16°
Low, likely
35°2°–43°6°
Typical high / low
60°16° / 43°6°
Wind
10 mph16 km/h, gusts 30 mph49 km/h
UV peak
4
Tomorrow, Oct 24. Partly sunny. High 60°16°, low 36°2°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Mostly sunny, with a high near 60. Northwest wind around 3 mph.
Night: Patchy frost after 5am. Mostly clear, with a low around 36. Northwest wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–63°17°
Low, likely
35°2°–39°4°
Typical high / low
60°16° / 43°6°
Wind
6 mph10 km/h, gusts 14 mph23 km/h
UV peak
3
Sunday, Oct 25. Sunny. High 63°17°, low 39°4°. Typical 60°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy frost before 8am. Sunny. High near 63, with temperatures falling to around 61 in the afternoon. West wind around 3 mph.
Night: Clear. Low around 39, with temperatures rising to around 41 overnight.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–65°18°
Low, likely
35°2°–43°6°
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 68°20°, low 45°7°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 68.
Night: Clear, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–69°21°
Low, likely
35°2°–45°7°
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 60°16°, low 38°3°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 42°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 60.
Night: Mostly clear, with a low around 38.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–62°17°
Low, likely
38°3°–49°9°
Typical high / low
59°15° / 42°6°
Wind
10 mph17 km/h, gusts 27 mph44 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 57°14°, low 41°5°. Typical 59°15° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 56°14°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 51°10°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 57.
Night: Mostly cloudy, with a low around 41.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
56°13°–57°14°
Low, likely
35°2°–47°8°
Typical high / low
59°15° / 42°6°
Wind
8 mph12 km/h, gusts 14 mph22 km/h
UV peak
3
Thursday, Oct 29. Partly sunny. High 62°17°, low 45°7°. Typical 58°14° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 51°11°
  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 45.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–67°19°
Low, likely
45°7°–49°9°
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 50°10°. Typical 58°14° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 49°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°–69°21°
Low, likely
46°8°–52°11°
Typical high / low
58°14° / 41°5°
Wind
10 mph15 km/h, gusts 21 mph34 km/h
UV peak
3
Saturday, Oct 31. Cloudy. High 59°15°, low 47°8°. Typical 58°14° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  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
53°12°–68°20°
Low, likely
40°4°–55°13°
Typical high / low
58°14° / 41°5°
Wind
10 mph16 km/h, gusts 26 mph41 km/h
UV peak
3
Sunday, Nov 1. Drizzle. High 61°16°, low 49°9°. Typical 57°14° / 40°4°. Rain 0.12 in3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  20% chance
3. Evening
  6 PM–midnight
  Drizzle, 52°11°
  30% 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
56°13°–64°18°
Low, likely
36°2°–62°17°
Typical high / low
57°14° / 40°4°
Wind
16 mph25 km/h, gusts 36 mph58 km/h

10 days15 days30 days

The outlook

Today
Dry, high 58°, low 35°.
Tomorrow
Dry, high 60°, low 36°.
Sunday
Dry, high 63°, low 39°, warming up.
Rest of week
Mostly dry, highs 57–68°.

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 64% less heating than a typical week.

This week 36Typical 100

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 27
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 7 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 37°F).

Open the windows?

No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.

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 2°1° colder than typical.

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

Stamford 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 6:57–7:52 AM
Blue hour: 6:18–6:29 PM; Morning 6:46–6:57 AM; first light 6:46 AM

Stars tonight? Fair

Mostly clear 6:29–8 PM, but the moon is 95% lit and up.

Moon

Waxing gibbous

91% lit · growing

Today: sets 4:17 AM · rises 4:33 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Stamford. The highest point on the skyline is about 1,100 ft, 16 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