Frost Advisory
Starts in 8 h 36 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 3:00 PM EDT at KHVN

West Haven, CT weather

Sunny and 59°15°, jacket by 8 PM.

Mostly agree

Now 59°15°

Sunny

Wind: 6 mph9 km/h; From the southwest. Up to 6 mph9 km/h through 3 AM
Dew point: 41°5°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air quality: 22Good; PM2.5 (fine particles) · tomorrow moderate
Pressure: 30.51 inHg1033 hPa; Falling · −0.04 inHg−1.5 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Below 50°10° tonight after 9 PM
Low 38°3° tonight at 5 AM
Above 50°10° tomorrow by 10 AM

This afternoonNear 61°16° · Partly cloudy
TonightDown to 38°3° by 5 AM · Clear
Tomorrow morningUp to 55°13° by 11 AM · Clear
Tomorrow afternoonUp to 63°17° by 3 PM · Clear
Tomorrow nightDown to 41°5° by 4 AM · Clear
Monday morningUp to 56°13° by 11 AM · Clear
Monday afternoonUp to 64°18° by 2 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
Sat 3p	Partly sunny	61°16° (likely 58°14° to 62°17°)	61°16°	0%	6 mph10 km/h from W, gusts 8 mph13 km/h	41%	64%	2
Sat 4p	Sunny	60°16° (likely 58°14° to 61°16°)	60°16°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	44%	43%	1
Sat 5p	Sunny	61°16° (likely 57°14° to 61°16°)	61°16°	0%	5 mph8 km/h from W, gusts 8 mph14 km/h	42%	42%	0
Sat 6p	Clear	58°14° (likely 53°12° to 58°14°)	58°14°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	47%	36%	0
Sat 7p	Mostly clear	56°13° (likely 49°9° to 56°13°)	56°13°	0%	3 mph5 km/h from NW, gusts 8 mph12 km/h	49%	29%	0
Sat 8p	Mostly clear	52°11° (likely 46°8° to 52°11°)	52°11°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	56%	13%	0
Sat 9p	Clear	48°9° (likely 44°7° to 50°10°)	48°9°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	63%	5%	0
Sat 10p	Clear	46°8° (likely 43°6° to 49°9°)	46°8°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	68%	0%	0
Sat 11p	Clear	44°7° (likely 43°6° to 47°8°)	44°7°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	73%	0%	0
Sun 12a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	2 mph3 km/h from NW, gusts 7 mph12 km/h	76%	0%	0
Sun 1a	Clear	41°5° (likely 40°4° to 45°7°)	41°5°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	79%	0%	0
Sun 2a	Clear	40°4° (likely 37°3° to 45°7°)	40°4°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	82%	0%	0
Sun 3a	Clear	39°4° (likely 36°2° to 44°7°)	39°4°	0%	2 mph3 km/h from N, gusts 8 mph12 km/h	82%	0%	0
Sun 4a	Clear	39°4° (likely 35°2° to 43°6°)	37°3°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	82%	0%	0
Sun 5a	Clear	38°3° (likely 34°1° to 42°6°)	36°2°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	85%	0%	0
Sun 6a	Clear	38°3° (likely 34°1° to 41°5°)	36°2°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	85%	0%	0
Sun 7a	Sunny	39°4° (likely 33°1° to 41°5°)	37°3°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	82%	0%	0
Sun 8a	Sunny	39°4° (likely 34°1° to 41°5°)	37°3°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	85%	0%	0
Sun 9a	Sunny	44°7° (likely 41°5° to 46°8°)	42°6°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	73%	0%	1
Sun 10a	Sunny	51°11° (likely 49°9° to 53°12°)	51°11°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	61%	0%	2
Sun 11a	Sunny	55°13° (likely 55°13° to 57°14°)	55°13°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	55%	0%	3
Sun 12p	Sunny	59°15° (likely 58°14° to 61°16°)	59°15°	0%	3 mph5 km/h from NW, gusts 5 mph8 km/h	49%	0%	4
Sun 1p	Sunny	61°16° (likely 60°16° to 63°17°)	61°16°	0%	5 mph8 km/h from SW, gusts 6 mph9 km/h	46%	0%	4
Sun 2p	Sunny	62°17° (likely 60°16° to 65°18°)	62°17°	0%	6 mph10 km/h from S, gusts 7 mph12 km/h	46%	0%	4
Sun 3p	Sunny	63°17° (likely 60°16° to 65°18°)	63°17°	0%	6 mph10 km/h from S, gusts 8 mph13 km/h	44%	0%	3
Sun 4p	Sunny	62°17° (likely 60°16° to 64°18°)	62°17°	0%	6 mph10 km/h from SW, gusts 9 mph14 km/h	46%	0%	2
Sun 5p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	48%	0%	1
Sun 6p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	3 mph5 km/h from SW, gusts 9 mph14 km/h	53%	0%	0
Sun 7p	Clear	55°13° (likely 52°11° to 55°13°)	55°13°	0%	3 mph5 km/h from SW, gusts 8 mph13 km/h	61%	0%	0
Sun 8p	Clear	52°11° (likely 50°10° to 54°12°)	52°11°	0%	2 mph3 km/h from SW, gusts 8 mph13 km/h	71%	0%	0
Sun 9p	Clear	50°10° (likely 48°9° to 53°12°)	50°10°	0%	2 mph3 km/h from W, gusts 10 mph16 km/h	77%	0%	0
Sun 10p	Clear	48°9° (likely 48°9° to 52°11°)	48°9°	0%	2 mph3 km/h from W, gusts 12 mph19 km/h	80%	0%	0
Sun 11p	Clear	47°8° (likely 46°8° to 51°11°)	47°8°	0%	2 mph3 km/h from W, gusts 12 mph20 km/h	83%	0%	0
Mon 12a	Clear	46°8° (likely 45°7° to 50°10°)	46°8°	0%	2 mph3 km/h from W, gusts 12 mph19 km/h	86%	1%	0
Mon 1a	Clear	44°7° (likely 44°7° to 50°10°)	42°6°	0%	3 mph5 km/h from W, gusts 10 mph16 km/h	89%	0%	0
Mon 2a	Clear	43°6° (likely 42°6° to 49°9°)	41°5°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	93%	0%	0
Mon 3a	Clear	42°6° (likely 42°6° to 48°9°)	40°4°	0%	3 mph5 km/h from W, gusts 12 mph19 km/h	93%	0%	0
Mon 4a	Clear	41°5° (likely 40°4° to 48°9°)	39°4°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	96%	0%	0
Mon 5a	Clear	41°5° (likely 40°4° to 47°8°)	39°4°	0%	3 mph5 km/h from W, gusts 11 mph18 km/h	96%	1%	0
Mon 6a	Clear	39°4° (likely 39°4° to 46°8°)	37°3°	0%	3 mph5 km/h from W, gusts 10 mph16 km/h	100%	1%	0
Mon 7a	Sunny	40°4° (likely 39°4° to 45°7°)	37°3°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	96%	13%	0
Mon 8a	Sunny	41°5° (likely 39°4° to 46°8°)	38°3°	0%	5 mph8 km/h from W, gusts 8 mph14 km/h	93%	14%	0
Mon 9a	Sunny	44°7° (likely 42°6° to 50°10°)	41°5°	0%	5 mph8 km/h from W, gusts 6 mph9 km/h	86%	16%	1
Mon 10a	Mostly sunny	50°10° (likely 50°10° to 56°13°)	48°9°	0%	6 mph10 km/h from W, gusts 7 mph12 km/h	74%	12%	2
Mon 11a	Sunny	56°13° (likely 55°13° to 60°16°)	56°13°	0%	6 mph10 km/h from W, gusts 9 mph15 km/h	66%	7%	3
Mon 12p	Sunny	60°16° (likely 58°14° to 64°18°)	60°16°	0%	7 mph11 km/h from W, gusts 10 mph16 km/h	60%	16%	4
Mon 1p	Sunny	63°17° (likely 60°16° to 66°19°)	63°17°	0%	8 mph13 km/h from W, gusts 11 mph17 km/h	58%	4%	4
Mon 2p	Sunny	64°18° (likely 62°17° to 67°19°)	64°18°	0%	9 mph14 km/h from W, gusts 12 mph19 km/h	58%	2%	4

Days ahead

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

Today, Oct 24. Cloudy. High 61°16°, low 37°3°. Typical 62°17° / 45°7°. Dry. Mostly agree.
1. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
2. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Today: Mostly sunny, with a high near 61. West wind around 6 mph.
Tonight: Patchy frost after 5am. Mostly clear, with a low around 37. Northwest wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
58°14°–62°17°
Low, likely
34°1°–38°3°
Typical high / low
62°17° / 45°7°
Wind
8 mph12 km/h, gusts 13 mph22 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 63°17°, low 39°4°. Typical 61°16° / 45°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 39°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Day: Patchy frost before 7am. Sunny. High near 63, with temperatures falling to around 61 in the afternoon. West wind 2 to 6 mph.
Night: Mostly clear. Low around 39, with temperatures rising to around 41 overnight. West wind around 3 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–65°18°
Low, likely
33°1°–41°5°
Typical high / low
61°16° / 45°7°
Wind
8 mph12 km/h, gusts 18 mph29 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 66°19°, low 47°8°. Typical 61°16° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°10°
  Dry
Official NWS forecast
Day: Sunny, with a high near 66. West wind 3 to 9 mph.
Night: Mostly clear. Low around 47, with temperatures rising to around 49 overnight.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–68°20°
Low, likely
38°3°–47°8°
Typical high / low
61°16° / 45°7°
Wind
9 mph14 km/h, gusts 19 mph31 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 60°16°, low 38°3°. Typical 60°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 39°4°
  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
55°13°–60°16°
Low, likely
38°3°–46°8°
Typical high / low
60°16° / 44°7°
Wind
11 mph17 km/h, gusts 28 mph44 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 57°14°, low 45°7°. Typical 60°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 54°12°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 49°10°
  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
52°11°–57°14°
Low, likely
35°2°–45°7°
Typical high / low
60°16° / 44°7°
Wind
10 mph15 km/h, gusts 15 mph24 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 64°18°, low 51°11°. Typical 60°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 50°10°
  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, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly 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
46°8°–51°11°
Typical high / low
60°16° / 44°7°
Wind
10 mph16 km/h, gusts 20 mph33 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 68°20°, low 49°9°. Typical 59°15° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–71°22°
Low, likely
48°9°–54°12°
Typical high / low
59°15° / 43°6°
Wind
9 mph15 km/h, gusts 26 mph42 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 63°17°, low 49°9°. Typical 59°15° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 55°13°
  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
60°16°–67°19°
Low, likely
48°9°–51°11°
Typical high / low
59°15° / 43°6°
Wind
9 mph15 km/h, gusts 25 mph41 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 63°17°, low 54°12°. Typical 59°15° / 43°6°. Rain 0.01 in0.3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 60°16°
  30% chance · 0.01 in0.3 mm
4. Overnight
  midnight–6 AM
  Showers, 60°15°
  40% chance · 0.05 in1.4 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
57°14°–67°19°
Low, likely
50°10°–57°14°
Typical high / low
59°15° / 43°6°
Wind
10 mph15 km/h, gusts 25 mph40 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 65°18°, low 59°15°. Typical 58°14° / 42°6°. Rain 0.83 in21 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Showers, 61°16°
  40% chance · 0.34 in8.6 mm
2. Afternoon
  noon–6 PM
  Showers, 64°18°
  30% chance · 0.27 in6.8 mm
3. Evening
  6 PM–midnight
  Drizzle, 63°17°
  30% chance · 0.39 in9.8 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–68°20°
Low, likely
55°13°–64°18°
Typical high / low
58°14° / 42°6°
Wind
19 mph30 km/h, gusts 28 mph45 km/h

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 37°.
Tomorrow
Dry, high 63°, low 39°.
Monday
Dry, high 66°, low 47°, 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

Rivers

NOAA river gauges within 25 mi

Lake Maltby above Maltby Lake #3

2.3 mi

Level: 0.0 ft

Reading from Sat 1:37 PM · NWS gauge page

Lake Maltby above Maltby Lake #1

2.3 mi

Level: 0.1 ft

Reading from Sat 1:37 PM · NWS gauge page

Lake Maltby above Maltby Lake #2

2.5 mi

Level: 0.1 ft

Reading from Sat 1:37 PM · NWS gauge page

Long Island Sound at New Haven (IN MLLW)

3.2 mi

Below flood stage

Level: 3.3 ft

Reading from Sat 2 PM · NWS gauge page

For your home

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

Heating this week

About 66% less heating than a typical week.

This week 31Typical 89

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 23
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 41°F).

Open the windows?

Today, 4:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Igor I Sikorsky Memorial Airport · 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).

−8°−4°SunOct 18
−3°−2°MonOct 19
±0°TueOct 20
+2°+1°WedOct 21
+2°+1°ThuOct 22
−2°−1°FriOct 23
—SatOct 24

West Haven 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 32 min less
Golden hour: 5:19–6:14 PM; Morning 6:56–7:52 AM
Blue hour: 6:14–6:25 PM; Morning 6:45–6:56 AM; first light 6:45 AM

Stars tonight? Fair

Clear 8 PM–6:46 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:24 AM · rises 4:54 PM
Full moon: Oct 26
New moon: Nov 9

Looking south from West Haven. The highest point on the skyline is about 700 ft, 14 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

West Haven, CT weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Lake Maltby above Maltby Lake #3

Lake Maltby above Maltby Lake #1

Lake Maltby above Maltby Lake #2

Long Island Sound at New Haven (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? Fair

Moon