Frost Advisory
Starts in 7 h 46 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 3:50 PM EDT at KFOK

Riverhead, NY weather

Sunny and 61°16°, jacket by 6 PM.

Forecasts agree

Now 61°16°

Sunny

Wind: 7 mph11 km/h; From the west-northwest. Up to 7 mph11 km/h through 4 AM
Dew point: 37°3°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air today: 39Good; EPA forecast · PM2.5 (fine particles)
Pressure: 30.52 inHg1034 hPa; Falling slowly · −0.03 inHg−1.2 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 8 PM
Low 35°2° tonight at 5 AM
Above 50°10° tomorrow by 11 AM

This afternoonNear 59°15° · Partly cloudy
TonightDown to 35°2° by 5 AM · Clear
Tomorrow morningUp to 51°11° by 11 AM · Clear
Tomorrow afternoonUp to 61°16° by 4 PM · Clear
Tomorrow nightDown to 39°4° by 4 AM · Clear
Monday morningUp to 54°12° by 11 AM · Clear
Monday afternoonUp to 63°17° by 3 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 4p	Sunny	58°14° (likely 57°14° to 58°14°)	58°14°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	45%	48%	1
Sat 5p	Sunny	59°15° (likely 56°13° to 59°15°)	59°15°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	44%	41%	0
Sat 6p	Clear	55°13° (likely 51°11° to 56°13°)	55°13°	0%	2 mph3 km/h from W, gusts 8 mph12 km/h	51%	38%	0
Sat 7p	Mostly clear	51°11° (likely 49°9° to 55°13°)	51°11°	0%	2 mph3 km/h from W, gusts 8 mph13 km/h	61%	26%	0
Sat 8p	Clear	49°9° (likely 47°8° to 54°12°)	49°9°	0%	1 mph2 km/h from W, gusts 8 mph12 km/h	66%	16%	0
Sat 9p	Mostly clear	44°7° (likely 44°7° to 53°12°)	44°7°	0%	1 mph2 km/h from W, gusts 8 mph13 km/h	79%	12%	0
Sat 10p	Clear	43°6° (likely 43°6° to 52°11°)	43°6°	0%	1 mph2 km/h from W, gusts 7 mph11 km/h	79%	8%	0
Sat 11p	Clear	42°6° (likely 42°6° to 51°11°)	42°6°	0%	1 mph2 km/h from W, gusts 7 mph11 km/h	82%	3%	0
Sun 12a	Clear	41°5° (likely 41°5° to 50°10°)	41°5°	0%	1 mph2 km/h from W, gusts 7 mph11 km/h	82%	5%	0
Sun 1a	Clear	40°4° (likely 40°4° to 50°10°)	40°4°	0%	1 mph2 km/h from NW, gusts 7 mph12 km/h	82%	7%	0
Sun 2a	Clear	39°4° (likely 39°4° to 49°9°)	39°4°	0%	1 mph2 km/h from NW, gusts 8 mph12 km/h	85%	8%	0
Sun 3a	Clear	37°3° (likely 37°3° to 49°9°)	37°3°	0%	1 mph2 km/h from NW, gusts 7 mph12 km/h	92%	6%	0
Sun 4a	Clear	36°2° (likely 36°2° to 49°9°)	36°2°	0%	2 mph3 km/h from NW, gusts 7 mph12 km/h	92%	3%	0
Sun 5a	Clear	35°2° (likely 35°2° to 49°9°)	35°2°	0%	2 mph3 km/h from NW, gusts 7 mph12 km/h	96%	1%	0
Sun 6a	Clear	36°2° (likely 36°2° to 48°9°)	36°2°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	96%	0%	0
Sun 7a	Sunny	37°3° (likely 37°3° to 48°9°)	37°3°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	96%	0%	0
Sun 8a	Sunny	39°4° (likely 39°4° to 48°9°)	39°4°	0%	2 mph3 km/h from N, gusts 5 mph9 km/h	92%	0%	0
Sun 9a	Sunny	46°8° (likely 46°8° to 50°10°)	46°8°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	73%	0%	1
Sun 10a	Sunny	48°9° (likely 48°9° to 56°13°)	47°8°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	71%	0%	2
Sun 11a	Sunny	51°11° (likely 51°11° to 58°14°)	51°11°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	66%	0%	3
Sun 12p	Sunny	55°13° (likely 55°13° to 60°16°)	55°13°	0%	3 mph5 km/h from NW, gusts 8 mph13 km/h	57%	0%	4
Sun 1p	Sunny	57°14° (likely 57°14° to 62°17°)	57°14°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	51%	0%	4
Sun 2p	Sunny	59°15° (likely 58°14° to 63°17°)	59°15°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	47%	0%	4
Sun 3p	Sunny	60°16° (likely 59°15° to 63°17°)	60°16°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	47%	0%	3
Sun 4p	Sunny	61°16° (likely 59°15° to 63°17°)	61°16°	0%	2 mph3 km/h from SW, gusts 6 mph9 km/h	46%	0%	2
Sun 5p	Sunny	60°16° (likely 59°15° to 61°16°)	60°16°	0%	2 mph3 km/h from SW, gusts 6 mph9 km/h	49%	0%	1
Sun 6p	Clear	56°13° (likely 54°12° to 57°14°)	56°13°	0%	2 mph3 km/h from SW, gusts 8 mph13 km/h	59%	0%	0
Sun 7p	Clear	51°11° (likely 49°9° to 55°13°)	51°11°	0%	2 mph3 km/h from SW, gusts 9 mph15 km/h	71%	0%	0
Sun 8p	Clear	46°8° (likely 46°8° to 54°12°)	46°8°	0%	2 mph3 km/h from SW, gusts 10 mph16 km/h	89%	0%	0
Sun 9p	Clear	44°7° (likely 44°7° to 53°12°)	44°7°	0%	2 mph3 km/h from SW, gusts 10 mph17 km/h	96%	0%	0
Sun 10p	Clear	44°7° (likely 44°7° to 53°12°)	44°7°	0%	2 mph3 km/h from SW, gusts 11 mph18 km/h	93%	0%	0
Sun 11p	Clear	43°6° (likely 43°6° to 53°12°)	43°6°	0%	2 mph3 km/h from SW, gusts 11 mph18 km/h	96%	0%	0
Mon 12a	Clear	42°6° (likely 42°6° to 53°12°)	42°6°	0%	2 mph3 km/h from SW, gusts 12 mph19 km/h	100%	1%	0
Mon 1a	Clear	42°6° (likely 42°6° to 52°11°)	40°4°	0%	3 mph5 km/h from W, gusts 13 mph21 km/h	96%	0%	0
Mon 2a	Clear	41°5° (likely 41°5° to 52°11°)	39°4°	0%	3 mph5 km/h from W, gusts 13 mph21 km/h	100%	1%	0
Mon 3a	Clear	40°4° (likely 40°4° to 48°9°)	38°3°	0%	3 mph5 km/h from W, gusts 13 mph20 km/h	100%	1%	0
Mon 4a	Clear	39°4° (likely 39°4° to 48°9°)	36°2°	0%	5 mph8 km/h from W, gusts 14 mph23 km/h	100%	0%	0
Mon 5a	Clear	39°4° (likely 39°4° to 48°9°)	36°2°	0%	5 mph8 km/h from W, gusts 14 mph22 km/h	100%	0%	0
Mon 6a	Clear	37°3° (likely 37°3° to 48°9°)	33°1°	0%	5 mph8 km/h from W, gusts 14 mph22 km/h	100%	0%	0
Mon 7a	Sunny	38°3° (likely 38°3° to 48°9°)	34°1°	0%	6 mph10 km/h from W, gusts 14 mph22 km/h	100%	1%	0
Mon 8a	Sunny	41°5° (likely 41°5° to 49°9°)	37°3°	0%	6 mph10 km/h from W, gusts 13 mph21 km/h	100%	21%	0
Mon 9a	Sunny	45°7° (likely 45°7° to 52°11°)	41°5°	0%	7 mph11 km/h from W, gusts 14 mph22 km/h	93%	31%	1
Mon 10a	Sunny	50°10° (likely 50°10° to 56°13°)	47°8°	0%	7 mph11 km/h from W, gusts 14 mph22 km/h	80%	11%	2
Mon 11a	Sunny	54°12° (likely 54°12° to 60°16°)	54°12°	0%	8 mph13 km/h from W, gusts 12 mph19 km/h	74%	8%	3
Mon 12p	Sunny	58°14° (likely 57°14° to 62°17°)	58°14°	0%	9 mph14 km/h from W, gusts 12 mph19 km/h	67%	1%	4
Mon 1p	Sunny	60°16° (likely 59°15° to 64°18°)	60°16°	0%	9 mph14 km/h from W, gusts 12 mph19 km/h	62%	1%	4
Mon 2p	Sunny	62°17° (likely 61°16° to 65°18°)	62°17°	0%	9 mph14 km/h from W, gusts 12 mph20 km/h	58%	0%	4
Mon 3p	Sunny	63°17° (likely 61°16° to 65°18°)	63°17°	0%	9 mph14 km/h from W, gusts 12 mph19 km/h	58%	2%	3

Days ahead

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

Today, Oct 24. Cloudy. High 59°15°, low 34°1°. Typical 61°16° / 40°4°. Dry. Forecasts agree.
1. Afternoon
  noon–6 PM
  Sunny, 59°15°
  Dry
2. Evening
  6 PM–midnight
  Mostly clear, 49°9°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Official NWS forecast
Today: Mostly sunny, with a high near 59. West wind around 5 mph.
Tonight: Areas of frost after 3am. Mostly clear, with a low around 34. Northwest wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
57°14°–59°15°
Low, likely
34°1°–45°7°
Typical high / low
61°16° / 40°4°
Wind
8 mph13 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 61°16°, low 36°2°. Typical 60°16° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 39°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 46°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 39°4°
  Dry
Official NWS forecast
Day: Areas of frost before 8am. Sunny, with a high near 61. Northwest wind around 3 mph.
Night: Clear. Low around 36, with temperatures rising to around 39 overnight. Southwest wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–64°18°
Low, likely
36°2°–47°8°
Typical high / low
60°16° / 39°4°
Wind
9 mph14 km/h, gusts 17 mph27 km/h
UV peak
4
Monday, Oct 26. Sunny. High 64°18°, low 46°8°. Typical 60°16° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Official NWS forecast
Day: Patchy frost before 8am. Sunny, with a high near 64. West wind 5 to 9 mph.
Night: Clear. Low around 46, with temperatures rising to around 49 overnight.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–64°18°
Low, likely
40°4°–50°10°
Typical high / low
60°16° / 39°4°
Wind
12 mph19 km/h, gusts 22 mph35 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 56°13°, low 40°4°. Typical 60°16° / 39°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 54°12°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°10°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 56.
Night: Mostly clear, with a low around 40.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
56°13°–59°15°
Low, likely
40°4°–51°11°
Typical high / low
60°16° / 39°4°
Wind
16 mph26 km/h, gusts 26 mph41 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 55°13°, low 44°7°. Typical 59°15° / 38°3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 55.
Night: Partly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
53°12°–58°14°
Low, likely
40°4°–49°9°
Typical high / low
59°15° / 38°3°
Wind
12 mph19 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 63°17°, low 51°11°. Typical 59°15° / 38°3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  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 63.
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°–53°12°
Typical high / low
59°15° / 38°3°
Wind
13 mph21 km/h, gusts 26 mph42 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 66°19°, low 49°9°. Typical 59°15° / 38°3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  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: Sunny, with a high near 66.
Night: Mostly clear, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–68°20°
Low, likely
49°9°–56°13°
Typical high / low
59°15° / 38°3°
Wind
11 mph18 km/h, gusts 28 mph45 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 62°17°, low 54°12°. Typical 58°14° / 38°3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  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
61°16°–66°19°
Low, likely
53°12°–55°13°
Typical high / low
58°14° / 38°3°
Wind
13 mph20 km/h, gusts 27 mph44 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 63°17°, low 55°13°. Typical 58°14° / 37°3°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 60°16°
  30% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  30% chance · 0.04 in1 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
58°14°–68°20°
Low, likely
52°11°–58°14°
Typical high / low
58°14° / 37°3°
Wind
12 mph19 km/h, gusts 26 mph41 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 65°18°, low 60°16°. Typical 58°14° / 37°3°. Rain 0.39 in9.9 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Showers, 62°17°
  30% chance · 0.1 in2.5 mm
2. Afternoon
  noon–6 PM
  Showers, 66°19°
  20% chance · 0.13 in3.2 mm
3. Evening
  6 PM–midnight
  Drizzle, 64°18°
  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
57°14°–65°18°
Typical high / low
58°14° / 37°3°
Wind
23 mph36 km/h, gusts 37 mph59 km/h

10 days15 days30 days

The outlook

Today
Dry, high 59°, low 34°.
Tomorrow
Dry, high 61°, low 36°.
Monday
Dry, high 64°, low 46°, warming up.
Rest of week
Mostly dry, highs 55–66°.

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

Peconic River at Riverhead (IN MLLW)

3.0 mi

Below flood stage

Level: 2.5 ft

Reading from Sat 2:54 PM · NWS gauge page

Shinnecock Bay at Ponquogue (IN MLLW)

11 mi

Below flood stage

Level: 1.5 ft

Reading from Sat 2:48 PM · NWS gauge page

Moriches Bay at Moriches Bay (IN MLLW)

12 mi

Below flood stage

Level: 1.5 ft

Reading from Sat 2:48 PM · NWS gauge page

Shelter Island Sound at Shelter Island (IN MLLW)

20 mi

Level: 1.2 ft

Reading from Sat 3 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 35Typical 111

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 19 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 37°F).

Open the windows?

Sun, 3:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Westhampton Gabreski Airport · official normals 1991–2020 · records 1951–2026

Oct 24, today vs a typical year

Today’s expected high is 2°1° colder than typical.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 45 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 31 min less
Golden hour: 5:18–6:14 PM; Morning 6:54–7:50 AM
Blue hour: 6:14–6:24 PM; Morning 6:44–6:54 AM; first light 6:44 AM

Stars tonight? Fair

Clear 8 PM–6:45 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:22 AM · rises 4:53 PM
Full moon: Oct 26
New moon: Nov 9

Looking north from Riverhead. The highest point on the skyline is about 4,000 ft, 65 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

Riverhead, NY weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Peconic River at Riverhead (IN MLLW)

Shinnecock Bay at Ponquogue (IN MLLW)

Moriches Bay at Moriches Bay (IN MLLW)

Shelter Island Sound at Shelter Island (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