Frost Advisory
Starts in 7 h 43 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 KGON

Old Saybrook Center, CT weather

Sunny and 59°15°, jacket by 6 PM.

Mostly agree

Now 59°15°

Sunny

Wind: 9 mph15 km/h; From the southwest. Up to 9 mph15 km/h through 4 AM
Dew point: 39°4°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air today: 39Good; EPA forecast · PM2.5 (fine particles)
Pressure: 30.49 inHg1033 hPa; Falling slowly · −0.04 inHg−1.3 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 (61°16° then, 60°16° now)

Good hours for

Below 50°10° tonight after 8 PM
Low 36°2° tonight at 5 AM
Above 50°10° tomorrow by 10 AM
High 62°17° tomorrow at 2 PM

This afternoonNear 58°14° · Clear
TonightDown to 36°2° by 5 AM · Clear
Tomorrow morningUp to 55°13° by 11 AM · Clear
Tomorrow afternoonUp to 63°17° by 4 PM · Clear
Tomorrow nightDown to 44°7° by 4 AM · Clear
Monday morningUp to 59°15° by 11 AM · Clear
Monday afternoonUp to 66°19° 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	59°15° (likely 58°14° to 61°16°)	59°15°	0%	5 mph8 km/h from W, gusts 10 mph15 km/h	45%	35%	1
Sat 5p	Mostly sunny	57°14° (likely 56°13° to 58°14°)	57°14°	0%	3 mph5 km/h from W, gusts 9 mph15 km/h	51%	11%	0
Sat 6p	Clear	54°12° (likely 52°11° to 54°12°)	54°12°	0%	2 mph3 km/h from W, gusts 10 mph15 km/h	57%	0%	0
Sat 7p	Clear	52°11° (likely 48°9° to 52°11°)	52°11°	0%	2 mph3 km/h from NW, gusts 9 mph14 km/h	61%	0%	0
Sat 8p	Clear	46°8° (likely 46°8° to 48°9°)	46°8°	0%	1 mph2 km/h from NW, gusts 8 mph13 km/h	73%	1%	0
Sat 9p	Clear	45°7° (likely 44°7° to 47°8°)	45°7°	0%	0 mph0 km/h, gusts 9 mph14 km/h	76%	0%	0
Sat 10p	Clear	43°6° (likely 43°6° to 45°7°)	43°6°	0%	0 mph0 km/h, gusts 8 mph13 km/h	79%	0%	0
Sat 11p	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 8 mph13 km/h	86%	0%	0
Sun 12a	Clear	40°4° (likely 39°4° to 42°6°)	40°4°	0%	0 mph0 km/h, gusts 7 mph12 km/h	85%	0%	0
Sun 1a	Clear	39°4° (likely 39°4° to 40°4°)	39°4°	0%	1 mph2 km/h from N, gusts 7 mph12 km/h	85%	0%	0
Sun 2a	Clear	38°3° (likely 37°3° to 40°4°)	38°3°	0%	1 mph2 km/h from N, gusts 9 mph15 km/h	89%	0%	0
Sun 3a	Clear	38°3° (likely 37°3° to 40°4°)	38°3°	0%	1 mph2 km/h from N, gusts 8 mph12 km/h	85%	0%	0
Sun 4a	Clear	37°3° (likely 36°2° to 39°4°)	37°3°	0%	1 mph2 km/h from N, gusts 8 mph12 km/h	89%	0%	0
Sun 5a	Clear	36°2° (likely 35°2° to 38°3°)	36°2°	0%	1 mph2 km/h from N, gusts 8 mph13 km/h	92%	0%	0
Sun 6a	Clear	36°2° (likely 33°1° to 37°3°)	36°2°	0%	1 mph2 km/h from N, gusts 8 mph13 km/h	92%	6%	0
Sun 7a	Sunny	36°2° (likely 33°1° to 37°3°)	36°2°	0%	2 mph3 km/h from N, gusts 8 mph13 km/h	92%	4%	0
Sun 8a	Sunny	37°3° (likely 34°1° to 39°4°)	37°3°	0%	2 mph3 km/h from N, gusts 8 mph12 km/h	92%	0%	0
Sun 9a	Sunny	44°7° (likely 42°6° to 45°7°)	44°7°	0%	2 mph3 km/h from N, gusts 8 mph13 km/h	70%	0%	1
Sun 10a	Sunny	50°10° (likely 50°10° to 53°12°)	50°10°	0%	1 mph2 km/h from N, gusts 7 mph10 km/h	58%	0%	2
Sun 11a	Sunny	55°13° (likely 55°13° to 59°15°)	55°13°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	51%	0%	3
Sun 12p	Sunny	58°14° (likely 58°14° to 63°17°)	58°14°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	45%	0%	4
Sun 1p	Sunny	61°16° (likely 61°16° to 65°18°)	61°16°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	44%	0%	4
Sun 2p	Sunny	62°17° (likely 62°17° to 65°18°)	62°17°	0%	5 mph8 km/h from SW, gusts 8 mph12 km/h	44%	0%	4
Sun 3p	Sunny	62°17° (likely 62°17° to 65°18°)	62°17°	0%	5 mph8 km/h from SW, gusts 9 mph15 km/h	46%	0%	3
Sun 4p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	5 mph8 km/h from SW, gusts 10 mph16 km/h	46%	0%	2
Sun 5p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	3 mph5 km/h from SW, gusts 9 mph15 km/h	51%	0%	1
Sun 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	3 mph5 km/h from SW, gusts 9 mph14 km/h	57%	0%	0
Sun 7p	Clear	55°13° (likely 50°10° to 55°13°)	55°13°	0%	2 mph3 km/h from SW, gusts 8 mph12 km/h	66%	0%	0
Sun 8p	Clear	50°10° (likely 48°9° to 52°11°)	50°10°	0%	2 mph3 km/h from SW, gusts 6 mph10 km/h	83%	0%	0
Sun 9p	Clear	50°10° (likely 47°8° to 51°11°)	50°10°	0%	2 mph3 km/h from SW, gusts 9 mph14 km/h	83%	0%	0
Sun 10p	Clear	49°9° (likely 46°8° to 50°10°)	49°9°	0%	2 mph3 km/h from SW, gusts 9 mph15 km/h	86%	0%	0
Sun 11p	Clear	49°9° (likely 46°8° to 50°10°)	49°9°	0%	2 mph3 km/h from SW, gusts 10 mph15 km/h	86%	0%	0
Mon 12a	Clear	48°9° (likely 46°8° to 48°9°)	48°9°	0%	2 mph3 km/h from W, gusts 11 mph17 km/h	89%	0%	0
Mon 1a	Clear	47°8° (likely 44°7° to 48°9°)	47°8°	0%	2 mph3 km/h from W, gusts 12 mph19 km/h	89%	0%	0
Mon 2a	Clear	47°8° (likely 43°6° to 47°8°)	47°8°	0%	2 mph3 km/h from W, gusts 12 mph20 km/h	89%	1%	0
Mon 3a	Clear	45°7° (likely 42°6° to 46°8°)	45°7°	0%	2 mph3 km/h from W, gusts 12 mph19 km/h	93%	0%	0
Mon 4a	Clear	44°7° (likely 40°4° to 45°7°)	42°6°	0%	3 mph5 km/h from W, gusts 11 mph17 km/h	96%	0%	0
Mon 5a	Clear	44°7° (likely 39°4° to 44°7°)	42°6°	0%	3 mph5 km/h from W, gusts 11 mph18 km/h	93%	0%	0
Mon 6a	Clear	43°6° (likely 39°4° to 44°7°)	41°5°	0%	3 mph5 km/h from W, gusts 11 mph17 km/h	93%	2%	0
Mon 7a	Sunny	44°7° (likely 39°4° to 44°7°)	42°6°	0%	3 mph5 km/h from W, gusts 11 mph17 km/h	86%	2%	0
Mon 8a	Sunny	44°7° (likely 40°4° to 45°7°)	42°6°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	86%	16%	0
Mon 9a	Partly sunny	48°9° (likely 46°8° to 51°11°)	47°8°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	77%	41%	1
Mon 10a	Sunny	54°12° (likely 52°11° to 56°13°)	54°12°	0%	5 mph8 km/h from W, gusts 8 mph14 km/h	69%	11%	2
Mon 11a	Sunny	59°15° (likely 57°14° to 60°16°)	59°15°	0%	6 mph10 km/h from W, gusts 10 mph15 km/h	62%	9%	3
Mon 12p	Sunny	62°17° (likely 61°16° to 63°17°)	62°17°	0%	7 mph11 km/h from W, gusts 12 mph19 km/h	60%	3%	4
Mon 1p	Sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	8 mph13 km/h from W, gusts 13 mph21 km/h	58%	6%	4
Mon 2p	Sunny	65°18° (likely 64°18° to 66°19°)	65°18°	0%	9 mph14 km/h from W, gusts 13 mph21 km/h	58%	12%	4
Mon 3p	Sunny	66°19° (likely 65°18° to 66°19°)	66°19°	0%	9 mph14 km/h from W, gusts 13 mph21 km/h	58%	1%	3

Days ahead

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

Today, Oct 24. Mostly sunny. High 59°15°, low 35°2°. Typical 62°17° / 47°8°. Dry. Mostly agree.
1. Afternoon
  noon–6 PM
  Mostly sunny, 59°15°
  Dry
2. Evening
  6 PM–midnight
  Clear, 46°8°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Official NWS forecast
Today: Sunny. High near 59, with temperatures falling to around 57 in the afternoon. West wind around 5 mph.
Tonight: Areas of frost after 2am. Mostly clear, with a low around 35. Northwest wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–61°16°
Low, likely
31°−1°–35°2°
Typical high / low
62°17° / 47°8°
Wind
9 mph14 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 63°17°, low 43°6°. Typical 61°16° / 47°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Sunny. High near 63, with temperatures falling to around 61 in the afternoon. Northwest wind 1 to 5 mph.
Night: Clear, with a low around 43. West wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
33°1°–43°6°
Typical high / low
61°16° / 47°8°
Wind
8 mph13 km/h, gusts 14 mph22 km/h
UV peak
4
Monday, Oct 26. Sunny. High 66°19°, low 45°7°. Typical 61°16° / 47°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Partly sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Official NWS forecast
Day: Sunny. High near 66, with temperatures falling to around 64 in the afternoon. West wind 3 to 9 mph.
Night: Clear. Low around 45, with temperatures rising to around 47 overnight.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–66°19°
Low, likely
39°4°–45°7°
Typical high / low
61°16° / 47°8°
Wind
10 mph16 km/h, gusts 19 mph30 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 60°16°, low 35°2°. Typical 60°16° / 46°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  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 35.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
55°13°–60°16°
Low, likely
35°2°–44°7°
Typical high / low
60°16° / 46°8°
Wind
12 mph19 km/h, gusts 23 mph37 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 57°14°, low 43°6°. Typical 60°16° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 46°8°
  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 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
52°11°–57°14°
Low, likely
32°0°–43°6°
Typical high / low
60°16° / 46°8°
Wind
8 mph13 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 64°18°, low 50°10°. Typical 60°16° / 46°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  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 64.
Night: Mostly clear, with a low around 50.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
58°14°–64°18°
Low, likely
43°6°–50°10°
Typical high / low
60°16° / 46°8°
Wind
11 mph18 km/h, gusts 33 mph53 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 68°20°, low 48°9°. Typical 59°15° / 46°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  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 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–70°21°
Low, likely
48°9°–52°11°
Typical high / low
59°15° / 46°8°
Wind
10 mph16 km/h, gusts 24 mph39 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 64°18°, low 48°9°. Typical 59°15° / 45°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 51°11°
  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
60°16°–68°20°
Low, likely
46°8°–50°10°
Typical high / low
59°15° / 45°7°
Wind
12 mph20 km/h, gusts 26 mph42 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 64°18°, low 51°11°. Typical 58°14° / 45°7°. Rain 0.01 in0.3 mm, 30% chance. 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°
  30% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Drizzle, 59°15°
  40% chance · 0.04 in0.9 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°–70°21°
Low, likely
48°9°–54°12°
Typical high / low
58°14° / 45°7°
Wind
10 mph16 km/h, gusts 24 mph39 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 65°18°, low 59°15°. Typical 58°14° / 45°7°. Rain 0.42 in11 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 61°16°
  40% chance · 0.1 in2.6 mm
2. Afternoon
  noon–6 PM
  Showers, 64°18°
  30% chance · 0.18 in4.5 mm
3. Evening
  6 PM–midnight
  Showers, 63°17°
  20% chance · 0.18 in4.5 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°–69°21°
Low, likely
56°13°–65°18°
Typical high / low
58°14° / 45°7°
Wind
18 mph29 km/h, gusts 32 mph51 km/h

10 days15 days30 days

The outlook

Today
Dry, high 59°, low 35°.
Tomorrow
Dry, high 63°, low 43°, warming up.
Monday
Dry, high 66°, low 45°, 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

Long Island Sound near New London Harbor (IN MLLW)

15 mi

Below flood stage

Level: 1.0 ft

Forecast peak 4.3 ft Tue 10 AM

Reading from Sat 3 PM · NWS gauge page

Connecticut River at Middle Haddam

20 mi

Below flood stage

Level: 2.6 ft

Forecast peak 3.3 ft Sun 1 PM

Reading from Sat 2:45 PM · NWS gauge page

Yantic River at Yantic

22 mi

Below flood stage

Level: 2.0 ft
Flow: 88 cfs

Forecast peak 2.0 ft Sat 8 PM

Reading from Sat 2:45 PM · NWS gauge page

Orient Harbor at Orient (IN MLLW)

11 mi

Below flood stage

Level: 1.1 ft

Reading from Sat 2:54 PM · NWS gauge page

For your home

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

Heating this week

About 62% less heating than a typical week.

This week 30Typical 81

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 22
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 10 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 39°F).

Open the windows?

Sun, 1:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Orient Point State Park · official normals 1991–2020 · records 2017–2026

Oct 24, today vs a typical year

Today’s expected high is 3°2° colder than typical.

Last 7 days vs normal

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

−10°−6°SunOct 18
−7°−4°MonOct 19
±0°TueOct 20
+3°+1°WedOct 21
±0°ThuOct 22
+2°+1°FriOct 23
−4°−2°SatOct 24

Old Saybrook Center 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: 5:16–6:12 PM; Morning 6:54–7:49 AM
Blue hour: 6:12–6:23 PM; Morning 6:43–6:54 AM; first light 6:43 AM

Stars tonight? Fair

Clear 6:23 PM–6:44 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:21 AM · rises 4:51 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Old Saybrook Center. The highest point on the skyline is about 600 ft, 12 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

Old Saybrook Center, 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 New London Harbor (IN MLLW)

Connecticut River at Middle Haddam

Yantic River at Yantic

Orient Harbor at Orient (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