Observed 11:50 AM EDT at KISP

Lake Ronkonkoma, NY weather

Sunny and 57°14°, jacket by 7 PM.

Mostly agree

Now 57°14°

Sunny

Wind: 5 mph7 km/h; From the northwest. Up to 5 mph8 km/h through 12 AM
Dew point: 40°4°; Comfortable
UV index: 3Moderate; Moderate until 4 PM · peak 4
Air today: 50Good; EPA forecast · PM2.5 (fine particles)
Pressure: 30.56 inHg1035 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (55°13° then, 55°13° now)

Good hours for

High 60°16° today at 2 PM
Below 50°10° tonight after 9 PM
Low 40°4° tonight at 5 AM
Above 50°10° tomorrow by 10 AM

This afternoonNear 60°16° · Mostly cloudy
TonightDown to 40°4° by 5 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonNear 61°16° · Clear
Tomorrow nightDown to 45°7° by 3 AM · Clear
Monday morningUp to 58°14° by 11 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
Sat 12p	Mostly cloudy	59°15° (likely 54°12° to 59°15°)	59°15°	0%	3 mph5 km/h from N, gusts 7 mph10 km/h	49%	50%	3
Sat 1p	Cloudy	59°15° (likely 56°13° to 59°15°)	59°15°	0%	5 mph8 km/h from NW, gusts 6 mph10 km/h	47%	77%	4
Sat 2p	Cloudy	60°16° (likely 57°14° to 60°16°)	60°16°	0%	5 mph8 km/h from NW, gusts 6 mph10 km/h	42%	80%	3
Sat 3p	Cloudy	60°16° (likely 57°14° to 61°16°)	60°16°	0%	5 mph8 km/h from NW, gusts 7 mph11 km/h	42%	74%	3
Sat 4p	Cloudy	60°16° (likely 57°14° to 60°16°)	60°16°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	42%	75%	2
Sat 5p	Partly sunny	60°16° (likely 57°14° to 60°16°)	60°16°	0%	3 mph5 km/h from W, gusts 8 mph12 km/h	44%	75%	1
Sat 6p	Partly cloudy	56°13° (likely 53°12° to 56°13°)	56°13°	0%	2 mph3 km/h from SW, gusts 7 mph12 km/h	53%	70%	0
Sat 7p	Mostly clear	53°12° (likely 50°10° to 54°12°)	53°12°	0%	2 mph3 km/h from SW, gusts 6 mph10 km/h	57%	32%	0
Sat 8p	Clear	50°10° (likely 49°9° to 53°12°)	50°10°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	63%	10%	0
Sat 9p	Mostly clear	47°8° (likely 47°8° to 52°11°)	47°8°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	74%	11%	0
Sat 10p	Clear	46°8° (likely 46°8° to 51°11°)	46°8°	0%	1 mph2 km/h from W, gusts 5 mph7 km/h	76%	11%	0
Sat 11p	Clear	45°7° (likely 45°7° to 50°10°)	45°7°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	79%	2%	0
Sun 12a	Clear	44°7° (likely 44°7° to 49°9°)	44°7°	0%	1 mph2 km/h from NW, gusts 4 mph6 km/h	82%	0%	0
Sun 1a	Clear	43°6° (likely 43°6° to 49°9°)	43°6°	0%	1 mph2 km/h from NW, gusts 4 mph6 km/h	86%	0%	0
Sun 2a	Clear	43°6° (likely 42°6° to 48°9°)	43°6°	0%	2 mph3 km/h from NW, gusts 4 mph7 km/h	89%	0%	0
Sun 3a	Clear	42°6° (likely 41°5° to 48°9°)	42°6°	0%	2 mph3 km/h from NW, gusts 4 mph7 km/h	93%	0%	0
Sun 4a	Clear	41°5° (likely 41°5° to 48°9°)	41°5°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	96%	1%	0
Sun 5a	Clear	40°4° (likely 40°4° to 47°8°)	40°4°	0%	2 mph3 km/h from NW, gusts 8 mph14 km/h	100%	0%	0
Sun 6a	Clear	40°4° (likely 40°4° to 47°8°)	40°4°	0%	2 mph3 km/h from NW, gusts 7 mph12 km/h	85%	0%	0
Sun 7a	Sunny	40°4° (likely 40°4° to 47°8°)	40°4°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	89%	0%	0
Sun 8a	Sunny	42°6° (likely 40°4° to 47°8°)	42°6°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	89%	1%	0
Sun 9a	Sunny	47°8° (likely 46°8° to 50°10°)	47°8°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	79%	1%	1
Sun 10a	Sunny	53°12° (likely 53°12° to 55°13°)	53°12°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	66%	0%	2
Sun 11a	Sunny	57°14° (likely 56°13° to 59°15°)	57°14°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	55%	0%	3
Sun 12p	Sunny	60°16° (likely 59°15° to 61°16°)	60°16°	0%	3 mph5 km/h from NW, gusts 7 mph12 km/h	49%	0%	4
Sun 1p	Sunny	62°17° (likely 60°16° to 63°17°)	62°17°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	44%	0%	4
Sun 2p	Sunny	62°17° (likely 61°16° to 65°18°)	62°17°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	43%	0%	4
Sun 3p	Sunny	63°17° (likely 62°17° to 65°18°)	63°17°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	41%	0%	3
Sun 4p	Sunny	62°17° (likely 61°16° to 65°18°)	62°17°	0%	3 mph5 km/h from W, gusts 6 mph9 km/h	43%	0%	2
Sun 5p	Sunny	61°16° (likely 59°15° to 63°17°)	61°16°	0%	3 mph5 km/h from SW, gusts 5 mph8 km/h	46%	0%	1
Sun 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	3 mph5 km/h from SW, gusts 7 mph11 km/h	53%	0%	0
Sun 7p	Clear	53°12° (likely 51°11° to 55°13°)	53°12°	0%	2 mph3 km/h from SW, gusts 7 mph12 km/h	64%	0%	0
Sun 8p	Clear	51°11° (likely 49°9° to 53°12°)	51°11°	0%	2 mph3 km/h from SW, gusts 9 mph14 km/h	74%	0%	0
Sun 9p	Clear	50°10° (likely 49°9° to 53°12°)	50°10°	0%	2 mph3 km/h from SW, gusts 10 mph16 km/h	77%	0%	0
Sun 10p	Clear	49°9° (likely 48°9° to 53°12°)	49°9°	0%	2 mph3 km/h from SW, gusts 9 mph15 km/h	80%	1%	0
Sun 11p	Clear	48°9° (likely 47°8° to 52°11°)	48°9°	0%	2 mph3 km/h from SW, gusts 9 mph15 km/h	83%	1%	0
Mon 12a	Clear	47°8° (likely 46°8° to 52°11°)	47°8°	0%	2 mph3 km/h from W, gusts 10 mph16 km/h	86%	0%	0
Mon 1a	Clear	47°8° (likely 45°7° to 51°11°)	47°8°	0%	3 mph5 km/h from W, gusts 11 mph18 km/h	83%	0%	0
Mon 2a	Clear	46°8° (likely 45°7° to 51°11°)	46°8°	0%	3 mph5 km/h from W, gusts 11 mph17 km/h	86%	0%	0
Mon 3a	Clear	45°7° (likely 44°7° to 50°10°)	45°7°	0%	3 mph5 km/h from W, gusts 10 mph16 km/h	86%	0%	0
Mon 4a	Clear	45°7° (likely 42°6° to 49°9°)	43°6°	0%	5 mph8 km/h from W, gusts 13 mph21 km/h	82%	0%	0
Mon 5a	Clear	45°7° (likely 42°6° to 49°9°)	43°6°	0%	5 mph8 km/h from W, gusts 11 mph17 km/h	82%	2%	0
Mon 6a	Clear	44°7° (likely 41°5° to 48°9°)	41°5°	0%	5 mph8 km/h from W, gusts 13 mph20 km/h	82%	1%	0
Mon 7a	Sunny	43°6° (likely 41°5° to 48°9°)	40°4°	0%	5 mph8 km/h from W, gusts 11 mph17 km/h	86%	14%	0
Mon 8a	Sunny	45°7° (likely 42°6° to 49°9°)	43°6°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	82%	11%	0
Mon 9a	Sunny	48°9° (likely 47°8° to 54°12°)	46°8°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	77%	14%	1
Mon 10a	Sunny	53°12° (likely 53°12° to 58°14°)	53°12°	0%	6 mph10 km/h from W, gusts 12 mph19 km/h	66%	11%	2
Mon 11a	Sunny	58°14° (likely 56°13° to 61°16°)	58°14°	0%	6 mph10 km/h from W, gusts 12 mph19 km/h	57%	14%	3

Days ahead

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

Today, Oct 24. Cloudy. High 60°16°, low 38°3°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Afternoon
  noon–6 PM
  Cloudy, 60°16°
  Dry
2. Evening
  6 PM–midnight
  Mostly clear, 50°10°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Today: Partly sunny, with a high near 60. Northwest wind around 5 mph.
Tonight: Patchy frost after 5am. Mostly clear. Low around 38, with temperatures rising to around 40 overnight. West wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–61°16°
Low, likely
37°3°–44°7°
Typical high / low
61°16° / 44°7°
Wind
8 mph13 km/h, gusts 13 mph21 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 41°5°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Official NWS forecast
Day: Patchy frost before 8am. Sunny. High near 64, with temperatures falling to around 61 in the afternoon. Northwest wind around 3 mph.
Night: Clear. Low around 41, with temperatures rising to around 45 overnight. Southwest wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
40°4°–47°8°
Typical high / low
61°16° / 44°7°
Wind
7 mph11 km/h, gusts 15 mph24 km/h
UV peak
4
Monday, Oct 26. Sunny. High 66°19°, low 46°8°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Official NWS forecast
Day: Sunny. High near 66, with temperatures falling to around 64 in the afternoon. West wind around 7 mph.
Night: Clear. Low around 46, with temperatures rising to around 48 overnight.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–67°19°
Low, likely
41°5°–48°9°
Typical high / low
61°16° / 44°7°
Wind
9 mph14 km/h, gusts 20 mph32 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 56°13°, low 39°4°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 55°13°
  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.
Official NWS forecast
Day: Sunny, with a high near 56.
Night: Mostly clear, with a low around 39.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
56°13°–59°15°
Low, likely
39°4°–51°11°
Typical high / low
60°16° / 43°6°
Wind
13 mph20 km/h, gusts 26 mph41 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 57°14°, low 47°8°. Typical 60°16° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 51°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 57.
Night: Partly cloudy, with a low around 47.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
54°12°–60°16°
Low, likely
42°6°–47°8°
Typical high / low
60°16° / 43°6°
Wind
11 mph17 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 63°17°, low 51°11°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 51°11°
  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, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 63.
Night: Partly cloudy, with a low around 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–64°18°
Low, likely
48°9°–52°11°
Typical high / low
60°16° / 43°6°
Wind
13 mph21 km/h, gusts 22 mph36 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 65°18°, low 47°8°. Typical 59°15° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 65.
Night: Mostly clear, with a low around 47.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
65°18°–70°21°
Low, likely
47°8°–54°12°
Typical high / low
59°15° / 42°6°
Wind
12 mph19 km/h, gusts 25 mph41 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 64°18°, low 51°11°. Typical 59°15° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 54°12°
  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
57°14°–70°21°
Low, likely
48°9°–56°13°
Typical high / low
59°15° / 42°6°
Wind
12 mph20 km/h, gusts 24 mph38 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 63°17°, low 54°12°. Typical 58°14° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  20% chance
4. Overnight
  midnight–6 AM
  Partly cloudy, 55°13°
  30% chance
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°–67°19°
Low, likely
45°7°–59°15°
Typical high / low
58°14° / 42°6°
Wind
12 mph19 km/h, gusts 23 mph37 km/h
UV peak
4
Monday, Nov 2. Cloudy. High 61°16°, low 56°13°. Typical 58°14° / 42°6°. Rain 0.06 in1.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 58°14°
  30% chance
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  20% chance
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  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
55°13°–67°19°
Low, likely
47°8°–61°16°
Typical high / low
58°14° / 42°6°
Wind
11 mph18 km/h, gusts 19 mph30 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 60°, low 38°.
Tomorrow
Dry, high 64°, low 41°, warming up.
Monday
Dry, high 66°, low 46°.
Rest of week
Mostly dry, highs 56–65°.

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

Great South Bay at Lindenhurst (IN MLLW)

17 mi

Action stage

Level: 2.8 ft

Reading from Sat 10 AM · NWS gauge page

Long Island Sound near Bridgeport Harbor (IN MLLW)

24 mi

Below flood stage

Level: 8.7 ft

Forecast peak 9.1 ft Tue 12 PM

Reading from Sat 10:30 AM · NWS gauge page

Flax Pond at Old Field (IN MLLW)

9.3 mi

Below flood stage

Level: 8.7 ft

Reading from Sat 10:24 AM · NWS gauge page

Great South Bay at Watch Hill (IN MLLW)

12 mi

Below flood stage

Level: 2.6 ft

Reading from Sat 10 AM · NWS gauge page

For your home

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

Heating this week

About 69% less heating than a typical week.

This week 28Typical 93

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

Comfort

Dry air outside (dew point 39°F).

Open the windows?

Today, 2:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Islip-Li Macarthur Airport · official normals 1991–2020 · records 1963–2026

Oct 24, today vs a typical year

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

Last 7 days vs normal

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

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

Lake Ronkonkoma 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: 5:20–6:16 PM; Morning 6:56–7:51 AM
Blue hour: 6:16–6:26 PM; Morning 6:45–6:56 AM; first light 6:45 AM

Stars tonight? Fair

Mostly 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 4:55 PM
Full moon: Oct 26
New moon: Nov 9

Looking south from Lake Ronkonkoma. The highest point on the skyline is about 1,000 ft, 17 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Lake Ronkonkoma, NY weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Great South Bay at Lindenhurst (IN MLLW)

Long Island Sound near Bridgeport Harbor (IN MLLW)

Flax Pond at Old Field (IN MLLW)

Great South Bay at Watch Hill (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