Nassau County, New York, United States

Last updated: 6:28 PM CDT · Refresh

24°C

Feels like 24°

Rain

▲ 26° / ▼ 22°

Wind

12 mph S

Humidity

90%

Dew Point

22°

Pressure

29.63 inHg

Visibility

5 mi

UV Index

0.9

Cloud Cover

95%

Sunrise

5:40 AM

Sunset

8:19 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Nassau County is currently rain at 24°C. Precipitation is likely — peak probability 90% around 7 PM. Atmospheric instability is elevated (CAPE up to 1441 J/kg) — isolated convective development possible. Sunrise: 5:40AM · Sunset: 8:19PM.

74 AQI · Moderate Dominant: PM2.5 Air Quality

Hourly Forecast · Next 24 Hours

Now

24°

90%

8 PM

23°

83%

9 PM

23°

77%

10 PM

23°

82%

11 PM

23°

54%

12 AM

23°

52%

1 AM

24°

41%

2 AM

24°

47%

3 AM

24°

47%

4 AM

24°

52%

5 AM

22°

53%

6 AM

23°

53%

7 AM

23°

47%

8 AM

23°

43%

9 AM

24°

43%

10 AM

24°

56%

11 AM

26°

57%

12 PM

26°

47%

1 PM

26°

38%

2 PM

27°

35%

3 PM

26°

35%

4 PM

26°

36%

5 PM

26°

34%

6 PM

26°

28%

7-Day Forecast

Tonight

26° 22°

Rain, 90% chance.

Wed

28° 21°

Partly Cloudy with a 56% chance of rain.

Thu

25° 19°

Mostly Clear.

Fri

24° 18°

Fog.

Sat

24° 18°

Partly Cloudy.

Sun

25° 20°

Rain, 71% chance.

Mon

26° 21°

Drizzle, 60% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 24° Rain 90% 12 mph S 90%

8 PM 23° Overcast 83% 12 mph SSW 90%

9 PM 23° Rain 77% 10 mph SSW 90%

10 PM 23° Overcast 82% 10 mph SSW 90%

11 PM 23° Overcast 54% 10 mph SSW 90%

12 AM 23° Overcast 52% 10 mph SSW 92%

1 AM 24° Overcast 41% 11 mph SSW 94%

2 AM 24° Overcast 47% 11 mph SSW 94%

3 AM 24° Overcast 47% 12 mph SW 93%

4 AM 24° Overcast 52% 12 mph SW 92%

5 AM 22° Mostly Cloudy 53% 11 mph SW 91%

6 AM 23° Mostly Cloudy 53% 10 mph SW 89%

7 AM 23° Mostly Cloudy 47% 10 mph SW 87%

8 AM 23° Mostly Cloudy 43% 10 mph SW 84%

9 AM 24° Partly Cloudy 43% 10 mph SW 80%

10 AM 24° Partly Cloudy 56% 10 mph SW 75%

11 AM 26° Partly Cloudy 57% 10 mph SW 71%

12 PM 26° Partly Cloudy 47% 10 mph WSW 67%

1 PM 26° Partly Cloudy 38% 10 mph WSW 62%

2 PM 27° Partly Cloudy 35% 10 mph WSW 60%

3 PM 26° Partly Cloudy 35% 10 mph WSW 59%

4 PM 26° Partly Cloudy 36% 10 mph SW 59%

5 PM 26° Partly Cloudy 34% 9 mph SW 59%

6 PM 26° Partly Cloudy 28% 9 mph WSW 60%

15-Day Forecast

Today

7/21

Rain

90%

22°

26°

Wed

7/22

Partly Cloudy

56%

21°

28°

Thu

7/23

Mostly Clear

12%

19°

25°

Fri

7/24

Fog

16%

18°

24°

Sat

7/25

Partly Cloudy

18°

24°

Sun

7/26

Rain

71%

20°

25°

Mon

7/27

Drizzle

60%

21°

26°

Tue

7/28

Drizzle

63%

21°

26°

Wed

7/29

Drizzle

68%

21°

25°

Thu

7/30

Drizzle

68%

21°

25°

Fri

7/31

Drizzle

64%

20°

25°

Sat

8/1

Drizzle

60%

21°

24°

Sun

8/2

Drizzle

60%

21°

24°

Mon

8/3

Drizzle

60%

22°

24°

Tue

8/4

Drizzle

60%

22°

26°

Moderate

U.S. Air Quality Index · Dominant: PM2.5

50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today

PM_2.5

Fine particulate matter

Dominant

74 AQI 21.5 µg/m³

O₃

Ground-level ozone

44 AQI 47 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Wed 74 Moderate 44 74

Thu 49 Good 49 43

Fri 37 Good 37 33

About the Air Quality Index

0–50 Good

51–100 Moderate

101–150 Unhealthy for Sensitive Groups

151–200 Unhealthy

201–300 Very Unhealthy

301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM_2.5 (fine particles) is reported in µg/m³ and ozone (O₃) in ppb. Forecast source: NWS NAQFC.

Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio

RAP

Valid Tue Jul 21, 22:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE707 J/kg

MLCAPE1073 J/kg

MUCAPE1563 J/kg

SBCIN0 J/kg

MLCIN0 J/kg

Lifted Index-3.5

Kinematics

0–6 km Shear34 kt

0–1 km Shear15 kt

Eff. Shear34 kt

0–1 km SRH-44

0–3 km SRH-85

Eff. SRH-85

Storm Motion215° @ 39 kt

0–1 km EHI-0.2

Composite Parameters

Sig. Tornado0.0

STP (eff)0.0

Supercell0.0

K-Index32.0

Thermo & Levels

PWAT2.01 in

0–3 km LR5.1 °C/km

700–500 LR5.7 °C/km

Total Totals44.8

LCL983 hPa

LFC1003 hPa

EL213 hPa

Freezing Lvl13,967 ft

Nassau County, New York, United States

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