Nassau County, New York, United States

Last updated: 7:54 PM CDT · Refresh

23°C

Feels like 24°

Haze

▲ 26° / ▼ 22°

Wind

11 mph SSW

Humidity

91%

Dew Point

22°

Pressure

29.62 inHg

Visibility

2 mi

UV Index

0.0

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 haze at 23°C. Precipitation is likely — peak probability 83% around 8 PM. Atmospheric instability is elevated (CAPE up to 1359 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

23°

83%

9 PM

23°

83%

10 PM

23°

57%

11 PM

23°

41%

12 AM

23°

48%

1 AM

24°

47%

2 AM

24°

54%

3 AM

24°

40%

4 AM

23°

44%

5 AM

22°

45%

6 AM

23°

45%

7 AM

23°

23%

8 AM

24°

27%

9 AM

24°

32%

10 AM

26°

40%

11 AM

26°

40%

12 PM

27°

31%

1 PM

26°

28%

2 PM

26°

29%

3 PM

26°

29%

4 PM

26°

30%

5 PM

26°

19%

6 PM

26°

19%

7 PM

26°

7-Day Forecast

Tonight

26° 22°

Haze with a 83% chance of rain.

Wed

27° 21°

Partly Cloudy with a 54% chance of rain.

Thu

26° 19°

Mostly Clear.

Fri

24° 19°

Partly Cloudy.

Sat

24° 19°

Mostly Clear.

Sun

26° 19°

Drizzle, 70% chance.

Mon

26° 21°

Drizzle, 52% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 23° Haze 83% 11 mph SSW 91%

9 PM 23° Rain 83% 11 mph SSW 90%

10 PM 23° Overcast 57% 10 mph SSW 90%

11 PM 23° Overcast 41% 10 mph SSW 90%

12 AM 23° Rain 48% 11 mph SSW 91%

1 AM 24° Rain 47% 12 mph SSW 93%

2 AM 24° Rain 54% 13 mph SSW 92%

3 AM 24° Overcast 40% 13 mph SW 92%

4 AM 23° Overcast 44% 12 mph SSW 91%

5 AM 22° Mostly Cloudy 45% 12 mph SW 89%

6 AM 23° Mostly Cloudy 45% 12 mph SW 87%

7 AM 23° Mostly Cloudy 23% 11 mph SW 84%

8 AM 24° Mostly Cloudy 27% 11 mph SW 80%

9 AM 24° Partly Cloudy 32% 11 mph SW 74%

10 AM 26° Rain 40% 11 mph SW 70%

11 AM 26° Partly Cloudy 40% 11 mph WSW 66%

12 PM 27° Partly Cloudy 31% 11 mph WSW 62%

1 PM 26° Partly Cloudy 28% 11 mph WSW 58%

2 PM 26° Partly Cloudy 29% 10 mph WSW 58%

3 PM 26° Partly Cloudy 29% 10 mph WSW 57%

4 PM 26° Partly Cloudy 30% 10 mph WSW 57%

5 PM 26° Partly Cloudy 19% 9 mph WSW 57%

6 PM 26° Mostly Cloudy 19% 9 mph WSW 58%

7 PM 26° Mostly Cloudy 9% 9 mph WSW 58%

15-Day Forecast

Today

7/21

Haze

83%

22°

26°

Wed

7/22

Partly Cloudy

54%

21°

27°

Thu

7/23

Mostly Clear

11%

19°

26°

Fri

7/24

Partly Cloudy

16%

19°

24°

Sat

7/25

Mostly Clear

19°

24°

Sun

7/26

Drizzle

70%

19°

26°

Mon

7/27

Drizzle

52%

21°

26°

Tue

7/28

Rain

63%

21°

26°

Wed

7/29

Drizzle

69%

21°

27°

Thu

7/30

Drizzle

51%

19°

27°

Fri

7/31

Drizzle

60%

21°

28°

Sat

8/1

Drizzle

60%

21°

28°

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

Today 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, 23:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE521 J/kg

MLCAPE1088 J/kg

MUCAPE1623 J/kg

SBCIN-123 J/kg

MLCIN0 J/kg

Lifted Index-3.0

Kinematics

0–6 km Shear33 kt

0–1 km Shear11 kt

Eff. Shear33 kt

0–1 km SRH5

0–3 km SRH-33

Eff. SRH-33

Storm Motion214° @ 36 kt

0–1 km EHI0.0

Composite Parameters

Sig. Tornado0.0

STP (eff)0.0

Supercell0.0

K-Index34.3

Thermo & Levels

PWAT2.12 in

0–3 km LR4.9 °C/km

700–500 LR5.8 °C/km

Total Totals47.4

LCL983 hPa

LFC734 hPa

EL224 hPa

Freezing Lvl14,144 ft

Nassau County, New York, United States

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