Suffolk County, New York, United States

Last updated: 7:51 PM CDT  ·  Refresh
23°C
Feels like 24°
Overcast
▲ 24°  /  ▼ 20°
Wind
12 mph SSW
Humidity
95%
Dew Point
22°
Pressure
29.65 inHg
Visibility
5 mi
UV Index
0.0
Cloud Cover
94%
Sunrise
5:37 AM
Sunset
8:17 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Suffolk County is currently overcast at 23°C. Precipitation is likely — peak probability 76% around 8 PM. Atmospheric instability is elevated (CAPE up to 1468 J/kg) — isolated convective development possible. Sunrise: 5:37AM · Sunset: 8:17PM.

Alerts

No active alerts for this location.
74 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
75%
9 PM
22°
66%
10 PM
22°
68%
11 PM
22°
48%
12 AM
22°
41%
1 AM
22°
54%
2 AM
22°
39%
3 AM
22°
40%
4 AM
22°
40%
5 AM
22°
40%
6 AM
22°
45%
7 AM
22°
45%
8 AM
23°
45%
9 AM
24°
46%
10 AM
26°
46%
11 AM
26°
48%
12 PM
27°
51%
1 PM
27°
37%
2 PM
27°
34%
3 PM
27°
34%
4 PM
27°
35%
5 PM
27°
21%
6 PM
26°
22%
7 PM
26°
22%
7-Day Forecast
Tonight
24° 20°
Overcast with a 75% chance of rain.
Wed
28° 21°
Mostly Cloudy with a 48% chance of rain.
Thu
24° 18°
Partly Cloudy.
Fri
24° 17°
Fog.
Sat
24° 18°
Mostly Cloudy.
Sun
25° 18°
Drizzle, 70% chance.
Mon
26° 20°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Overcast 75% 12 mph SSW 95%
9 PM 22° Overcast 66% 12 mph SSW 94%
10 PM 22° Rain 68% 13 mph SSW 94%
11 PM 22° Overcast 48% 12 mph SSW 93%
12 AM 22° Overcast 41% 13 mph SSW 92%
1 AM 22° Overcast 54% 14 mph SSW 92%
2 AM 22° Overcast 39% 14 mph SSW 92%
3 AM 22° Overcast 40% 14 mph SSW 92%
4 AM 22° Overcast 40% 14 mph SW 91%
5 AM 22° Overcast 40% 14 mph SW 90%
6 AM 22° Mostly Cloudy 45% 14 mph SW 89%
7 AM 22° Mostly Cloudy 45% 13 mph SW 87%
8 AM 23° Mostly Cloudy 45% 13 mph SW 85%
9 AM 24° Mostly Cloudy 46% 12 mph SW 82%
10 AM 26° Rain 46% 12 mph SW 79%
11 AM 26° Partly Cloudy 48% 11 mph SW 77%
12 PM 27° Partly Cloudy 51% 10 mph SW 75%
1 PM 27° Mostly Clear 37% 10 mph SW 72%
2 PM 27° Mostly Clear 34% 10 mph SW 70%
3 PM 27° Mostly Clear 34% 9 mph WSW 68%
4 PM 27° Mostly Clear 35% 9 mph WSW 66%
5 PM 27° Mostly Clear 21% 8 mph WSW 68%
6 PM 26° Partly Cloudy 22% 8 mph WSW 70%
7 PM 26° Partly Cloudy 22% 7 mph SW 73%
15-Day Forecast
Today
7/21
Overcast
75%
20°
24°
Wed
7/22
Mostly Cloudy
48%
21°
28°
Thu
7/23
Partly Cloudy
11%
18°
24°
Fri
7/24
Fog
3%
17°
24°
Sat
7/25
Mostly Cloudy
8%
18°
24°
Sun
7/26
Drizzle
70%
18°
25°
Mon
7/27
Drizzle
52%
20°
26°
Tue
7/28
Rain
63%
20°
26°
Wed
7/29
Rain
69%
20°
26°
Thu
7/30
Drizzle
51%
19°
26°
Fri
7/31
Drizzle
60%
20°
26°
Sat
8/1
Drizzle
60%
21°
25°
Sun
8/2
Drizzle
60%
21°
26°
Mon
8/3
Drizzle
60%
22°
26°
Tue
8/4
Drizzle
60%
22°
27°
74
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
PM2.5
Fine particulate matter
Dominant
74 AQI 21.3 µg/m³
O3
Ground-level ozone
42 AQI 46 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 74 Moderate 42 74
Thu 49 Good 49 46
Fri 43 Good 32 43
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. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
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
10 20 30 40 50 60 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE571 J/kg
MLCAPE1042 J/kg
MUCAPE1728 J/kg
SBCIN-128 J/kg
MLCIN0 J/kg
Lifted Index-3.0
Kinematics
0–6 km Shear28 kt
0–1 km Shear12 kt
Eff. Shear30 kt
0–1 km SRH-6
0–3 km SRH-47
Eff. SRH-47
Storm Motion207° @ 37 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index31.9
Thermo & Levels
PWAT2.08 in
0–3 km LR4.8 °C/km
700–500 LR5.7 °C/km
Total Totals44.8
LCL991 hPa
LFC737 hPa
EL221 hPa
Freezing Lvl13,819 ft