Greenwich, Connecticut

Last updated: 6:49 PM CDT  ·  Refresh
28°C
Feels like 28°
Mostly Clear
▲ 29°  /  ▼ 20°
Wind
10 mph WNW
Humidity
45%
Dew Point
16°
Pressure
29.75 inHg
Visibility
3 mi
UV Index
1.6
Cloud Cover
20%
Sunrise
5:36 AM
Sunset
8:24 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Greenwich is currently mostly clear at 28°C. Dry conditions are expected through the next 24 hours. Sunrise: 5:36AM · Sunset: 8:24PM.

Alerts

No active alerts for this location.
255 AQI · Very Unhealthy Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
28°
11%
8 PM
27°
29%
9 PM
27°
29%
10 PM
26°
21%
11 PM
25°
21%
12 AM
24°
21%
1 AM
24°
15%
2 AM
23°
3%
3 AM
22°
3%
4 AM
22°
3%
5 AM
20°
3%
6 AM
21°
3%
7 AM
22°
3%
8 AM
23°
3%
9 AM
23°
3%
10 AM
24°
3%
11 AM
25°
3%
12 PM
26°
3%
1 PM
26°
3%
2 PM
27°
3%
3 PM
27°
3%
4 PM
27°
3%
5 PM
28°
3%
6 PM
28°
3%
7-Day Forecast
Tonight
29° 20°
Mostly Clear with a 21% chance of rain.
Fri
28° 20°
Partly Cloudy.
Sat
26° 21°
Heavy Rain, 83% chance.
Sun
27° 18°
Clear with a 48% chance of rain.
Mon
26° 17°
Mostly Clear.
Tue
27° 20°
Heavy Rain, 90% chance.
Wed
26° 18°
Rain, 90% chance.
TimeTempConditionsPrecipWindHumidity
Now 28° Mostly Clear 11% 10 mph WNW 45%
8 PM 27° Mostly Clear 29% 8 mph WNW 47%
9 PM 27° Mostly Clear 29% 8 mph WNW 50%
10 PM 26° Mostly Clear 21% 8 mph NW 52%
11 PM 25° Mostly Clear 21% 8 mph NW 52%
12 AM 24° Mostly Clear 21% 7 mph NW 55%
1 AM 24° Clear 15% 6 mph NW 58%
2 AM 23° Clear 3% 6 mph NW 60%
3 AM 22° Mostly Clear 3% 6 mph NNW 62%
4 AM 22° Partly Cloudy 3% 6 mph NNW 63%
5 AM 20° Partly Cloudy 3% 6 mph NNW 62%
6 AM 21° Partly Cloudy 3% 6 mph NNW 60%
7 AM 22° Partly Cloudy 3% 6 mph N 55%
8 AM 23° Partly Cloudy 3% 6 mph NNW 50%
9 AM 23° Partly Cloudy 3% 5 mph NNW 44%
10 AM 24° Partly Cloudy 3% 6 mph NW 38%
11 AM 25° Partly Cloudy 3% 6 mph NW 35%
12 PM 26° Partly Cloudy 3% 6 mph NW 33%
1 PM 26° Partly Cloudy 3% 6 mph NW 30%
2 PM 27° Partly Cloudy 3% 6 mph WNW 30%
3 PM 27° Partly Cloudy 3% 6 mph WNW 30%
4 PM 27° Partly Cloudy 3% 6 mph WNW 30%
5 PM 28° Partly Cloudy 3% 5 mph WNW 33%
6 PM 28° Partly Cloudy 3% 5 mph WNW 36%
15-Day Forecast
Today
7/16
Mostly Clear
21%
20°
29°
Fri
7/17
Partly Cloudy
15%
20°
28°
Sat
7/18
Heavy Rain
83%
21°
26°
Sun
7/19
Clear
48%
18°
27°
Mon
7/20
Mostly Clear
14%
17°
26°
Tue
7/21
Heavy Rain
90%
20°
27°
Wed
7/22
Rain
90%
18°
26°
Thu
7/23
Clear
53%
17°
26°
Fri
7/24
Drizzle
44%
18°
26°
Sat
7/25
Rain
66%
21°
26°
Sun
7/26
Drizzle
51%
20°
31°
Mon
7/27
Drizzle
60%
20°
31°
Tue
7/28
Drizzle
60%
20°
25°
Wed
7/29
Drizzle
60%
20°
26°
Thu
7/30
Drizzle
60%
20°
26°
255
Very Unhealthy
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Health alert: the risk of health effects is increased for everyone.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
255 AQI 179.6 µg/m³
O3
Ground-level ozone
54 AQI 57 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Fri 255 Very Unhealthy 54 255
Sat 63 Moderate 46 63
Sun 124 Unhealthy for Sensitive Groups 47 124
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 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Thu Jul 16, 22:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 90 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE2 J/kg
MUCAPE1 J/kg
SBCIN-5502 J/kg
MLCIN0 J/kg
Lifted Index0.1
Kinematics
0–6 km Shear54 kt
0–1 km Shear16 kt
Eff. Shear—
0–1 km SRH-46
0–3 km SRH-144
Eff. SRH—
Storm Motion267° @ 41 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado-0.0
STP (eff)—
Supercell—
K-Index-2.6
Thermo & Levels
PWAT0.98 in
0–3 km LR6.2 °C/km
700–500 LR6.7 °C/km
Total Totals41.2
LCL848 hPa
LFC—
EL—
Freezing Lvl14,606 ft