Greenwich, Connecticut

Last updated: 6:18 PM CDT  ·  Refresh
23°C
Feels like 25°
Rain
▲ 26°  /  ▼ 18°
Wind
6 mph NW
Humidity
83%
Dew Point
20°
Pressure
29.52 inHg
Visibility
8 mi
UV Index
1.8
Cloud Cover
72%
Sunrise
5:47 AM
Sunset
8:13 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Greenwich is currently rain at 23°C. Precipitation is likely — peak probability 77% around 7 PM. Atmospheric instability is elevated (CAPE up to 898 J/kg) — isolated convective development possible. Sunrise: 5:47AM · Sunset: 8:13PM.

Alerts

No active alerts for this location.
42 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
76%
8 PM
23°
57%
9 PM
22°
57%
10 PM
22°
54%
11 PM
21°
59%
12 AM
21°
45%
1 AM
20°
47%
2 AM
20°
38%
3 AM
20°
38%
4 AM
20°
33%
5 AM
18°
37%
6 AM
18°
42%
7 AM
18°
51%
8 AM
19°
57%
9 AM
20°
56%
10 AM
21°
63%
11 AM
21°
54%
12 PM
21°
54%
1 PM
23°
49%
2 PM
24°
46%
3 PM
24°
38%
4 PM
24°
35%
5 PM
24°
29%
6 PM
24°
18%
7-Day Forecast
Tonight
26° 18°
Rain, 76% chance.
Thu
26° 18°
Mostly Cloudy with a 63% chance of rain.
Fri
29° 18°
Mostly Clear with a 31% chance of rain.
Sat
33° 21°
Mostly Cloudy with a 49% chance of rain.
Sun
31° 22°
Rain, 74% chance.
Mon
30° 19°
Rain, 67% chance.
Tue
33° 19°
Clear with a 25% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 23° Rain 76% 6 mph NW 83%
8 PM 23° Rain 57% 4 mph NW 85%
9 PM 22° Partly Cloudy 57% 4 mph NW 88%
10 PM 22° Partly Cloudy 54% 4 mph NW 90%
11 PM 21° Partly Cloudy 59% 4 mph NW 91%
12 AM 21° Partly Cloudy 45% 4 mph NW 92%
1 AM 20° Partly Cloudy 47% 4 mph NW 92%
2 AM 20° Mostly Cloudy 38% 4 mph NW 91%
3 AM 20° Mostly Cloudy 38% 4 mph NW 91%
4 AM 20° Overcast 33% 4 mph NW 91%
5 AM 18° Mostly Cloudy 37% 5 mph NNW 91%
6 AM 18° Mostly Cloudy 42% 6 mph NNW 91%
7 AM 18° Fog 51% 6 mph N 91%
8 AM 19° Haze 57% 6 mph N 90%
9 AM 20° Mostly Cloudy 56% 6 mph N 87%
10 AM 21° Mostly Cloudy 63% 7 mph N 83%
11 AM 21° Mostly Cloudy 54% 8 mph N 82%
12 PM 21° Mostly Cloudy 54% 9 mph N 84%
1 PM 23° Mostly Cloudy 49% 10 mph N 86%
2 PM 24° Mostly Cloudy 46% 10 mph N 85%
3 PM 24° Mostly Cloudy 38% 10 mph N 81%
4 PM 24° Partly Cloudy 35% 9 mph N 78%
5 PM 24° Partly Cloudy 29% 8 mph N 76%
6 PM 24° Partly Cloudy 18% 7 mph N 78%
15-Day Forecast
Today
7/29
Rain
76%
18°
26°
Thu
7/30
Mostly Cloudy
63%
18°
26°
Fri
7/31
Mostly Clear
31%
18°
29°
Sat
8/1
Mostly Cloudy
49%
21°
33°
Sun
8/2
Rain
74%
22°
31°
Mon
8/3
Rain
67%
19°
30°
Tue
8/4
Clear
25%
19°
33°
Wed
8/5
Partly Cloudy
16%
21°
34°
Thu
8/6
Drizzle
39%
22°
34°
Fri
8/7
Rain
83%
22°
34°
Sat
8/8
Drizzle
59%
22°
33°
Sun
8/9
Drizzle
60%
22°
34°
Mon
8/10
Drizzle
60%
21°
32°
Tue
8/11
Drizzle
60%
20°
31°
Wed
8/12
Rain
90%
20°
31°
42
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
24 AQI 4.4 µg/m³
O3
Ground-level ozone
Dominant
42 AQI 46 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 42 Good 42 24
Fri 30 Good 30 12
Sat 48 Good 48 26
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 Wed Jul 29, 22:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1180 J/kg
MLCAPE688 J/kg
MUCAPE1180 J/kg
SBCIN-21 J/kg
MLCIN0 J/kg
Lifted Index-4.5
Kinematics
0–6 km Shear17 kt
0–1 km Shear14 kt
Eff. Shear18 kt
0–1 km SRH-55
0–3 km SRH-73
Eff. SRH-73
Storm Motion181° @ 13 kt
0–1 km EHI-0.4
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index35.2
Thermo & Levels
PWAT1.62 in
0–3 km LR6.2 °C/km
700–500 LR6.0 °C/km
Total Totals49.0
LCL952 hPa
LFC903 hPa
EL256 hPa
Freezing Lvl12,572 ft