Greenwich, Connecticut

Last updated: 5:58 PM CDT  ·  Refresh
24°C
Feels like 27°
Partly Cloudy
▲ 24°  /  ▼ 18°
Wind
3 mph SSW
Humidity
88%
Dew Point
22°
Pressure
29.77 inHg
Visibility
10 mi
UV Index
0.7
Cloud Cover
49%
Sunrise
6:33 AM
Sunset
7:06 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Greenwich is currently partly cloudy at 24°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 832 J/kg) — isolated convective development possible. Sunrise: 6:33AM · Sunset: 7:06PM.

Alerts

No active alerts for this location.
46 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
33%
7 PM
24°
27%
8 PM
23°
23%
9 PM
22°
25%
10 PM
22°
25%
11 PM
22°
26%
12 AM
22°
17%
1 AM
22°
17%
2 AM
22°
17%
3 AM
22°
10%
4 AM
20°
8%
5 AM
19°
11%
6 AM
19°
10%
7 AM
18°
4%
8 AM
18°
4%
9 AM
19°
3%
10 AM
19°
3%
11 AM
19°
3%
12 PM
20°
3%
1 PM
21°
3%
2 PM
21°
3%
3 PM
21°
3%
4 PM
21°
3%
5 PM
21°
3%
7-Day Forecast
Tonight
24° 18°
Partly Cloudy with a 33% chance of rain.
Mon
23° 14°
Mostly Clear.
Tue
22° 12°
Clear.
Wed
23° 16°
Partly Cloudy.
Thu
24° 19°
Partly Cloudy.
Fri
23° 18°
Rain, 71% chance.
Sat
26° 17°
Mostly Cloudy with a 52% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 24° Partly Cloudy 33% 3 mph SSW 88%
7 PM 24° Mostly Clear 27% 4 mph SSW 89%
8 PM 23° Mostly Clear 23% 4 mph SSW 91%
9 PM 22° Partly Cloudy 25% 4 mph SW 91%
10 PM 22° Partly Cloudy 25% 5 mph WSW 92%
11 PM 22° Partly Cloudy 26% 5 mph WSW 93%
12 AM 22° Mostly Cloudy 17% 5 mph WSW 93%
1 AM 22° Mostly Cloudy 17% 6 mph W 93%
2 AM 22° Mostly Cloudy 17% 7 mph WNW 91%
3 AM 22° Mostly Cloudy 10% 9 mph NW 89%
4 AM 20° Mostly Cloudy 8% 10 mph NW 86%
5 AM 19° Mostly Cloudy 11% 10 mph NW 81%
6 AM 19° Partly Cloudy 10% 10 mph NNW 76%
7 AM 18° Partly Cloudy 4% 10 mph NNW 72%
8 AM 18° Mostly Clear 4% 11 mph NNW 67%
9 AM 19° Clear 3% 11 mph NNW 63%
10 AM 19° Clear 3% 11 mph NNW 59%
11 AM 19° Clear 3% 11 mph NNW 56%
12 PM 20° Clear 3% 12 mph NNW 52%
1 PM 21° Clear 3% 12 mph NNW 49%
2 PM 21° Clear 3% 11 mph NNW 49%
3 PM 21° Clear 3% 11 mph NNW 49%
4 PM 21° Clear 3% 11 mph NNW 49%
5 PM 21° Clear 3% 11 mph NNW 51%
15-Day Forecast
Today
9/13
Partly Cloudy
33%
18°
24°
Mon
9/14
Mostly Clear
17%
14°
23°
Tue
9/15
Clear
3%
12°
22°
Wed
9/16
Partly Cloudy
7%
16°
23°
Thu
9/17
Partly Cloudy
17%
19°
24°
Fri
9/18
Rain
71%
18°
23°
Sat
9/19
Mostly Cloudy
52%
17°
26°
Sun
9/20
Rain
79%
14°
21°
Mon
9/21
Drizzle
68%
14°
20°
Tue
9/22
Drizzle
68%
14°
21°
Wed
9/23
Drizzle
60%
14°
19°
Thu
9/24
Clear
60%
14°
21°
Fri
9/25
Drizzle
60%
14°
21°
Sat
9/26
Clear
60%
14°
20°
Sun
9/27
Drizzle
60%
14°
19°
46
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
16 AQI 2.9 µg/m³
O3
Ground-level ozone
Dominant
46 AQI 51 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 46 Good 46 16
Tue 30 Good 30 9
Wed 30 Good 30 6
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 Sun Sep 13, 21:00'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
SBCAPE612 J/kg
MLCAPE377 J/kg
MUCAPE612 J/kg
SBCIN-16 J/kg
MLCIN-7 J/kg
Lifted Index-1.9
Kinematics
0–6 km Shear37 kt
0–1 km Shear11 kt
Eff. Shear35 kt
0–1 km SRH4
0–3 km SRH7
Eff. SRH7
Storm Motion311° @ 26 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.1
K-Index19.5
Thermo & Levels
PWAT1.54 in
0–3 km LR5.0 °C/km
700–500 LR5.6 °C/km
Total Totals43.5
LCL979 hPa
LFC937 hPa
EL245 hPa
Freezing Lvl14,357 ft