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Current weather in Greenwich is few clouds.

Where can I find the hourly weather forecast for Greenwich?

This page shows hourly weather forecast for Greenwich, including temperature, wind, precipitation, humidity and cloud cover.

Is the weather forecast for Greenwich updated regularly?

Weather data for Greenwich is updated regularly with the latest available observations and forecasts.

Now · 5:18 AM

Greenwich Weather & Hourly Forecast

United States · Connecticut · 06830

63°F

Mostly clear night

Feels like: 64°F

💧 Humidity 92% 🌡 Pressure 29.88 inHg 💨 Wind 4 mph 👁 Visibility 6.1 mi ☁ Clouds 17% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Greenwich

Today

6:00 AM

Partly cloudy night

62° 💧 0.000 in 💨 5 mph H 93%29.91 inHg

9:00 AM

Mostly sunny

66° 💧 0.011 in 💨 5 mph H 79%29.97 inHg

12:00 PM

Light rain

72° 💧 0.029 in 💨 6 mph H 66%29.97 inHg

3:00 PM

Light rain

70° 💧 0.030 in 💨 5 mph H 72%29.97 inHg

6:00 PM

Mostly sunny

70° 💧 0.006 in 💨 4 mph H 74%29.97 inHg

9:00 PM

Clear night

66° 💧 0.001 in 💨 3 mph H 82%30.03 inHg

Tomorrow

12:00 AM

Clear night

62° 💧 None 💨 5 mph H 77%30.06 inHg

3:00 AM

Clear night

60° 💧 None 💨 7 mph H 70%30.06 inHg

6:00 AM

Clear night

58° 💧 None 💨 7 mph H 77%30.09 inHg

9:00 AM

Sunny

66° 💧 None 💨 6 mph H 70%30.15 inHg

12:00 PM

Sunny

74° 💧 None 💨 8 mph H 47%30.15 inHg

3:00 PM

Sunny

77° 💧 None 💨 6 mph H 41%30.12 inHg

6:00 PM

Mostly sunny

76° 💧 None 💨 3 mph H 47%30.12 inHg

9:00 PM

Partly cloudy night

70° 💧 None 💨 3 mph H 73%30.15 inHg

Tuesday

12:00 AM

Clear night

66° 💧 None 💨 6 mph H 72%30.21 inHg

3:00 AM

Clear night

63° 💧 None 💨 5 mph H 78%30.21 inHg

Today

6:00 AM

Partly cloudy night

62° 💧 None 💨 5 mph H 93%29.91 inHg

7:00 AM

Overcast

62° 💧 None 💨 6 mph H 89%29.91 inHg

8:00 AM

Partly cloudy

63° 💧 0.000 in 💨 6 mph H 87%29.94 inHg

9:00 AM

Mostly sunny

66° 💧 0.000 in 💨 5 mph H 79%29.97 inHg

10:00 AM

Partly cloudy

69° 💧 0.000 in 💨 5 mph H 75%29.97 inHg

11:00 AM

Light rain

70° 💧 0.010 in 💨 7 mph H 71%29.97 inHg

12:00 PM

Light rain

72° 💧 0.004 in 💨 6 mph H 66%29.97 inHg

1:00 PM

Light rain

71° 💧 0.009 in 💨 6 mph H 68%29.97 inHg

2:00 PM

Light rain

70° 💧 0.016 in 💨 5 mph H 71%29.97 inHg

3:00 PM

Light rain

70° 💧 0.011 in 💨 5 mph H 72%29.97 inHg

4:00 PM

Light rain

70° 💧 0.013 in 💨 3 mph H 73%29.94 inHg

5:00 PM

Light rain

70° 💧 0.006 in 💨 3 mph H 73%29.97 inHg

6:00 PM

Mostly sunny

70° 💧 0.003 in 💨 4 mph H 74%29.97 inHg

7:00 PM

Sunny

68° 💧 0.002 in 💨 3 mph H 81%29.97 inHg

8:00 PM

Clear night

67° 💧 0.001 in 💨 1 mph H 82%30.00 inHg

9:00 PM

Clear night

66° 💧 0.001 in 💨 3 mph H 82%30.03 inHg

10:00 PM

Clear night

64° 💧 None 💨 5 mph H 79%30.03 inHg

11:00 PM

Clear night

63° 💧 None 💨 5 mph H 78%30.06 inHg

Tomorrow

12:00 AM

Clear night

62° 💧 None 💨 5 mph H 77%30.06 inHg

1:00 AM

Clear night

61° 💧 None 💨 6 mph H 74%30.06 inHg

2:00 AM

Clear night

60° 💧 None 💨 7 mph H 70%30.06 inHg

3:00 AM

Clear night

60° 💧 None 💨 7 mph H 70%30.06 inHg

4:00 AM

Clear night

59° 💧 None 💨 6 mph H 72%30.09 inHg

5:00 AM

Clear night

58° 💧 None 💨 6 mph H 74%30.09 inHg

6:00 AM

Clear night

58° 💧 None 💨 7 mph H 77%30.09 inHg

7:00 AM

Sunny

59° 💧 None 💨 7 mph H 78%30.12 inHg

8:00 AM

Sunny

62° 💧 None 💨 8 mph H 76%30.12 inHg

9:00 AM

Sunny

66° 💧 None 💨 6 mph H 70%30.15 inHg

10:00 AM

Sunny

70° 💧 None 💨 7 mph H 60%30.15 inHg

11:00 AM

Sunny

73° 💧 None 💨 8 mph H 52%30.15 inHg

12:00 PM

Sunny

74° 💧 None 💨 8 mph H 47%30.15 inHg

1:00 PM

Sunny

76° 💧 None 💨 9 mph H 42%30.15 inHg

2:00 PM

Sunny

76° 💧 None 💨 7 mph H 40%30.12 inHg

3:00 PM

Sunny

77° 💧 None 💨 6 mph H 41%30.12 inHg

4:00 PM

Sunny

77° 💧 None 💨 5 mph H 42%30.12 inHg

5:00 PM

Sunny

77° 💧 None 💨 3 mph H 42%30.12 inHg

6:00 PM

Mostly sunny

76° 💧 None 💨 3 mph H 47%30.12 inHg

7:00 PM

Sunny

73° 💧 None 💨 2 mph H 62%30.12 inHg

8:00 PM

Mostly clear night

71° 💧 None 💨 2 mph H 69%30.12 inHg

9:00 PM

Partly cloudy night

70° 💧 None 💨 3 mph H 73%30.15 inHg

10:00 PM

Mostly cloudy night

69° 💧 None 💨 3 mph H 72%30.18 inHg

11:00 PM

Mostly clear night

67° 💧 None 💨 5 mph H 75%30.18 inHg

Tuesday

12:00 AM

Clear night

66° 💧 None 💨 6 mph H 72%30.21 inHg

1:00 AM

Clear night

64° 💧 None 💨 5 mph H 75%30.21 inHg

2:00 AM

Clear night

64° 💧 None 💨 5 mph H 77%30.21 inHg

3:00 AM

Clear night

63° 💧 None 💨 5 mph H 78%30.21 inHg

4:00 AM

Clear night

62° 💧 None 💨 4 mph H 79%30.21 inHg

5:00 AM

Partly cloudy night

62° 💧 None 💨 4 mph H 81%30.21 inHg

6:00 AM

Partly cloudy night

61° 💧 None 💨 4 mph H 82%30.21 inHg

7:00 AM

Mostly cloudy

61° 💧 None 💨 5 mph H 82%30.24 inHg

8:00 AM

Mostly cloudy

64° 💧 None 💨 5 mph H 77%30.24 inHg

9:00 AM

Mostly cloudy

67° 💧 None 💨 4 mph H 70%30.24 inHg

10:00 AM

Partly cloudy

71° 💧 None 💨 4 mph H 63%30.24 inHg

11:00 AM

Mostly cloudy

74° 💧 None 💨 3 mph H 56%30.24 inHg

12:00 PM

Mostly cloudy

76° 💧 None 💨 3 mph H 48%30.24 inHg

1:00 PM

Partly cloudy

78° 💧 None 💨 4 mph H 45%30.21 inHg

2:00 PM

Sunny

79° 💧 None 💨 4 mph H 44%30.21 inHg

3:00 PM

Mostly sunny

80° 💧 None 💨 3 mph H 46%30.18 inHg

4:00 PM

Mostly cloudy

80° 💧 None 💨 2 mph H 47%30.18 inHg

5:00 PM

Mostly sunny

80° 💧 None 💨 0 mph H 47%30.18 inHg

6:00 PM

Mostly sunny

79° 💧 None 💨 3 mph H 50%30.18 inHg

7:00 PM

Mostly cloudy

75° 💧 None 💨 3 mph H 63%30.21 inHg

8:00 PM

Mostly cloudy night

74° 💧 None 💨 4 mph H 65%30.21 inHg

11:00 PM

Mostly clear night

70° 💧 None 💨 5 mph H 76%30.24 inHg

Wednesday

2:00 AM

Mostly cloudy night

68° 💧 None 💨 3 mph H 88%30.21 inHg

5:00 AM

Mostly cloudy night

67° 💧 None 💨 4 mph H 83%30.21 inHg

8:00 AM

Partly cloudy

69° 💧 None 💨 5 mph H 76%30.21 inHg

11:00 AM

Mostly sunny

78° 💧 None 💨 7 mph H 56%30.18 inHg

2:00 PM

Mostly sunny

84° 💧 None 💨 11 mph H 44%30.09 inHg

5:00 PM

Overcast

81° 💧 None 💨 12 mph H 56%30.00 inHg

8:00 PM

Partly cloudy night

75° 💧 None 💨 12 mph H 80%29.94 inHg

11:00 PM

Mostly clear night

76° 💧 None 💨 12 mph H 76%29.91 inHg

Thursday

2:00 AM

Overcast night

77° 💧 None 💨 11 mph H 74%29.85 inHg

5:00 AM

Partly cloudy night

74° 💧 None 💨 10 mph H 86%29.83 inHg

8:00 AM

Overcast

74° 💧 None 💨 8 mph H 82%29.83 inHg

11:00 AM

Overcast

79° 💧 None 💨 8 mph H 72%29.83 inHg

2:00 PM

Overcast

80° 💧 None 💨 11 mph H 58%29.80 inHg

5:00 PM

Light rain

75° 💧 None 💨 9 mph H 65%29.77 inHg

8:00 PM

Overcast night

73° 💧 None 💨 7 mph H 72%29.77 inHg

11:00 PM

Mostly cloudy night

70° 💧 None 💨 6 mph H 86%29.80 inHg

Friday

2:00 AM

Clear night

66° 💧 None 💨 5 mph H 82%29.80 inHg

5:00 AM

Clear night

63° 💧 None 💨 6 mph H 82%29.83 inHg

8:00 AM

Sunny

63° 💧 None 💨 8 mph H 70%29.88 inHg

11:00 AM

Mostly sunny

69° 💧 None 💨 7 mph H 52%29.91 inHg

2:00 PM

Sunny

74° 💧 None 💨 6 mph H 43%29.85 inHg

5:00 PM

Sunny

76° 💧 None 💨 6 mph H 41%29.85 inHg

8:00 PM

Mostly cloudy night

69° 💧 None 💨 4 mph H 54%29.91 inHg

Saturday

2:00 AM

Mostly clear night

61° 💧 None 💨 5 mph H 73%30.00 inHg

8:00 AM

Mostly sunny

61° 💧 None 💨 3 mph H 72%30.06 inHg

2:00 PM

Mostly sunny

79° 💧 None 💨 3 mph H 40%30.03 inHg

8:00 PM

Clear night

72° 💧 None 💨 7 mph H 64%30.06 inHg

Sunday

2:00 AM

Mostly clear night

69° 💧 None 💨 4 mph H 82%30.12 inHg

8:00 AM

Mostly sunny

70° 💧 None 💨 3 mph H 79%30.15 inHg

2:00 PM

Mostly cloudy

83° 💧 None 💨 8 mph H 55%30.12 inHg

8:00 PM

Mostly cloudy night

75° 💧 None 💨 8 mph H 78%30.12 inHg

Monday

2:00 AM

Mostly clear night

73° 💧 None 💨 7 mph H 84%30.09 inHg

8:00 AM

Overcast

74° 💧 None 💨 8 mph H 90%30.09 inHg

2:00 PM

Sunny

92° 💧 None 💨 9 mph H 51%29.97 inHg

8:00 PM

Mostly clear night

87° 💧 None 💨 2 mph H 64%29.91 inHg

Tuesday

2:00 AM

Mostly clear night

78° 💧 None 💨 3 mph H 83%29.97 inHg

8:00 AM

Partly cloudy

75° 💧 None 💨 8 mph H 88%30.00 inHg

2:00 PM

Sunny

90° 💧 None 💨 6 mph H 57%29.91 inHg

8:00 PM

Severe thunderstorms

82° 💧 None 💨 5 mph H 81%29.85 inHg

Wednesday

2:00 AM

Partly cloudy night

74° 💧 None 💨 7 mph H 94%29.88 inHg

8:00 AM

Mostly sunny

66° 💧 None 💨 7 mph H 74%30.00 inHg

2:00 PM

Mostly sunny

76° 💧 None 💨 7 mph H 50%30.03 inHg

8:00 PM

Mostly clear night

67° 💧 None 💨 8 mph H 57%30.12 inHg

Thursday

2:00 AM

Partly cloudy night

58° 💧 None 💨 9 mph H 66%30.21 inHg

8:00 AM

Partly cloudy

57° 💧 None 💨 6 mph H 75%30.27 inHg

2:00 PM

Overcast

67° 💧 None 💨 6 mph H 51%30.27 inHg

8:00 PM

Overcast night

63° 💧 None 💨 3 mph H 64%30.21 inHg

Friday

2:00 AM

Mostly clear night

61° 💧 None 💨 5 mph H 77%30.21 inHg

8:00 AM

Sunny

63° 💧 None 💨 6 mph H 79%30.21 inHg

2:00 PM

Mostly sunny

68° 💧 None 💨 7 mph H 58%30.15 inHg

8:00 PM

Clear night

64° 💧 None 💨 5 mph H 69%30.12 inHg

Saturday

2:00 AM

Overcast night

60° 💧 None 💨 3 mph H 86%30.06 inHg

8:00 AM

Overcast

63° 💧 None 💨 4 mph H 89%30.00 inHg

2:00 PM

Overcast

77° 💧 None 💨 6 mph H 54%29.91 inHg

8:00 PM

Partly cloudy night

71° 💧 None 💨 6 mph H 82%29.85 inHg

Sunday

2:00 AM

Overcast night

69° 💧 None 💨 7 mph H 95%29.83 inHg

8:00 AM

Sunny

64° 💧 None 💨 8 mph H 79%29.94 inHg

2:00 PM

Sunny

74° 💧 None 💨 7 mph H 35%29.94 inHg

8:00 PM

Clear night

68° 💧 None 💨 8 mph H 44%30.00 inHg

In Greenwich and, more broadly, across the state of Connecticut: This evening will feature a mix of sun and clouds, with temperatures remaining mild between 68 and 71 degrees Fahrenheit. A brief period of rain is possible, with an expected accumulation of around 0.04 inches. The rain could occur at any time during the night, so keep an umbrella handy just in case. Winds will be light, coming from the northeast at around 5 mph, with occasional gusts reaching up to 16 mph. Overall, expect a fairly tranquil evening with mild temperatures and a slight chance of rain.

15-Day Weather Outlook for Greenwich

TomorrowTomorrow

Mostly sunny 77°/58° 💧 None 💨 8 mph

Tuesday, Sep 8Tue Sep 8

Partly cloudy 81°/61° 💧 0.039 in 💨 5 mph

Wednesday, Sep 9Wed Sep 9

Partly cloudy 84°/67° 💧 None 💨 12 mph

Thursday, Sep 10Thu Sep 10

Moderate rain 83°/73° 💧 0.172 in 💨 12 mph

Friday, Sep 11Fri Sep 11

Overcast 76°/65° 💧 0.038 in 💨 9 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 78°/62° 💧 0.137 in 💨 9 mph

Sunday, Sep 13Sun Sep 13

Partly cloudy 76°/65° 💧 None 💨 6 mph

Monday, Sep 14Mon Sep 14

Mostly cloudy 80°/71° 💧 None 💨 9 mph

Tuesday, Sep 15Tue Sep 15

Moderate rain 81°/59° 💧 1.504 in 💨 15 mph

Wednesday, Sep 16Wed Sep 16

Sunny 69°/57° 💧 None 💨 12 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 70°/59° 💧 None 💨 6 mph

Friday, Sep 18Fri Sep 18

Partly cloudy 75°/60° 💧 None 💨 6 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 74°/60° 💧 0.019 in 💨 4 mph

Sunday, Sep 20Sun Sep 20

Light rain 73°/65° 💧 0.052 in 💨 8 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Greenwich

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Greenwich

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 6:00 AM

PM2.5 Fine particles Good 3,7µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 5,4µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Good 28,9µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 10,4µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in Greenwich

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 6,2High 😊Good

Tomorrow UV 6,4High 😐Moderate

Tuesday UV 6,1High 😐Moderate

Wednesday UV 3,1Moderate 😐Moderate

Thursday UV 7,0High 🙂Fair

Friday UV 6,0High —Unavailable

Saturday UV 6,0High —Unavailable

Hourly UV index today

7:00 AMUV 0,0 8:00 AMUV 0,4 9:00 AMUV 0,7 10:00 AMUV 1,4 11:00 AMUV 4,1 12:00 PMUV 5,5 1:00 PMUV 6,2 2:00 PMUV 5,1 3:00 PMUV 4,4 4:00 PMUV 2,7 5:00 PMUV 1,3 6:00 PMUV 0,4

Today's weather health advice Open today's recommendations.

Strong UV exposure

Protect exposed skin with SPF 30+ sunscreen, wear sunglasses, and try to limit direct midday sun.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for Greenwich

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · GREENWICH, CONNECTICUT

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 2:00 AM–3:00 AM.

100/100Best-hour score

BEST TIME TONIGHT 2:00 AM–3:00 AM Astronomical darkness: 8:54 PM–4:52 AM

☁ Cloud cover 0% Real hourly forecast for the best viewing hour.

☾ Moonlight 22% Waning Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 56° high at the best hour.

✦ Estimated visible meteors 1–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min75%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

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Forecast data for Greenwich were last refreshed today at 5:18 AM. The current forecast period extends through 08/09/2026 at 3:00 AM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.