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Current weather in Groton is clear sky.

Where can I find the hourly weather forecast for Groton?

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

Is the weather forecast for Groton updated regularly?

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

Now · 4:19 AM

Groton Weather & Hourly Forecast

United States · South Dakota · 57445

57°F

Clear night

Feels like: 52°F

💧 Humidity 85% 🌡 Pressure 30.24 inHg 💨 Wind 10 mph 👁 Visibility 24.2 mi ☁ Clouds 9% ☀️ UV index 0.0 · Low 🌅 Sunrise 7:19 AM 🌇 Sunset 7:29 PM

Hourly Forecast for Groton

Today

5:00 AM

Clear night

56° 💧 None 💨 10 mph H 90%30.24 inHg

8:00 AM

Mostly sunny

57° 💧 None 💨 11 mph H 85%30.24 inHg

11:00 AM

Overcast

62° 💧 0.001 in 💨 16 mph H 73%30.24 inHg

2:00 PM

Overcast

65° 💧 None 💨 15 mph H 71%30.18 inHg

5:00 PM

Overcast

65° 💧 0.001 in 💨 14 mph H 73%30.15 inHg

8:00 PM

Overcast night

63° 💧 0.001 in 💨 13 mph H 77%30.15 inHg

11:00 PM

Overcast night

62° 💧 0.055 in 💨 13 mph H 78%30.15 inHg

Tomorrow

2:00 AM

Thunderstorms

61° 💧 0.419 in 💨 15 mph H 88%30.12 inHg

5:00 AM

Light rain

61° 💧 0.093 in 💨 13 mph H 90%30.09 inHg

8:00 AM

Mostly cloudy

61° 💧 0.001 in 💨 12 mph H 90%30.12 inHg

11:00 AM

Overcast

64° 💧 None 💨 11 mph H 81%30.12 inHg

2:00 PM

Overcast

66° 💧 0.001 in 💨 10 mph H 79%30.12 inHg

5:00 PM

Light rain

66° 💧 0.019 in 💨 6 mph H 82%30.12 inHg

8:00 PM

Overcast night

64° 💧 0.005 in 💨 6 mph H 91%30.15 inHg

11:00 PM

Mostly cloudy night

62° 💧 0.001 in 💨 5 mph H 92%30.18 inHg

Friday

2:00 AM

Overcast night

60° 💧 None 💨 3 mph H 95%30.18 inHg

Today

5:00 AM

Clear night

56° 💧 None 💨 10 mph H 90%30.24 inHg

6:00 AM

Mostly cloudy night

55° 💧 None 💨 10 mph H 90%30.24 inHg

7:00 AM

Mostly cloudy night

56° 💧 None 💨 10 mph H 88%30.24 inHg

8:00 AM

Mostly sunny

57° 💧 None 💨 11 mph H 85%30.24 inHg

9:00 AM

Mostly sunny

59° 💧 None 💨 11 mph H 82%30.24 inHg

10:00 AM

Overcast

61° 💧 None 💨 16 mph H 76%30.24 inHg

11:00 AM

Overcast

62° 💧 0.000 in 💨 16 mph H 73%30.24 inHg

12:00 PM

Overcast

64° 💧 0.000 in 💨 16 mph H 70%30.24 inHg

1:00 PM

Overcast

65° 💧 None 💨 16 mph H 69%30.21 inHg

2:00 PM

Overcast

65° 💧 None 💨 15 mph H 71%30.18 inHg

3:00 PM

Overcast

64° 💧 None 💨 15 mph H 73%30.18 inHg

4:00 PM

Overcast

65° 💧 None 💨 15 mph H 72%30.15 inHg

5:00 PM

Overcast

65° 💧 None 💨 14 mph H 73%30.15 inHg

6:00 PM

Overcast

64° 💧 None 💨 12 mph H 75%30.15 inHg

7:00 PM

Overcast

63° 💧 0.001 in 💨 13 mph H 76%30.15 inHg

8:00 PM

Overcast night

63° 💧 0.001 in 💨 13 mph H 77%30.15 inHg

9:00 PM

Overcast night

63° 💧 None 💨 14 mph H 77%30.15 inHg

10:00 PM

Overcast night

63° 💧 None 💨 13 mph H 77%30.15 inHg

11:00 PM

Overcast night

62° 💧 0.003 in 💨 13 mph H 78%30.15 inHg

Tomorrow

12:00 AM

Light rain

62° 💧 0.005 in 💨 13 mph H 79%30.12 inHg

1:00 AM

Light thunderstorms

62° 💧 0.047 in 💨 13 mph H 84%30.12 inHg

2:00 AM

Thunderstorms

61° 💧 0.171 in 💨 15 mph H 88%30.12 inHg

3:00 AM

Moderate rain

61° 💧 0.117 in 💨 17 mph H 89%30.09 inHg

4:00 AM

Moderate rain

61° 💧 0.132 in 💨 17 mph H 89%30.09 inHg

5:00 AM

Light rain

61° 💧 0.089 in 💨 13 mph H 90%30.09 inHg

6:00 AM

Light rain

60° 💧 0.004 in 💨 10 mph H 92%30.12 inHg

7:00 AM

Overcast night

60° 💧 None 💨 11 mph H 91%30.12 inHg

8:00 AM

Mostly cloudy

61° 💧 0.001 in 💨 12 mph H 90%30.12 inHg

9:00 AM

Overcast

62° 💧 None 💨 12 mph H 88%30.12 inHg

10:00 AM

Overcast

63° 💧 None 💨 10 mph H 86%30.12 inHg

11:00 AM

Overcast

64° 💧 None 💨 11 mph H 81%30.12 inHg

12:00 PM

Overcast

66° 💧 None 💨 13 mph H 79%30.15 inHg

1:00 PM

Overcast

66° 💧 None 💨 12 mph H 79%30.12 inHg

2:00 PM

Overcast

66° 💧 None 💨 10 mph H 79%30.12 inHg

3:00 PM

Overcast

67° 💧 None 💨 8 mph H 78%30.12 inHg

4:00 PM

Overcast

67° 💧 0.001 in 💨 7 mph H 79%30.12 inHg

5:00 PM

Light rain

66° 💧 0.007 in 💨 6 mph H 82%30.12 inHg

6:00 PM

Light rain

65° 💧 0.007 in 💨 5 mph H 87%30.12 inHg

7:00 PM

Light rain

65° 💧 0.005 in 💨 5 mph H 90%30.12 inHg

8:00 PM

Overcast night

64° 💧 0.002 in 💨 6 mph H 91%30.15 inHg

9:00 PM

Overcast night

63° 💧 0.002 in 💨 5 mph H 91%30.15 inHg

10:00 PM

Overcast night

62° 💧 0.001 in 💨 5 mph H 92%30.18 inHg

11:00 PM

Mostly cloudy night

62° 💧 None 💨 5 mph H 92%30.18 inHg

Friday

12:00 AM

Overcast night

61° 💧 0.001 in 💨 5 mph H 93%30.18 inHg

1:00 AM

Overcast night

60° 💧 None 💨 4 mph H 94%30.18 inHg

2:00 AM

Overcast night

60° 💧 None 💨 3 mph H 95%30.18 inHg

3:00 AM

Overcast night

59° 💧 None 💨 4 mph H 97%30.18 inHg

4:00 AM

Overcast night

58° 💧 None 💨 4 mph H 97%30.18 inHg

5:00 AM

Mostly cloudy night

59° 💧 None 💨 4 mph H 96%30.18 inHg

6:00 AM

Mostly cloudy night

59° 💧 None 💨 4 mph H 96%30.18 inHg

7:00 AM

Overcast night

58° 💧 None 💨 4 mph H 97%30.18 inHg

8:00 AM

Overcast

60° 💧 None 💨 6 mph H 94%30.18 inHg

9:00 AM

Overcast

62° 💧 None 💨 7 mph H 89%30.18 inHg

10:00 AM

Overcast

63° 💧 0.001 in 💨 8 mph H 88%30.18 inHg

11:00 AM

Overcast

65° 💧 None 💨 10 mph H 82%30.18 inHg

12:00 PM

Overcast

67° 💧 None 💨 10 mph H 78%30.15 inHg

1:00 PM

Overcast

68° 💧 0.001 in 💨 11 mph H 75%30.12 inHg

2:00 PM

Overcast

70° 💧 0.003 in 💨 12 mph H 74%30.12 inHg

3:00 PM

Overcast

69° 💧 None 💨 12 mph H 75%30.09 inHg

4:00 PM

Overcast

68° 💧 None 💨 12 mph H 75%30.09 inHg

5:00 PM

Overcast

69° 💧 None 💨 12 mph H 73%30.06 inHg

6:00 PM

Overcast

69° 💧 None 💨 12 mph H 75%30.06 inHg

7:00 PM

Overcast

67° 💧 0.001 in 💨 10 mph H 78%30.06 inHg

10:00 PM

Overcast night

65° 💧 None 💨 12 mph H 79%30.06 inHg

Saturday

1:00 AM

Light rain

63° 💧 None 💨 12 mph H 82%30.00 inHg

4:00 AM

Light rain

63° 💧 None 💨 12 mph H 83%29.97 inHg

7:00 AM

Overcast night

62° 💧 None 💨 10 mph H 89%29.94 inHg

10:00 AM

Overcast

63° 💧 None 💨 11 mph H 86%29.94 inHg

1:00 PM

Light rain

65° 💧 None 💨 9 mph H 89%29.91 inHg

4:00 PM

Light rain

66° 💧 None 💨 5 mph H 87%29.91 inHg

7:00 PM

Light rain

64° 💧 None 💨 3 mph H 93%29.94 inHg

10:00 PM

Overcast night

63° 💧 None 💨 4 mph H 95%29.97 inHg

Sunday

1:00 AM

Overcast night

62° 💧 None 💨 2 mph H 97%29.97 inHg

4:00 AM

Mostly clear night

60° 💧 None 💨 1 mph H 99%30.00 inHg

7:00 AM

Overcast night

59° 💧 None 💨 4 mph H 100%30.06 inHg

10:00 AM

Mostly sunny

60° 💧 None 💨 4 mph H 90%30.09 inHg

1:00 PM

Sunny

69° 💧 None 💨 4 mph H 71%30.09 inHg

4:00 PM

Mostly sunny

72° 💧 None 💨 5 mph H 60%30.03 inHg

7:00 PM

Sunny

66° 💧 None 💨 4 mph H 75%30.00 inHg

10:00 PM

Clear night

62° 💧 None 💨 7 mph H 88%30.00 inHg

Monday

1:00 AM

Overcast night

60° 💧 None 💨 9 mph H 91%29.97 inHg

4:00 AM

Mostly cloudy night

60° 💧 None 💨 10 mph H 93%29.91 inHg

7:00 AM

Overcast night

64° 💧 None 💨 14 mph H 87%29.85 inHg

10:00 AM

Overcast

65° 💧 None 💨 18 mph H 85%29.80 inHg

1:00 PM

Overcast

67° 💧 None 💨 16 mph H 82%29.77 inHg

4:00 PM

Overcast

72° 💧 None 💨 16 mph H 68%29.65 inHg

7:00 PM

Light rain

68° 💧 None 💨 12 mph H 77%29.68 inHg

Tuesday

1:00 AM

Light rain

61° 💧 None 💨 14 mph H 93%29.71 inHg

7:00 AM

Overcast night

53° 💧 None 💨 15 mph H 79%29.85 inHg

1:00 PM

Overcast

58° 💧 None 💨 16 mph H 64%29.91 inHg

7:00 PM

Sunny

57° 💧 None 💨 7 mph H 62%29.94 inHg

Wednesday

1:00 AM

Clear night

46° 💧 None 💨 4 mph H 84%29.97 inHg

7:00 AM

Clear night

42° 💧 None 💨 0 mph H 90%29.94 inHg

1:00 PM

Mostly cloudy

61° 💧 None 💨 3 mph H 47%29.88 inHg

7:00 PM

Overcast

58° 💧 None 💨 1 mph H 64%29.83 inHg

Thursday

1:00 AM

Light rain

53° 💧 None 💨 6 mph H 90%29.91 inHg

7:00 AM

Overcast night

51° 💧 None 💨 6 mph H 92%29.91 inHg

1:00 PM

Light rain

56° 💧 None 💨 11 mph H 82%29.97 inHg

7:00 PM

Overcast

55° 💧 None 💨 12 mph H 71%30.03 inHg

Friday

1:00 AM

Overcast night

52° 💧 None 💨 5 mph H 90%30.12 inHg

7:00 AM

Partly cloudy night

45° 💧 None 💨 1 mph H 99%30.15 inHg

1:00 PM

Overcast

57° 💧 None 💨 2 mph H 66%30.15 inHg

7:00 PM

Partly cloudy

56° 💧 None 💨 1 mph H 72%30.06 inHg

Saturday

1:00 AM

Overcast night

50° 💧 None 💨 5 mph H 87%30.09 inHg

7:00 AM

Overcast night

48° 💧 None 💨 4 mph H 92%30.09 inHg

1:00 PM

Mostly sunny

65° 💧 None 💨 7 mph H 51%30.09 inHg

7:00 PM

Sunny

60° 💧 None 💨 4 mph H 71%30.03 inHg

Sunday

1:00 AM

Mostly cloudy night

52° 💧 None 💨 5 mph H 90%30.03 inHg

7:00 AM

Overcast night

48° 💧 None 💨 4 mph H 97%30.03 inHg

1:00 PM

Overcast

64° 💧 None 💨 3 mph H 69%30.03 inHg

7:00 PM

Mostly cloudy

62° 💧 None 💨 2 mph H 71%29.97 inHg

Monday

1:00 AM

Mostly cloudy night

54° 💧 None 💨 6 mph H 88%29.94 inHg

7:00 AM

Mostly clear night

53° 💧 None 💨 7 mph H 83%29.88 inHg

1:00 PM

Mostly sunny

72° 💧 None 💨 11 mph H 65%29.83 inHg

7:00 PM

Sunny

72° 💧 None 💨 12 mph H 54%29.85 inHg

Tuesday

1:00 AM

Clear night

56° 💧 None 💨 11 mph H 61%30.09 inHg

7:00 AM

Mostly clear night

48° 💧 None 💨 9 mph H 70%30.21 inHg

1:00 PM

Sunny

60° 💧 None 💨 14 mph H 36%30.27 inHg

7:00 PM

Sunny

54° 💧 None 💨 9 mph H 44%30.24 inHg

Wednesday

1:00 AM

Clear night

45° 💧 None 💨 7 mph H 64%30.33 inHg

7:00 AM

Clear night

41° 💧 None 💨 7 mph H 75%30.39 inHg

1:00 PM

Mostly sunny

52° 💧 None 💨 10 mph H 47%30.39 inHg

7:00 PM

Sunny

48° 💧 None 💨 4 mph H 59%30.30 inHg

In Groton and, more broadly, across the state of South Dakota: This morning will start with mostly cloudy skies and cool temperatures around 52 to 56 degrees Fahrenheit. Winds will be coming from the east at about 10 mph, with gusts reaching up to 17 mph. There is a possibility of light rain throughout the day, with total accumulation around 0.16 inches. As the afternoon progresses, the cloudy conditions are expected to persist, and the chance of rain remains high. Temperatures are likely to stay in the same cool range, and breezes from the east will continue at similar speeds. Overall, it will be a damp, breezy day with limited sunshine. Be prepared for possible showers if you're heading outdoors.

15-Day Weather Outlook for Groton

TomorrowTomorrow

Light thunderstorms 67°/60° 💧 None 💨 17 mph

Friday, Sep 25Fri Sep 25

Overcast 70°/58° 💧 0.518 in 💨 12 mph

Saturday, Sep 26Sat Sep 26

Light rain 66°/62° 💧 0.491 in 💨 12 mph

Sunday, Sep 27Sun Sep 27

Overcast 72°/59° 💧 0.001 in 💨 7 mph

Monday, Sep 28Mon Sep 28

Light rain 72°/60° 💧 0.012 in 💨 18 mph

Tuesday, Sep 29Tue Sep 29

Light rain 61°/53° 💧 0.165 in 💨 16 mph

Wednesday, Sep 30Wed Sep 30

Mostly cloudy 61°/42° 💧 None 💨 4 mph

Thursday, Oct 1Thu Oct 1

Light rain 56°/51° 💧 0.323 in 💨 12 mph

Friday, Oct 2Fri Oct 2

Overcast 57°/45° 💧 0.013 in 💨 5 mph

Saturday, Oct 3Sat Oct 3

Overcast 65°/48° 💧 None 💨 7 mph

Sunday, Oct 4Sun Oct 4

Mostly cloudy 64°/48° 💧 None 💨 5 mph

Monday, Oct 5Mon Oct 5

Mostly cloudy 72°/53° 💧 None 💨 12 mph

Tuesday, Oct 6Tue Oct 6

Mostly sunny 60°/48° 💧 None 💨 14 mph

Wednesday, Oct 7Wed Oct 7

Mostly sunny 52°/41° 💧 None 💨 10 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Groton

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Groton

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 5:00 AM

PM2.5 Fine particles Good 2,0µg/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 2,1µg/m³

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

O₃ Ozone Good 44,4µg/m³

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

NO₂ Nitrogen dioxide Good 1,7µg/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 Groton

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 2,9Low 😊Good

Tomorrow UV 1,7Low 🙂Fair

Friday UV 1,5Low 😊Good

Saturday UV 2,1Low 🙂Fair

Sunday UV 6,0High 😊Good

Monday UV 5,0Moderate —Unavailable

Tuesday UV 3,0Moderate —Unavailable

Hourly UV index today

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

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

Low UV risk

UV radiation will be low, although basic protection is still advisable during prolonged exposure.

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 Groton

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · GROTON, SOUTH DAKOTA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 5:00 AM–6:00 AM.

96/100Best-hour score

BEST TIME TONIGHT 5:00 AM–6:00 AM Astronomical darkness: 9:09 PM–5:41 AM

☁ Cloud cover 3% Real hourly forecast for the best viewing hour.

☾ Moonlight 89% Waxing Gibbous · Moon below the horizon at the best viewing hour.

☄ Meteor activity Southern Taurids Reference ZHR 7 · Radiant 59° 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 min70%

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

SEP 20–NOV 20

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

ACTIVE NOW

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

NOV 6–NOV 30

LeonidsStart NOV 6 · Peak NOV 17 · End NOV 30 · ZHR 15 · 52% 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 Groton were last refreshed today at 4:19 AM. The current forecast period extends through 25/09/2026 at 2:00 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.