What is the weather in Grenville right now?

Current weather in Grenville is few clouds.

Where can I find the hourly weather forecast for Grenville?

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

Is the weather forecast for Grenville updated regularly?

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

Now · 4:33 PM

Grenville Weather & Hourly Forecast

United States · South Dakota · 57239

77°F

Mostly sunny

Feels like: 79°F

💧 Humidity 82% 🌡 Pressure 29.94 inHg 💨 Wind 12 mph 👁 Visibility 17.6 mi ☁ Clouds 34% ☀️ UV index 4.2 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Grenville

Today

5:00 PM

Mostly sunny

77° 💧 0.002 in 💨 12 mph H 82%29.94 inHg

8:00 PM

Clear night

73° 💧 0.000 in 💨 12 mph H 93%29.94 inHg

11:00 PM

Clear night

73° 💧 None 💨 13 mph H 90%29.97 inHg

Tomorrow

2:00 AM

Mostly clear night

72° 💧 None 💨 14 mph H 94%29.94 inHg

5:00 AM

Mostly clear night

72° 💧 0.002 in 💨 12 mph H 95%29.91 inHg

8:00 AM

Partly cloudy

73° 💧 0.070 in 💨 17 mph H 91%29.88 inHg

11:00 AM

Light thunderstorms

70° 💧 0.285 in 💨 16 mph H 95%29.91 inHg

2:00 PM

Light rain

74° 💧 0.015 in 💨 18 mph H 91%29.83 inHg

5:00 PM

Mostly cloudy

79° 💧 0.000 in 💨 20 mph H 81%29.74 inHg

8:00 PM

Mostly cloudy night

77° 💧 0.005 in 💨 20 mph H 81%29.74 inHg

11:00 PM

Partly cloudy night

77° 💧 0.000 in 💨 20 mph H 81%29.77 inHg

Tuesday

2:00 AM

Partly cloudy night

74° 💧 None 💨 16 mph H 81%29.77 inHg

5:00 AM

Clear night

72° 💧 None 💨 7 mph H 88%29.80 inHg

8:00 AM

Mostly sunny

71° 💧 None 💨 6 mph H 92%29.83 inHg

11:00 AM

Sunny

76° 💧 None 💨 13 mph H 56%29.88 inHg

2:00 PM

Sunny

79° 💧 None 💨 11 mph H 39%29.88 inHg

Today

5:00 PM

Mostly sunny

77° 💧 0.002 in 💨 12 mph H 82%29.94 inHg

6:00 PM

Mostly sunny

77° 💧 None 💨 13 mph H 81%29.94 inHg

7:00 PM

Sunny

74° 💧 None 💨 13 mph H 87%29.94 inHg

8:00 PM

Clear night

73° 💧 None 💨 12 mph H 93%29.94 inHg

9:00 PM

Clear night

74° 💧 0.000 in 💨 14 mph H 93%29.94 inHg

10:00 PM

Clear night

74° 💧 None 💨 13 mph H 91%29.94 inHg

11:00 PM

Clear night

73° 💧 None 💨 13 mph H 90%29.97 inHg

Tomorrow

12:00 AM

Clear night

73° 💧 None 💨 13 mph H 92%29.94 inHg

1:00 AM

Mostly clear night

72° 💧 None 💨 13 mph H 92%29.94 inHg

2:00 AM

Mostly clear night

72° 💧 None 💨 14 mph H 94%29.94 inHg

3:00 AM

Clear night

72° 💧 None 💨 13 mph H 95%29.91 inHg

4:00 AM

Clear night

72° 💧 None 💨 14 mph H 95%29.91 inHg

5:00 AM

Mostly clear night

72° 💧 0.000 in 💨 12 mph H 95%29.91 inHg

6:00 AM

Mostly clear night

72° 💧 0.000 in 💨 13 mph H 95%29.91 inHg

7:00 AM

Mostly sunny

72° 💧 0.001 in 💨 15 mph H 95%29.88 inHg

8:00 AM

Partly cloudy

73° 💧 0.001 in 💨 17 mph H 91%29.88 inHg

9:00 AM

Light thunderstorms

73° 💧 0.013 in 💨 9 mph H 90%29.88 inHg

10:00 AM

Light thunderstorms

70° 💧 0.056 in 💨 16 mph H 95%29.91 inHg

11:00 AM

Light thunderstorms

70° 💧 0.066 in 💨 16 mph H 95%29.91 inHg

12:00 PM

Thunderstorms

71° 💧 0.160 in 💨 19 mph H 93%29.88 inHg

1:00 PM

Light rain

72° 💧 0.059 in 💨 21 mph H 92%29.85 inHg

2:00 PM

Light rain

74° 💧 0.013 in 💨 18 mph H 91%29.83 inHg

3:00 PM

Overcast

77° 💧 0.001 in 💨 20 mph H 84%29.80 inHg

4:00 PM

Mostly cloudy

78° 💧 0.001 in 💨 22 mph H 80%29.77 inHg

5:00 PM

Mostly cloudy

79° 💧 0.000 in 💨 20 mph H 81%29.74 inHg

6:00 PM

Partly cloudy

79° 💧 None 💨 21 mph H 79%29.71 inHg

7:00 PM

Partly cloudy

78° 💧 None 💨 23 mph H 79%29.74 inHg

8:00 PM

Mostly cloudy night

77° 💧 0.003 in 💨 20 mph H 81%29.74 inHg

9:00 PM

Partly cloudy night

77° 💧 0.001 in 💨 20 mph H 80%29.74 inHg

10:00 PM

Mostly clear night

77° 💧 0.000 in 💨 20 mph H 81%29.74 inHg

11:00 PM

Partly cloudy night

77° 💧 0.000 in 💨 20 mph H 81%29.77 inHg

Tuesday

12:00 AM

Partly cloudy night

76° 💧 None 💨 19 mph H 82%29.74 inHg

1:00 AM

Mostly cloudy night

75° 💧 None 💨 18 mph H 81%29.77 inHg

2:00 AM

Partly cloudy night

74° 💧 None 💨 16 mph H 81%29.77 inHg

3:00 AM

Mostly cloudy night

73° 💧 None 💨 14 mph H 83%29.77 inHg

4:00 AM

Mostly clear night

73° 💧 None 💨 10 mph H 85%29.77 inHg

5:00 AM

Clear night

72° 💧 None 💨 7 mph H 88%29.80 inHg

6:00 AM

Clear night

70° 💧 None 💨 4 mph H 91%29.80 inHg

7:00 AM

Partly cloudy

69° 💧 None 💨 3 mph H 93%29.83 inHg

8:00 AM

Mostly sunny

71° 💧 None 💨 6 mph H 92%29.83 inHg

9:00 AM

Sunny

73° 💧 None 💨 9 mph H 88%29.85 inHg

10:00 AM

Sunny

75° 💧 None 💨 14 mph H 70%29.85 inHg

11:00 AM

Sunny

76° 💧 None 💨 13 mph H 56%29.88 inHg

12:00 PM

Sunny

77° 💧 None 💨 12 mph H 47%29.88 inHg

1:00 PM

Sunny

78° 💧 None 💨 10 mph H 41%29.88 inHg

2:00 PM

Sunny

79° 💧 None 💨 11 mph H 39%29.88 inHg

3:00 PM

Sunny

79° 💧 None 💨 12 mph H 38%29.88 inHg

4:00 PM

Sunny

80° 💧 None 💨 12 mph H 36%29.85 inHg

5:00 PM

Sunny

80° 💧 None 💨 12 mph H 36%29.85 inHg

6:00 PM

Sunny

78° 💧 None 💨 11 mph H 43%29.85 inHg

7:00 PM

Sunny

76° 💧 None 💨 11 mph H 45%29.85 inHg

8:00 PM

Clear night

73° 💧 None 💨 12 mph H 44%29.85 inHg

9:00 PM

Clear night

73° 💧 None 💨 13 mph H 40%29.88 inHg

10:00 PM

Clear night

71° 💧 None 💨 12 mph H 41%29.91 inHg

11:00 PM

Clear night

69° 💧 None 💨 11 mph H 44%29.91 inHg

Wednesday

12:00 AM

Clear night

68° 💧 None 💨 10 mph H 45%29.94 inHg

1:00 AM

Clear night

68° 💧 None 💨 11 mph H 47%29.94 inHg

2:00 AM

Clear night

66° 💧 None 💨 8 mph H 55%29.94 inHg

3:00 AM

Clear night

65° 💧 None 💨 10 mph H 59%29.94 inHg

4:00 AM

Clear night

65° 💧 None 💨 13 mph H 62%29.94 inHg

5:00 AM

Mostly cloudy night

64° 💧 None 💨 13 mph H 65%29.97 inHg

6:00 AM

Clear night

64° 💧 None 💨 14 mph H 67%29.97 inHg

7:00 AM

Sunny

63° 💧 None 💨 16 mph H 69%30.00 inHg

10:00 AM

Sunny

65° 💧 None 💨 17 mph H 69%30.03 inHg

1:00 PM

Sunny

71° 💧 None 💨 18 mph H 53%30.03 inHg

4:00 PM

Mostly sunny

73° 💧 None 💨 17 mph H 41%30.00 inHg

7:00 PM

Sunny

70° 💧 None 💨 10 mph H 49%30.00 inHg

10:00 PM

Clear night

64° 💧 None 💨 4 mph H 66%30.00 inHg

Thursday

1:00 AM

Mostly clear night

62° 💧 None 💨 4 mph H 72%30.03 inHg

4:00 AM

Clear night

62° 💧 None 💨 3 mph H 73%30.00 inHg

7:00 AM

Clear night

60° 💧 None 💨 6 mph H 78%29.97 inHg

10:00 AM

Mostly sunny

68° 💧 None 💨 10 mph H 62%29.94 inHg

1:00 PM

Sunny

77° 💧 None 💨 12 mph H 45%29.88 inHg

4:00 PM

Sunny

81° 💧 None 💨 14 mph H 35%29.80 inHg

7:00 PM

Sunny

75° 💧 None 💨 15 mph H 51%29.74 inHg

10:00 PM

Clear night

71° 💧 None 💨 12 mph H 62%29.74 inHg

Friday

1:00 AM

Mostly clear night

70° 💧 None 💨 14 mph H 64%29.68 inHg

4:00 AM

Clear night

69° 💧 None 💨 14 mph H 64%29.65 inHg

7:00 AM

Partly cloudy night

68° 💧 None 💨 14 mph H 65%29.59 inHg

10:00 AM

Partly cloudy

72° 💧 None 💨 15 mph H 61%29.53 inHg

1:00 PM

Partly cloudy

78° 💧 None 💨 13 mph H 55%29.47 inHg

4:00 PM

Partly cloudy

84° 💧 None 💨 9 mph H 47%29.47 inHg

7:00 PM

Sunny

81° 💧 None 💨 16 mph H 41%29.56 inHg

10:00 PM

Clear night

67° 💧 None 💨 23 mph H 68%29.77 inHg

Saturday

1:00 AM

Clear night

60° 💧 None 💨 16 mph H 64%29.85 inHg

4:00 AM

Clear night

57° 💧 None 💨 11 mph H 71%29.91 inHg

7:00 AM

Partly cloudy night

55° 💧 None 💨 7 mph H 78%29.97 inHg

1:00 PM

Overcast

65° 💧 None 💨 9 mph H 47%30.00 inHg

7:00 PM

Overcast

65° 💧 None 💨 2 mph H 49%30.00 inHg

Sunday

1:00 AM

Partly cloudy night

59° 💧 None 💨 4 mph H 64%30.09 inHg

7:00 AM

Overcast night

56° 💧 None 💨 11 mph H 72%30.12 inHg

1:00 PM

Overcast

63° 💧 None 💨 10 mph H 58%30.18 inHg

7:00 PM

Mostly cloudy

62° 💧 None 💨 12 mph H 54%30.12 inHg

Monday

1:00 AM

Partly cloudy night

56° 💧 None 💨 12 mph H 71%30.15 inHg

7:00 AM

Light rain

54° 💧 None 💨 15 mph H 90%30.00 inHg

1:00 PM

Light rain

57° 💧 None 💨 15 mph H 85%29.85 inHg

7:00 PM

Light rain

55° 💧 None 💨 14 mph H 92%29.83 inHg

Tuesday

1:00 AM

Mostly cloudy night

51° 💧 None 💨 14 mph H 93%29.97 inHg

7:00 AM

Mostly clear night

49° 💧 None 💨 7 mph H 96%30.09 inHg

1:00 PM

Sunny

62° 💧 None 💨 9 mph H 67%30.15 inHg

7:00 PM

Sunny

64° 💧 None 💨 6 mph H 69%30.12 inHg

Wednesday

1:00 AM

Clear night

57° 💧 None 💨 8 mph H 83%30.21 inHg

7:00 AM

Clear night

55° 💧 None 💨 8 mph H 91%30.24 inHg

1:00 PM

Mostly cloudy

68° 💧 None 💨 16 mph H 67%30.27 inHg

7:00 PM

Mostly sunny

66° 💧 None 💨 21 mph H 69%30.15 inHg

Thursday

1:00 AM

Partly cloudy night

59° 💧 None 💨 15 mph H 91%30.27 inHg

7:00 AM

Mostly cloudy night

59° 💧 None 💨 8 mph H 94%30.33 inHg

1:00 PM

Overcast

68° 💧 None 💨 12 mph H 74%30.42 inHg

7:00 PM

Sunny

65° 💧 None 💨 9 mph H 72%30.42 inHg

Friday

1:00 AM

Mostly clear night

59° 💧 None 💨 14 mph H 88%30.53 inHg

7:00 AM

Clear night

51° 💧 None 💨 15 mph H 88%30.65 inHg

1:00 PM

Mostly sunny

57° 💧 None 💨 12 mph H 63%30.68 inHg

7:00 PM

Sunny

56° 💧 None 💨 7 mph H 61%30.59 inHg

Saturday

1:00 AM

Clear night

48° 💧 None 💨 4 mph H 83%30.56 inHg

7:00 AM

Clear night

48° 💧 None 💨 6 mph H 88%30.53 inHg

1:00 PM

Sunny

59° 💧 None 💨 11 mph H 56%30.42 inHg

7:00 PM

Sunny

59° 💧 None 💨 10 mph H 58%30.24 inHg

Sunday

1:00 AM

Clear night

53° 💧 None 💨 14 mph H 78%30.24 inHg

7:00 AM

Clear night

52° 💧 None 💨 17 mph H 78%30.15 inHg

1:00 PM

Mostly cloudy

63° 💧 None 💨 20 mph H 60%30.03 inHg

7:00 PM

Mostly cloudy

62° 💧 None 💨 22 mph H 59%29.91 inHg

Monday

1:00 AM

Light rain

57° 💧 None 💨 20 mph H 78%29.91 inHg

7:00 AM

Partly cloudy night

57° 💧 None 💨 17 mph H 76%29.91 inHg

In Grenville and, more broadly, across the state of South Dakota: As the afternoon progresses into the evening, the sky remains mostly sunny with just a few clouds overhead. Temperatures are mild to warm, ranging from 74 to 81 degrees Fahrenheit. Winds from the southeast are moderate, averaging up to 14 mph, with occasional gusts reaching 28 mph. No rain is expected during this time, providing a calm and pleasant evening. Residents can enjoy comfortable conditions with gentle breezes and clear skies.

15-Day Weather Outlook for Grenville

TomorrowTomorrow

Light thunderstorms 79°/70° 💧 None 💨 22 mph

Tuesday, Sep 8Tue Sep 8

Partly cloudy 80°/69° 💧 None 💨 23 mph

Wednesday, Sep 9Wed Sep 9

Mostly cloudy 76°/63° 💧 0.465 in 💨 18 mph

Thursday, Sep 10Thu Sep 10

Mostly sunny 81°/60° 💧 None 💨 14 mph

Friday, Sep 11Fri Sep 11

Mostly sunny 84°/68° 💧 None 💨 15 mph

Saturday, Sep 12Sat Sep 12

Partly cloudy 81°/55° 💧 0.004 in 💨 23 mph

Sunday, Sep 13Sun Sep 13

Overcast 65°/56° 💧 None 💨 11 mph

Monday, Sep 14Mon Sep 14

Light rain 62°/54° 💧 0.928 in 💨 15 mph

Tuesday, Sep 15Tue Sep 15

Light rain 62°/49° 💧 0.201 in 💨 14 mph

Wednesday, Sep 16Wed Sep 16

Mostly cloudy 68°/55° 💧 None 💨 16 mph

Thursday, Sep 17Thu Sep 17

Overcast 68°/59° 💧 0.195 in 💨 21 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 65°/51° 💧 None 💨 15 mph

Saturday, Sep 19Sat Sep 19

Sunny 59°/48° 💧 None 💨 11 mph

Sunday, Sep 20Sun Sep 20

Mostly cloudy 63°/52° 💧 None 💨 20 mph

Monday, Sep 21Mon Sep 21

Light rain 62°/57° 💧 0.200 in 💨 22 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Grenville

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Grenville

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 5:00 PM

PM2.5 Fine particles Good 4,3µg/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 4,4µg/m³

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

O₃ Ozone Fair 77,4µg/m³

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

NO₂ Nitrogen dioxide Good 0,4µg/m³

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

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Grenville

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 7,0High 🙂Fair

Tomorrow UV 5,5Moderate 🙂Fair

Tuesday UV 5,9Moderate 🙂Fair

Wednesday UV 5,8Moderate 🙂Fair

Thursday UV 6,1High 🙂Fair

Friday UV 7,0High —Unavailable

Saturday UV 5,0Moderate —Unavailable

Hourly UV index today

5:00 PMUV 2,4 6:00 PMUV 1,0 7:00 PMUV 0,2

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.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

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 Grenville

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · GRENVILLE, SOUTH DAKOTA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 11:00 PM–12:00 AM.

96/100Best-hour score

BEST TIME TONIGHT 11:00 PM–12:00 AM Astronomical darkness: 9:42 PM–5:14 AM

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

☾ Moonlight 23% Waning Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 22° high at the best hour.

✦ Estimated visible meteors 0–2/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min45%

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.

DISCOVER WEATHER NEARBY Weather in other cities

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Forecast data for Grenville were last refreshed today at 4:33 PM. The current forecast period extends through 08/09/2026 at 2:00 PM. 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.