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Current weather in St. Onge is scattered clouds.

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

Now · 2:11 PM

St. Onge Weather & Hourly Forecast

United States · South Dakota · 57779

69°F

Partly cloudy

Feels like: 59°F

💧 Humidity 52% 🌡 Pressure 29.88 inHg 💨 Wind 18 mph 👁 Visibility 29.7 mi ☁ Clouds 45% ☀️ UV index 5.7 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for St. Onge

Today

3:00 PM

Partly cloudy

70° 💧 None 💨 18 mph H 50%29.83 inHg

6:00 PM

Mostly sunny

69° 💧 None 💨 17 mph H 55%29.80 inHg

9:00 PM

Partly cloudy night

63° 💧 0.066 in 💨 17 mph H 73%29.80 inHg

Tomorrow

12:00 AM

Light thunderstorms

61° 💧 0.052 in 💨 10 mph H 90%29.71 inHg

3:00 AM

Light rain

64° 💧 0.085 in 💨 12 mph H 86%29.59 inHg

6:00 AM

Clear night

65° 💧 None 💨 6 mph H 75%29.53 inHg

9:00 AM

Partly cloudy

64° 💧 0.001 in 💨 17 mph H 65%29.68 inHg

12:00 PM

Mostly sunny

65° 💧 None 💨 19 mph H 50%29.77 inHg

3:00 PM

Sunny

69° 💧 None 💨 17 mph H 34%29.74 inHg

6:00 PM

Sunny

66° 💧 None 💨 15 mph H 28%29.80 inHg

9:00 PM

Clear night

61° 💧 None 💨 16 mph H 31%29.91 inHg

Tuesday

12:00 AM

Clear night

55° 💧 None 💨 13 mph H 47%30.03 inHg

3:00 AM

Clear night

52° 💧 None 💨 11 mph H 58%30.09 inHg

6:00 AM

Clear night

50° 💧 None 💨 9 mph H 65%30.15 inHg

9:00 AM

Sunny

57° 💧 None 💨 8 mph H 54%30.18 inHg

12:00 PM

Mostly sunny

65° 💧 None 💨 4 mph H 42%30.15 inHg

Today

3:00 PM

Partly cloudy

70° 💧 None 💨 18 mph H 50%29.83 inHg

4:00 PM

Partly cloudy

72° 💧 None 💨 18 mph H 49%29.83 inHg

5:00 PM

Partly cloudy

71° 💧 None 💨 18 mph H 51%29.80 inHg

6:00 PM

Mostly sunny

69° 💧 None 💨 17 mph H 55%29.80 inHg

7:00 PM

Mostly sunny

66° 💧 None 💨 15 mph H 61%29.80 inHg

8:00 PM

Clear night

64° 💧 None 💨 16 mph H 67%29.80 inHg

9:00 PM

Partly cloudy night

63° 💧 None 💨 17 mph H 73%29.80 inHg

10:00 PM

Light thunderstorms

61° 💧 0.011 in 💨 17 mph H 84%29.77 inHg

11:00 PM

Light thunderstorms

60° 💧 0.056 in 💨 15 mph H 92%29.74 inHg

Tomorrow

12:00 AM

Light thunderstorms

61° 💧 0.041 in 💨 10 mph H 90%29.71 inHg

1:00 AM

Overcast night

60° 💧 None 💨 7 mph H 88%29.68 inHg

2:00 AM

Light rain

63° 💧 0.011 in 💨 7 mph H 85%29.62 inHg

3:00 AM

Light rain

64° 💧 0.085 in 💨 12 mph H 86%29.59 inHg

4:00 AM

Mostly cloudy night

66° 💧 None 💨 9 mph H 80%29.56 inHg

5:00 AM

Mostly clear night

66° 💧 None 💨 9 mph H 75%29.53 inHg

6:00 AM

Clear night

65° 💧 None 💨 6 mph H 75%29.53 inHg

7:00 AM

Fog

60° 💧 None 💨 7 mph H 92%29.62 inHg

8:00 AM

Fog

63° 💧 None 💨 9 mph H 86%29.62 inHg

9:00 AM

Partly cloudy

64° 💧 0.001 in 💨 17 mph H 65%29.68 inHg

10:00 AM

Sunny

65° 💧 None 💨 17 mph H 54%29.71 inHg

11:00 AM

Sunny

65° 💧 None 💨 19 mph H 50%29.74 inHg

12:00 PM

Mostly sunny

65° 💧 None 💨 19 mph H 50%29.77 inHg

1:00 PM

Partly cloudy

66° 💧 None 💨 17 mph H 42%29.77 inHg

2:00 PM

Sunny

68° 💧 None 💨 18 mph H 36%29.74 inHg

3:00 PM

Sunny

69° 💧 None 💨 17 mph H 34%29.74 inHg

4:00 PM

Sunny

69° 💧 None 💨 16 mph H 29%29.74 inHg

5:00 PM

Sunny

68° 💧 None 💨 17 mph H 28%29.77 inHg

6:00 PM

Sunny

66° 💧 None 💨 15 mph H 28%29.80 inHg

7:00 PM

Sunny

64° 💧 None 💨 14 mph H 28%29.83 inHg

8:00 PM

Clear night

62° 💧 None 💨 15 mph H 29%29.85 inHg

9:00 PM

Clear night

61° 💧 None 💨 16 mph H 31%29.91 inHg

10:00 PM

Clear night

59° 💧 None 💨 15 mph H 34%29.94 inHg

11:00 PM

Clear night

57° 💧 None 💨 14 mph H 41%30.00 inHg

Tuesday

12:00 AM

Clear night

55° 💧 None 💨 13 mph H 47%30.03 inHg

1:00 AM

Clear night

54° 💧 None 💨 13 mph H 51%30.06 inHg

2:00 AM

Clear night

53° 💧 None 💨 12 mph H 55%30.06 inHg

3:00 AM

Clear night

52° 💧 None 💨 11 mph H 58%30.09 inHg

4:00 AM

Clear night

51° 💧 None 💨 10 mph H 61%30.09 inHg

5:00 AM

Clear night

51° 💧 None 💨 9 mph H 63%30.12 inHg

6:00 AM

Clear night

50° 💧 None 💨 9 mph H 65%30.15 inHg

7:00 AM

Sunny

50° 💧 None 💨 8 mph H 66%30.15 inHg

8:00 AM

Sunny

54° 💧 None 💨 7 mph H 61%30.18 inHg

9:00 AM

Sunny

57° 💧 None 💨 8 mph H 54%30.18 inHg

10:00 AM

Sunny

60° 💧 None 💨 7 mph H 49%30.18 inHg

11:00 AM

Sunny

63° 💧 None 💨 5 mph H 45%30.18 inHg

12:00 PM

Mostly sunny

65° 💧 None 💨 4 mph H 42%30.15 inHg

1:00 PM

Partly cloudy

66° 💧 None 💨 6 mph H 40%30.15 inHg

2:00 PM

Mostly cloudy

66° 💧 None 💨 8 mph H 40%30.12 inHg

3:00 PM

Mostly cloudy

68° 💧 None 💨 8 mph H 40%30.09 inHg

4:00 PM

Partly cloudy

68° 💧 None 💨 10 mph H 38%30.06 inHg

5:00 PM

Mostly sunny

67° 💧 None 💨 13 mph H 38%30.06 inHg

6:00 PM

Mostly sunny

66° 💧 None 💨 14 mph H 40%30.03 inHg

7:00 PM

Sunny

63° 💧 None 💨 14 mph H 45%30.03 inHg

8:00 PM

Partly cloudy night

61° 💧 None 💨 12 mph H 50%30.06 inHg

9:00 PM

Mostly cloudy night

60° 💧 None 💨 12 mph H 54%30.09 inHg

10:00 PM

Overcast night

59° 💧 None 💨 14 mph H 55%30.09 inHg

11:00 PM

Partly cloudy night

59° 💧 None 💨 14 mph H 55%30.06 inHg

Wednesday

12:00 AM

Mostly clear night

59° 💧 None 💨 12 mph H 56%30.00 inHg

1:00 AM

Overcast night

60° 💧 None 💨 10 mph H 52%29.97 inHg

2:00 AM

Overcast night

60° 💧 None 💨 9 mph H 52%29.94 inHg

3:00 AM

Light thunderstorms

58° 💧 0.022 in 💨 9 mph H 67%29.94 inHg

4:00 AM

Light rain

58° 💧 0.007 in 💨 13 mph H 70%29.94 inHg

5:00 AM

Mostly cloudy night

60° 💧 None 💨 12 mph H 60%29.91 inHg

6:00 AM

Mostly cloudy night

62° 💧 None 💨 8 mph H 56%29.91 inHg

9:00 AM

Overcast

64° 💧 None 💨 2 mph H 60%29.97 inHg

12:00 PM

Sunny

73° 💧 None 💨 5 mph H 45%30.00 inHg

3:00 PM

Sunny

79° 💧 None 💨 8 mph H 33%30.00 inHg

6:00 PM

Sunny

71° 💧 None 💨 9 mph H 39%30.09 inHg

9:00 PM

Clear night

61° 💧 None 💨 4 mph H 59%30.18 inHg

Thursday

12:00 AM

Clear night

58° 💧 None 💨 1 mph H 67%30.24 inHg

3:00 AM

Clear night

54° 💧 None 💨 0 mph H 79%30.24 inHg

6:00 AM

Partly cloudy night

51° 💧 None 💨 3 mph H 88%30.24 inHg

9:00 AM

Light rain

61° 💧 None 💨 7 mph H 76%30.21 inHg

12:00 PM

Overcast

71° 💧 None 💨 12 mph H 64%30.12 inHg

3:00 PM

Overcast

78° 💧 None 💨 10 mph H 52%30.00 inHg

6:00 PM

Overcast

73° 💧 None 💨 9 mph H 64%30.00 inHg

9:00 PM

Overcast night

67° 💧 None 💨 9 mph H 82%30.03 inHg

Friday

12:00 AM

Partly cloudy night

64° 💧 None 💨 3 mph H 83%30.00 inHg

3:00 AM

Mostly clear night

61° 💧 None 💨 4 mph H 84%29.97 inHg

6:00 AM

Mostly clear night

61° 💧 None 💨 2 mph H 82%29.97 inHg

9:00 AM

Mostly sunny

66° 💧 None 💨 1 mph H 75%30.03 inHg

12:00 PM

Mostly sunny

73° 💧 None 💨 5 mph H 63%30.00 inHg

3:00 PM

Partly cloudy

74° 💧 None 💨 8 mph H 62%29.97 inHg

6:00 PM

Partly cloudy

72° 💧 None 💨 8 mph H 65%29.97 inHg

9:00 PM

Partly cloudy night

66° 💧 None 💨 8 mph H 81%30.03 inHg

Saturday

12:00 AM

Mostly cloudy night

63° 💧 None 💨 8 mph H 88%29.97 inHg

3:00 AM

Partly cloudy night

61° 💧 None 💨 5 mph H 92%29.97 inHg

6:00 AM

Partly cloudy night

58° 💧 None 💨 2 mph H 93%29.97 inHg

12:00 PM

Light rain

74° 💧 None 💨 7 mph H 58%29.88 inHg

6:00 PM

Mostly sunny

69° 💧 None 💨 10 mph H 68%29.80 inHg

Sunday

12:00 AM

Mostly clear night

59° 💧 None 💨 6 mph H 92%29.83 inHg

6:00 AM

Mostly cloudy night

56° 💧 None 💨 7 mph H 98%29.85 inHg

12:00 PM

Mostly sunny

65° 💧 None 💨 15 mph H 58%29.91 inHg

6:00 PM

Mostly sunny

65° 💧 None 💨 14 mph H 57%29.97 inHg

Monday

12:00 AM

Mostly clear night

56° 💧 None 💨 9 mph H 80%30.15 inHg

6:00 AM

Clear night

51° 💧 None 💨 8 mph H 85%30.21 inHg

12:00 PM

Sunny

63° 💧 None 💨 4 mph H 52%30.24 inHg

6:00 PM

Sunny

64° 💧 None 💨 6 mph H 45%30.15 inHg

Tuesday

12:00 AM

Mostly clear night

54° 💧 None 💨 8 mph H 70%30.21 inHg

6:00 AM

Overcast night

48° 💧 None 💨 3 mph H 77%30.12 inHg

12:00 PM

Light rain

65° 💧 None 💨 10 mph H 60%30.06 inHg

6:00 PM

Mostly sunny

67° 💧 None 💨 13 mph H 56%29.91 inHg

Wednesday

12:00 AM

Clear night

64° 💧 None 💨 15 mph H 60%29.88 inHg

6:00 AM

Clear night

58° 💧 None 💨 3 mph H 51%29.88 inHg

12:00 PM

Mostly sunny

78° 💧 None 💨 5 mph H 36%29.91 inHg

6:00 PM

Sunny

77° 💧 None 💨 1 mph H 51%29.80 inHg

Thursday

12:00 AM

Partly cloudy night

71° 💧 None 💨 16 mph H 56%29.88 inHg

6:00 AM

Partly cloudy night

65° 💧 None 💨 6 mph H 65%29.88 inHg

12:00 PM

Mostly cloudy

82° 💧 None 💨 5 mph H 44%29.85 inHg

6:00 PM

Mostly cloudy

76° 💧 None 💨 7 mph H 46%29.83 inHg

Friday

12:00 AM

Overcast night

68° 💧 None 💨 4 mph H 57%29.88 inHg

6:00 AM

Partly cloudy night

63° 💧 None 💨 2 mph H 77%29.91 inHg

12:00 PM

Partly cloudy

72° 💧 None 💨 4 mph H 59%30.00 inHg

6:00 PM

Mostly sunny

69° 💧 None 💨 4 mph H 66%30.03 inHg

Saturday

12:00 AM

Clear night

55° 💧 None 💨 4 mph H 89%30.09 inHg

6:00 AM

Clear night

50° 💧 None 💨 2 mph H 65%30.09 inHg

12:00 PM

Mostly sunny

75° 💧 None 💨 4 mph H 36%30.12 inHg

6:00 PM

Sunny

70° 💧 None 💨 7 mph H 42%30.12 inHg

Sunday

12:00 AM

Mostly clear night

57° 💧 None 💨 8 mph H 48%30.21 inHg

6:00 AM

Clear night

52° 💧 None 💨 9 mph H 70%30.27 inHg

12:00 PM

Sunny

64° 💧 None 💨 11 mph H 50%30.27 inHg

6:00 PM

Overcast

63° 💧 None 💨 8 mph H 51%30.18 inHg

Monday

12:00 AM

Clear night

52° 💧 None 💨 0 mph H 76%30.24 inHg

6:00 AM

Clear night

47° 💧 None 💨 3 mph H 88%30.27 inHg

In St. Onge and, more broadly, across the state of South Dakota: The late afternoon will continue with mostly sunny skies and a few clouds. Temperatures are expected to remain mild, ranging from 61 to 68 degrees Fahrenheit. Winds will come from the southeast at a steady 8 to 16 mph, with gusts reaching up to 32 mph. As evening approaches, conditions are expected to remain dry with no precipitation forecasted. The wind may pick up slightly during the evening, but overall, it will be a calm and pleasant night. Temperatures will gradually decrease but stay within the mild range, making for comfortable conditions as night falls. There are no weather advisories at this time.

15-Day Weather Outlook for St. Onge

TomorrowTomorrow

Light thunderstorms 69°/60° 💧 None 💨 19 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 68°/50° 💧 None 💨 16 mph

Wednesday, Sep 16Wed Sep 16

Light thunderstorms 79°/58° 💧 0.171 in 💨 14 mph

Thursday, Sep 17Thu Sep 17

Light rain 78°/51° 💧 0.034 in 💨 12 mph

Friday, Sep 18Fri Sep 18

Partly cloudy 74°/61° 💧 0.001 in 💨 9 mph

Saturday, Sep 19Sat Sep 19

Light rain 74°/58° 💧 0.014 in 💨 8 mph

Sunday, Sep 20Sun Sep 20

Mostly sunny 69°/56° 💧 0.199 in 💨 15 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 65°/51° 💧 0.059 in 💨 14 mph

Tuesday, Sep 22Tue Sep 22

Mostly sunny 65°/48° 💧 0.003 in 💨 10 mph

Wednesday, Sep 23Wed Sep 23

Mostly sunny 78°/58° 💧 0.023 in 💨 15 mph

Thursday, Sep 24Thu Sep 24

Mostly cloudy 82°/65° 💧 0.001 in 💨 16 mph

Friday, Sep 25Fri Sep 25

Partly cloudy 76°/63° 💧 0.130 in 💨 7 mph

Saturday, Sep 26Sat Sep 26

Mostly sunny 75°/50° 💧 0.067 in 💨 4 mph

Sunday, Sep 27Sun Sep 27

Mostly sunny 70°/52° 💧 None 💨 11 mph

Monday, Sep 28Mon Sep 28

Overcast 63°/47° 💧 None 💨 8 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in St. Onge

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for St. Onge

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 3:00 PM

PM2.5 Fine particles Good 0,8µg/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 1,2µg/m³

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

O₃ Ozone Fair 71,9µg/m³

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

NO₂ Nitrogen dioxide Good 0,3µg/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 St. Onge

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 6,3High 🙂Fair

Tomorrow UV 5,8Moderate 😐Moderate

Tuesday UV 5,5Moderate 🙂Fair

Wednesday UV 5,5Moderate 🙂Fair

Thursday UV 8,0Very high 🙂Fair

Friday UV 6,0High —Unavailable

Saturday UV 6,0High —Unavailable

Hourly UV index today

3:00 PMUV 4,1 4:00 PMUV 2,5 5:00 PMUV 1,2 6:00 PMUV 0,3 7:00 PMUV 0,0

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 St. Onge

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · ST. ONGE, SOUTH DAKOTA

Tonight's Stargazing & Shooting Stars

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

77/100Best-hour score

BEST TIME TONIGHT 5:00 AM–6:00 AM Astronomical darkness: 8:49 PM–4:53 AM

☁ Cloud cover 32% Real hourly forecast for the best viewing hour.

☾ Moonlight 7% Waxing Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 83° 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 min72%

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 St. Onge were last refreshed today at 2:11 PM. The current forecast period extends through 15/09/2026 at 12:00 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.