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Current weather in Alpena is clear sky.

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

Now · 12:42 PM

Alpena Weather & Hourly Forecast

United States · South Dakota · 57312

84°F

Sunny

Feels like: 86°F

💧 Humidity 66% 🌡 Pressure 29.91 inHg 💨 Wind 12 mph 👁 Visibility 26.1 mi ☁ Clouds 10% ☀️ UV index 4.8 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Alpena

Today

1:00 PM

Sunny

84° 💧 None 💨 12 mph H 66%29.91 inHg

4:00 PM

Sunny

89° 💧 None 💨 13 mph H 56%29.88 inHg

7:00 PM

Sunny

85° 💧 None 💨 13 mph H 63%29.85 inHg

10:00 PM

Clear night

80° 💧 None 💨 11 mph H 74%29.91 inHg

Tomorrow

1:00 AM

Clear night

77° 💧 None 💨 13 mph H 81%29.88 inHg

4:00 AM

Light rain

75° 💧 0.019 in 💨 14 mph H 89%29.88 inHg

7:00 AM

Light thunderstorms

74° 💧 0.029 in 💨 16 mph H 92%29.85 inHg

10:00 AM

Light thunderstorms

78° 💧 0.002 in 💨 18 mph H 82%29.85 inHg

1:00 PM

Mostly sunny

89° 💧 0.002 in 💨 22 mph H 56%29.74 inHg

4:00 PM

Mostly cloudy

92° 💧 0.176 in 💨 17 mph H 50%29.68 inHg

7:00 PM

Light thunderstorms

78° 💧 0.139 in 💨 15 mph H 86%29.74 inHg

10:00 PM

Thunderstorms

76° 💧 0.261 in 💨 8 mph H 89%29.77 inHg

Tuesday

1:00 AM

Partly cloudy night

76° 💧 None 💨 13 mph H 85%29.77 inHg

4:00 AM

Mostly cloudy night

77° 💧 None 💨 15 mph H 74%29.74 inHg

7:00 AM

Mostly cloudy night

76° 💧 0.003 in 💨 14 mph H 72%29.77 inHg

10:00 AM

Mostly sunny

80° 💧 None 💨 6 mph H 68%29.83 inHg

Today

1:00 PM

Sunny

84° 💧 None 💨 12 mph H 66%29.91 inHg

2:00 PM

Sunny

87° 💧 None 💨 13 mph H 62%29.88 inHg

3:00 PM

Sunny

88° 💧 None 💨 12 mph H 58%29.88 inHg

4:00 PM

Sunny

89° 💧 None 💨 13 mph H 56%29.88 inHg

5:00 PM

Sunny

89° 💧 None 💨 13 mph H 55%29.85 inHg

6:00 PM

Sunny

87° 💧 None 💨 14 mph H 58%29.85 inHg

7:00 PM

Sunny

85° 💧 None 💨 13 mph H 63%29.85 inHg

8:00 PM

Sunny

82° 💧 None 💨 12 mph H 68%29.85 inHg

9:00 PM

Clear night

81° 💧 None 💨 12 mph H 72%29.88 inHg

10:00 PM

Clear night

80° 💧 None 💨 11 mph H 74%29.91 inHg

11:00 PM

Clear night

78° 💧 None 💨 12 mph H 76%29.91 inHg

Tomorrow

12:00 AM

Clear night

77° 💧 None 💨 13 mph H 79%29.88 inHg

1:00 AM

Clear night

77° 💧 None 💨 13 mph H 81%29.88 inHg

2:00 AM

Overcast night

76° 💧 None 💨 12 mph H 84%29.88 inHg

3:00 AM

Overcast night

76° 💧 None 💨 14 mph H 86%29.88 inHg

4:00 AM

Light rain

75° 💧 0.014 in 💨 14 mph H 89%29.88 inHg

5:00 AM

Light rain

75° 💧 0.006 in 💨 16 mph H 91%29.85 inHg

6:00 AM

Mostly cloudy night

74° 💧 None 💨 15 mph H 91%29.85 inHg

7:00 AM

Light thunderstorms

74° 💧 0.005 in 💨 16 mph H 92%29.85 inHg

8:00 AM

Light thunderstorms

74° 💧 0.003 in 💨 17 mph H 90%29.85 inHg

9:00 AM

Light thunderstorms

75° 💧 0.021 in 💨 16 mph H 90%29.88 inHg

10:00 AM

Light thunderstorms

78° 💧 0.002 in 💨 18 mph H 82%29.85 inHg

11:00 AM

Overcast

82° 💧 None 💨 21 mph H 71%29.80 inHg

12:00 PM

Mostly cloudy

85° 💧 None 💨 22 mph H 62%29.77 inHg

1:00 PM

Mostly sunny

89° 💧 None 💨 22 mph H 56%29.74 inHg

2:00 PM

Partly cloudy

91° 💧 None 💨 21 mph H 51%29.71 inHg

3:00 PM

Mostly cloudy

92° 💧 0.002 in 💨 18 mph H 50%29.71 inHg

4:00 PM

Mostly cloudy

92° 💧 0.003 in 💨 17 mph H 50%29.68 inHg

5:00 PM

Thunderstorms

85° 💧 0.115 in 💨 13 mph H 69%29.71 inHg

6:00 PM

Light thunderstorms

79° 💧 0.058 in 💨 14 mph H 85%29.71 inHg

7:00 PM

Light thunderstorms

78° 💧 0.009 in 💨 15 mph H 86%29.74 inHg

8:00 PM

Light thunderstorms

76° 💧 0.013 in 💨 14 mph H 89%29.74 inHg

9:00 PM

Thunderstorms

75° 💧 0.118 in 💨 11 mph H 91%29.77 inHg

10:00 PM

Thunderstorms

76° 💧 0.177 in 💨 8 mph H 89%29.77 inHg

11:00 PM

Light thunderstorms

74° 💧 0.080 in 💨 8 mph H 93%29.80 inHg

Tuesday

12:00 AM

Light thunderstorms

75° 💧 0.004 in 💨 11 mph H 91%29.77 inHg

1:00 AM

Partly cloudy night

76° 💧 None 💨 13 mph H 85%29.77 inHg

2:00 AM

Mostly cloudy night

76° 💧 None 💨 15 mph H 81%29.77 inHg

3:00 AM

Mostly cloudy night

77° 💧 None 💨 16 mph H 77%29.74 inHg

4:00 AM

Mostly cloudy night

77° 💧 None 💨 15 mph H 74%29.74 inHg

5:00 AM

Mostly cloudy night

77° 💧 None 💨 15 mph H 72%29.77 inHg

6:00 AM

Mostly cloudy night

76° 💧 None 💨 14 mph H 72%29.77 inHg

7:00 AM

Mostly cloudy night

76° 💧 None 💨 14 mph H 72%29.77 inHg

8:00 AM

Mostly cloudy

76° 💧 0.003 in 💨 12 mph H 76%29.77 inHg

9:00 AM

Mostly sunny

78° 💧 None 💨 4 mph H 74%29.80 inHg

10:00 AM

Mostly sunny

80° 💧 None 💨 6 mph H 68%29.83 inHg

11:00 AM

Sunny

82° 💧 None 💨 8 mph H 66%29.83 inHg

12:00 PM

Partly cloudy

83° 💧 None 💨 10 mph H 64%29.85 inHg

1:00 PM

Partly cloudy

82° 💧 0.000 in 💨 14 mph H 68%29.85 inHg

2:00 PM

Sunny

82° 💧 None 💨 15 mph H 51%29.85 inHg

3:00 PM

Sunny

83° 💧 None 💨 14 mph H 36%29.85 inHg

4:00 PM

Sunny

83° 💧 None 💨 11 mph H 37%29.85 inHg

5:00 PM

Sunny

83° 💧 None 💨 8 mph H 39%29.85 inHg

6:00 PM

Sunny

82° 💧 None 💨 4 mph H 42%29.88 inHg

7:00 PM

Sunny

79° 💧 None 💨 2 mph H 57%29.88 inHg

Wednesday

4:00 AM

Clear night

65° 💧 None 💨 9 mph H 58%30.00 inHg

7:00 AM

Clear night

62° 💧 None 💨 7 mph H 54%30.06 inHg

10:00 AM

Sunny

68° 💧 None 💨 12 mph H 54%30.12 inHg

1:00 PM

Sunny

73° 💧 None 💨 12 mph H 52%30.12 inHg

4:00 PM

Sunny

77° 💧 None 💨 13 mph H 44%30.06 inHg

7:00 PM

Sunny

74° 💧 None 💨 8 mph H 43%30.03 inHg

10:00 PM

Clear night

65° 💧 None 💨 4 mph H 63%30.06 inHg

Thursday

1:00 AM

Clear night

60° 💧 None 💨 4 mph H 74%30.06 inHg

4:00 AM

Clear night

57° 💧 None 💨 2 mph H 79%30.06 inHg

7:00 AM

Clear night

56° 💧 None 💨 5 mph H 83%30.03 inHg

10:00 AM

Sunny

69° 💧 None 💨 9 mph H 63%30.00 inHg

1:00 PM

Sunny

83° 💧 None 💨 15 mph H 34%29.94 inHg

4:00 PM

Sunny

86° 💧 None 💨 14 mph H 30%29.83 inHg

7:00 PM

Sunny

82° 💧 None 💨 14 mph H 36%29.77 inHg

10:00 PM

Clear night

75° 💧 None 💨 16 mph H 50%29.74 inHg

Friday

1:00 AM

Clear night

72° 💧 None 💨 13 mph H 54%29.71 inHg

4:00 AM

Partly cloudy night

70° 💧 None 💨 12 mph H 59%29.68 inHg

7:00 AM

Mostly clear night

69° 💧 None 💨 13 mph H 60%29.62 inHg

10:00 AM

Partly cloudy

77° 💧 None 💨 16 mph H 48%29.56 inHg

1:00 PM

Mostly cloudy

86° 💧 None 💨 13 mph H 48%29.50 inHg

4:00 PM

Mostly sunny

91° 💧 None 💨 9 mph H 41%29.47 inHg

7:00 PM

Sunny

78° 💧 None 💨 27 mph H 46%29.59 inHg

10:00 PM

Clear night

70° 💧 None 💨 13 mph H 46%29.77 inHg

Saturday

1:00 AM

Clear night

62° 💧 None 💨 12 mph H 54%29.88 inHg

7:00 AM

Partly cloudy night

62° 💧 None 💨 5 mph H 73%29.85 inHg

1:00 PM

Sunny

56° 💧 None 💨 4 mph H 86%29.88 inHg

7:00 PM

Overcast

75° 💧 None 💨 8 mph H 40%29.85 inHg

Sunday

1:00 AM

Mostly cloudy night

74° 💧 None 💨 10 mph H 48%29.71 inHg

7:00 AM

Light thunderstorms

64° 💧 None 💨 15 mph H 86%29.68 inHg

1:00 PM

Overcast

60° 💧 None 💨 19 mph H 91%29.59 inHg

7:00 PM

Overcast

64° 💧 None 💨 13 mph H 83%29.68 inHg

Monday

1:00 AM

Overcast night

62° 💧 None 💨 16 mph H 80%29.83 inHg

7:00 AM

Mostly cloudy night

56° 💧 None 💨 16 mph H 82%30.00 inHg

1:00 PM

Overcast

53° 💧 None 💨 14 mph H 85%30.09 inHg

7:00 PM

Partly cloudy

62° 💧 None 💨 15 mph H 60%30.12 inHg

Tuesday

1:00 AM

Clear night

61° 💧 None 💨 9 mph H 58%30.09 inHg

7:00 AM

Clear night

51° 💧 None 💨 7 mph H 71%30.21 inHg

1:00 PM

Sunny

47° 💧 None 💨 6 mph H 79%30.27 inHg

7:00 PM

Sunny

62° 💧 None 💨 4 mph H 56%30.30 inHg

Wednesday

1:00 AM

Clear night

63° 💧 None 💨 3 mph H 64%30.21 inHg

7:00 AM

Mostly clear night

53° 💧 None 💨 7 mph H 77%30.27 inHg

1:00 PM

Sunny

53° 💧 None 💨 10 mph H 78%30.24 inHg

7:00 PM

Sunny

73° 💧 None 💨 15 mph H 53%30.12 inHg

Thursday

1:00 AM

Clear night

71° 💧 None 💨 15 mph H 47%30.00 inHg

7:00 AM

Partly cloudy night

63° 💧 None 💨 16 mph H 61%29.97 inHg

1:00 PM

Partly cloudy

60° 💧 None 💨 11 mph H 74%29.94 inHg

7:00 PM

Partly cloudy

70° 💧 None 💨 14 mph H 59%29.97 inHg

Friday

1:00 AM

Mostly clear night

64° 💧 None 💨 10 mph H 64%29.97 inHg

7:00 AM

Overcast night

54° 💧 None 💨 7 mph H 76%30.00 inHg

1:00 PM

Overcast

53° 💧 None 💨 3 mph H 67%30.03 inHg

7:00 PM

Sunny

62° 💧 None 💨 10 mph H 47%30.06 inHg

Saturday

1:00 AM

Clear night

61° 💧 None 💨 7 mph H 51%30.00 inHg

7:00 AM

Mostly clear night

49° 💧 None 💨 3 mph H 73%30.06 inHg

1:00 PM

Overcast

51° 💧 None 💨 3 mph H 69%30.12 inHg

7:00 PM

Sunny

57° 💧 None 💨 10 mph H 53%30.24 inHg

Sunday

1:00 AM

Clear night

57° 💧 None 💨 8 mph H 47%30.24 inHg

7:00 AM

Clear night

45° 💧 None 💨 5 mph H 73%30.33 inHg

1:00 PM

Sunny

39° 💧 None 💨 4 mph H 89%30.42 inHg

7:00 PM

Sunny

57° 💧 None 💨 2 mph H 44%30.42 inHg

Monday

1:00 AM

Clear night

57° 💧 None 💨 6 mph H 53%30.30 inHg

In Alpena and, more broadly, across the state of South Dakota: The rest of the day will be mostly sunny with a few clouds drifting through the sky. Temperatures will remain mild to warm, ranging from around 72 to 85 degrees Fahrenheit. There is a slight chance of light rain, with potential accumulation around 0.01 inches, and the highest probability of rain is about 33%. Winds will be noticeable, coming from the southeast at speeds up to 19 mph, with gusts reaching as high as 27 mph. Overall, it looks like a pleasant afternoon with comfortable temperatures and gentle breezes, though there could be brief, light showers in some areas. It’s a good idea to keep an umbrella handy just in case, especially during the more gusty moments.

15-Day Weather Outlook for Alpena

TomorrowTomorrow

Light thunderstorms 92°/74° 💧 None 💨 22 mph

Tuesday, Sep 8Tue Sep 8

Light thunderstorms 83°/74° 💧 None 💨 16 mph

Wednesday, Sep 9Wed Sep 9

Sunny 79°/62° 💧 0.435 in 💨 13 mph

Thursday, Sep 10Thu Sep 10

Sunny 86°/56° 💧 None 💨 15 mph

Friday, Sep 11Fri Sep 11

Partly cloudy 91°/69° 💧 None 💨 16 mph

Saturday, Sep 12Sat Sep 12

Partly cloudy 78°/56° 💧 1.080 in 💨 27 mph

Sunday, Sep 13Sun Sep 13

Light thunderstorms 75°/60° 💧 1.445 in 💨 19 mph

Monday, Sep 14Mon Sep 14

Overcast 64°/53° 💧 0.077 in 💨 16 mph

Tuesday, Sep 15Tue Sep 15

Partly cloudy 62°/47° 💧 None 💨 15 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 63°/53° 💧 None 💨 10 mph

Thursday, Sep 17Thu Sep 17

Partly cloudy 73°/60° 💧 None 💨 16 mph

Friday, Sep 18Fri Sep 18

Partly cloudy 70°/53° 💧 None 💨 14 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 62°/49° 💧 0.001 in 💨 10 mph

Sunday, Sep 20Sun Sep 20

Sunny 57°/39° 💧 None 💨 10 mph

Monday, Sep 21Mon Sep 21

Sunny 57°/57° 💧 None 💨 6 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Alpena

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Alpena

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 1:00 PM

PM2.5 Fine particles Good 2,3µg/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 2,3µg/m³

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

O₃ Ozone Good 59,0µg/m³

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

NO₂ Nitrogen dioxide Good 0,5µg/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 Alpena

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 5,9Moderate 😊Good

Tomorrow UV 6,8High 🙂Fair

Tuesday UV 6,7High 🙂Fair

Wednesday UV 6,2High 🙂Fair

Thursday UV 8,0Very high 😊Good

Friday UV 7,0High —Unavailable

Saturday UV 4,0Moderate —Unavailable

Hourly UV index today

1:00 PMUV 1,6 2:00 PMUV 5,2 3:00 PMUV 5,9 4:00 PMUV 4,4 5:00 PMUV 2,6 6:00 PMUV 1,1 7:00 PMUV 0,3

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

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

Good air quality

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

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure.

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 Alpena

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · ALPENA, SOUTH DAKOTA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 1:00 AM–2:00 AM.

100/100Best-hour score

BEST TIME TONIGHT 1:00 AM–2:00 AM Astronomical darkness: 9:42 PM–5:22 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 39° high at the best hour.

✦ Estimated visible meteors 1–3/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min66%

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 Alpena were last refreshed today at 12:42 PM. The current forecast period extends through 08/09/2026 at 10:00 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.