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Current weather in Harper is overcast clouds.

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

Now · 9:46 PM

Harper Weather & Hourly Forecast

United States · Iowa · 52231

69°F

Overcast night

Feels like: 68°F

💧 Humidity 73% 🌡 Pressure 29.83 inHg 💨 Wind 8 mph 👁 Visibility 20.3 mi ☁ Clouds 100% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Harper

Today

10:00 PM

Overcast night

69° 💧 None 💨 8 mph H 73%29.83 inHg

Tomorrow

1:00 AM

Mostly cloudy night

68° 💧 None 💨 7 mph H 87%29.83 inHg

4:00 AM

Partly cloudy night

67° 💧 None 💨 7 mph H 94%29.80 inHg

7:00 AM

Mostly sunny

67° 💧 0.001 in 💨 6 mph H 95%29.83 inHg

10:00 AM

Overcast

75° 💧 0.002 in 💨 12 mph H 75%29.85 inHg

1:00 PM

Overcast

75° 💧 None 💨 11 mph H 72%29.91 inHg

4:00 PM

Sunny

78° 💧 None 💨 9 mph H 61%29.91 inHg

7:00 PM

Sunny

72° 💧 None 💨 5 mph H 67%29.94 inHg

10:00 PM

Clear night

67° 💧 None 💨 7 mph H 75%29.97 inHg

Sunday

1:00 AM

Mostly cloudy night

63° 💧 None 💨 5 mph H 77%30.03 inHg

4:00 AM

Mostly cloudy night

61° 💧 0.002 in 💨 5 mph H 80%30.03 inHg

7:00 AM

Mostly sunny

59° 💧 None 💨 5 mph H 87%30.03 inHg

10:00 AM

Overcast

66° 💧 0.031 in 💨 5 mph H 69%30.09 inHg

1:00 PM

Light thunderstorms

64° 💧 0.244 in 💨 9 mph H 85%30.09 inHg

4:00 PM

Light rain

62° 💧 0.076 in 💨 9 mph H 83%30.09 inHg

7:00 PM

Light rain

60° 💧 0.012 in 💨 8 mph H 91%30.09 inHg

Today

10:00 PM

Overcast night

69° 💧 None 💨 8 mph H 73%29.83 inHg

11:00 PM

Mostly cloudy night

70° 💧 None 💨 9 mph H 75%29.83 inHg

Tomorrow

12:00 AM

Mostly cloudy night

69° 💧 None 💨 8 mph H 82%29.83 inHg

1:00 AM

Mostly cloudy night

68° 💧 None 💨 7 mph H 87%29.83 inHg

2:00 AM

Clear night

68° 💧 None 💨 8 mph H 91%29.83 inHg

3:00 AM

Clear night

67° 💧 None 💨 7 mph H 93%29.83 inHg

4:00 AM

Partly cloudy night

67° 💧 None 💨 7 mph H 94%29.80 inHg

5:00 AM

Strong thunderstorm

67° 💧 None 💨 7 mph H 95%29.83 inHg

6:00 AM

Partly cloudy night

67° 💧 None 💨 3 mph H 95%29.83 inHg

7:00 AM

Mostly sunny

67° 💧 0.001 in 💨 6 mph H 95%29.83 inHg

8:00 AM

Mostly cloudy

69° 💧 None 💨 9 mph H 92%29.83 inHg

9:00 AM

Sunny

72° 💧 None 💨 9 mph H 84%29.83 inHg

10:00 AM

Overcast

75° 💧 None 💨 12 mph H 75%29.85 inHg

11:00 AM

Overcast

76° 💧 0.001 in 💨 13 mph H 73%29.88 inHg

12:00 PM

Overcast

75° 💧 0.001 in 💨 13 mph H 75%29.91 inHg

1:00 PM

Overcast

75° 💧 None 💨 11 mph H 72%29.91 inHg

2:00 PM

Mostly sunny

78° 💧 None 💨 9 mph H 65%29.91 inHg

3:00 PM

Sunny

78° 💧 None 💨 9 mph H 64%29.91 inHg

4:00 PM

Sunny

78° 💧 None 💨 9 mph H 61%29.91 inHg

5:00 PM

Sunny

77° 💧 None 💨 9 mph H 58%29.91 inHg

6:00 PM

Sunny

76° 💧 None 💨 8 mph H 58%29.94 inHg

7:00 PM

Sunny

72° 💧 None 💨 5 mph H 67%29.94 inHg

8:00 PM

Clear night

69° 💧 None 💨 5 mph H 74%29.97 inHg

9:00 PM

Clear night

68° 💧 None 💨 6 mph H 76%29.94 inHg

10:00 PM

Clear night

67° 💧 None 💨 7 mph H 75%29.97 inHg

11:00 PM

Clear night

65° 💧 None 💨 4 mph H 75%30.00 inHg

Sunday

12:00 AM

Partly cloudy night

63° 💧 None 💨 5 mph H 77%30.00 inHg

1:00 AM

Mostly cloudy night

63° 💧 None 💨 5 mph H 77%30.03 inHg

2:00 AM

Mostly cloudy night

62° 💧 None 💨 5 mph H 80%30.03 inHg

3:00 AM

Overcast night

61° 💧 None 💨 4 mph H 80%30.03 inHg

4:00 AM

Mostly cloudy night

61° 💧 0.001 in 💨 5 mph H 80%30.03 inHg

5:00 AM

Partly cloudy night

60° 💧 0.001 in 💨 6 mph H 82%30.03 inHg

6:00 AM

Partly cloudy night

59° 💧 0.000 in 💨 5 mph H 85%30.03 inHg

7:00 AM

Mostly sunny

59° 💧 None 💨 5 mph H 87%30.03 inHg

8:00 AM

Mostly cloudy

61° 💧 None 💨 5 mph H 83%30.06 inHg

9:00 AM

Overcast

64° 💧 None 💨 5 mph H 73%30.09 inHg

10:00 AM

Overcast

66° 💧 None 💨 5 mph H 69%30.09 inHg

11:00 AM

Overcast

66° 💧 0.000 in 💨 7 mph H 69%30.09 inHg

12:00 PM

Light rain

66° 💧 0.031 in 💨 8 mph H 73%30.12 inHg

1:00 PM

Light thunderstorms

64° 💧 0.050 in 💨 9 mph H 85%30.09 inHg

2:00 PM

Light rain

63° 💧 0.068 in 💨 9 mph H 86%30.12 inHg

3:00 PM

Moderate rain

61° 💧 0.126 in 💨 9 mph H 88%30.12 inHg

4:00 PM

Light rain

62° 💧 0.020 in 💨 9 mph H 83%30.09 inHg

5:00 PM

Light rain

61° 💧 0.034 in 💨 8 mph H 84%30.09 inHg

6:00 PM

Light rain

60° 💧 0.021 in 💨 8 mph H 89%30.09 inHg

7:00 PM

Light rain

60° 💧 0.011 in 💨 8 mph H 91%30.09 inHg

8:00 PM

Overcast night

60° 💧 0.000 in 💨 7 mph H 90%30.12 inHg

9:00 PM

Mostly cloudy night

60° 💧 None 💨 7 mph H 89%30.12 inHg

10:00 PM

Mostly cloudy night

59° 💧 None 💨 7 mph H 91%30.12 inHg

11:00 PM

Mostly cloudy night

59° 💧 None 💨 7 mph H 93%30.15 inHg

Monday

12:00 AM

Overcast night

59° 💧 None 💨 9 mph H 92%30.15 inHg

1:00 AM

Overcast night

59° 💧 None 💨 10 mph H 85%30.12 inHg

2:00 AM

Overcast night

60° 💧 None 💨 9 mph H 78%30.12 inHg

3:00 AM

Light rain

60° 💧 0.004 in 💨 10 mph H 78%30.15 inHg

4:00 AM

Thunderstorms

59° 💧 0.116 in 💨 9 mph H 88%30.15 inHg

5:00 AM

Severe thunderstorms

58° 💧 0.308 in 💨 10 mph H 91%30.15 inHg

6:00 AM

Light rain

58° 💧 0.078 in 💨 11 mph H 91%30.15 inHg

7:00 AM

Light rain

58° 💧 0.013 in 💨 12 mph H 91%30.15 inHg

4:00 PM

Mostly sunny

74° 💧 None 💨 16 mph H 64%29.97 inHg

7:00 PM

Mostly sunny

72° 💧 None 💨 13 mph H 71%29.91 inHg

10:00 PM

Partly cloudy night

71° 💧 None 💨 13 mph H 78%29.91 inHg

Tuesday

1:00 AM

Mostly cloudy night

73° 💧 None 💨 13 mph H 83%29.88 inHg

4:00 AM

Partly cloudy night

76° 💧 None 💨 10 mph H 76%29.85 inHg

7:00 AM

Moderate rain

69° 💧 None 💨 5 mph H 97%30.00 inHg

10:00 AM

Light rain

73° 💧 None 💨 7 mph H 92%30.00 inHg

1:00 PM

Light rain

75° 💧 None 💨 5 mph H 88%30.03 inHg

4:00 PM

Light rain

74° 💧 None 💨 5 mph H 95%30.06 inHg

7:00 PM

Light rain

71° 💧 None 💨 7 mph H 88%30.09 inHg

10:00 PM

Overcast night

68° 💧 None 💨 6 mph H 93%30.15 inHg

Wednesday

1:00 AM

Overcast night

65° 💧 None 💨 8 mph H 87%30.18 inHg

4:00 AM

Overcast night

63° 💧 None 💨 9 mph H 91%30.21 inHg

7:00 AM

Heavy rain

61° 💧 None 💨 8 mph H 94%30.24 inHg

10:00 AM

Light thunderstorms

62° 💧 None 💨 7 mph H 94%30.27 inHg

1:00 PM

Moderate rain

63° 💧 None 💨 7 mph H 96%30.24 inHg

4:00 PM

Light rain

66° 💧 None 💨 7 mph H 94%30.21 inHg

7:00 PM

Light rain

66° 💧 None 💨 5 mph H 98%30.18 inHg

10:00 PM

Moderate rain

66° 💧 None 💨 6 mph H 98%30.21 inHg

Thursday

1:00 AM

Light rain

67° 💧 None 💨 6 mph H 99%30.18 inHg

4:00 AM

Light rain

66° 💧 None 💨 8 mph H 99%30.18 inHg

7:00 AM

Moderate rain

66° 💧 None 💨 6 mph H 99%30.18 inHg

10:00 AM

Light rain

69° 💧 None 💨 5 mph H 96%30.18 inHg

1:00 PM

Overcast

78° 💧 None 💨 4 mph H 81%30.15 inHg

7:00 PM

Mostly cloudy

73° 💧 None 💨 9 mph H 63%30.33 inHg

Friday

1:00 AM

Mostly clear night

70° 💧 None 💨 5 mph H 77%30.24 inHg

7:00 AM

Overcast

66° 💧 None 💨 8 mph H 85%30.24 inHg

1:00 PM

Overcast

64° 💧 None 💨 8 mph H 88%30.18 inHg

7:00 PM

Overcast

77° 💧 None 💨 11 mph H 78%30.06 inHg

Saturday

1:00 AM

Mostly clear night

76° 💧 None 💨 11 mph H 90%29.94 inHg

7:00 AM

Overcast

75° 💧 None 💨 15 mph H 88%29.85 inHg

1:00 PM

Overcast

71° 💧 None 💨 9 mph H 95%29.80 inHg

7:00 PM

Overcast

82° 💧 None 💨 8 mph H 73%29.80 inHg

Sunday

1:00 AM

Clear night

72° 💧 None 💨 9 mph H 78%29.83 inHg

7:00 AM

Mostly cloudy

67° 💧 None 💨 7 mph H 87%29.88 inHg

1:00 PM

Moderate rain

63° 💧 None 💨 9 mph H 94%29.85 inHg

7:00 PM

Overcast

77° 💧 None 💨 13 mph H 73%29.77 inHg

Monday

1:00 AM

Moderate rain

75° 💧 None 💨 8 mph H 86%29.68 inHg

7:00 AM

Partly cloudy

68° 💧 None 💨 8 mph H 92%29.71 inHg

1:00 PM

Overcast

66° 💧 None 💨 8 mph H 85%29.74 inHg

7:00 PM

Overcast

71° 💧 None 💨 12 mph H 60%29.77 inHg

Tuesday

1:00 AM

Partly cloudy night

66° 💧 None 💨 7 mph H 65%29.77 inHg

7:00 AM

Sunny

59° 💧 None 💨 11 mph H 71%29.80 inHg

1:00 PM

Overcast

57° 💧 None 💨 12 mph H 69%29.80 inHg

7:00 PM

Overcast

61° 💧 None 💨 13 mph H 64%29.88 inHg

Wednesday

1:00 AM

Mostly clear night

59° 💧 None 💨 8 mph H 73%29.94 inHg

7:00 AM

Sunny

56° 💧 None 💨 7 mph H 82%30.00 inHg

1:00 PM

Mostly sunny

57° 💧 None 💨 9 mph H 81%30.06 inHg

7:00 PM

Overcast

65° 💧 None 💨 9 mph H 58%30.12 inHg

Thursday

1:00 AM

Overcast night

62° 💧 None 💨 7 mph H 65%30.12 inHg

7:00 AM

Overcast

58° 💧 None 💨 5 mph H 74%30.21 inHg

1:00 PM

Mostly cloudy

54° 💧 None 💨 7 mph H 84%30.24 inHg

7:00 PM

Overcast

62° 💧 None 💨 9 mph H 63%30.27 inHg

Friday

1:00 AM

Overcast night

60° 💧 None 💨 5 mph H 65%30.27 inHg

7:00 AM

Partly cloudy

55° 💧 None 💨 4 mph H 79%30.30 inHg

1:00 PM

Sunny

50° 💧 None 💨 6 mph H 87%30.33 inHg

7:00 PM

Sunny

64° 💧 None 💨 6 mph H 53%30.33 inHg

Saturday

1:00 AM

Clear night

59° 💧 None 💨 4 mph H 72%30.27 inHg

7:00 AM

Sunny

50° 💧 None 💨 4 mph H 85%30.27 inHg

1:00 PM

Sunny

46° 💧 None 💨 4 mph H 93%30.30 inHg

In Harper and, more broadly, across the state of Iowa: As evening settles in, expect mostly cloudy skies with temperatures remaining mild to warm, ranging from 77 to 80 degrees Fahrenheit. Winds will be coming from the southeast at around 12 mph, with gusts reaching up to 29 mph. No precipitation is anticipated during the evening hours, so outdoor plans should be comfortable. The moderate southeast winds may cause some breezy conditions, especially with the gusts. Temperatures will stay steady through the night, making for a warm and relatively calm evening. Be prepared for the gusty winds if you’re heading outdoors, and enjoy the mild weather as the night progresses.

15-Day Weather Outlook for Harper

Sunday, Sep 13Sun Sep 13

Light thunderstorms 72°/59° 💧 None 💨 9 mph

Monday, Sep 14Mon Sep 14

Thunderstorms 74°/58° 💧 0.752 in 💨 16 mph

Tuesday, Sep 15Tue Sep 15

Moderate rain 76°/69° 💧 0.404 in 💨 13 mph

Wednesday, Sep 16Wed Sep 16

Light thunderstorms 71°/61° 💧 1.289 in 💨 9 mph

Thursday, Sep 17Thu Sep 17

Moderate rain 78°/66° 💧 0.384 in 💨 8 mph

Friday, Sep 18Fri Sep 18

Overcast 73°/64° 💧 0.014 in 💨 9 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 77°/71° 💧 0.235 in 💨 15 mph

Sunday, Sep 20Sun Sep 20

Moderate rain 82°/63° 💧 0.044 in 💨 9 mph

Monday, Sep 21Mon Sep 21

Moderate rain 77°/66° 💧 0.174 in 💨 13 mph

Tuesday, Sep 22Tue Sep 22

Overcast 71°/57° 💧 None 💨 12 mph

Wednesday, Sep 23Wed Sep 23

Overcast 61°/56° 💧 0.004 in 💨 13 mph

Thursday, Sep 24Thu Sep 24

Overcast 65°/54° 💧 None 💨 9 mph

Friday, Sep 25Fri Sep 25

Overcast 62°/50° 💧 0.003 in 💨 9 mph

Saturday, Sep 26Sat Sep 26

Sunny 64°/46° 💧 0.001 in 💨 6 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Harper

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Harper

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 10:00 PM

PM2.5 Fine particles Good 4,7µg/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 4,9µg/m³

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

O₃ Ozone Good 54,8µg/m³

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

NO₂ Nitrogen dioxide Good 3,2µg/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 Harper

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 6,6High 😊Good

Tomorrow UV 6,8High 🙂Fair

Sunday UV 5,8Moderate 🙂Fair

Monday UV 6,5High 🙂Fair

Tuesday UV 6,0High 🙂Fair

Wednesday UV 5,0Moderate —Unavailable

Thursday UV 5,0Moderate —Unavailable

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 Harper

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · HARPER, IOWA

Tonight's Stargazing & Shooting Stars

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

97/100Best-hour score

BEST TIME TONIGHT 2:00 AM–3:00 AM Astronomical darkness: 8:59 PM–5:11 AM

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

☾ Moonlight 0% New Moon · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 57° 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.

DISCOVER WEATHER NEARBY Weather in other cities

Explore current conditions and forecasts for other locations.

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Forecast data for Harper were last refreshed today at 9:46 PM. The current forecast period extends through 13/09/2026 at 7:00 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.