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

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

Now · 6:16 PM

Denison Weather & Hourly Forecast

United States · Iowa · 51442

90°F

Sunny

Feels like: 99°F

💧 Humidity 57% 🌡 Pressure 29.77 inHg 💨 Wind 13 mph 👁 Visibility 6.2 mi ☁ Clouds 2% ☀️ UV index 0.9 · Low 🌅 Sunrise 6:49 AM 🌇 Sunset 7:52 PM

Hourly Forecast for Denison

Today

7:00 PM

Sunny

90° 💧 None 💨 13 mph H 57%29.77 inHg

10:00 PM

Light rain

85° 💧 0.01 in 💨 22 mph H 60%29.80 inHg

Tomorrow

1:00 AM

Mostly cloudy night

78° 💧 0.02 in 💨 13 mph H 41%29.74 inHg

4:00 AM

Overcast night

71° 💧 None 💨 10 mph H 76%29.77 inHg

7:00 AM

Mostly cloudy

75° 💧 None 💨 11 mph H 70%29.80 inHg

10:00 AM

Sunny

84° 💧 None 💨 14 mph H 38%29.83 inHg

1:00 PM

Mostly sunny

91° 💧 None 💨 11 mph H 27%29.80 inHg

4:00 PM

Overcast

97° 💧 None 💨 8 mph H 22%29.77 inHg

7:00 PM

Mostly cloudy

93° 💧 None 💨 2 mph H 24%29.71 inHg

10:00 PM

Partly cloudy night

83° 💧 None 💨 12 mph H 51%29.83 inHg

Saturday

1:00 AM

Mostly cloudy night

74° 💧 None 💨 7 mph H 62%29.88 inHg

4:00 AM

Mostly cloudy night

70° 💧 None 💨 8 mph H 71%29.85 inHg

7:00 AM

Mostly cloudy

73° 💧 None 💨 6 mph H 73%29.88 inHg

10:00 AM

Mostly cloudy

90° 💧 None 💨 7 mph H 38%29.91 inHg

1:00 PM

Mostly cloudy

104° 💧 None 💨 2 mph H 24%29.85 inHg

4:00 PM

Partly cloudy

107° 💧 None 💨 6 mph H 17%29.83 inHg

Today

7:00 PM

Sunny

90° 💧 None 💨 13 mph H 57%29.77 inHg

8:00 PM

Clear night

91° 💧 None 💨 12 mph H 52%29.74 inHg

9:00 PM

Clear night

90° 💧 None 💨 12 mph H 47%29.71 inHg

10:00 PM

Light rain

85° 💧 0.01 in 💨 22 mph H 60%29.80 inHg

11:00 PM

Partly cloudy night

84° 💧 None 💨 7 mph H 38%29.74 inHg

Tomorrow

12:00 AM

Mostly cloudy night

80° 💧 None 💨 16 mph H 35%29.74 inHg

1:00 AM

Mostly cloudy night

78° 💧 None 💨 13 mph H 41%29.74 inHg

2:00 AM

Light rain

73° 💧 0.01 in 💨 11 mph H 64%29.77 inHg

3:00 AM

Light rain

71° 💧 0.01 in 💨 10 mph H 78%29.77 inHg

4:00 AM

Overcast night

71° 💧 None 💨 10 mph H 76%29.77 inHg

5:00 AM

Overcast night

72° 💧 None 💨 10 mph H 75%29.77 inHg

6:00 AM

Overcast night

71° 💧 None 💨 10 mph H 74%29.80 inHg

7:00 AM

Mostly cloudy

75° 💧 None 💨 11 mph H 70%29.80 inHg

8:00 AM

Sunny

79° 💧 None 💨 11 mph H 61%29.83 inHg

9:00 AM

Sunny

83° 💧 None 💨 14 mph H 47%29.83 inHg

10:00 AM

Sunny

84° 💧 None 💨 14 mph H 38%29.83 inHg

11:00 AM

Sunny

85° 💧 None 💨 14 mph H 35%29.83 inHg

12:00 PM

Sunny

88° 💧 None 💨 12 mph H 31%29.83 inHg

1:00 PM

Mostly sunny

91° 💧 None 💨 11 mph H 27%29.80 inHg

2:00 PM

Overcast

93° 💧 None 💨 10 mph H 26%29.80 inHg

3:00 PM

Overcast

94° 💧 None 💨 9 mph H 24%29.77 inHg

4:00 PM

Overcast

97° 💧 None 💨 8 mph H 22%29.77 inHg

5:00 PM

Overcast

96° 💧 None 💨 6 mph H 20%29.74 inHg

6:00 PM

Mostly cloudy

96° 💧 None 💨 4 mph H 19%29.74 inHg

7:00 PM

Mostly cloudy

93° 💧 None 💨 2 mph H 24%29.71 inHg

8:00 PM

Clear night

89° 💧 None 💨 6 mph H 27%29.74 inHg

9:00 PM

Clear night

85° 💧 None 💨 11 mph H 46%29.83 inHg

10:00 PM

Partly cloudy night

83° 💧 None 💨 12 mph H 51%29.83 inHg

11:00 PM

Partly cloudy night

80° 💧 None 💨 11 mph H 59%29.83 inHg

Saturday

12:00 AM

Mostly cloudy night

75° 💧 None 💨 10 mph H 61%29.85 inHg

1:00 AM

Mostly cloudy night

74° 💧 None 💨 7 mph H 62%29.88 inHg

2:00 AM

Mostly cloudy night

71° 💧 None 💨 8 mph H 68%29.88 inHg

3:00 AM

Partly cloudy night

71° 💧 None 💨 8 mph H 70%29.85 inHg

4:00 AM

Mostly cloudy night

70° 💧 None 💨 8 mph H 71%29.85 inHg

5:00 AM

Mostly cloudy night

70° 💧 None 💨 7 mph H 72%29.85 inHg

6:00 AM

Mostly cloudy night

68° 💧 None 💨 6 mph H 74%29.88 inHg

7:00 AM

Mostly cloudy

73° 💧 None 💨 6 mph H 73%29.88 inHg

8:00 AM

Sunny

77° 💧 None 💨 3 mph H 62%29.91 inHg

9:00 AM

Partly cloudy

84° 💧 None 💨 3 mph H 46%29.88 inHg

10:00 AM

Mostly cloudy

90° 💧 None 💨 7 mph H 38%29.91 inHg

11:00 AM

Mostly cloudy

95° 💧 None 💨 2 mph H 33%29.91 inHg

12:00 PM

Mostly cloudy

100° 💧 None 💨 1 mph H 28%29.88 inHg

1:00 PM

Mostly cloudy

104° 💧 None 💨 2 mph H 24%29.85 inHg

2:00 PM

Overcast

104° 💧 None 💨 5 mph H 22%29.85 inHg

3:00 PM

Mostly cloudy

106° 💧 None 💨 6 mph H 19%29.83 inHg

4:00 PM

Partly cloudy

107° 💧 None 💨 6 mph H 17%29.83 inHg

5:00 PM

Partly cloudy

106° 💧 None 💨 7 mph H 16%29.80 inHg

6:00 PM

Partly cloudy

105° 💧 None 💨 8 mph H 16%29.77 inHg

7:00 PM

Mostly sunny

102° 💧 None 💨 9 mph H 19%29.77 inHg

8:00 PM

Clear night

91° 💧 None 💨 8 mph H 27%29.83 inHg

9:00 PM

Clear night

86° 💧 None 💨 10 mph H 35%29.83 inHg

10:00 PM

Clear night

83° 💧 None 💨 6 mph H 41%29.88 inHg

11:00 PM

Light rain

74° 💧 0.03 in 💨 6 mph H 70%29.91 inHg

Sunday

12:00 AM

Light rain

74° 💧 0.01 in 💨 8 mph H 72%29.88 inHg

1:00 AM

Partly cloudy night

72° 💧 None 💨 10 mph H 78%29.88 inHg

2:00 AM

Light rain

71° 💧 0.01 in 💨 9 mph H 82%29.88 inHg

3:00 AM

Light rain

72° 💧 0.01 in 💨 8 mph H 79%29.91 inHg

4:00 AM

Light rain

72° 💧 0.02 in 💨 1 mph H 80%29.91 inHg

5:00 AM

Overcast night

72° 💧 None 💨 6 mph H 79%29.91 inHg

6:00 AM

Overcast night

72° 💧 None 💨 9 mph H 82%29.91 inHg

7:00 AM

Overcast

71° 💧 None 💨 9 mph H 87%29.91 inHg

8:00 AM

Overcast

72° 💧 None 💨 8 mph H 85%29.94 inHg

9:00 AM

Overcast

76° 💧 None 💨 8 mph H 75%29.94 inHg

10:00 AM

Overcast

82° 💧 None 💨 10 mph H 59%29.91 inHg

11:00 AM

Overcast

86° 💧 None 💨 9 mph H 48%29.91 inHg

12:00 PM

Overcast

87° 💧 None 💨 4 mph H 44%29.91 inHg

1:00 PM

Overcast

89° 💧 None 💨 13 mph H 40%29.88 inHg

2:00 PM

Overcast

90° 💧 None 💨 12 mph H 39%29.88 inHg

3:00 PM

Overcast

97° 💧 None 💨 12 mph H 30%29.83 inHg

4:00 PM

Overcast

100° 💧 None 💨 9 mph H 25%29.80 inHg

5:00 PM

Overcast

90° 💧 None 💨 11 mph H 47%29.83 inHg

6:00 PM

Light rain

85° 💧 0.01 in 💨 21 mph H 58%29.85 inHg

7:00 PM

Overcast

76° 💧 None 💨 18 mph H 78%29.91 inHg

8:00 PM

Light rain

72° 💧 0.03 in 💨 17 mph H 94%29.94 inHg

9:00 PM

Moderate rain

69° 💧 0.04 in 💨 24 mph H 95%29.91 inHg

10:00 PM

Light rain

69° 💧 0.02 in 💨 16 mph H 95%29.94 inHg

11:00 PM

Moderate rain

70° 💧 0.04 in 💨 16 mph H 94%29.97 inHg

Monday

12:00 AM

Light rain

69° 💧 0.02 in 💨 19 mph H 94%29.94 inHg

1:00 AM

Moderate rain

69° 💧 0.04 in 💨 17 mph H 93%29.91 inHg

2:00 AM

Light rain

69° 💧 0.03 in 💨 16 mph H 92%29.91 inHg

3:00 AM

Light rain

68° 💧 0.02 in 💨 8 mph H 93%29.94 inHg

4:00 AM

Light rain

69° 💧 0.01 in 💨 5 mph H 94%29.97 inHg

5:00 AM

Light rain

68° 💧 0.04 in 💨 9 mph H 97%29.97 inHg

6:00 AM

Light rain

68° 💧 0.02 in 💨 12 mph H 97%29.94 inHg

7:00 AM

Light rain

68° 💧 0.02 in 💨 14 mph H 95%29.97 inHg

8:00 AM

Overcast

69° 💧 None 💨 16 mph H 94%29.97 inHg

9:00 AM

Overcast

71° 💧 None 💨 15 mph H 91%29.97 inHg

10:00 AM

Overcast

73° 💧 None 💨 16 mph H 82%29.94 inHg

11:00 AM

Overcast

75° 💧 None 💨 11 mph H 73%29.97 inHg

12:00 PM

Overcast

81° 💧 None 💨 16 mph H 59%29.94 inHg

1:00 PM

Light rain

79° 💧 0.01 in 💨 14 mph H 66%29.91 inHg

2:00 PM

Overcast

86° 💧 None 💨 17 mph H 47%29.88 inHg

3:00 PM

Overcast

89° 💧 None 💨 15 mph H 41%29.88 inHg

4:00 PM

Overcast

96° 💧 None 💨 17 mph H 33%29.83 inHg

5:00 PM

Overcast

96° 💧 None 💨 16 mph H 33%29.80 inHg

6:00 PM

Overcast

95° 💧 None 💨 16 mph H 35%29.80 inHg

In Denison and, more broadly, across the state of Iowa: This evening will feature a mix of sun and clouds, with temperatures remaining quite warm, ranging from 89 to 91 degrees Fahrenheit. Moderate southwest winds will be present, averaging around 11 mph, with gusts reaching up to 21 mph. There is a possibility of rain during the next few hours, with the highest chance being around 80%. Be prepared for brief showers, especially if you're planning outdoor activities. The combination of warm temperatures and the potential for rain and gusty winds could lead to some brief, localized downpours. Conditions are typical for this time of year, so it’s wise to keep an eye on local updates if you plan to be outside.

15-Day Weather Outlook for Denison

TomorrowTomorrow

Light rain 97°/71° 💧 0.02 in 💨 16 mph

Saturday, Sep 5Sat Sep 5

Light rain 107°/68° 💧 0.03 in 💨 10 mph

Sunday, Sep 6Sun Sep 6

Light rain 100°/69° 💧 0.15 in 💨 21 mph

Monday, Sep 7Mon Sep 7

Light rain 96°/68° 💧 0.26 in 💨 17 mph

Tuesday, Sep 8Tue Sep 8

Sunny 107°/77° 💧 None 💨 22 mph

Wednesday, Sep 9Wed Sep 9

Light rain 95°/68° 💧 0.06 in 💨 9 mph

Thursday, Sep 10Thu Sep 10

Light rain 106°/70° 💧 0.00 in 💨 15 mph

Friday, Sep 11Fri Sep 11

Mostly sunny 108°/79° 💧 None 💨 17 mph

Saturday, Sep 12Sat Sep 12

Sunny 104°/80° 💧 None 💨 17 mph

Sunday, Sep 13Sun Sep 13

Light rain 98°/72° 💧 0.09 in 💨 17 mph

Monday, Sep 14Mon Sep 14

Moderate rain 79°/64° 💧 0.46 in 💨 12 mph

Tuesday, Sep 15Tue Sep 15

Sunny 84°/58° 💧 None 💨 7 mph

Wednesday, Sep 16Wed Sep 16

Light rain 83°/61° 💧 0.01 in 💨 13 mph

Thursday, Sep 17Thu Sep 17

Overcast 86°/59° 💧 None 💨 17 mph

Friday, Sep 18Fri Sep 18

Light rain 74°/57° 💧 0.05 in 💨 18 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Denison

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Denison

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 7:00 PM

PM2.5 Fine particles Good 2,7µg/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 3,2µg/m³

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

O₃ Ozone Fair 82,2µg/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 acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Denison

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 7,5High 🙂Fair

Tomorrow UV 7,3High 🙂Fair

Saturday UV 7,4High 🙂Fair

Sunday UV 7,1High 🙂Fair

Monday UV 8,0Very high 🙂Fair

Tuesday UV 9,0Very high —Unavailable

Wednesday UV 7,0High —Unavailable

Hourly UV index today

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.

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 Denison

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

Internal PR simulation: 4.06 Population: 8,260

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Forecast data for Denison were last refreshed today at 6:16 PM. The current forecast period extends through 05/09/2026 at 4:00 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.