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Johnson County (Iowa City)
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United States weather

Weather in Johnson County, Iowa for August 2025

Your guide to Johnson County weather in August - trends and predictions

    Official Weather Alert ⚠️

  • Flood Warning - See hour by hour.

    • Temperatures

  • Until now, August 2025 in Johnson County has been nearly identical to the historical average, with a temperature of 28.9 °F (showing only a slight deviation of 0.4 °F).

  • The forecast for the upcoming days in Johnson County predicts a temperature of 24.8 °F, which is slightly above the historical average.

  • In general, the average temperature in Johnson County at the beginning of August is 26.3 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 23.4 °F by the end of August.

    • Rain 🌧️

  • Johnson County experiences moderate rainfall in August, with an average of 10 rainy days and a total precipitation of 449.8 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
21
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/18°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Johnson County Weather August

Move between months or click on a day
July
September
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
23°
2
Mist
24°
3
Mist
25°
4
Partly cloudy
27°
5
Fog
27°
6
Thundery outbreaks possible
30°
7
Moderate rain
28°
8
Thundery outbreaks possible
33°
9
Thundery outbreaks possible
35°
10
Torrential rain shower
26°
11
Heavy rain
26°
12
Light rain shower
28°
13
Mist
28°
14
Fog
30°
15
Overcast
31°
16
Thundery outbreaks possible
37°
17
Fog
35°
18
Moderate or heavy rain with thunder
34°
19
Patchy rain possible
27°
20
Cloudy
24°
21
Overcast
25°
22
Cloudy
25°
23
Partly cloudy
26°
24
Patchy rain possible
27°
25
Weather Alert Sunny
23°
26
Weather Alert Sunny
26°
27
Sunny
26°
28
Patchy rain possible
25°
29
Partly cloudy
22°
30
Partly cloudy
22°
31
Partly cloudy
20°

Temperatures trend during August in Johnson County

See the weather trend as well as the moving average line

August weather in Johnson County day by day

Click on a date for more information
July September
Date Weather Temperatures Rain UV More
Aug. 1 Overcast
Overcast
 23° /11° 0 mm 5
Aug. 2 Mist
Mist
 24° /13° 0 mm 5
Aug. 3 Mist
Mist
 25° /13° 0 mm 6
Aug. 4 Partly cloudy
Partly cloudy
 27° /14° 0 mm 7
Aug. 5 Fog
Fog
 27° /19° 0 mm 6
Aug. 6 Thundery outbreaks possible
Thundery outbreaks possible
 30° /18° 0 mm 7
Aug. 7 Moderate rain
Moderate rain
 28° /20° 20.2 mm 6
Aug. 8 Thundery outbreaks possible
Thundery outbreaks possible
 33° /22° 0 mm 7
Aug. 9 Thundery outbreaks possible
Thundery outbreaks possible
 35° /23° 0 mm 8
Aug. 10 Torrential rain shower
Torrential rain shower
 26° /20° 315.4 mm 6
Aug. 11 Heavy rain
Heavy rain
 26° /21° 65.7 mm 6
Aug. 12 Light rain shower
Light rain shower
 28° /21° 3.3 mm 6
Aug. 13 Mist
Mist
 28° /14° 15.1 mm 6
Aug. 14 Fog
Fog
 30° /16° 0 mm 7
Aug. 15 Overcast
Overcast
 31° /16° 0 mm 7
Aug. 16 Thundery outbreaks possible
Thundery outbreaks possible
 37° /23° 0 mm 8
Aug. 17 Fog
Fog
 35° /23° 0 mm 8
Aug. 18 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 34° /24° 11.3 mm 7
Aug. 19 Patchy rain possible
Patchy rain possible
 27° /18° 2 mm 6
Aug. 20 Cloudy
Cloudy
 24° /15° 0 mm 5
Aug. 21 Overcast
Overcast
 25° /14° 0 mm 6
Aug. 22 Cloudy
Cloudy
 25° /12° 0 mm 6
Aug. 23 Partly cloudy
Partly cloudy
 26° /13° 0 mm 7
Aug. 24 Patchy rain possible
Patchy rain possible
 27° /14° 0.3 mm 6
Aug. 25 Sunny
Sunny
 23° /7° 0 mm 1.8
Aug. 26 Sunny
Sunny
 26° /7° 0 mm 1.7
Aug. 27 Sunny
Sunny
 26° /10° 0 mm 1.2
Aug. 28 Patchy rain possible
Patchy rain possible
 25° /15° 0.5 mm 1.6
Aug. 29 Partly cloudy
Partly cloudy
 22° /13° 0 mm 0
Aug. 30 Partly cloudy
Partly cloudy
 22° /14° 0.1 mm 5
Aug. 31 Partly cloudy
Partly cloudy
 20° /16° 0.1 mm 5
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Important Notice
Our weather forecast for Johnson County in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Johnson County forecast closer to your planned date for the most up-to-date weather information.
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Johnson County in August - FAQ

What are the expected maximum and minimum temperatures in Johnson County during August?
During August, expect a variety of temperatures with highs around 29° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in Johnson County during August?
Significant rainfall exceeding 449.8 mm is expected in Johnson County during August, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Johnson County during August?
The average wind speed in Johnson County during August is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

August rainfall patterns in Johnson County

Explore the daily rainfall trends and prepare for Johnson Countys August weather 💧

UV exposure in Johnson County during August

Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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Location coordinates Where is Johnson County?

Get accurate weather forecasts for Johnson County, located at latitude 41.661 and longitude -91.53. Stay updated with localized weather information tailored for Johnson County.

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