Live Weather & Forecast
Weather in Johnston
Iowa, United States · Real-time conditions & 3-day outlook
15°C
Feels like 15°C
59°F / Feels 59°F
Light rain
Johnston, Iowa
🌞 Daytime
Updated: 2026-04-15 10:15
Humidity
100%
Wind
19.4 km/h SW
Wind Gust
24.5 km/h
Pressure
1008 mb
Visibility
4.8 km
UV Index
2.6
(Low)
Precipitation
0 mm
Cloud Cover
100%
Dew Point
16.2°C
Wind Degree
215°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
153.9 μg/m³
NO₂
3 μg/m³
O₃
76 μg/m³
SO₂
1.3 μg/m³
PM 2.5
4.6 μg/m³
PM 10
5.1 μg/m³
Today's Hourly Forecast
24-hour breakdown for Johnston, Iowa
12 AM
19°
Patchy rain nearby
1 AM
18°
Patchy rain nearby
2 AM
17°
Moderate rain at times
3 AM
17°
Patchy rain nearby
4 AM
16°
Patchy rain nearby
5 AM
16°
Patchy rain nearby
6 AM
15°
Mist
7 AM
15°
Mist
8 AM
16°
Mist
9 AM
17°
Mist
10 AM
15°
Light rain
11 AM
18°
Partly Cloudy
12 PM
19°
Patchy rain nearby
1 PM
19°
Light drizzle
2 PM
21°
Patchy rain nearby
3 PM
23°
Partly Cloudy
4 PM
24°
Sunny
5 PM
24°
Sunny
6 PM
21°
Partly Cloudy
7 PM
18°
Cloudy
8 PM
17°
Partly Cloudy
9 PM
16°
Clear
10 PM
15°
Cloudy
11 PM
14°
Cloudy
3-Day Forecast
Daily overview for Johnston, Iowa
Today
Moderate rain
26°
/
14°
🌧️ 84% chance of rain
💧 Avg. humidity: 90%
💨 Max wind: 22.7 km/h
🌧️ Total precip: 14.43 mm
☀️ UV Index: 1.1
🌅 Sunrise: 06:34 AM
🌇 Sunset: 07:56 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Thu, Apr 16
Partly Cloudy
28°
/
9°
🌧️ 0% chance of rain
💧 Avg. humidity: 78%
💨 Max wind: 23.8 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:33 AM
🌇 Sunset: 07:57 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Moderate rain
23°
/
5°
🌧️ 89% chance of rain
💧 Avg. humidity: 88%
💨 Max wind: 38.5 km/h
🌧️ Total precip: 13.27 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:31 AM
🌇 Sunset: 07:58 PM
🌙 New Moon
🌑 Moon: 0% lit
Best Time to Visit Johnston
Plan your trip to Johnston, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Johnston?
Current conditions in Johnston: Light rain, temperature 15°C, humidity 100%.
What is the best time to visit Johnston?
The best time to visit Johnston is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Johnston?
Johnston is located at approximately 41.7° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Johnston?
The wettest period in Johnston is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Johnston?
For visits to Johnston during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Johnston in?
Johnston is located in United States, in the state of Iowa.
What are the public holidays in Johnston in 2026?
View the 2026 public holidays for Johnston on our Holidays page.
What are the GPS coordinates used for the weather forecast in Johnston?
The weather forecast for Johnston uses coordinates 41.6732, -93.6973.