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Johnston IA Weather - Mostly Cloudy - 55°F
Mostly Cloudy
55°F
Updated 6:20 am
Feels Like 56°F
Humidity 93%
Wind N 0 mph
Barometer  30.11 in
Dew Point 53°F
Johnston IA Weather - Mostly Cloudy - 13°C
Mostly Cloudy
13°C
Updated 6:20 am
Feels Like 13°C
Humidity 93%
Wind N 0 km/h
Barometer  102 kPa
Dew Point 12°C
Johnston, IA Weather and Current Conditionsjohnston ia weather forecast

Johnston, IA Weather Forecast

Johnston Iowa WeatherJohnston, Iowa Weather Weather Forecast
Here is the API 14 day weather forecast for Johnston, Iowa. Note: The 7-day weather forecast for Johnston, IA is the most reliable and accurate weather forecast. This template should only be used as a probable scenario. Forecasting weather beyond the next 7 days is a challenge.
Johnston, IA Weather Forecast Dated: 620 AM Sun Sep 13 2026
Expect a mild stretch with more clouds than sun and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.

Sunday, September 13, 2026

Mid-Morning
Johnston Weather - 2026-09-13 - Morning - Cloudy
61°F 16°C
Cloudy
Mid-Afternoon
Johnston Weather - 2026-09-13 - Afternoon - Overcast
74°F 23°C
Overcast
Early-Evening
Johnston Weather - 2026-09-13 - Evening - Sunny
67°F 19°C
Sunny
Pleasant near 74°F 23°C, cloudy in the morning, overcast in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds turning from the NE to the E at 10 mph 16 km/h.

Monday, September 14, 2026

Mid-Morning
Johnston Weather - 2026-09-14 - Morning - Light Showers
56°F 13°C
Light Showers
Mid-Afternoon
Johnston Weather - 2026-09-14 - Afternoon - Light Showers
71°F 21°C
Light Showers
Early-Evening
Johnston Weather - 2026-09-14 - Evening - Scattered Showers
78°F 26°C
Scattered Showers
Comfortable with temperatures reaching 71°F 21°C, scattered downpours possible, with lower humidity and barometric pressure falling. Winds switching from the SE to the S at 13 mph 21 km/h. Gusts up to 24 mph 37 km/h.

Tuesday, September 15, 2026

Mid-Morning
Johnston Weather - 2026-09-15 - Morning - Light Showers
68°F 20°C
Light Showers
Mid-Afternoon
Johnston Weather - 2026-09-15 - Afternoon - Light Showers
64°F 18°C
Light Showers
Early-Evening
Johnston Weather - 2026-09-15 - Evening - Light Showers
65°F 18°C
Light Showers
Comfortable at 64°F 18°C, on-and-off showers throughout the day, with lower humidity and barometric pressure rising.

Wednesday, September 16, 2026

Mid-Morning
Johnston Weather - 2026-09-16 - Morning - Light Showers
59°F 15°C
Light Showers
Mid-Afternoon
Johnston Weather - 2026-09-16 - Afternoon - Heavy Rain Showers
62°F 16°C
Heavy Rain Showers
Early-Evening
Johnston Weather - 2026-09-16 - Evening - Light Fog
61°F 16°C
Light Fog
Cool with a high near 62°F 16°C, intermittent showers through midday, easing by evening, with increasing humidity and steady pressure. Winds moving from the E to the ENE at 8 mph 13 km/h.

Thursday, September 17, 2026

Mid-Morning
Johnston Weather - 2026-09-17 - Morning - Light Showers
62°F 17°C
Light Showers
Mid-Afternoon
Johnston Weather - 2026-09-17 - Afternoon - Scattered Showers
70°F 21°C
Scattered Showers
Early-Evening
Johnston Weather - 2026-09-17 - Evening - Overcast
69°F 21°C
Overcast
Mild with a high of 70°F 21°C, scattered downpours possible, with steady humidity and steady pressure.

Friday, September 18, 2026

Mid-Morning
Johnston Weather - 2026-09-18 - Morning - Light Showers
64°F 18°C
Light Showers
Mid-Afternoon
Johnston Weather - 2026-09-18 - Afternoon - Scattered Showers
69°F 21°C
Scattered Showers
Early-Evening
Johnston Weather - 2026-09-18 - Evening - Light Showers
69°F 21°C
Light Showers
Pleasant near 69°F 21°C, locally heavy downpours at times, with steady humidity and barometric pressure falling. Winds swinging from the ESE to the E at 11 mph 18 km/h. Gusts up to 22 mph 35 km/h.

Saturday, September 19, 2026

Mid-Morning
Johnston Weather - 2026-09-19 - Morning - Fog
68°F 20°C
Fog
Mid-Afternoon
Johnston Weather - 2026-09-19 - Afternoon - Scattered Showers
65°F 19°C
Scattered Showers
Early-Evening
Johnston Weather - 2026-09-19 - Evening - Light Showers
63°F 17°C
Light Showers
Comfortable at 65°F 19°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds shifting from the SSE to the NW at 9 mph 15 km/h.

Sunday, September 20, 2026

Mid-Morning
Johnston Weather - 2026-09-20 - Morning - Overcast
58°F 15°C
Overcast
Mid-Afternoon
Johnston Weather - 2026-09-20 - Afternoon - Scattered Showers
62°F 17°C
Scattered Showers
Early-Evening
Johnston Weather - 2026-09-20 - Evening - Scattered Showers
64°F 18°C
Scattered Showers
Cool with a high near 62°F 17°C, scattered downpours possible, with lower humidity and steady pressure. Winds turning from the NNE to the NE at 8 mph 13 km/h. Gusts up to 23 mph 37 km/h.

Monday, September 21, 2026

Mid-Morning
Johnston Weather - 2026-09-21 - Morning - Sunny
60°F 16°C
Sunny
Mid-Afternoon
Johnston Weather - 2026-09-21 - Afternoon - Partly Cloudy
69°F 20°C
Partly Cloudy
Early-Evening
Johnston Weather - 2026-09-21 - Evening - Overcast
64°F 18°C
Overcast
Mild temperatures up to 69°F 20°C, sunny in the morning, becoming cloudy through the afternoon and evening, with steady humidity and steady pressure. Winds switching from the ENE to the NE at 10 mph 16 km/h. Gusts up to 21 mph 33 km/h.

Tuesday, September 22, 2026

Mid-Morning
Johnston Weather - 2026-09-22 - Morning - Sunny
58°F 14°C
Sunny
Mid-Afternoon
Johnston Weather - 2026-09-22 - Afternoon - Overcast
66°F 19°C
Overcast
Early-Evening
Johnston Weather - 2026-09-22 - Evening - Overcast
63°F 17°C
Overcast
Mildly cool near 66°F 19°C, sunny in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds moving from the NE to the NNE at 9 mph 15 km/h.

Wednesday, September 23, 2026

Mid-Morning
Johnston Weather - 2026-09-23 - Morning - Light Fog
56°F 14°C
Light Fog
Mid-Afternoon
Johnston Weather - 2026-09-23 - Afternoon - Cloudy
62°F 17°C
Cloudy
Early-Evening
Johnston Weather - 2026-09-23 - Evening - Scattered Showers
61°F 16°C
Scattered Showers
Comfortable at 62°F 17°C, scattered downpours possible, with steady humidity and steady pressure. Winds swinging from the NNE to the E at 7 mph 11 km/h.

Thursday, September 24, 2026

Mid-Morning
Johnston Weather - 2026-09-24 - Morning - Fog
62°F 16°C
Fog
Mid-Afternoon
Johnston Weather - 2026-09-24 - Afternoon - Scattered Showers
69°F 21°C
Scattered Showers
Early-Evening
Johnston Weather - 2026-09-24 - Evening - Scattered Showers
70°F 21°C
Scattered Showers
Comfortable with temperatures reaching 69°F 21°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds out of the SSE at 9 mph 15 km/h.

Friday, September 25, 2026

Mid-Morning
Johnston Weather - 2026-09-25 - Morning - Light Fog
68°F 20°C
Light Fog
Mid-Afternoon
Johnston Weather - 2026-09-25 - Afternoon - Sunny
82°F 28°C
Sunny
Early-Evening
Johnston Weather - 2026-09-25 - Evening - Sunny
78°F 26°C
Sunny
Quite warm around 82°F 28°C, sunny throughout the day, with steady humidity and steady pressure. Winds blowing from the SSW at 12 mph 20 km/h.

Saturday, September 26, 2026

Mid-Morning
Johnston Weather - 2026-09-26 - Morning - Sunny
72°F 22°C
Sunny
Mid-Afternoon
Johnston Weather - 2026-09-26 - Afternoon - Sunny
84°F 29°C
Sunny
Early-Evening
Johnston Weather - 2026-09-26 - Evening - Sunny
79°F 26°C
Sunny
Quite warm reaching 84°F 29°C, feeling like 87°F 30°C during peak afternoon, sunny throughout the day, with steady humidity and barometric pressure falling. Winds switching from the SSE to the SE at 15 mph 25 km/h. Gusts up to 32 mph 51 km/h.

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Weather by the Numbers

Sun, 13th
Johnston IA Weather - Sunday, Sep 13, 2026 - Patchy Rain Nearby
Hi: 74°F 23°C
Lo: 59°F 15°C
Sunrise 06:53 AM
Sunset 07:28 PM
Wind ENE 10 mph16 km/h
Dew Point 44°F7°C
uv Index 5
Barometric Pressure 30.12 in1020 mb
POP 7% *
Humidity 37%
Mon, 14th
Johnston IA Weather - Monday, Sep 14, 2026 - Light Rain Shower
Hi: 81°F 27°C
Lo: 55°F 13°C
Sunrise 06:54 AM
Sunset 07:26 PM
Wind SE 21 mph34 km/h
Dew Point 57°F14°C
uv Index 5
Barometric Pressure 30.03 in1017 mb
POP 46% *
Humidity 82%
Tue, 15th
Johnston IA Weather - Tuesday, Sep 15, 2026 - Light Rain Shower
Hi: 70°F 21°C
Lo: 64°F 18°C
Sunrise 06:55 AM
Sunset 07:24 PM
Wind N 11 mph18 km/h
Dew Point 61°F16°C
uv Index 1
Barometric Pressure 30.03 in1017 mb
POP 64% *
Humidity 86%
Wed, 16th
Johnston IA Weather - Wednesday, Sep 16, 2026 - Light Rain Shower
Hi: 65°F 18°C
Lo: 57°F 14°C
Sunrise 06:56 AM
Sunset 07:22 PM
Wind E 7 mph11 km/h
Dew Point 58°F15°C
uv Index 1
Barometric Pressure 30.21 in1023 mb
POP 78% *
Humidity 95%
Thu, 17th
Johnston IA Weather - Thursday, Sep 17, 2026 - Light Rain Shower
Hi: 70°F 21°C
Lo: 58°F 15°C
Sunrise 06:57 AM
Sunset 07:21 PM
Wind NNW 5 mph9 km/h
Dew Point 62°F17°C
uv Index 4
Barometric Pressure 30.12 in1020 mb
POP 50% *
Humidity 95%
Fri, 18th
Johnston IA Weather - Friday, Sep 18, 2026 - Patchy Rain Nearby
Hi: 70°F 21°C
Lo: 63°F 17°C
Sunrise 06:58 AM
Sunset 07:19 PM
Wind ESE 10 mph16 km/h
Dew Point 64°F18°C
uv Index 4
Barometric Pressure 30.12 in1020 mb
POP 26% *
Humidity 89%
Sat, 19th
Johnston IA Weather - Saturday, Sep 19, 2026 - Overcast
Hi: 70°F 21°C
Lo: 60°F 16°C
Sunrise 06:59 AM
Sunset 07:17 PM
Wind WSW 8 mph13 km/h
Dew Point 67°F19°C
uv Index 5
Barometric Pressure 29.91 in1013 mb
POP 30% *
Humidity 90%
Sun, 20th
Johnston IA Weather - Sunday, Sep 20, 2026 - Patchy Rain Nearby
Hi: 64°F 18°C
Lo: 57°F 14°C
Sunrise 07:00 AM
Sunset 07:15 PM
Wind NNE 13 mph21 km/h
Dew Point 57°F14°C
uv Index 4
Barometric Pressure 30.06 in1018 mb
POP 30% *
Humidity 90%
Mon, 21st
Johnston IA Weather - Monday, Sep 21, 2026 - Sunny
Hi: 69°F 20°C
Lo: 58°F 14°C
Sunrise 07:01 AM
Sunset 07:14 PM
Wind ENE 14 mph22 km/h
Dew Point 52°F11°C
uv Index 5
Barometric Pressure 30.06 in1018 mb
POP 5% *
Humidity 61%
Tue, 22nd
Johnston IA Weather - Tuesday, Sep 22, 2026 - Sunny
Hi: 67°F 19°C
Lo: 54°F 12°C
Sunrise 07:02 AM
Sunset 07:12 PM
Wind NE 12 mph19 km/h
Dew Point 51°F11°C
uv Index 5
Barometric Pressure 29.97 in1015 mb
POP 10% *
Humidity 65%
Wed, 23rd
Johnston IA Weather - Wednesday, Sep 23, 2026 - Overcast
Hi: 62°F 17°C
Lo: 56°F 13°C
Sunrise 07:03 AM
Sunset 07:10 PM
Wind ENE 10 mph15 km/h
Dew Point 55°F13°C
uv Index 4
Barometric Pressure 29.97 in1015 mb
POP 21% *
Humidity 83%
Thu, 24th
Johnston IA Weather - Thursday, Sep 24, 2026 - Mist
Hi: 70°F 21°C
Lo: 59°F 15°C
Sunrise 07:05 AM
Sunset 07:08 PM
Wind SSE 8 mph13 km/h
Dew Point 62°F17°C
uv Index 4
Barometric Pressure 29.88 in1012 mb
POP 30% *
Humidity 89%
Fri, 25th
Johnston IA Weather - Friday, Sep 25, 2026 - Sunny
Hi: 83°F 28°C
Lo: 65°F 18°C
Sunrise 07:06 AM
Sunset 07:07 PM
Wind S 12 mph19 km/h
Dew Point 63°F17°C
uv Index 6
Barometric Pressure 29.94 in1014 mb
POP 4% *
Humidity 63%
Sat, 26th
Johnston IA Weather - Saturday, Sep 26, 2026 - Sunny
Hi: 84°F 29°C
Lo: 68°F 20°C
Sunrise 07:07 AM
Sunset 07:05 PM
Wind SSE 14 mph23 km/h
Dew Point 65°F19°C
uv Index 7
Barometric Pressure 30 in1016 mb
POP 4% *
Humidity 62%
* POP = Probability of Precipitation. Data for 12:00 PM.