Local Weather

Johnston Weather Forecast

Temperature, wind, rain and more for Johnston

Iowa, United States Of America

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 18
Apr
03:00

NNW
NNW

10 / 15 mph 53 / 49°F 71% 1015 mb
Low level cloud: 0%
Mid level cloud: 98%
High level cloud: 33%
Most Significant Cloud Type: medium
99%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NNE
NNE

14 / 19 mph 48 / 42°F 90% 1018 mb
Low level cloud: 98%
Mid level cloud: 99%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
09:00

NNE
NNE

9 / 11 mph 48 / 44°F 93% 1019 mb
Low level cloud: 95%
Mid level cloud: 89%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.09 In of precipitation over the past 3 hours.
0.09 In
12:00

NNW
NNW

10 / 13 mph 49 / 45°F 84% 1019 mb
Low level cloud: 82%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
15:00

NNW
NNW

10 / 12 mph 59 / 56°F 53% 1017 mb
Low level cloud: 6%
Mid level cloud: 37%
High level cloud: 6%
Most Significant Cloud Type: medium
53%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NW
NW

17 / 25 mph 54 / 48°F 51% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NW
NW

9 / 15 mph 47 / 43°F 57% 1021 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 9%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 19
Apr
00:00

WNW
WNW

8 / 16 mph 42 / 37°F 69% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

8 / 16 mph 40 / 35°F 66% 1023 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 17%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WNW
WNW

8 / 17 mph 39 / 33°F 60% 1024 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 2%
Most Significant Cloud Type: medium
47%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WNW
WNW

17 / 20 mph 52 / 46°F 36% 1023 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: medium
46%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WNW
WNW

21 / 23 mph 56 / 51°F 31% 1023 mb
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 6%
Most Significant Cloud Type: medium
32%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WNW
WNW

19 / 22 mph 57 / 52°F 33% 1022 mb
Low level cloud: 0%
Mid level cloud: 63%
High level cloud: 6%
Most Significant Cloud Type: medium
62%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WNW
WNW

14 / 21 mph 52 / 47°F 45% 1022 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 16%
Most Significant Cloud Type: medium
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

7 / 15 mph 44 / 40°F 56% 1024 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 18%
Most Significant Cloud Type: medium
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
The 7 day weather forecast summary for Johnston:

For Johnston in the coming week the average daytime maximum temperature will be around 16°C, with a high for the week of 19°C expected on the afternoon of Tuesday 23rd. The mean minimum temperature will be 6°C, dipping to its lowest on the morning of Saturday 20th at 3°C. The coming week will have mostly dry days although Thursday is likely to see a little rain. Predictions are Thursday 20th will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be moderate.

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image � it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure