Weather StoryAlmanac, microseasons, and the day's weather story.

Weather in Johnston, Iowa

Roses Bloom Along the Shelter Rows. Day 59 of spring. Read this microseason across nine climate regions →

Johnston, IA
Sunday, May 17 at 1:01 AM
73
°
Overcast
Feels like
75°
Humidity
75%
Wind
7 mph
Sunrise
5:53 AM
Sunset
8:28 PM
Johnston, IA
Hour by hour · 24h
71°
8p
70°
9p
68°
10p
66°
11p
65°
12a
63°
1a
61°
2a
60°
3a
59°
4a
56°
5a
55°
6a
57°
7a
62°
8a
66°
9a
71°
10a
75°
11a
79°
12p
82°
1p
85°
2p
87°
3p
87°
4p
87°
5p
83°
6p
83°
7p
L 55°H 87°
Johnston, IA
7-day forecast
  1. Today
    May 16
    Thunderstorm
    52%
    79°59°
  2. Sunday
    May 17
    Thunderstorm
    61%
    80°63°
  3. Monday
    May 18
    Thunderstorm
    92%
    83°62°
  4. Tuesday
    May 19
    Drizzle
    92%
    64°47°
  5. Wednesday
    May 20
    Overcast
    —
    61°41°
  6. Thursday
    May 21
    Overcast
    —
    65°45°
  7. Friday
    May 22
    Overcast
    10%
    67°55°
Johnston, IA
Next 24 hours · Mild now
HOT 90°45°70°95°12a6a12p6pnow 71°high 87°low 55°
Johnston, IA
Anemometer · 24h winds · from true
NESW
From · True
SE
145° · backing 94°
Direction
SE
145°
Sustained
7
mph
Gust
19
mph
Peak 24h
52
avg 7
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 7 · pk 52 @ 9:00p
−24h−18h−12h−6hnow
Light breeze backing 94° from the se.
Johnston, IA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
978.7
+1.8 mb in 3h · rising rapidly · 28.90 inHg
Now
978.7
mb
3h
+1.8
mb
12h
-1.4
mb
24h
+1.5
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 976–980
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Johnston, IA
Air quality
59
AQI
Moderate
PM 2.5
5.3 μg/m³
PM 10
6.2 μg/m³
NO₂
4.7 μg/m³
Ozone
90.0 μg/m³
UV Index
0.1 Low
Johnston, IA
Almanac · Sunday, May 17
When the dew is on the grass, rain will never come to pass.
Civil dawn
10:23 AM
Sunrise
5:53 AM
Daylight
14h 35m
Sunset
8:28 PM
Civil dusk
2:01 AM
Planting note
Direct sow okra, melons, and southern peas. Thin carrot rows.
Johnston, IA
The moon
New Moon
0% illuminated
Moonrise
10:57 AM
Moonset
2:02 AM
In sign
♉︎ Taurus
Johnston, IA
Microseason · 28 of 72
May 16–20

Roses Bloom Along the Shelter Rows

plant
Jan 137% of the yearDec 31

Read this microseason across nine climate regions →

Johnston at a glance

  • Today vs. normal: 3°F above the seasonal normal for this latitude
  • Last frost: April 26 (climatological average for this latitude)
  • Microseason: 28 of 72, May 16–20
  • Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.

Right now in the garden

Warm-season window is open

As of May 17, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.

All cities in Iowa →

ZIP codes in Johnston

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.