Zionsville, Indiana 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Zionsville IN
National Weather Service Forecast for:
Zionsville IN
Issued by: National Weather Service Indianapolis, IN |
Updated: 5:15 am EDT Jun 28, 2025 |
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Overnight
 Scattered T-storms
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Saturday
 Scattered T-storms
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Saturday Night
 Partly Cloudy then Patchy Fog
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Sunday
 Chance T-storms and Patchy Fog
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Sunday Night
 Chance T-storms then Showers Likely
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Monday
 Showers Likely then Showers
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Monday Night
 Showers then Chance Showers
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Tuesday
 Sunny
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Tuesday Night
 Mostly Clear
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Lo 71 °F |
Hi 87 °F |
Lo 70 °F |
Hi 87 °F |
Lo 71 °F |
Hi 85 °F |
Lo 68 °F |
Hi 84 °F |
Lo 65 °F |
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Hazardous Weather Outlook
Overnight
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Scattered showers and thunderstorms. Mostly cloudy, with a low around 71. West southwest wind around 5 mph. Chance of precipitation is 30%. |
Saturday
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Scattered showers and thunderstorms, mainly before 7am. Partly sunny, with a high near 87. West southwest wind 3 to 7 mph. Chance of precipitation is 30%. |
Saturday Night
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Patchy fog after 4am. Otherwise, partly cloudy, with a low around 70. Southwest wind around 5 mph becoming calm in the evening. |
Sunday
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A slight chance of showers, then a chance of showers and thunderstorms after 11am. Patchy fog before 8am. Otherwise, partly sunny, with a high near 87. South wind 3 to 7 mph. Chance of precipitation is 30%. |
Sunday Night
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A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 71. South wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
Monday
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Showers and possibly a thunderstorm. High near 85. South southwest wind 7 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
Monday Night
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Showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Low around 68. West wind 5 to 8 mph. Chance of precipitation is 80%. |
Tuesday
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Sunny, with a high near 84. Northwest wind 6 to 8 mph. |
Tuesday Night
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Mostly clear, with a low around 65. West northwest wind around 6 mph becoming calm in the evening. |
Wednesday
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Mostly sunny, with a high near 86. Calm wind becoming west 5 to 7 mph in the afternoon. |
Wednesday Night
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Partly cloudy, with a low around 67. |
Thursday
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A 20 percent chance of showers. Mostly sunny, with a high near 87. |
Thursday Night
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A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. |
Independence Day
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A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87. |
Forecast from NOAA-NWS
for Zionsville IN.
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Weather Forecast Discussion
062
FXUS63 KIND 280707
AFDIND
Area Forecast Discussion
National Weather Service Indianapolis IN
307 AM EDT Sat Jun 28 2025
.KEY MESSAGES...
- Slightly less hot today, though still quite humid
- Scattered daily afternoon showers/t-storms through at least Monday,
isolated strong wind gusts are possible as well as localized flooding
- Drier and slightly cooler conditions expected for the middle of next week
&&
.SHORT TERM (Today and tonight)...
Issued at 307 AM EDT Sat Jun 28 2025
The presence of a weak and diffuse surface boundary, not to mention
myriad remnant outflow boundaries from recent rounds of convection,
in the background setting of a continued warm and very moist
airmass, will set the stage today for additional thunderstorms,
primarily over the southern third to half of the area near and after
peak heating.
Very weak flow throughout the depth of the troposphere will result
in slow storm motions, and minimal to no severe threat beyond the
outside shot at a localized downburst owing to the minimal shear.
Thus, the primary hazards will be the typical lightning concerns, as
well as locally heavy rainfall and isolated flash flood concerns,
given the slow storms and precipitable water values approaching 2
inches, near the top end of climatology for what is already nearing
the peak PWAT time of year as it is.
Despite the ample instability, coverage should be limited to
isolated to scattered at best with a lack of large scale forcing for
ascent or other significant forcing mechanisms beyond the
aforementioned weak boundaries.
Temperatures will still be warm, and conditions quite humid, but not
quite as oppressive as much of this week. Expect most areas to top
out mid to upper 80s, perhaps a few areas near 90, which, combined
with dewpoints largely in the upper 60s to low 70s will produce peak
heat index values in the mid 90s, about 5-10 degrees cooler than
much of the week. Lows tonight will drop back to near dewpoints in
the upper 60s to low 70s, and depending upon degree of clearing, may
set the stage for some patchy dense fog, though this will depend
heavily on amount of debris cloudiness from convective activity
later today. Winds will likely be light enough to support at least
some light fog.
&&
.LONG TERM (Sunday through Friday)...
Issued at 307 AM EDT Sat Jun 28 2025
Sunday through Monday night..
Expect elevated rain chances early in the period as a shortwave
trough and associated cold front approach. Gradually strengthening
southerly flow ahead of the system will help push deeper moisture
northward on Sunday. This combined with daytime heating should
promote scattered diurnal convection. NBM POPs appear too high
during the day given weak overall forcing so decided to lower rain
chances. Still expect rain chances around 20-40% over the north half
of central Indiana and 40-50% across the south. POPs may need to be
lowered even more in future updates depending on model trends.
Stronger dynamics from the upper wave moving in will then likely
lead to more widespread convection late Sunday night into Monday.
Deep-layer shear is weak, but a few strong storms with gusty winds
cannot be completely ruled out Monday as moderate destabilization
occurs. The system should then begin to shift east Monday night with
rain chances diminishing. Expect highs to generally be in the upper
80s to near 90F over the weekend and mid-upper 80s on Monday.
Tuesday onward...
Mostly quiet weather conditions are expected Tuesday through
Thursday as weak high pressure settles in. In addition to a drier
forecast, slightly cooler temperatures in the mid 80s are expected
Tuesday and Wednesday. Dewpoints falling into the 60s should also
feel more comfortable compared to the very humid conditions over the
past week. Ensemble guidance suggest moisture begins to stream back
into the region ahead of another system towards the end of the week.
This will lead to increasing rain chances, but increasing model
spread leads to higher uncertainty in exact timing and details.
&&
.AVIATION (06Z TAF Issuance)...
Issued at 127 AM EDT Sat Jun 28 2025
Impacts:
- Spotty MVFR conditions possible just before daybreak
- Isolated to scattered thunderstorms again Saturday, primarily south
Discussion:
Ample low level moisture in the presence of a weak boundary may
promote development of MVFR conditions, either ceilings or
visibilities, just before to near daybreak this morning. This is
fairly uncertain, and will carry SCT020 decks all but LAF, where
skies are a bit clearer, and fog may develop. Will carry a TEMPO fog
group there.
Once these conditions, if any, dissipate, expect scattered to broken
VFR cumulus, with convection potentially developing over the
southern third to half of the area. Will carry a PROB30 thunder
group at BMG, but IND/HUF may not be entirely out of the woods.
Light winds and eventually clearing skies overnight tomorrow night
may promote fog development, but this is far too uncertain for a
mention at this time.
&&
.IND WATCHES/WARNINGS/ADVISORIES...None.
&&
$$
SHORT TERM...Nield
LONG TERM...Melo
AVIATION...Nield
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