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Brownsburg, Indiana 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Brownsburg IN
National Weather Service Forecast for: Brownsburg IN
Issued by: National Weather Service Indianapolis, IN
Updated: 6:52 pm EDT Jul 2, 2025
 
Tonight

Tonight: Partly cloudy, with a low around 68. West northwest wind around 6 mph becoming calm  in the evening.
Partly Cloudy

Thursday

Thursday: A 20 percent chance of showers and thunderstorms after 3pm.  Sunny, with a high near 87. West northwest wind 3 to 6 mph.
Sunny then
Slight Chance
T-storms
Thursday
Night
Thursday Night: A 20 percent chance of showers and thunderstorms before 8pm.  Mostly clear, with a low around 70. Light west southwest wind.
Slight Chance
T-storms then
Mostly Clear
Independence
Day
Independence Day: Mostly sunny, with a high near 89. Calm wind becoming southwest around 5 mph in the afternoon.
Mostly Sunny

Friday
Night
Friday Night: Mostly clear, with a low around 71. South wind around 5 mph becoming calm  in the evening.
Mostly Clear

Saturday

Saturday: Sunny and hot, with a high near 91. South southwest wind 5 to 8 mph.
Hot

Saturday
Night
Saturday Night: Partly cloudy, with a low around 72. South wind around 6 mph.
Partly Cloudy

Sunday

Sunday: A 30 percent chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 90. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Mostly Sunny
then Chance
T-storms
Sunday
Night
Sunday Night: A 40 percent chance of showers and thunderstorms.  Partly cloudy, with a low around 69. West southwest wind 5 to 7 mph.
Chance
T-storms
Lo 68 °F Hi 87 °F Lo 70 °F Hi 89 °F Lo 71 °F Hi 91 °F Lo 72 °F Hi 90 °F Lo 69 °F

 

Tonight
 
Partly cloudy, with a low around 68. West northwest wind around 6 mph becoming calm in the evening.
Thursday
 
A 20 percent chance of showers and thunderstorms after 3pm. Sunny, with a high near 87. West northwest wind 3 to 6 mph.
Thursday Night
 
A 20 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 70. Light west southwest wind.
Independence Day
 
Mostly sunny, with a high near 89. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
 
Mostly clear, with a low around 71. South wind around 5 mph becoming calm in the evening.
Saturday
 
Sunny and hot, with a high near 91. South southwest wind 5 to 8 mph.
Saturday Night
 
Partly cloudy, with a low around 72. South wind around 6 mph.
Sunday
 
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Sunday Night
 
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. West southwest wind 5 to 7 mph.
Monday
 
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. West wind 5 to 8 mph.
Monday Night
 
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Tuesday
 
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
Tuesday Night
 
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Wednesday
 
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Brownsburg IN.

Weather Forecast Discussion
373
FXUS63 KIND 021846
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
246 PM EDT Wed Jul 2 2025

.KEY MESSAGES...

- Warming trend back to the low 90s.

- Heat indices approaching 100 degrees this weekend.

- Scattered showers and thunderstorms return to the forecast
Sunday.

&&

.SHORT TERM (This evening through Thursday)...
Issued at 246 PM EDT Wed Jul 2 2025

An MCV over the western corn belt will continue to move SE towards
Central Indiana through tonight.  Despite the presence of residual
instability and a moderate cumulus field across the area, strong
capping inversion centered near 700mb seen on the 12Z ILX sounding
will prevent any form of convective initiation the remainder of the
afternoon. There however is a zone of weak mid level instability and
sufficient lift associated with the MCV for some sprinkles to
develop across central Indiana overnight as the MCV transits the
area. For the time being have opted to keep pops around 10 percent,
low enough for no mention in the zones. Temperatures tonight look to
be near seasonal norms in the mid-upper 60s.

For tomorrow, greater instability and increasing WAA/moisture
convergence ahead of building upper level ridge may support isolated
to widely scattered TS under otherwise partly cloudy skies. Model
guidance is in disagreement with the best placement and coverage, so
for now just going with broad brush 20 pops. Highs look to range
from the mid 80s to near 90F.

&&

.LONG TERM (Thursday night through Wednesday)...
Issued at 246 PM EDT Wed Jul 2 2025

More typical summertime weather is expected from Friday through
Wednesday.

Friday through Sunday Morning....

Models suggest strong ridging aloft over the Plains states to slowly
pass to the the eastern Great Lakes by Saturday Night. This familiar
pattern will keep central Indiana protected from forcing dynamics as
they are steered well to the north. Meanwhile strong surface high
pressure is expected to set up across the east coast. This will
allow for a return of hot and humid air to Indiana and the Ohio
Valley through the weekend, returning daily high temperatures into
the 90s with uncomfortable heat index values.

Diurnal heating through the day may lead to the development of an
isolated shower or storm, but confidence for this during these
afternoons is low. Forecast soundings show thin CAPE values on
Friday and Saturday. Thus expect the NBM may include some slight
chance pops on Friday and Saturday afternoons, but most spots should
remain dry.

Sunday Afternoon through Monday...

Better chances will be in place on Sunday, but again, coverage
should be just a bit better due to the greater instability.
Significantly better CAPE on Sunday afternoon, near 2000 J/KG.
Furthermore, the models have been trending toward a short wave and an
associated cold front passing across Indiana as the ridge and high
pressure departs. This forcing along with the hot and humid air mass
across the area results in high confidence for showers and storms on
Sunday and Sunday night. Here, expect the best chances for rain over
the next 7 days with this system.

The frontal boundary will be lingering over Indiana on Monday. This
will result in continued chances for showers and storms,
particularly across southern and eastern parts of Central Indiana.

Tuesday through Wednesday...

Weak ridging across the area is expected to return to Indiana and
the Great Lakes by Tuesday.  Surface high pressure in place across
the east coast will once again allow for a southerly flow of warm
and humid air to reside over Central Indiana. This will result in
highs at or above seasonal normals in the upper 80s to around 90,
and lows around 70. Given the high dew points and heating but no
organized forcing, a diurnal shower or storm may be possible, but
confidence is low and most locations will remain dry.

&&

.AVIATION (18Z TAF Issuance)...
Issued at 1153 AM EDT Wed Jul 2 2025

Impacts:

- None

Discussion:

VFR conditions are expected through the TAF period as high pressure
will be the dominant weather influence over the region. Satellite
imagery shows clear skies this afternoon with wispy CI found across
Central Indiana. Convective temperatures being reached is allowing
some sct CU development. All of these clouds will be at VFR heights.

Clouds and winds will diminish this evening and overnight as heating
is lost. VFR will continue.


&&

.IND WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

SHORT TERM...Crosbie
LONG TERM...Puma
AVIATION...Puma
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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