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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: 1:15 pm EDT Jul 16, 2025
 
This
Afternoon
This Afternoon: Isolated showers and thunderstorms.  Mostly sunny, with a high near 84. Southwest wind around 9 mph.  Chance of precipitation is 20%.
Isolated
T-storms

Tonight

Tonight: Scattered showers and thunderstorms, mainly after 3am.  Partly cloudy, with a low around 73. Southwest wind 6 to 8 mph.  Chance of precipitation is 30%.
Scattered
T-storms

Thursday

Thursday: Scattered showers and thunderstorms.  Partly sunny, with a high near 84. West wind 8 to 10 mph.  Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Scattered
T-storms

Thursday
Night
Thursday Night: A chance of showers and thunderstorms before 5am, then a slight chance of showers.  Mostly cloudy, with a low around 65. North wind 5 to 7 mph.  Chance of precipitation is 30%.
Chance
T-storms then
Chance
Showers
Friday

Friday: A slight chance of showers, then a chance of showers and thunderstorms after 8am.  Mostly cloudy, with a high near 81. Light and variable wind becoming north northwest around 5 mph in the afternoon.  Chance of precipitation is 40%.
Chance
Showers then
Chance
T-storms
Friday
Night
Friday Night: A 40 percent chance of showers and thunderstorms, mainly after 2am.  Mostly cloudy, with a low around 69. Light and variable wind.
Chance
T-storms

Saturday

Saturday: A chance of showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 2pm, then showers and thunderstorms likely after 2pm.  Mostly cloudy, with a high near 84. West southwest wind 5 to 8 mph.  Chance of precipitation is 70%.
Showers
Likely then
T-storms
Likely
Saturday
Night
Saturday Night: Showers and thunderstorms likely, mainly before 8pm, then showers likely and possibly a thunderstorm after 2am.  Mostly cloudy, with a low around 71. West southwest wind around 6 mph.  Chance of precipitation is 60%.
T-storms
Likely then
Showers
Likely
Sunday

Sunday: Showers likely and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm.  Partly sunny, with a high near 84. West wind 5 to 7 mph.  Chance of precipitation is 60%.
Showers
Likely

Hi 84 °F Lo 73 °F Hi 84 °F Lo 65 °F Hi 81 °F Lo 69 °F Hi 84 °F Lo 71 °F Hi 84 °F

Hazardous Weather Outlook
 

This Afternoon
 
Isolated showers and thunderstorms. Mostly sunny, with a high near 84. Southwest wind around 9 mph. Chance of precipitation is 20%.
Tonight
 
Scattered showers and thunderstorms, mainly after 3am. Partly cloudy, with a low around 73. Southwest wind 6 to 8 mph. Chance of precipitation is 30%.
Thursday
 
Scattered showers and thunderstorms. Partly sunny, with a high near 84. West wind 8 to 10 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
 
A chance of showers and thunderstorms before 5am, then a slight chance of showers. Mostly cloudy, with a low around 65. North wind 5 to 7 mph. Chance of precipitation is 30%.
Friday
 
A slight chance of showers, then a chance of showers and thunderstorms after 8am. Mostly cloudy, with a high near 81. Light and variable wind becoming north northwest around 5 mph in the afternoon. Chance of precipitation is 40%.
Friday Night
 
A 40 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 69. Light and variable wind.
Saturday
 
A chance of showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 2pm, then showers and thunderstorms likely after 2pm. Mostly cloudy, with a high near 84. West southwest wind 5 to 8 mph. Chance of precipitation is 70%.
Saturday Night
 
Showers and thunderstorms likely, mainly before 8pm, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 71. West southwest wind around 6 mph. Chance of precipitation is 60%.
Sunday
 
Showers likely and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 84. West wind 5 to 7 mph. Chance of precipitation is 60%.
Sunday Night
 
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 70. North wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 60%.
Monday
 
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
Monday Night
 
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Tuesday
 
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.

 

Forecast from NOAA-NWS for Brownsburg IN.

Weather Forecast Discussion
527
FXUS63 KIND 161625
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
1225 PM EDT Wed Jul 16 2025

.KEY MESSAGES...

- Isolated strong to severe storms are possible mainly late today
  into the evening

- Seasonably warm and quite humid much of the next week, with daily
  chances for showers and storms

- Heavy rainfall and localized flooding are primary concerns

&&

.FORECAST UPDATE...
Issued at 918 AM EDT Wed Jul 16 2025

No major changes needed to the forecast this morning, but have fine-
tuned POPs through the early afternoon with current shower coverage
minimal outside of the far eastern and southeastern counties. With
temperatures in the mid 70s and dew points currently in the low 70s,
instability is minimal with no good forcing or outflow boundaries
nearby for additional initiation until later this afternoon and
evening.

Early signs from the 12Z guidance is showing little convection with
the weak frontal passage this evening, so may have to tone down the
POPs later today but will wait on the full guidance suite to
determine the strength of the forcing. Both the SPC and WPC marginal
risks look to be on the lower end of marginal with storm motions
high enough to limit the higher end flooding risk and weak
instability limiting the higher end damaging wind threat. Main
timeframe for concern for the severe threat looks to be during the
frontal passage late today into the evening if there ends up
being any strong to severe storms.

&&

.SHORT TERM (Today and tonight)...
Issued at 234 AM EDT Wed Jul 16 2025

Through Much of Today...

A series of upper impulses will move across central Indiana into the
afternoon. There won`t be much of a surface feature over central
Indiana, with perhaps a weak surface trough moving through this
morning.

Plentiful moisture will be in place with precipitable water values
continuing around 2 inches. Thus feel that the combination of the
aforementioned forcing and moisture will produce scattered to
numerous showers and thunderstorms across the area into the
afternoon.

Coverage of convection looks to be highest across the eastern
forecast area, which will have a chance to build up more instability
by early afternoon. Shear will be weak, so feel odds of a severe
storm are low during much of the today period. Heavy rain will be
the primary threat, along with some gusty subsevere winds.

Chances for rain will diminish west to east during the afternoon as
forcing from the upper energy exits.

Temperatures should still be able to reach the middle 80s to around
90 as coverage of convection diminishes this afternoon. The western
forecast area will see the warmest temperatures given more sunshine
is expected there.

Late Today into Tonight...

Thunderstorms will develop ahead of an approaching cold front west
of the area later today. Some of these may move into central Indiana
this evening. Increasing wind speeds aloft ahead of the system will
increase the shear across central Indiana. The instability and shear
will be enough for the potential of an isolated severe storm, mainly
across the western forecast area.

These initial storms should outrun the better forcing and then
weaken as the evening progresses. However, as the cold front
approaches overnight, additional convection may pop up.

Will have slight chance to chance category PoPs during the night.
Highest PoPs will be in the northwest closer to the better forcing.

Lows tonight will be in the lower 70s.

&&

.LONG TERM (Thursday through Tuesday)...
Issued at 234 AM EDT Wed Jul 16 2025

There is still a strong consensus on a typical, but moist mid
summer pattern for central Indiana late this week through the
weekend. This will likely entail daily chances for diurnally
induces scattered precipitation along with highs in the mid to upper
80s and dew points in the low 70s. Synoptically, this is being
created by strong ridging over the SE CONUS along with modest quasi-
zonal flow over the Northern Plains and Upper Great Lakes regions.

With that said, there is still going to be some slight fluctuations
day to day due to a few low level features passing through Thursday
and Friday. Per the 00Z ensemble suite, there is increasing
confidence in a low level boundary slowly pushing eastward, of which
could create a greater coverage of convection Thursday evening and
night across southern portions of the State. There is some potential
for isolated severe wind gusts, but confidence is not high. This
also may allow for slightly cooler temperatures (mid 80s) and less
storm coverage on Friday.

Uncertainty increases some for the weekend, mainly due to cascading
upstream mesoscale impacts that are not typically resolved well in
the global models. One feature we are closely monitoring for the
weekend, is the potential for weakening tropical remnants to push
northward into the Ohio Valley. Latest trends are pushing the bulk
of the forcing and moisture further south towards the Tennessee
Valley, but there are still a contingent of ensemble solutions
keeping the northern track. The track of these remnants will greatly
impact moisture levels for central Indiana, and therefor confidence
is predicated on how this evolves. Regardless, as stated previously,
a consistent summer-like airmass should remain.

&&

.AVIATION (18Z TAF Issuance)...
Issued at 1225 PM EDT Wed Jul 16 2025

Impacts:

- MVFR cigs may persist to around 19Z

- Isolated convection after 00Z, mainly near KLAF with lower chances
  at KHUF and KBMG

Discussion:

MVFR cigs should become VFR towards 18Z with a low chance of MVFR
persisting through 19Z. Shower coverage will remain minimal through
the afternoon with better chances towards LAF after 00Z. A frontal
passage may bring additional storm chances through the night but
confidence in coverage and impacts at any specific terminal is low
at this time. Winds will generally remain southwesterly through late
tonight with a gradual shift more northwesterly towards tomorrow.

&&

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

$$

UPDATE...White
SHORT TERM...50
LONG TERM...Updike
AVIATION...White
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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