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Lafayette, Indiana 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Lafayette IN
National Weather Service Forecast for:
Lafayette IN
Issued by: National Weather Service Indianapolis, IN |
| Updated: 2:15 am EDT Jul 2, 2026 |
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Overnight
 Clear
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Thursday
 Hot
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Thursday Night
 Mostly Clear
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Friday
 Slight Chance Showers then Slight Chance T-storms
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Friday Night
 Chance T-storms
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Independence Day
 Chance T-storms then Showers
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Saturday Night
 Showers
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Sunday
 Showers Likely then Chance T-storms
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Sunday Night
 Chance T-storms
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| Lo 74 °F |
Hi 92 °F |
Lo 75 °F |
Hi 92 °F |
Lo 73 °F |
Hi 90 °F |
Lo 71 °F |
Hi 86 °F |
Lo 66 °F |
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Extreme Heat Warning
Overnight
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Clear, with a low around 74. Light southwest wind. |
Thursday
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Sunny and hot, with a high near 92. Heat index values as high as 106. Southwest wind 5 to 8 mph. |
Thursday Night
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Mostly clear, with a low around 75. Southwest wind around 5 mph becoming calm in the evening. |
Friday
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A slight chance of showers before noon, then a slight chance of showers and thunderstorms between noon and 1pm. Sunny and hot, with a high near 92. Heat index values as high as 105. Southwest wind 3 to 7 mph. Chance of precipitation is 20%. |
Friday Night
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A 50 percent chance of showers and thunderstorms, mainly after 7pm. Partly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm in the evening. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
Independence Day
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A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. High near 90. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
Saturday Night
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Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then showers likely and possibly a thunderstorm after 2am. Low around 71. Light south southwest wind. Chance of precipitation is 80%. |
Sunday
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Showers likely before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 86. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 60%. |
Sunday Night
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A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 66. Northwest wind around 5 mph becoming calm in the evening. |
Monday
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A slight chance of showers between 8am and 2pm, then a slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 84. Calm wind becoming north northwest around 5 mph in the afternoon. Chance of precipitation is 20%. |
Monday Night
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A slight chance of thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 10%. |
Tuesday
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A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. |
Tuesday Night
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A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. |
Wednesday
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A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. |
Forecast from NOAA-NWS
for Lafayette IN.
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Weather Forecast Discussion
423
FXUS63 KIND 020539
AFDIND
Area Forecast Discussion
National Weather Service Indianapolis IN
139 AM EDT Thu Jul 2 2026
.KEY MESSAGES...
- Heat index values between 105 to 110 daily through Friday
- Extreme Heat Warning in effect through Friday evening
- Thunderstorm chances will increase Friday through the holiday
weekend
&&
.DISCUSSION (Today through Wednesday)...
Issued at 138 AM EDT Thu Jul 2 2026
Overview.
An intense heat wave will peak across central Indiana through
Friday, maintaining dangerously hot and humid conditions with
afternoon heat index values pushing up to 110 degrees. The upper-
level ridge will begin to suppress southward this weekend, allowing
a transition to a more active, convective pattern with daily chances
for scattered showers and thunderstorms alongside a gradual cooling
trend into next week.
Today through Friday night.
The synoptic pattern through the end of the work week will be
characterized by the persistence of a robust, highly anomalous 594
dm sub-tropical ridge centered over the Ohio Valley. Intense large-
scale subsidence and strong mid-level thermal capping manifested by
700 mb temperatures remaining between +12C and +14C will continue to
inhibit deep vertical moist convection through Thursday and much of
Friday. A persistent low-level southwesterly wind component will
maintain a steady tap into rich Gulf moisture, anchoring surface dew
points in the mid to upper 70s across the forecast area. When
combined with strong diabatic solar heating, maximum afternoon
ambient temperatures in the low to mid 90s will yield dangerous peak
heat index values ranging from 105 to 110 degrees.
Consequently, Excessive Heat Warnings remain in effect through
Friday evening. By late Friday afternoon, subtle height falls on the
northern periphery of the retreating ridge axis, combined with
intense boundary layer destabilization, may support isolated
convective initiation along localized mesoscale boundaries, though
widespread storm development will remain heavily suppressed by the
lingering cap.
Saturday through Wednesday.
Medium-range and ensemble guidance show a transition in the upper-
level pattern beginning Saturday as the sub-tropical ridge
deamplifies and suppresses further into the Deep South. In its wake,
a progressive northwest flow regime will establish itself across the
Great Lakes and Ohio Valley. This transition will open the door for
a series of migratory mid-level shortwave troughs and embedded
convective impulses to traverse central Indiana, interacting with an
unseasonably moist and unstable airmass. Precipitable water values
hovering near or above 2.0 inches will fuel high afternoon CAPE
values each day from Saturday through Monday.
Given the lack of robust deep-layer vertical wind shear, the primary
convective mode through the weekend will favor pulse-type storms or
loosely organized multicell clusters capable of producing localized
downbursts and torrential rainfall rates. By Tuesday into Wednesday,
long-range guidance depicts a more potent northern stream shortwave
digging out of south-central Canada into the Great Lakes region,
propelling a surface cold front across the state. This boundary will
provide a focus for more organized convective development before
introducing a much cooler, drier Canadian airmass. Significant cold
air advection in the wake of the front will finally suppress
temperatures back to near or slightly below seasonal levels by the
conclusion of the forecast period.
&&
.AVIATION (06Z TAF Issuance)...
Issued at 138 AM EDT Thu Jul 2 2026
Impacts:
- Chance of brief MVFR/IFR vsbys in patchy fog within 09Z-12Z this
morning
Discussion:
VFR conditions expected through the TAF period outside of patchy fog
from 09Z to 12Z with winds near calm and dewpoint depressions near
zero. Mostly clear skies expected through the remainder of the TAF
period after fog dissipates with diurnally driven cu looking a bit
more widespread today compared to yesterday. Winds will generally be
southerly at 7-12kts through tonight outside of the near calm winds
this morning.
&&
.IND WATCHES/WARNINGS/ADVISORIES...
Extreme Heat Warning until 8 PM EDT Friday for INZ021-028>031-
035>049-051>057-060>065-067>072.
&&
$$
AVIATION...White
DISCUSSION...White
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