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Frederick, Maryland 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Frederick MD
National Weather Service Forecast for: Frederick MD
Issued by: National Weather Service Baltimore, MD/Washington, D.C.
Updated: 11:51 pm EDT Jul 26, 2025
 
Overnight

Overnight: Scattered showers and thunderstorms, mainly before 3am.  Patchy fog before 2am.  Otherwise, mostly cloudy, with a low around 75. Calm wind.  Chance of precipitation is 40%.
Scattered
T-storms and
Patchy Fog
Sunday

Sunday: Showers and thunderstorms likely, mainly between 3pm and 5pm, then showers likely and possibly a thunderstorm after 5pm.  Partly sunny, with a high near 92. Heat index values as high as 105. Calm wind becoming west around 6 mph in the afternoon.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Slight Chance
Showers then
T-storms
Likely
Sunday
Night
Sunday Night: A chance of showers and thunderstorms, mainly before 11pm.  Mostly cloudy, then gradually becoming mostly clear, with a low around 76. Calm wind.  Chance of precipitation is 30%.
Chance
T-storms then
Partly Cloudy
Monday

Monday: Sunny, with a high near 94. Heat index values as high as 102. Calm wind.
Sunny

Monday
Night
Monday Night: Mostly clear, with a low around 74. Calm wind.
Mostly Clear

Tuesday

Tuesday: Sunny and hot, with a high near 98.
Hot

Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 76.
Partly Cloudy

Wednesday

Wednesday: Mostly sunny and hot, with a high near 99.
Hot

Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am.  Mostly cloudy, with a low around 75. Chance of precipitation is 40%.
Chance
T-storms

Lo 75 °F Hi 92 °F Lo 76 °F Hi 94 °F Lo 74 °F Hi 98 °F Lo 76 °F Hi 99 °F Lo 75 °F

 

Overnight
 
Scattered showers and thunderstorms, mainly before 3am. Patchy fog before 2am. Otherwise, mostly cloudy, with a low around 75. Calm wind. Chance of precipitation is 40%.
Sunday
 
Showers and thunderstorms likely, mainly between 3pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Partly sunny, with a high near 92. Heat index values as high as 105. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
 
A chance of showers and thunderstorms, mainly before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 76. Calm wind. Chance of precipitation is 30%.
Monday
 
Sunny, with a high near 94. Heat index values as high as 102. Calm wind.
Monday Night
 
Mostly clear, with a low around 74. Calm wind.
Tuesday
 
Sunny and hot, with a high near 98.
Tuesday Night
 
Partly cloudy, with a low around 76.
Wednesday
 
Mostly sunny and hot, with a high near 99.
Wednesday Night
 
A chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 75. Chance of precipitation is 40%.
Thursday
 
A chance of showers 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 88. Chance of precipitation is 60%.
Thursday Night
 
Showers likely. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Friday
 
Partly sunny, with a high near 81.
Friday Night
 
Partly cloudy, with a low around 62.
Saturday
 
Mostly sunny, with a high near 82.

 

Forecast from NOAA-NWS for Frederick MD.

Weather Forecast Discussion
992
FXUS61 KLWX 270138 AAA
AFDLWX

Area Forecast Discussion...UPDATED
National Weather Service Baltimore MD/Washington DC
938 PM EDT Sat Jul 26 2025

.SYNOPSIS...
A front will stall over the forecast area before lifting north as a
warm front Sunday evening. A warm and humid airmass will yield daily
shower and thunderstorm chances through midweek, ahead of a cold
front bringing cooler temperatures by the end of the week.

&&

.NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...

Things will continue to quiet down tonight, however, isolated
showers will still remain possible along the Pennsylvania border
and over the Appalachian Mountains. Overnight, short-term models
indicate the potential for low clouds to form east of I-83 and
I-95.


&&

.SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY NIGHT/...
A hot and humid airmass remains overhead Sunday and Monday, yielding
daily shower and thunderstorm chances. A front lifts north of the
forecast area on Sunday, bringing widespread shower and thunderstorm
chances. With plenty of instability, storms will be capable of
becoming strong to severe with the primary hazard type being
damaging wind gusts. High temperatures will be in the upper 80s to
low 90s with heat indices 100-105 expected at lower elevations.
A Heat Advisory is in effect for portions of the I-95 corridor
eastward from noon to 8PM Sunday. Overnight low temperatures
will be in the 70s for most with higher elevations dipping into
the 60s.

Weak surface high pressure builds to the south on Monday with shower
and thunderstorm chances continuing with a hot and humid airmass in
place. Coverage of showers and thunderstorms will be lower compared
to Sunday, with precipitation chances largely confined to along and
west of the Blue Ridge. High temperatures will be in the 90s for
most with higher elevations staying in the 80s. Heat index values of
100-105 are expected at lower elevations.

&&

.LONG TERM /TUESDAY THROUGH SATURDAY/...
High pressure/weak gradients will remain across the area Tuesday
while the large upper ridge remains centered to the southwest.
Forcing will be nebulous, so thunderstorm chances appear to be
relatively lower and focused on the diurnal terrain circulations.
However, we will be in northwest flow aloft around the ridge, so
will have to be mindful of any remnant MCVs that could provide an
extra source of lift. Heat will build further with the hottest
conditions of the week expected Tuesday and Wednesday. Highs return
solidly to the mid 90s with perhaps upper 90s. Drier air aloft may
allow dew points to mix down a little, but heat index values will
still likely top out in the 100-110 range across much of the area.

A strong cold front will approach Wednesday into Thursday, though
the timing is currently uncertain. Recent trends favor it dropping
into the area Wednesday night or early Thursday. However, if forcing
can align with peak heating, we`ll have to monitor for the potential
of stronger thunderstorms. Cooler (below normal temperatures) and
drier air continue to push into the area Friday. However, can`t
remove rain chances entirely as some guidance indicates low pressure
moving along the front to our south, spreading some showers into
southern parts of the area. Saturday is more likely to remain dry,
with dew points continuing to drop into the 50s.

&&

.AVIATION /02Z SUNDAY THROUGH THURSDAY/...


Low clouds develop across the area overnight, with MVFR to IFR
conditions possible. Showers and thunderstorm chances continue on
Sunday as the front lifts north as a warm front. Coverage of storms
will be greater with similar threats to today. Showers and
thunderstorms remain possible Monday, mainly at KMRB and KCHO.
Otherwise, prevailing VFR conditions expected both days. Winds shift
to southwesterly Sunday, blowing 5 to 10 knots in the afternoon. On
Monday, winds shift to northerly, blowing around 5 knots.

VFR conditions should prevail Tuesday and most of Wednesday.
Thunderstorm coverage will likely be a minimum Tuesday under high
pressure...highest chances near the mountains. By Wednesday, a
strong cold front will approach which could result in greater
coverage, especially late in the day and continuing Thursday.

&&

.MARINE...
Daily shower and thunderstorm chances may lead to hazardous
conditions over the waters each afternoon through this weekend. SMWs
may be needed if storms become strong to severe over the waters.
Showers and thunderstorms are expected to stay well west of the
waters on Monday, with no marine hazards expected that day.
Otherwise, winds remain below SCA each day.

High pressure Tuesday into Wednesday will result in light gradient
winds. At this time, thunderstorm coverage is forecast to be more
isolated Tuesday. Coverage of thunderstorms may increase late
Wednesday or Thursday as a cold front moves into the area.

&&

.TIDES/COASTAL FLOODING...
Tides will be on the gradual rise throughout the weekend with
sensitive tidal locations reaching Action Stage during the high
tide cycle.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...Heat Advisory from noon to 8 PM EDT Sunday for DCZ001.
MD...Heat Advisory from noon to 8 PM EDT Sunday for MDZ013-016>018.
VA...Heat Advisory from noon to 8 PM EDT Sunday for VAZ037>039-050-
     051-053>057-502-527.
WV...None.
MARINE...None.

&&

$$

SYNOPSIS...LFR
NEAR TERM...LFR
SHORT TERM...AVS
LONG TERM...ADS
AVIATION...ADS/LFR
MARINE...ADS/LFR
TIDES/COASTAL FLOODING...LFR
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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