Oshkosh, Wisconsin 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Oshkosh WI
National Weather Service Forecast for:
Oshkosh WI
Issued by: National Weather Service Green Bay, WI |
Updated: 3:52 pm CDT Jun 26, 2025 |
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This Afternoon
 Chance Showers
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Tonight
 Heavy Rain and Patchy Fog
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Friday
 Patchy Fog then Partly Sunny
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Friday Night
 Partly Cloudy
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Saturday
 Mostly Sunny
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Saturday Night
 Slight Chance T-storms
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Sunday
 Slight Chance T-storms then Showers Likely
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Sunday Night
 Chance T-storms
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Monday
 Slight Chance Showers then Slight Chance T-storms
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Hi 73 °F |
Lo 66 °F |
Hi 73 °F |
Lo 61 °F |
Hi 78 °F |
Lo 68 °F |
Hi 82 °F |
Lo 69 °F |
Hi 81 °F |
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Hazardous Weather Outlook
Flood Watch
This Afternoon
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A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly cloudy, with a high near 73. East northeast wind around 11 mph. |
Tonight
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Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Some of the storms could produce heavy rainfall. Patchy fog after 9pm. Low around 66. East wind 8 to 11 mph becoming south southwest after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible. |
Friday
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Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 73. West wind 11 to 14 mph, with gusts as high as 21 mph. |
Friday Night
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Partly cloudy, with a low around 61. Northwest wind 6 to 11 mph, with gusts as high as 18 mph. |
Saturday
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Mostly sunny, with a high near 78. Calm wind becoming southwest around 6 mph in the afternoon. |
Saturday Night
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A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68. |
Sunday
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A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 82. Chance of precipitation is 60%. |
Sunday Night
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A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 69. Chance of precipitation is 40%. |
Monday
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A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 81. Chance of precipitation is 20%. |
Monday Night
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Mostly clear, with a low around 65. |
Tuesday
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Sunny, with a high near 79. |
Tuesday Night
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Mostly clear, with a low around 64. |
Wednesday
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A 20 percent chance of showers. Sunny, with a high near 78. |
Wednesday Night
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A 20 percent chance of showers. Partly cloudy, with a low around 64. |
Thursday
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A 30 percent chance of showers. Mostly sunny, with a high near 77. |
Forecast from NOAA-NWS
for Oshkosh WI.
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Weather Forecast Discussion
439
FXUS63 KGRB 261959
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
259 PM CDT Thu Jun 26 2025
Forecast discussion for routine afternoon forecast issuance
.KEY MESSAGES...
- There is a slight risk of severe thunderstorms in central Wisconsin
and the southern Fox Valley late this afternoon and evening.
Damaging winds and a few tornadoes are possible. The greatest
threat is expected southwest of a line from Marshfield to
Oshkosh. Severe weather will be most likely between 4 pm and 10
pm.
- A Flood Watch has been issued for central Wisconsin and the
southern Fox Valley, where soils are already saturated and
additional rainfall amounts of 1.5 to 3 inches are expected.
Areas with greatest flood potential include low-lying and urban
areas, though localized river flooding may also occur.
- Near/below temperatures continue through Friday, then increasing
heat and humidity into the weekend, with highs near 90 by
Sunday.
- There is a chance of strong to severe storms late this weekend,
especially Sunday afternoon and evening.
&&
.DISCUSSION...
Issued at 259 PM CDT Thu Jun 26 2025
Forecast concerns include severe weather and flooding potential
through this evening, and another couple rounds of strong to
severe storms from Saturday night through Sunday evening.
Heavy Rainfall/Flooding Concerns: Will continue the Flood Watch
for Wood, Portage, Waupaca, Waushara and Winnebago counties from
4 pm today through 4 am Friday. Much of this area has received
1.5 to 3 inches of rain since Monday, so soils are saturated. A
west to east line of storms extending from KLSE-KDLL-KUNU will
continue to lift north into our southern counties between 4-5 pm,
followed by a well-developed squall line crossing central and east
central WI from 6-10 pm. Both of these lines will be capable of
producing torrential rainfall, given PWATs approaching 2 inches,
and enough elevated instability to support higher rainfall rates
with convection. The end time of the watch is likely longer than
it needs to be, as most of the heavier rain will be gone by late
evening, but wanted to match the end time of ARX`s Flood Watch to
our southwest.
Severe Weather Threat Through This Evening: Most models keep the
warm front and associated surface based instability south of the
forecast area late this afternoon/evening, but given the close
proximity of the front (shallow stable layer near the surface),
MUCAPE of 500-1000 j/kg, deep layer shear of 40-45 kts, 0-3 km
SRH of 200-300 m2/s2, there is potential for supercells with
damaging winds and a few tornadoes, especially in our far
southwest counties. CAMs show development starting in our far
southwest by 4-5 pm. A squall line will also move through C/EC
from west to east between 6 and 10 pm, with potential for sporadic
strong to damaging gusts.
Rest of the Forecast: Quieter conditions expected friday and
Saturday, with warmer temperatures in the 80s arriving for the
weekend. A weak cold front is expected to approach the region
Saturday night, then move through on Sunday and Sunday night, and
this should bring a good chance of storms. With SBCAPE rising to
2-4k j/kg on Sunday, there is ample instability to support severe
storms. However, deep layer shear is on the weak side; around
20-25 knots. Drier and more comfortable condiitons are expected
for much of the following work week.
&&
.AVIATION...for 18Z TAF Issuance
Issued at 1248 PM CDT Thu Jun 26 2025
Widespread IFR/MVFR stratus covered the forecast at issuance time.
Showers and embedded storms were approaching from MN, and these
will impact our area during the late afternoon and evening.
Slight improvement (rising ceilings) will be observed at the TAF
sites for the next couple hours, in advance of the rain. Once the
steady moderate to heavy rain arrives, expect IFR conditions to
expand. After the rain tapers off later tonight, areas of fog and
very low stratus (LIFR/local VLIFR) will become more widespread.
Increasing west winds Friday morning will cause ceilings to
gradually rise to MVFR by midday.
Have added thunderstorms to all TAF sites this evening, with the
exception of RHI. Torrential rainfall and gusty winds may
accompany any storms.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
Flood Watch through late tonight for WIZ035>037-045-048.
&&
$$
DISCUSSION.....Kieckbusch
AVIATION.......Kieckbusch
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