Herndon, TX Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Herndon, TX in one place.
Sunny, with a high near 101. South wind 15 to 20 mph.
Local Weather Overview
This forecast page for Herndon, TX is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 14, 2026 9:17 PM CDT.
The active forecast window currently covers Sep 15 to Sep 21, 2026 for Herndon, TX.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 15 to Sep 21, 2026
- Latest sync
- Sep 14, 2026 9:17 PM CDT
- Forecast office
- SJT
- Source
- NOAA / NWS
Daily Outlook
This Week in Herndon
Tuesday looks like the warmest upcoming period in Herndon at 101 degrees F.
Sunday Night is the coolest period ahead with temperatures near 70 degrees F.
The strongest winds are forecast for Tuesday at about 15 to 20 mph S.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 14, 2026 9:17 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- SJT
- Radar station
- KDYX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Clear, with a low around 76. South wind around 15 mph.
Sunny, with a high near 100. South southeast wind 10 to 15 mph.
Mostly clear, with a low around 76. South southeast wind 10 to 15 mph.
Sunny, with a high near 98. South southeast wind around 10 mph.
Mostly clear, with a low around 75. South southeast wind 10 to 15 mph.
Sunny, with a high near 96. South wind around 10 mph.
Mostly clear, with a low around 74. South southeast wind 10 to 15 mph.
A slight chance of rain showers after 1pm. Sunny, with a high near 97. South wind around 10 mph. Chance of precipitation is 20%.
A chance of rain showers. Partly cloudy, with a low around 74. Chance of precipitation is 40%.
A chance of rain showers. Mostly sunny, with a high near 93. Chance of precipitation is 40%.
A chance of rain showers before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 50%.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Sep 15
|
Sunny
|
101°F |
15 to 20 mph
S
|
|
Tuesday Night
Sep 15
|
Clear
|
76°F |
15 mph
S
|
|
Wednesday
Sep 16
|
Sunny
|
100°F |
10 to 15 mph
SSE
|
|
Wednesday Night
Sep 16
|
Mostly Clear
|
76°F |
10 to 15 mph
SSE
|
|
Thursday
Sep 17
|
Sunny
|
98°F |
10 mph
SSE
|
|
Thursday Night
Sep 17
|
Mostly Clear
|
75°F |
10 to 15 mph
SSE
|
|
Friday
Sep 18
|
Sunny
|
96°F |
10 mph
S
|
|
Friday Night
Sep 18
|
Mostly Clear
|
74°F |
10 to 15 mph
SSE
|
|
Saturday
Sep 19
|
Sunny then Slight Chance Rain Showers
|
97°F |
10 mph
S
|
|
Saturday Night
Sep 19
|
Chance Rain Showers
|
74°F |
10 mph
S
|
|
Sunday
Sep 20
|
Chance Rain Showers
|
93°F |
10 mph
S
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
70°F |
5 to 10 mph
E
|
|
Monday
Sep 21
|
Chance Rain Showers
|
86°F |
5 to 10 mph
NNE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Herndon.