Castle Shannon, PA Weather

Allegheny County10:49 AM EDT40.36°N, 80.02°WElevation 1,027 ft

Current conditions

Haze
50°
Haze
Feels like 48°
High 68°·Low 45°
WindS 5 mph
Humidity82%
Dew point45°
Pressure30.39 inHg
Visibility4.0 mi
Cloud cover15%
Sunrise7:43 AM
Sunset6:26 PM

Observed at Pittsburgh - Allegheny County Airport · 39 min ago

Forecast

10-day

  • Monday

    Sunny, with a high near 68.

  • Monday Night

    Partly cloudy, with a low around 45.

  • Tuesday

    Mostly sunny, with a high near 65.

National Weather Service forecast updated 3 days ago.

Hourly

Hourly forecast
  1. Now Sunny 50°
  2. 11 AM Sunny 56°
  3. 12 PM Sunny 60°
  4. 1 PM Sunny 63°
  5. 2 PM Sunny 66°
  6. 3 PM Sunny 67°
  7. 4 PM Sunny 68°
  8. 5 PM Sunny 67°
  9. 6 PM Partly Cloudy 64°
  10. 7 PM Partly Cloudy 60°
  11. 8 PM Partly Cloudy 56°
  12. 9 PM Partly Cloudy 54°
  13. 10 PM Partly Cloudy 52°
  14. 11 PM Partly Cloudy 51°
  15. Tue12 AM Partly Cloudy 50°
  16. 1 AM Partly Cloudy 49°
  17. 2 AM Partly Cloudy 48°
  18. 3 AM Partly Cloudy 47°
  19. 4 AM Partly Cloudy 47°
  20. 5 AM Mostly Cloudy 46°
  21. 6 AM Partly Sunny 45°
  22. 7 AM Mostly Sunny 45°
  23. 8 AM Mostly Sunny 45°
  24. 9 AM Mostly Sunny 48°

Daily forecast

Details
  1. ThuOct 22 Sunny Sunny42°65°
  2. FriOct 23 Mostly Sunny Mostly Sunny38°63°
  3. SatOct 24 Sunny Sunny37°65°
  4. SunOct 25 Sunny Sunny40°66°
  5. TodayOct 26 Sunny Sunny45°68°
  6. TueOct 27 Mostly Sunny Mostly Sunny43°65°
  7. WedOct 28 Partly Sunny Partly Sunny46°65°
  8. ThuOct 29 Cloudy Cloudy0.03 in45°58°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
Open the National Weather Service radar (the map here needs JavaScript).

Weather news near Castle Shannon

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Air quality

179
Unhealthy
Fine particles (PM2.5)

Everyone should reduce prolonged or heavy exertion; sensitive groups should avoid it.

Forecast

  • MonModerate (70)
  • TueModerate

Mon Valley Area, PA reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:43 AM
Sunset 6:26 PM
Daylight 10 h 42 min (−2 min 28 s tomorrow)
Full Moon · 100% lit
Moonrise 6:18 PM Moonset 8:17 AM
Full moon Nov 24 New moon Nov 9

Almanac

Monthly
Normal high / low59° / 40°
Record high82° (1991)
Record low25° (1962)
Wettest0.90 in (1978)
Yesterday67° / 36°
Month to date3.36 in (normal 2.27 in)

Pittsburgh Area, records since 1875. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in PBZ, issued 3 hrs ago

What Has Changed

Update to Key Messages and Aviation Discussion.

Key Messages

1) Dry, quiet, and above-average temperatures continue through Sunday

Discussion

KEY MESSAGE 1... Confidence remains high that measurable precipitation will remain limited through Sunday as a ridge of high pressure dominates the Ohio River Valley. Persistent southwest flow aloft will support temperatures around 10 degrees above average throughout the week. The potential for frost for freeze conditions remain very low across the remaining counties where the growing season is still ongoing. However, with the November 1st cutoff approaching, the likelihood of issuing additional frost/freeze product is considered very low (less than 10%).

A cold front is expected to move across the region late tonight into early Tuesday morning. Fog may develop along or in the vicinity of the frontal boundary, primarily south of Pittsburgh near I-70 corridor.

Long-range models suggest a potential disturbance developing over the southern Great Plains this weekend and track east or northeast. However, significant run-to-run variability in the projected track continues to contribute to considerable uncertainty in rainfall amounts across the region.

Aviation

VFR favored through the TAF period with varying coverages of passing cirrus.

Light southwest to westerly afternoon winds will veer N to NE with a weak, dry frontal passage aft 00z. Hi-res modeling suggests a low probability for moisture convergence along the stalled boundary to result in fog and/or low stratus near the I-70 corridor between 10z-13z Tuesday but an increase in cirrus precluded stronger TAF mention.

Outlook... Outside of patchy morning river valley fog, high pressure will maintain high confidence in VFR conditions through at least Thursday (low probabilities for cigs return Friday with another stalled boundary) and more likely continues until an upper trough/surface cold front passage sometime after Sunday.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use. How to use Weather