Mechanicsburg, PA Weather

Cumberland County7:21 PM EDT40.21°N, 77.01°WElevation 433 ft

Current conditions

Mostly Clear
58°
Mostly Clear
Feels like 58°
High 69° Monday·Low 42° tonight
WindS 1 mph
Humidity75%
Dew point50°
Cloud cover7%
Sunrise7:30 AM
Sunset6:15 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Sunday Night

    Mostly clear, with a low around 42.

  • Monday

    Mostly sunny, with a high near 69.

  • Monday Night

    Partly cloudy, with a low around 47.

National Weather Service forecast updated 4 days ago.

Hourly

Hourly forecast
  1. Now Mostly Clear 58°
  2. 8 PM Mostly Clear 54°
  3. 9 PM Mostly Clear 52°
  4. 10 PM Mostly Clear 50°
  5. 11 PM Mostly Clear 48°
  6. Mon12 AM Mostly Clear 47°
  7. 1 AM Mostly Clear 46°
  8. 2 AM Mostly Clear 45°
  9. 3 AM Mostly Clear 44°
  10. 4 AM Mostly Clear 43°
  11. 5 AM Mostly Clear 43°
  12. 6 AM Sunny 42°
  13. 7 AM Sunny 42°
  14. 8 AM Mostly Sunny 43°
  15. 9 AM Mostly Sunny 46°
  16. 10 AM Mostly Sunny 51°
  17. 11 AM Mostly Sunny 56°
  18. 12 PM Mostly Sunny 60°
  19. 1 PM Mostly Sunny 64°
  20. 2 PM Mostly Sunny 67°
  21. 3 PM Mostly Sunny 69°
  22. 4 PM Mostly Sunny 69°
  23. 5 PM Mostly Sunny 68°
  24. 6 PM Partly Cloudy 66°

10-day forecast

Details
  1. TonightOct 20 Clear Clear42°
  2. WedOct 21 Sunny Sunny37°66°
  3. ThuOct 22 Sunny Sunny38°67°
  4. FriOct 23 Sunny Sunny35°60°
  5. SatOct 24 Patchy Frost then Sunny Patchy Frost then Sunny37°60°
  6. TodayOct 25 Sunny Sunny42°65°
  7. MonOct 26 Mostly Sunny Mostly Sunny47°69°
  8. TueOct 27 Mostly Sunny Mostly Sunny63°
  9. WedOct 28 Cloudy Cloudy47°60°
  10. ThuOct 29 Sunny Sunny42°55°

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

Radar

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Weather news in Pennsylvania

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Air quality

38
Good
Fine particles (PM2.5)

Air quality is satisfactory, and air pollution poses little or no risk.

Forecast

  • SunModerate (75)
  • MonModerate (53)
  • TueGood

Susquehanna Valley, 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 7:30 AM
Sunset 6:15 PM
Daylight 10 h 45 min (−2 min 26 s tomorrow)
Full Moon · 100% lit
Moonrise 5:35 PM Moonset 6:52 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low62° / 42°
Record high76° (2021)
Record low28° (1962)
Wettest2.19 in (1980)
Month to date3.23 in (normal 3.06 in)

Middletown-Harrisburg Area, records since 1888. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in CTP, issued 31 min ago

What Has Changed

* No significant changes

Key Messages

1) Rain-free conditions will persist through the end of October

Discussion

KEY MESSAGE 1: Rain-free conditions will persist through the end of October

A large area of high pressure will remain in place over the Northeast U.S. and Central Appalachians. Expect mainly clear skies and rain-free conditions right through the upcoming week.

Fog is a tough call for tonight. HREF and REFS probabilities are highest around LNS and over the NW mtns. However, clouds moving in from the NW could keep the NW from getting too foggy. The best bets are the same places as have been the last few nights (W Br Susq and Susq above Harrisburg, and Lake Raystown). Have mentioned patchy fog in many places due to the uncertainty, but kept dense fog mention to IPT/LNS.

Moderate variations will occur in daily and nocturnal temperatures as at least one weak, dry cold fronts move SE across the Commonwealth during the upcoming 5-6 days. Wind direction/speed and cloud cover will also show some minor day- day variations.

The first of the aforementioned dry cold fronts will slip SE across the CWA Monday night into early Tuesday, but with only limited moisture to work with, just some periods of BKN, shallow strato cu and cirrus will occur with no rainfall expected beyond a few sprinkles over the Northern Mtns Monday night. Have kept the PoPs below mentionable for now on Mon night. This front seems like it may slide in before it makes low clouds in the nrn tier.

After a brief shot of seasonably cool air Tuesday and Wed (directed mainly at the NE half of the state), a late week/Saturday rebound in temps (to well above normal values in the low-mid 60s across the Mtns and upper 60s to mid 70s in the Central and Southern Valleys) will follow. A second, weak frontal boundary could brush by across the Northern tier counties Friday afternoon and night. New Day8 is wet (40-60 PoPs) as the pattern shifts to a more-zonal flow for the east. GFS is still dry, though. Models/members are not in as good of agreement from then onward.

Aviation

Bright moonlight skies and light winds will prevail overnight, as high pressure remains over the area. A few high clouds, mainly at BFD.

As was the case last night, a very strong inversion could result in some fog and lower clouds late, even with the very dry air. Overall I did not change much from the 18Z TAF package for overnight.

More detail below.

The greatest chances for fog and lower CIGS are at IPT, MDT, and LNS, given weaker flow down there, closer to the high center.

Outlook...

Mon-Fri...VFR prevailing conditions.

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