Weather StoryAlmanac, microseasons, and the day's weather story.

Harrisburg, Pennsylvania Weather

Night falls a minute earlier. Day 43 of summer. Read this microseason across nine climate regions →

Harrisburg weather forecast — hour by hour, 7-day outlook, NOAA radar

Harrisburg, PA
Sunday, August 2 at 11:00 AM
79
°
Overcast
Feels like
83°
Humidity
74%
Wind
9 mph
Sunrise
2:06 AM
Sunset
4:20 PM
Harrisburg, PA
Hour by hour · 24h
24-Hour ForecastHarrisburg, PA: 24-hour forecast. Temperatures range from 73 to 81 degrees Fahrenheit with a 57% chance of precipitation at 6 PM.
L 73°H 81°
Harrisburg, PA
7-day forecast
  1. Today
    Aug 2
    Showers
    57%
    0.81″
    81°74°—
  2. Monday
    Aug 3
    Overcast
    37%
    —
    84°72°+3°
  3. Tuesday
    Aug 4
    Overcast
    10%
    —
    83°65°-1°
  4. Wednesday
    Aug 5
    Thunderstorm
    37%
    —
    85°64°+2°
  5. Thursday
    Aug 6
    Light Drizzle
    60%
    —
    89°72°+4°
  6. Friday
    Aug 7
    Heavy Drizzle
    58%
    0.05″
    94°71°+5°
  7. Saturday
    Aug 8
    Light Drizzle
    47%
    —
    94°70°0°
Harrisburg, PA
Next 24 hours · Mild now
70°77°83°12p6p12a6anow 79°high 81°low 73°PRECIP %
Harrisburg, PA
Anemometer · 24h winds · from true
NESW
From · True
SE
143° · steady
Direction
SE
143°
Sustained
9
mph
Gust
20
mph
Peak 24h
30
avg 7 mph
Beaufort · 3 · GENTLE BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 7 mph · pk 30 mph @ 11:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 215SUSTGUST
−24h−18h−12h−6hnow
Light breeze holding from the se.
Harrisburg, PA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1000.2
+0.8 mb in 3h · rising · 29.54 inHg
Now
1000.2
mb
3h
+0.8
mb
12h
+0.1
mb
24h
-1.6
mb
Regime · RAIN
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 999–1002
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1001.8999.01000.2
Damp, unsettled regime — wet weather lingers nearby.
Harrisburg, PA
Air quality
52
AQI
Moderate
→-2 in 6h

AQI 52 (Moderate), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 48. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5Good
8.2μg/m³
PM 10Good
11μg/m³
NO₂Good
2μg/m³
OzoneDRIVERUnhealthy SG
102μg/m³
UV IndexHigh
5.1

What's driving it

Ozone × UV × Sky

Ozone at AQI 48. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.

Present
AQI 48
UV peak
5.9 at 1 PM
Sky at peak
overcast
Projected peak
AQI 19

PM × Wind × Precip

PM scrubbed by 2 hours of recent rain — PM2.5 down to 8.2 µg/m³, PM10 to 10.7 µg/m³.

PM2.5/PM10
0.77
Wind
light
Recent rain
2h in last 6h
Pattern
washed out

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³570
Harrisburg, PA
Sky cover · visibility · 24h
Cloud cover
100%
OVERCAST
100%0%−24h−18h−12h−6hnow
Visibility
44.2mi
UNLIMITED
75 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
15:00 UTC · Harrisburg, PA · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
15:00 UTC · Harrisburg, PA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Harrisburg, PA
Satellite · infrared · animated
Harrisburg, PA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Harrisburg, PA
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:36 AM
Sunrise
2:06 AM
Daylight
14h 14m
Sunset
4:20 PM
Civil dusk
8:53 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Harrisburg, PA
The moon
Waning Gibbous
84% illuminated
Moonrise
9:50 PM
Moonset
10:10 AM
In sign
♓︎ Pisces
Harrisburg, PA
Microseason
Aug 1–5

Night falls a minute earlier

celestial
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Harrisburg at a glance

  • Today vs. normal: 17°F above the seasonal normal for this latitude
  • Last frost: April 18 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 17101, 17102, 17103, 17104, 17109, 17110, 17111, 17112 +2 more

16-Day Forecast — Harrisburg

  1. Sun81°74°57%
  2. Mon84°72°37%
  3. Tue83°65°10%
  4. Wed85°64°37%
  5. Thu89°72°60%
  6. Fri94°71°58%
  7. Sat94°70°47%
  8. Sun97°72°26%
  9. Mon98°71°21%
  10. Tue89°70°21%
  11. Wed83°62°12%
  12. Thu92°72°42%
  13. Fri96°73°45%
  14. Sat95°72°32%
  15. Sun94°72°18%
  16. Mon93°69°16%

Forecast data from Open-Meteo (CC BY 4.0).

Live wind & temperature near Harrisburg

Right now in the garden

Peak growing season

As of August 2, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Harrisburg

SPC has placed Harrisburg in the Marginal Risk category for severe thunderstorms today.

  • TODAYMRGLMarginal Risk
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3TSTMGeneral Thunderstorms

Isolated severe storms possible. Limited threat for hail or damaging wind.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

Sun & seasons in Harrisburg

Harrisburg sits in Dauphin County, where the year’s longest day runs 15h 3m of daylight and its shortest just 9h 18m — a swing of +5h 45m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

Philadelphia, the state’s largest city, lies about 94 miles to the E. The nearest town Harrisburg tracks is York, roughly 23 miles to the SSE.

Air quality in Harrisburg’s county has held roughly steady since 2020; its cleanest year on record was 2025 (median AQI 44). See the full air-quality history for Harrisburg.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · August 1–5

Night falls a minute earlier

Sunset retreats perceptibly — daylight shortening speeds up.

Day 214 of 365 · Wedge 43 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

The year in Harrisburg tops out in July (~75°F) and dips lowest in January (~29°F), with July wettest at 4.8 inches and February driest at 2.8 inches.

MonthMean tempPrecipRainy days
January29°2.9″6
February31°2.8″5
March39°3.9″6
April51°3.9″8
May61°4.0″9
June71°4.0″8
July75°4.8″7
August73°4.3″8
September65°4.6″6
October53°3.8″7
November42°2.9″6
December34°3.4″7

Regional context

Drawing on NOAA NCEI 1991-2020 normals, Harrisburg's January averages 29°F and July 75°F — 46°F apart — while precipitation totals roughly 45.2 inches over some 82 days.

Rainfall in Harrisburg stays even across the calendar: July tops out at 4.8 inches over 7.4 rainy days, and February still logs 2.8 inches across 5.3 — a narrow range for Harrisburg. That lines Harrisburg up with places like Wormleysburg, PA, West Fairview, PA and Penbrook, PA, fed by overlapping storm tracks.

By mid-April the frosts ease in Harrisburg, opening the season for kale, peas, spinach, and parsnips. Warm-soil crops in Harrisburg wait about two weeks past Harrisburg's last frost, once the soil warms. Harrisburg's window closes around mid-November as overnight lows return below freezing. In Harrisburg, low spots run 4-7°F colder than nearby slopes, nudging Harrisburg's frost dates a week.

Similar climates: Wormleysburg, PA, West Fairview, PA, Penbrook, PA, Lemoyne, PA, Progress, PA.

Naturalist notes

American robins begin their morning chorus in earnest during late April, coinciding with the warming soil temperatures after the last frost.

Tulip trees start leafing out in early May when nighttime temperatures consistently stay above 45°F.

Frequently asked

When does it freeze in Harrisburg?
In Harrisburg, expect the last spring frost near mid-April; Harrisburg's first autumn frost comes around mid-November.
What is the rainy season in Harrisburg?
July is the wettest month in Harrisburg, about 4.8 inches on average; the year totals roughly 45 inches.
What is the warmest month in Harrisburg?
July is Harrisburg's warmest month, averaging about 75°F.
What is the coldest month in Harrisburg?
Harrisburg bottoms out in January, with a mean near 29°F.
When can I start a vegetable garden in Harrisburg?
Frost-hardy sowings begin at mid-April in Harrisburg; warm-season starts follow two weeks on.
How many rainy days does Harrisburg get?
Harrisburg records around 82 days of measurable precipitation annually.
What hardiness zone is Harrisburg?
Harrisburg's hardiness zone tracks its winter low; with January near 29°F, check the USDA ZIP map for the exact zone.
What is the 10-day forecast for Harrisburg?
Harrisburg's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Harrisburg?
See this week's day-by-day rain chances for Harrisburg in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Harrisburg?
Current conditions for Harrisburg and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Harrisburg forecast updated?
The Harrisburg forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Harrisburg?
Today's sunrise and sunset times for Harrisburg are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Harrisburg?
The next few days in Harrisburg's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Harrisburg's warm-summer humid continental climate in Pennsylvania pairs 29°F Januarys with 75°F Julys, 46°F apart across the seasons.

Across the year, Harrisburg collects about 45 inches of precipitation over roughly 82 days with measurable rain or snow.

At 40.3°N, Harrisburg's 46°F summer-to-winter swing sets when Harrisburg's gardens wake and when frost returns.

All cities in Pennsylvania →

Philadelphia, PA weather →

ZIP codes in Harrisburg

  • 17101
  • 17102
  • 17103
  • 17104
  • 17120
  • 17110
  • 17105
  • 17108
  • 17121
  • 17122
  • 17123
  • 17124
  • 17125
  • 17126
  • 17127
  • 17128
  • 17129
  • 17130

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.