Harrisburg, Pennsylvania Weather
Apples hang heavy on the branch. Day 93 of summer. Read this microseason across nine climate regions →
Harrisburg weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 1:20 AM EDT · Open-Meteo
- TodaySep 21Overcast later41%—68°61°—
- TuesdaySep 22Rain75%1.1″62°51°-6°
- WednesdaySep 23Light Rain22%0.13″63°49°+1°
- ThursdaySep 24Overcast——65°48°+2°
- FridaySep 25Overcast19%—70°44°+5°
- SaturdaySep 26Overcast20%—70°51°0°
- SundaySep 27Overcast——74°57°+4°
Air quality now AQI 26 · Good
AQI 26 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±4 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
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).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:40 PM
- Moonset
- 1:25 AM
- In sign
- ♑︎ Capricorn
Apples hang heavy on the branch
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Harrisburg at a glance
- Today vs. normal: Today averages 65°F (high 68°F, low 61°F), 2°F above the 63°F normal for Sep 21
- Last frost: April 15 (1991–2020 median, NOAA station 1 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
15-Day Forecast — Harrisburg
- Mon68°61°41%
- Tue62°51°75%
- Wed63°49°22%
- Thu65°48°6%
- Fri70°44°19%
- Sat70°51°20%
- Sun74°57°9%
- Mon72°50°6%
- Tue75°51°10%
- Wed80°56°21%
- Thu86°60°14%
- Fri74°57°14%
- Sat83°57°16%
- Sun79°67°26%
- Mon72°48°19%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Harrisburg
Interactive wind and temperature map centered on Harrisburg — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 23) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
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
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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes | radishes |
| May | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach |
| July | tomatoes, peppers, beans, squash | lettuce, peas, beans, summer squash, garlic |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
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.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 29° | 2.9″ | 6 |
| February | 31° | 2.8″ | 5 |
| March | 39° | 3.9″ | 6 |
| April | 51° | 3.9″ | 8 |
| May | 61° | 4.0″ | 9 |
| June | 71° | 4.0″ | 8 |
| July | 75° | 4.8″ | 7 |
| August | 73° | 4.3″ | 8 |
| September | 65° | 4.6″ | 6 |
| October | 53° | 3.8″ | 7 |
| November | 42° | 2.9″ | 6 |
| December | 34° | 3.4″ | 7 |
Regional context
Similar climates Wormleysburg, PA, West Fairview, PA, Penbrook, PA
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 splits evenly between the seasons: July tops out at 4.8 inches over 7.4 rainy days, and February logs 2.8 inches across 5.3 — neither half of Harrisburg's year dominates. That lines Harrisburg up with places like Wormleysburg, PA, West Fairview, PA and Penbrook, PA, fed by overlapping storm tracks.
By April 15 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 October 23 as Harrisburg's overnight lows return below freezing. In about half of years, Harrisburg's last freeze comes after April 15.
Similar climates: Wormleysburg, PA, West Fairview, PA, Penbrook, PA, Lemoyne, PA, Progress, PA.
Frequently asked
- When does it freeze in Harrisburg?
- In Harrisburg, expect the last spring frost near April 15; Harrisburg's first autumn frost comes around October 23.
- 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 April 15 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.
Harrisburg sits at 40.3°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Harrisburg
- 17101
- 17102
- 17103
- 17104
- 17105
- 17108
- 17109
- 17110
- 17111
- 17112
- 17113
- 17120
- 17121
- 17122
- 17123
- 17124
- 17125
- 17126
- 17127
- 17128
- 17129
- 17130