Allentown, Pennsylvania Weather
Last leaves cling stubbornly. Day 50 of autumn. Read this microseason across nine climate regions →
Allentown weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 4:28 PM EST · Open-Meteo
- TodayNov 10Clear——63°43°—
- WednesdayNov 11Overcast——62°41°-1°
- ThursdayNov 12Light Drizzle82%0.03″57°44°-5°
- FridayNov 13Light Drizzle55%—47°37°-10°
- SaturdayNov 14Overcast21%—46°36°-1°
- SundayNov 15Overcast——48°36°+2°
- MondayNov 16Partly Cloudy——51°38°+3°
Air quality now AQI 28 · Good
AQI 28 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 36 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 36 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 36
- UV peak
- 0.1 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 36
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).
When the wind is in the west, the weather is at its best.
- Moonrise
- 8:22 AM
- Moonset
- 5:23 PM
- In sign
- ♐︎ Sagittarius
Last leaves cling stubbornly
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Allentown at a glance
- Today vs. normal: Today averages 53°F (high 63°F, low 43°F), 8°F above the 45°F normal for Nov 10
- Last frost: April 20 (1991–2020 median, NOAA station 7 km away)
- Microseason: Nov 6–10
- Planting calendar: November — harvest fall brassicas, carrots
16-Day Forecast — Allentown
- Tue63°44°0%
- Wed62°41°4%
- Thu57°44°82%
- Fri47°37°55%
- Sat46°36°21%
- Sun48°36°0%
- Mon51°38°2%
- Tue49°38°4%
- Wed52°36°3%
- Thu51°34°3%
- Fri50°38°6%
- Sat57°39°13%
- Sun64°43°30%
- Mon65°39°35%
- Tue40°30°35%
- Wed42°30°13%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Allentown
Interactive wind and temperature map centered on Allentown — it loads in your browser. Open the full weather map.
Right now in the garden
Post-frost dormancy
As of November 10, the season's first frost (typically October 24) is due or past. Bring frost-tender plants indoors, mulch overwintering beds, and turn spent plantings under. This city's planting calendar for November: harvest fall brassicas and carrots.
SPC Convective Outlook
Storm Prediction Center — Allentown
SPC includes Allentown in the general thunderstorm area day after tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
Sun & seasons in Allentown
Allentown sits in Lehigh County, where the year’s longest day runs 15h 5m of daylight and its shortest just 9h 16m — a swing of +5h 49m 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 44 miles to the SSE. The nearest town Allentown tracks is Trumbauersville, roughly 14 miles to the SSE.
Air quality in Allentown
Air quality in Allentown’s county has trended cleaner since 2020; its cleanest year on record was 2024 (median AQI 39). See the full air-quality history for Allentown.
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, radishes |
| 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
July is Allentown's warmest stretch (~75°F) and January its coldest (~29°F); precipitation crests in December at 4.3 inches and ebbs in February to 2.9 inches.
| Month | Mean temp | Precip |
|---|---|---|
| January | 29° | 3.4″ |
| February | 31° | 2.9″ |
| March | 40° | 3.7″ |
| April | 51° | 4.0″ |
| May | 60° | 4.1″ |
| June | 69° | 4.1″ |
| July | 75° | 3.4″ |
| August | 74° | 4.1″ |
| September | 67° | 3.9″ |
| October | 56° | 3.2″ |
| November | 43° | 3.8″ |
| December | 33° | 4.3″ |
Regional context
Similar climates Fullerton, PA, Dorneyville, PA, Cetronia, PA
In Allentown, modelled 1991-2020 normals (EC_Earth3P_HR model via Open-Meteo) put January near 29°F and July near 75°F — a 47°F seasonal arc — with about 44.9 inches of precipitation.
Rainfall in Allentown splits evenly between the seasons: December tops out at 4.3 inches, and February logs 2.9 inches — neither half of Allentown's year dominates. That lines Allentown up with places like Fullerton, PA, Dorneyville, PA and Cetronia, PA, fed by overlapping storm tracks.
Around April 20, Allentown sheds its freezing nights — kale, peas, spinach, and parsnips go into Allentown's beds. Tomatoes and peppers do best set out two weeks later in Allentown, once nights clear the mid-40s°F. The season ends by October 24 in Allentown, once hard frosts set back in. That date is a median: Allentown freezes sooner in half of years.
Similar climates: Fullerton, PA, Dorneyville, PA, Cetronia, PA, Catasauqua, PA, Fountain Hill, PA.
Frequently asked
- When does it freeze in Allentown?
- In Allentown, expect the last spring frost near April 20; Allentown's first autumn frost comes around October 24.
- What is the rainy season in Allentown?
- December is the wettest month in Allentown, about 4.3 inches on average; the year totals roughly 45 inches.
- What is the warmest month in Allentown?
- Allentown peaks in July, when the mean runs near 75°F.
- What is the coldest month in Allentown?
- January is Allentown's coldest month, averaging about 29°F.
- When can I start a vegetable garden in Allentown?
- In Allentown, sow peas and hardy greens around April 20; Allentown's tomatoes and peppers wait two weeks more.
- What hardiness zone is Allentown?
- Because Allentown bottoms near 29°F in January, that winter low sets Allentown's USDA zone — verify by ZIP.
- What is the 10-day forecast for Allentown?
- Allentown'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 Allentown?
- See this week's day-by-day rain chances for Allentown in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Allentown?
- Current conditions for Allentown and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Allentown forecast updated?
- The Allentown forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Allentown?
- Today's sunrise and sunset times for Allentown 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 Allentown?
- The next few days in Allentown's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Allentown sits at 40.6°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Allentown
- 18001
- 18101
- 18102
- 18103
- 18104
- 18105
- 18106
- 18109
- 18195