Bethlehem, Pennsylvania Weather
Honeysuckle sweetens the night. Day 90 of spring. Read this microseason across nine climate regions →
Bethlehem weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 17Overcast18%—82°54°—
- ThursdayJun 18Overcast24%—92°66°+10°
- FridayJun 19Overcast——81°59°-11°
- SaturdayJun 20Overcast——78°57°-3°
- SundayJun 21Light Rain19%0.14″78°56°0°
- MondayJun 22Drizzle56%0.17″77°58°-1°
- TuesdayJun 23Overcast39%—81°57°+4°
AQI 31 (Good), driven by PM2.5. AQI down 13 over the last 6 hours (gradual decline). PM2.5 at 11.9 µg/m³ (AQI 56) with a 0.94 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 11.9 µg/m³ (AQI 56) with a 0.94 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.94
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 7:56 AM
- Moonset
- 10:39 PM
- In sign
- ♋︎ Cancer
Honeysuckle sweetens the night
Bethlehem at a glance
- Today vs. normal: 19°F below the seasonal normal for this latitude
- Last frost: April 20 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Bethlehem
- Wed82°54°18%
- Thu92°66°24%
- Fri81°59°3%
- Sat78°57°1%
- Sun78°56°19%
- Mon77°58°56%
- Tue81°57°39%
- Wed81°62°11%
- Thu81°63°26%
- Fri84°62°29%
- Sat94°65°28%
- Sun96°70°27%
- Mon92°69°27%
- Tue90°69°37%
- Wed85°69°37%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Bethlehem
Right now in the garden
Peak growing season
As of June 17, 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 — Bethlehem
SPC has placed Bethlehem in the Slight Risk category for severe thunderstorms tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWSLGTSlight Risk
- DAY 3NONENo severe risk
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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.
ZIP codes in Bethlehem
- 18017
- 18015
- 18018
- 18016