Bethlehem, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Bethlehem weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle46%—98°72°—
- SundayJul 5Rain64%0.32″93°74°-5°
- MondayJul 6Light Showers96%—79°70°-14°
- TuesdayJul 7Drizzle76%0.03″73°64°-6°
- WednesdayJul 8Overcast18%—76°62°+3°
- ThursdayJul 9Overcast26%—87°64°+11°
- FridayJul 10Light Drizzle50%0.02″82°68°-5°
AQI 51 (Moderate), driven by Ozone. Ozone at AQI 86 now. With UV 8.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 96 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 86 now. With UV 8.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 96 around 1 PM.
- Present
- AQI 86
- UV peak
- 8.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 96
PM × Wind × Precip
PM2.5 at 9.2 µg/m³, PM10 at 10.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.92
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:56 PM
- Moonset
- 10:04 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Bethlehem at a glance
- Today vs. normal: 25°F above the seasonal normal for this latitude
- Last frost: April 20 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 18015, 18017, 18018, 18020
16-Day Forecast — Bethlehem
- Sat98°72°46%
- Sun93°74°64%
- Mon79°70°96%
- Tue73°64°76%
- Wed76°62°18%
- Thu87°64°26%
- Fri82°68°50%
- Sat84°70°26%
- Sun80°65°27%
- Mon77°64°24%
- Tue85°63°20%
- Wed85°61°20%
- Thu88°64°29%
- Fri90°66°32%
- Sat88°69°21%
- Sun86°73°25%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Bethlehem
Right now in the garden
Peak growing season
As of July 4, 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 today.
- TODAYSLGTSlight Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
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