Hourly Weather | Today Wednesday, May 20, 2026
Active Weather Warnings
Bethlehem, Pennsylvania
7 PM
Stormy Weather
82°
Feels Like 81°
65
Humidity: 57%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Weather
79°
Feels Like 81°
43
Humidity: 69%
UV Index: 0
Wind: 6 mph
9 PM
Stormy Weather
75°
Feels Like 72°
51
Humidity: 71%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Weather
72°
Feels Like 70°
47
Humidity: 72%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Weather
66°
Feels Like 64°
34
Humidity: 75%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

7 PM
35 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.4 µg/m³
  • PM10: 2.81 µg/m³
  • O3: 0.038 ppm
  • NO2: 2.9 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM
31 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.92 µg/m³
  • PM10: 3.42 µg/m³
  • O3: 0.034 ppm
  • NO2: 3.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
27 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.46 µg/m³
  • PM10: 4.03 µg/m³
  • O3: 0.029 ppm
  • NO2: 3.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
24 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.98 µg/m³
  • PM10: 4.64 µg/m³
  • O3: 0.026 ppm
  • NO2: 4.1 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
21 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.26 µg/m³
  • PM10: 4.96 µg/m³
  • O3: 0.022 ppm
  • NO2: 4.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Weather Alerts and Warnings for Bethlehem

Severe Future Possible

Severe Thunderstorm Watch

Severe Thunderstorm Watch issued May 20 at 2:10PM EDT until May 20 at 9:00PM EDT by NWS Mount Holly NJ
May 20, 2:10 PM May 20, 9:00 PM
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
235 IN EFFECT UNTIL 9 PM EDT THIS EVENING FOR THE FOLLOWING AREAS

IN DELAWARE THIS WATCH INCLUDES 3 COUNTIES

IN CENTRAL DELAWARE

KENT

IN NORTHERN DELAWARE

NEW CASTLE

IN SOUTHERN DELAWARE

SUSSEX

IN MARYLAND THIS WATCH INCLUDES 4 COUNTIES

IN NORTHEAST MARYLAND

CAROLINE KENT QUEEN ANNE'S
TALBOT

IN NEW JERSEY THIS WATCH INCLUDES 16 COUNTIES

IN CENTRAL NEW JERSEY

MERCER MONMOUTH

IN NORTHERN NEW JERSEY

HUNTERDON MIDDLESEX MORRIS
SOMERSET SUSSEX WARREN

IN SOUTHERN NEW JERSEY

ATLANTIC BURLINGTON CAMDEN
CAPE MAY CUMBERLAND GLOUCESTER
OCEAN SALEM

IN PENNSYLVANIA THIS WATCH INCLUDES 10 COUNTIES

IN EAST CENTRAL PENNSYLVANIA

BERKS LEHIGH NORTHAMPTON

IN NORTHEAST PENNSYLVANIA

CARBON MONROE

IN SOUTHEAST PENNSYLVANIA

BUCKS CHESTER DELAWARE
MONTGOMERY PHILADELPHIA

THIS INCLUDES THE CITIES OF ALLENTOWN, ATLANTIC CITY, BETHLEHEM,
BLAIRSTOWN, CAMDEN, CENTREVILLE, CHERRY HILL, CHESTERTOWN,
DENTON, DEPTFORD, DOVER, DOYLESTOWN, EAST BRUNSWICK, EASTON,
EASTON, EDISON, FLEMINGTON, FREEHOLD, GEORGETOWN, GLASSBORO,
HAMMONTON, JIM THORPE, MEDIA, MILLVILLE, MOORESTOWN, MORRISTOWN,
MOUNT HOLLY, NEW BRUNSWICK, NEWTON, NORRISTOWN,
NORTH BRUNSWICK TOWNSHIP, OCEAN CITY, PENNSVILLE, PERTH AMBOY,
PHILADELPHIA, READING, SAYREVILLE, SOMERSET, STROUDSBURG,
TOMS RIVER, TRENTON, WEST CHESTER, AND WILMINGTON.
Updated: May 20, 6:04 PM Source: NWS Alert
Moderate Expected Likely

Heat Advisory

Heat Advisory issued May 20 at 1:53PM EDT until May 20 at 8:00PM EDT by NWS Mount Holly NJ
May 20, 1:53 PM May 20, 8:00 PM
WHAT: Heat index values up to 96 degrees expected.

WHERE: In New Jersey, Morris, Somerset, Warren, and Hunterdon
Counties. In Pennsylvania, Berks, Lehigh, Northampton, Upper
Bucks, Western Chester, and Western Montgomery Counties.

WHEN: Until 8 PM EDT this evening.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.

ADDITIONAL DETAILS: Showers and thunderstorms arrive into this
evening which will end this early season heat.
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Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Updated: May 20, 6:04 PM Source: NWS Alert