Bethlehem, Pennsylvania Weather
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Climate of Bethlehem: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Bethlehem, with average daytime highs around 30°C. January is the coolest, when nights typically fall to about -7°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 36°C, so the seasons feel very different from each other.
The area receives about 1230 mm of rain in a typical year. Most of it falls from May to October and December (around 66% of the yearly total), and July is the wettest month at roughly 126 mm.
There is no long, mild season here; September usually comes closest to comfortable outdoor weather, with highs near 25°C.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 2° | -7° | 75 mm | 87% |
| Feb | 3° | -6° | 74 mm | 86% |
| Mar | 8° | -2° | 91 mm | 82% |
| Apr | 16° | 4° | 97 mm | 78% |
| May | 22° | 10° | 104 mm | 79% |
| Jun | 27° | 15° | 124 mm | 77% |
| Jul | 30° | 18° | 126 mm | 72% |
| Aug | 29° | 17° | 118 mm | 72% |
| Sep | 25° | 13° | 119 mm | 73% |
| Oct | 18° | 7° | 116 mm | 79% |
| Nov | 11° | 1° | 86 mm | 82% |
| Dec | 4° | -4° | 104 mm | 87% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Bethlehem. Values describe typical conditions, not a forecast.
About Bethlehem weather
Bethlehem is one of many towns in Pennsylvania's humid continental climate, from the Appalachians to the Delaware valley, about 77 km north of Philadelphia. Before the rains arrive, there's warm, humid summers (June–August). Cooler months mean cold winters (December–February) with regular snow. This page shows live, auto-refreshing weather for Bethlehem: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/New_York.
Frequently asked questions
Bethlehem is about 77 km north of Philadelphia, in Pennsylvania.
Bethlehem sees cold winters (December–February) with regular snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Bethlehem's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Bethlehem, with average daytime highs of about 30°C and nights around 18°C.
The coldest nights come in January, when the average low is about -7°C and daytime highs reach around 2°C. Frost is possible on clear, calm nights.
Bethlehem receives about 1230 mm of rain in a typical year. July is the wettest month at roughly 126 mm, and the main rainy period is May to October and December.
There is no long mild season in Bethlehem. September usually comes closest to comfortable outdoor weather.
In November Bethlehem typically sees daytime highs near 11°C and lows near 1°C, with about 86 mm of rain over the month and average humidity around 82%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Bethlehem is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Bethlehem's day-to-day weather follows the broader pattern of Pennsylvania described above. See the hourly weather forecast or the air quality index for more detail.