Bethlehem in Summer
In summer (June, July and August), Bethlehem sees average daytime highs around 82°F and overnight lows near 63°F, with 11.3 in of rain over about 31 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.
Over the season highs climb from about 76°F in early June to 81°F by late August. The sky is clear or mostly clear about 26% of the time across summer, and the air most often feels dry.
Summer is Bethlehem's best season of the year to visit on our travel score. For the whole year in context, see Bethlehem's year-round climate.
- Avg daytime high
- 82°F
- warmest season of the year
- Avg overnight low
- 63°F
- Rainfall
- 11.3 in
- 31 wet days
- Avg wind
- 5 mph
- Travel score
- 5.9
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Bethlehem in Summer
Over the season highs climb from about 76°F in early June to 81°F by late August.
A typical summer day in Bethlehem reaches about 82°F and drops to 63°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Bethlehem
Once humidity and wind are folded in, summer brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Bethlehem weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 37° / 23° | 3.6 | 9.6 | 5.2 | 9.4 | 0.0 |
| Feb | 40° / 24° | 3.1 | 8.9 | 4.6 | 10.4 | 0.1 |
| Mar | 48° / 31° | 4.1 | 10.9 | 3.8 | 11.7 | 1.8 |
| Apr | 60° / 42° | 3.9 | 10.7 | 0.5 | 13 | 4.7 |
| May | 70° / 51° | 3.7 | 11.4 | 0 | 14.2 | 6.2 |
| Jun | 79° / 60° | 4.1 | 11 | 0 | 14.8 | 6.3 |
| Jul | 84° / 65° | 3.6 | 10.2 | 0 | 14.6 | 5.4 |
| Aug | 82° / 64° | 3.7 | 9.8 | 0 | 13.6 | 6.1 |
| Sep | 75° / 56° | 4.3 | 8.8 | 0 | 12.3 | 7.0 |
| Oct | 63° / 45° | 4.1 | 8.7 | 0.2 | 10.9 | 5.7 |
| Nov | 51° / 35° | 3.3 | 8.3 | 0.8 | 9.7 | 2.7 |
| Dec | 41° / 28° | 4.1 | 9.9 | 3.4 | 9.1 | 0.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 26% of the time across summer.
Chance of precipitation in Summer
Bethlehem gets around 11.3 in of rain over 31 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 5 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 42 min in early June to 13 hours by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.7 kWh/m².
Is summer a good time to visit Bethlehem?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Bethlehem for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Bethlehem in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Bethlehem sees daytime highs around 82°F and nights near 63°F. Pack light clothes. Worth having: rain gear and sun protection. About 31 days see rain.
UV index in Bethlehem in Summer
Clear-sky midday UV across summer averages around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Bethlehem peaks around July 10 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 8 | 8 | 6 | 6 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 6 | High |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Air quality in Bethlehem in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Bethlehem is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 13 | 14 | 14 | 16 | 17 | 18 | 15 | 13 | 10 | 9 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 13 | Moderate |
| Mar | 14 | Moderate |
| Apr | 14 | Moderate |
| May | 16 | Moderate |
| Jun | 17 | Moderate |
| Jul | 18 | Moderate |
| Aug | 15 | Moderate |
| Sep | 13 | Moderate |
| Oct | 10 | Good |
| Nov | 9 | Good |
| Dec | 10 | Good |
Where is Bethlehem?
Bethlehem sits at 40.6°N, 75.4°W, 358 ft above sea level, in United States. The nearest listed city is Allentown, 6.2 mi away.
Topography around Bethlehem
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Bethlehem.
Within 2 miles, the terrain around Bethlehem has only modest variations in elevation — a maximum elevation change of 778 ft around an average of 358 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,024 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,516 ft.
The land around Bethlehem is covered by trees (43%) and artificial surfaces (36%) within 2 miles, trees (49%) and grassland (21%) within 10 miles, and trees (73%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Bethlehem (40.6259°, -75.3705°, elevation 358 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.