Allentown/Bethlehem weather by month & the best time to visit
United States · city break · humid subtropical climate
The best time to visit Allentown/Bethlehem is May — its sunniest month (Sunshine Score 72/100), with August and September close behind. Allentown/Bethlehem averages about 2,074 hours of sunshine a year. Daytime highs around 22°C / 72°F and roughly 104 mm of rain in May.
When is the best time to visit Allentown/Bethlehem?
For sunshine, the best time to visit Allentown/Bethlehem is May, then August and September. The dullest month is January (0/100, 75 mm of rain). The full month-by-month picture is in the table below.
How sunny is Allentown/Bethlehem?
Allentown/Bethlehem gets a moderate 2,074 hours of sunshine a year. 72 Sunshine Score points separate May (72) from January (0), so the month you pick matters. It ranks #375 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. The year's 1,234 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV |
|---|---|---|---|---|---|
| January | 0 | 2° / 36°F | -6° / 21°F | 75 mm | 1 |
| February | 0 | 3° / 37°F | -6° / 21°F | 74 mm | 2 |
| March | 6 | 9° / 48°F | -2° / 28°F | 91 mm | 3 |
| April | 49 | 16° / 61°F | 4° / 39°F | 97 mm | 5 |
| May | 72 | 22° / 72°F | 10° / 50°F | 104 mm | 6 |
| June | 68 | 27° / 81°F | 16° / 61°F | 124 mm | 7 |
| July | 68 | 30° / 86°F | 19° / 66°F | 126 mm | 7 |
| August | 69 | 29° / 84°F | 18° / 64°F | 118 mm | 6 |
| September | 69 | 26° / 79°F | 14° / 57°F | 119 mm | 5 |
| October | 58 | 18° / 64°F | 7° / 45°F | 116 mm | 3 |
| November | 19 | 11° / 52°F | 1° / 34°F | 86 mm | 2 |
| December | 0 | 5° / 41°F | -3° / 27°F | 104 mm | 1 |
Nearest destinations
Head-to-head
How Allentown/Bethlehem compares month by month: Allentown/Bethlehem vs Philadelphia · Allentown/Bethlehem vs Trenton · Allentown/Bethlehem vs Harrisburg · Allentown/Bethlehem vs Wilkes-Barre/Scranton · all comparisons
Allentown/Bethlehem: questions and answers
What kind of destination is Allentown/Bethlehem?
Allentown/Bethlehem is a city break in United States with a humid subtropical climate.
How many hours of sunshine does Allentown/Bethlehem get a year?
Allentown/Bethlehem gets about 2,074 hours of sunshine a year, at its best around May.
When is the best time to visit Allentown/Bethlehem?
The sunniest time to visit Allentown/Bethlehem is May, when the Sunshine Score peaks at 72/100 (with August and September close behind). Expect daytime highs around 22°C / 72°F.
What is the least sunny month in Allentown/Bethlehem?
January is the least sunny month in Allentown/Bethlehem, scoring 0/100 with about 75 mm of rain.
How strong is the sun in Allentown/Bethlehem?
The typical midday UV index in Allentown/Bethlehem peaks around 7 (high) in June, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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