Waterloo (Iowa) weather by month & the best time to visit
United States · small town · hot-summer continental climate
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The best time to visit Waterloo (Iowa) is September — its sunniest month (Sunshine Score 76/100), with July and August close behind. Waterloo (Iowa) averages about 2,391 hours of sunshine a year. Daytime highs around 24°C / 75°F and roughly 92 mm of rain in September.
When is the best time to visit Waterloo (Iowa)?
For sunshine, the best time to visit Waterloo (Iowa) is September, then July and August. The dullest month is January (0/100, 26 mm of rain). The full month-by-month picture is in the table below.
How sunny is Waterloo (Iowa)?
Waterloo (Iowa) gets a moderate 2,391 hours of sunshine a year. 76 Sunshine Score points separate September (76) from January (0), so the month you pick matters. It ranks #249 of 580 destinations in United States for annual sunshine, above the national median of 2,279 hours. The year's 929 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 | -3° / 27°F | -12° / 10°F | 26 mm | 1 |
| February | 0 | 0° / 32°F | -11° / 12°F | 32 mm | 2 |
| March | 0 | 7° / 45°F | -4° / 25°F | 49 mm | 3 |
| April | 44 | 15° / 59°F | 3° / 37°F | 98 mm | 5 |
| May | 71 | 21° / 70°F | 10° / 50°F | 118 mm | 6 |
| June | 67 | 27° / 81°F | 16° / 61°F | 141 mm | 7 |
| July | 74 | 29° / 84°F | 18° / 64°F | 104 mm | 8 |
| August | 73 | 28° / 82°F | 17° / 63°F | 107 mm | 7 |
| September | 76 | 24° / 75°F | 12° / 54°F | 92 mm | 5 |
| October | 53 | 16° / 61°F | 4° / 39°F | 72 mm | 3 |
| November | 0 | 8° / 46°F | -2° / 28°F | 46 mm | 2 |
| December | 0 | 0° / 32°F | -8° / 18°F | 44 mm | 1 |
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Waterloo (Iowa): questions and answers
What kind of destination is Waterloo (Iowa)?
Waterloo (Iowa) is a small town in United States with a hot-summer continental climate.
How many hours of sunshine does Waterloo (Iowa) get a year?
Waterloo (Iowa) gets about 2,391 hours of sunshine a year, at its best around September.
When is the best time to visit Waterloo (Iowa)?
The sunniest time to visit Waterloo (Iowa) is September, when the Sunshine Score peaks at 76/100 (with July and August close behind). Expect daytime highs around 24°C / 75°F.
What is the least sunny month in Waterloo (Iowa)?
January is the least sunny month in Waterloo (Iowa), scoring 0/100 with about 26 mm of rain.
How strong is the sun in Waterloo (Iowa)?
The typical midday UV index in Waterloo (Iowa) peaks around 8 (very high) in July, 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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