Best Time to Dive Iowa
Across 5 Iowa dive sites with multi-year conditions history, September historically shows the most favorable days — 88% of sampled days in the good band. The next-highest months are July (87%), August (87%) and December (78%). April historically shows the fewest favorable days (34% of sampled days). These figures are historical climatology computed from measured conditions — patterns, not a forecast or a guarantee.
Computed from our own conditions climatology — measured history, not brochure copy.
Which months are historically most favorable in Iowa?
| Month | Historically favorable days | Water temp | Typical seas |
|---|---|---|---|
| Jan | 75% | — | — |
| Feb | 67% | — | — |
| Mar | 55% | — | — |
| Apr | 34% | — | — |
| May | 70% | — | — |
| Jun | 69% | — | — |
| Jul | 87% | — | — |
| Aug | 87% | — | — |
| Sep | 88% | — | — |
| Oct | 60% | — | — |
| Nov | 69% | — | — |
| Dec | 78% | — | — |
% = share of sampled days scoring in the favorable band, median across 5 dive sites with at least two years of history. Ringed = historical peak.
How does this compare worldwide? The Most Reliable Diving Months on Earth ranks 61 countries by the same measure.
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