Best Time to See Waterfalls: Flow by Month for 21 Places

Montmorency Falls carries 115.3 m³/s in an average May and 8.5 in February. That is the widest swing among the six rows below that rest on a river gauge, and it is the exception. At Niagara, the river that feeds the falls stays between about 3% below and 5% above its 12-month average all year. Between those two cases sit the 21 rows of the table.

Six of the 21 rows rest on a river gauge near enough to the falls to count. The other fifteen are estimates from rainfall at a weather station, and our one test of that method went badly. Against measured flow it put 3 to 9 months of the year in the wrong class, 5.3 on average, in six comparisons, all of them in Hawaii. We kept the estimates, marked each one, and ask you to read them as a rain calendar and not as a flow measurement. Rows with a gauge say Measured in their note.

If you book a tour from a category linked in the table, such as Maui, Krka or Montmorency Falls, we earn a commission at no extra cost to you. Nothing in a row changes because of that, and several rows say plainly that water is a weak reason to pick a month. How we are paid is written in our editorial policy.

Each month gets one of three labels. Most water means the month's average is at least 1.25 times the average of all twelve months. Little water means it is below 0.6 times. Everything between is usual flow. Both lines are our choice and not an agency's, and moving either one changes 4% to 6% of the cells in our working data. The stations, the thresholds and the failed test are set out on the method page, so this page can stay short on method.

Read most water as water, not as a good day. Where rain drives the flow, the month with the most water is also the month with the most rain falling on you, and for two rows the station recorded 300 mm or more in a single month: Bali in January at 345 mm (1961-1990 normal) and Phnom Kulen in September at 305 mm. We read that as a warning. A trail that is fine in the dry months may be closed or slick in those, and the table has no way to see it.

A peak month is the month with the most water. It is not always the month with the best visit.

Three things the shading hides. First, Montmorency's little water from January to March describes a low river in a cold month. The fall is still there. Second, Wailua, Hanalei and Damajagua have no little-water month at all, which means the table cannot help you pick a month there. Third, usual flow covers a wide range: Hanalei's June to August average about half of its March flow and still sit in the same band as the months around March.

Six. Each uses a station of the US Geological Survey or the Water Survey of Canada, and the table below gives the wettest and driest month of the record we used, which for Waimea and Honomanu is the whole record because 1991-2020 holds fewer than 15 annual records at those gauges. The Hawaiian gauges are in streams, at or near the places named, not at the falls themselves.

The raw statistics come from the USGS statistics service. Flow in a stream is not flow over a fall. A gauge upstream of a diversion, or below one, can tell a different story from the cliff edge. That is why the table gives gauge rows no more weight than their note allows.

Krka National Park writes, in its notice on the record water level of May 2023, that the highest water levels are usually recorded in November and March and the lowest in August. Our estimate for the Krka row, calculated by us from daily data at Knin, puts November and December on top, ranks March 10th of 12, and keeps August at usual flow. It misses March and it does not see August as low. If the two differ, trust the park.

Multnomah is another case. The Forest Service describes the fall as fed by underground springs from Larch Mountain, with a flow that varies and is usually highest in winter and spring, in a page we read through an archived copy of July 2025 because the live page refused our request. Our row for the Columbia River Gorge uses rain at Portland and marks November to February as most water. A spring-fed fall and a rain estimate do not fit well. At Plitvice the park speaks of autumn and spring and of ice in cold months, and gives no flow months, so that row is ours alone. Dunn's River is the weakest row: the station is some 100 km away and the labels barely separate the months.

When a park's sentence and our label disagree, the sentence wins.

Nine lines below cover the places left out or never classified. The reasons differ. Each one is stated. Two of them, Dettifoss and Victoria Falls, were in an earlier draft of the data and came out once we saw how thin the sources were. The rest never had enough to classify. The method page gives the full list and the stations behind it.

Our Niagara guide explains why a treaty and not the seasons sets the water over that fall. For Iguazú and Victoria, who stands on which side matters more than the month, and the comparison of the three border falls covers it. Snow and ice, including what happens at Dettifoss and Montmorency in winter, are in our guide to snowmelt and frozen falls, and the conflict at Tumpak Sewu is in the guide to how falls get their water.

Often. These averages cover a 30-year window, and a single year can sit far outside them. On 16 May 2023 the water level at Skradinski buk on the Krka reached 254 cm, the highest recorded since measuring began, above the previous 223 cm of 7 December 2005, and the park closed certain sections to the public for the first time in its history (Krka National Park). May is not one of the two months the park names as usually highest.

A river bulletin shows the same thing on a smaller scale. The Zambezi River Authority bulletin gives 296 m³/s at its Victoria Falls station on 26 October 2026 and 223 on the same date a year earlier. We use the pair only to show how much one year differs from the last. When the month you can travel has the water you want one year and not the next, the answer is a live source: a gauge, a park notice, an operator's closure page. The guide to what to do when a fall is closed or dry lists where to look, and our guide to choosing a waterfall tour covers the cancellation terms worth checking before you pay.

1. Find your place's regime in when does a waterfall have water: rain, snowmelt, springs or a regulated river.
2. Read the row and its note. If the note says rain estimate, take the shading as a hint. If it says Measured, take them as a record of the past.
3. In the week you travel, look at the live gauge or the park's notice. That reading is worth more than any average.

Start with the place. The same month that fills one fall can leave another a trickle, which is why the destinations we cover are listed in Where to go, and why each row of the table needs reading against its own regime and not against a global calendar.