Weather in Seattle in June

Prime time. If you get to pick your dates, June is the one. Highs average 20.1 °C, lows 10.8 °C, and rain falls on 11 days — nothing in the month is working against you.

June ranks 4 of 12 in Seattle: past the worst of the year but short of July, which is the month to book if the dates are open.

Rain on 11 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average June reaches 30 °C. Across the twenty years measured, the hottest June day reached 34.2 °C and the coldest night fell to 5 °C.

June is moderately variable: 16 mm in the driest year against 98 mm in the wettest, around an average of 51 mm. Roughly two Junes in three land near that average, and the third does something else entirely.

Wind is light at 2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 80%, high enough to notice on the warm days without dominating them.

How June sits in the year

The month is on the way up: 2.3 °C warmer than May, and July adds another 3.4 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short. Rain is the thing that moves: July brings 7 days less of it, so pushing the dates later buys drier weather.

Daylight in June

June is at or near the longest days of Seattle's year: 16 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

An inland climate

Despite being inland, the year stays fairly even: 21.9 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

June in Seattle versus nearby

If Seattle is one option among several, the nearby comparison is worth making. Maple Ridge is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Vancouver is close enough to be a coin toss — within a degree on temperature, 4 days more rain.

So: June works, with July the better month by 13 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Seattle

See all twelve months in Seattle, or where else to go in June.