Weather in Seattle in July

Prime time. July is about as good as Seattle gets. Highs average 23.5 °C, lows 13.3 °C, and rain falls on 4 days — nothing in the month is working against you.

July is the highest-scoring month of the twelve. The nearest rival is August, and the month at the other end of the year is December.

Rain falls on only 4 days, so an itinerary with no wet-weather fallback is a reasonable risk. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest July day reached 38.4 °C and the coldest night fell to 8.3 °C.

July is moderately variable: 4 mm in the driest year against 41 mm in the wettest, around an average of 19 mm. Roughly two Julys in three land near that average, and the third does something else entirely.

Wind is light at 1.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 77%, high enough to notice on the warm days without dominating them.

How July sits in the year

Temperatures hold steady either side: 20.1 °C in June, 23.5 here, 23.9 in August. Nothing about the timing within the month matters much. Rain has already shifted: 7 days fewer than June had.

Daylight in July

July is at or near the longest days of Seattle's year: 15.6 hours of daylight, losing 0.9 hours across the 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

Peak season. Expect the highest prices of the year and to be booking well ahead.

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

July 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, 3 days more rain. Vancouver is the weaker option in July — within a degree on temperature, 5 days more rain.

So: July is the answer for Seattle. If it is booked out or priced out, August is the next best thing at 3 points behind, and December is the month to keep off the shortlist.

Every month in Seattle

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