Weather in Anchorage in August

Shoulder season. August sits in between. You will get good days and you will lose some. You should expect rain on 17 days of the month, which is more days wet than dry.

August ranks 3 of 12 in Anchorage. Only July scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 17 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 17.4 °C days and 11.4 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 5.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 28.5 °C and the coldest night fell to 5 °C, and the wettest single day dropped 51 mm — roughly 46% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 234 mm against 34 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 110 mm average is a reasonable planning figure, not a promise.

Wind is light at 5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 18.3 °C in July, 17.4 here, 12.8 in September. Nothing about the timing within the month matters much.

Daylight in August

16 hours of daylight, losing 2.7 hours across the month. That is between Anchorage's extremes of 19.3 and 5.5 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 27 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

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.

August in Anchorage versus nearby

If Anchorage is one option among several, the nearby comparison is worth making. Prince George is a better bet in August — 5.5 °C warmer, 6 days less rain. Tofino is a better bet in August — within a degree on temperature, 7 days less rain.

So: August works, with July the better month by 7 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Anchorage

See all twelve months in Anchorage, or where else to go in August.