Discover the best time of year, based on historical climate, temperature, and precipitation.
The best weather in Aberdeen is from July, August, September. — consistent weather climate
🌥Mild
| Score | 6 | 10 | 17 | 26 | 57 | 73 | 95 | 93 | 83 | 40 | 8 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Climate | Cold | Cold | Cold | Cold | Mild | Mild | Mild | Mild | Mild | Cool & rainy | Cold | Cold |
| Temperature | 3–9°C | 3–9°C | 4–11°C | 5–13°C | 9–16°C | 11–18°C | 12–21°C | 13–22°C | 12–20°C | 9–15°C | 5–10°C | 3–8°C |
| Feels like | 0–6°C | -1–6°C | 0–8°C | 3–11°C | 7–15°C | 9–18°C | 12–21°C | 13–22°C | 11–19°C | 6–14°C | 2–8°C | 0–5°C |
| Precipitation | 305mm 24 days | 189mm 22 days | 181mm 22 days | 138mm 19 days | 74mm 12 days | 63mm 11 days | 14mm 4 days | 29mm 6 days | 83mm 11 days | 189mm 17 days | 301mm 23 days | 301mm 25 days |
| Sunshine | 2.9h ☀︎ 32% | 3.9h ☀︎ 38% | 5.8h ☀︎ 48% | 7.3h ☀︎ 54% | 9.0h ☀︎ 60% | 11.0h ☀︎ 69% | 12.0h ☀︎ 78% | 10.8h ☀︎ 76% | 9.2h ☀︎ 74% | 6.0h ☀︎ 56% | 3.8h ☀︎ 41% | 2.6h ☀︎ 30% |
| Wind | SE · 20 km/h | S · 19 km/h | S · 17 km/h | SW · 18 km/h | W · 16 km/h | W · 16 km/h | W · 16 km/h | W · 15 km/h | W · 15 km/h | S · 17 km/h | SE · 19 km/h | SE · 20 km/h |
| Humidity (%) | 87% | 85% | 83% | 80% | 80% | 79% | 80% | 80% | 83% | 85% | 88% | 88% |
| Day length | 9.0h | 10.3h | 12.0h | 13.6h | 15.1h | 15.8h | 15.4h | 14.1h | 12.5h | 10.9h | 9.4h | 8.6h |
A standard forecast guide tells you to visit in July, but Aberdeen is best in September, when Pacific skies remain largely clear while regional highway traffic empties out to its quietest stretch of the year.
Aberdeen is working timber and tidal mud, an unvarnished port town in Grays Harbor County that sits where the Chehalis River and the Wishkah River spill into the harbor basin. Flanked closely by Hoquiam and Cosmopolis, it exists in most travelers' minds as the gateway to the Olympic Peninsula—a place you refuel, cross the bridge, and leave behind for moss-draped temperate rainforests and sea stacks. But pause here, and you encounter the moody heart of coastal Washington. Most travelers misunderstand the calendar here entirely: the town fills with passing motorists during the sodden depths of winter, while late summer offers a tranquil, golden pause before the Pacific deluges return.
If you look purely at temperature charts, July claims the statistical crown. But July is also when the highway corridors bottleneck with holidaymakers speeding north toward the coast. September is the true prize. By early autumn, the town exhales. The transient traffic drops to its lowest ebb of the year, leaving the riverside streets, historical timber relics, and broad estuary banks blissfully unhurried.
The weather in September retains the best of late summer without the midsummer glare. Daytime temperatures sit comfortably around twenty degrees, the air carries a crisp cedar sharpness in the morning, and the sun stays out for over nine hours a day. While moisture begins to creep inland from Grays Harbor, rain arrives mostly as soft, sporadic showers that freshen the salt marshes rather than torrential soakings. You can linger along the Wishkah River or watch tugboats navigate the Chehalis River without contending with the caravan of camper vans and coastal haulers that dominate high summer.
Prices ease, locals reclaim their counter stools, and the entire surrounding landscape—from the mudflats to the hemlock ridges—takes on a mellow, copper-tinted calm. If you intend to use Aberdeen as a launchpad for the Olympic Peninsula, doing so in September means quiet access roads and pristine twilight skies.
July and August deliver the driest, warmest weather the Pacific Northwest coast can offer. For a region defined by perpetual moisture, this midsummer period can feel almost surreal: weeks go by with barely a whisper of drizzle, afternoon temperatures hover warmly in the low twenties, and twelve uninterrupted hours of sunlight light up the harbor waters.
Yet this near-perfect weather comes at a social cost. While Aberdeen itself rarely feels like a traditional resort enclave, Grays Harbor becomes a critical staging ground for thousands of summer road-trippers heading out to the ocean beaches or north into rainforest valleys. Main arteries see steady, relentless through-traffic, service stops hum with lines, and lodging along the route books up well in advance.
If you want guaranteed blue skies for outdoor exploring along the Chehalis River or an unhindered drive up the peninsula, July offers the most reliable conditions. Just know that you will share the highway, the viewpoints, and the town's humble roadside diners with every other visitor who prioritized a dry shirt above all else.
Spring arrives slowly and damply along the coast. April is still cool, with daytime temperatures struggling past thirteen degrees and lingering cloud cover, but the punishing downpours of midwinter begin to taper off into lighter, broken drizzles that coat the mossy roadside spruce trees in fresh mist.
By May and June, daylight stretches outward, pushing past eleven hours as summer approaches. These late spring months are a period of transition and deep green renewal. The tide flats of Grays Harbor wake up with migratory shorebirds, and surrounding logging roads through the hills toward Cosmopolis smell intensely of wet soil and emerging ferns. Temperatures lift toward the upper teens, creating comfortable conditions for morning strolls as long as you carry a reliable water-resistant shell.
Visitor numbers climb steadily during these months as regional travelers test the early-season trails. You will encounter mixed skies—one hour washed in bright coastal clarity, the next wrapped in low-hanging marine overcast—but June in particular offers long, rewarding evenings where dusk hangs over the harbor until well after nine at night.
October marks the abrupt return of the maritime rain machine. As temperatures drop into the mid-teens, Pacific fronts begin tracking directly into the mouth of Grays Harbor, dumping inches of rainfall across short spans and cutting daily sunshine down to a handful of pale hours.
Yet October carries a distinct coastal atmosphere that appeals to those drawn to the Pacific Northwest's trademark melancholy. The town settles into a deep quiet; crowd numbers sink to their absolute nadir, and the low gray clouds settle squarely over the steel bridges spanning the Wishkah River. The harbor smells of brine, wood pulp, and fallen alder leaves.
Outdoor travel requires careful timing around storm bands, but the absence of visitors gives Aberdeen a genuine, solitary edge. It is a month for drinking strong coffee by misted windows, walking the damp estuary paths between rain fronts, and watching the logging barges churn through swollen river currents under gunmetal skies.
Here lies the central paradox of Aberdeen's travel calendar: the town's busiest, most crowded months occur precisely when the weather is at its most punishing. Led by February and November, visitor traffic spikes dramatically even as winter storms unload hundreds of millimeters of rain per month in relentless, sodden sheets.
Winter along the harbor is an endurance trial of cold damp. Apparent temperatures linger around five or six degrees, bone-chilling humidity cuts through heavy wool, and daily sunshine shrinks to fewer than three hours in December and January. Heavy gales sweep off the Pacific, turning riverbanks slick and wrapping the timber mill chimneys in thick, impenetrable fog. November brings the most intense downpours, where rain falls with enough sustained fury to wash out trail plans and render open-air sightseeing completely unappealing.
Why the crowds? The region serves as an essential transit choke point for winter storm-watchers heading to ocean headlands, commercial haulers, and travelers navigating between the coast and Puget Sound. If you come during this stretch, do not expect a comfortable vacation town. Expect churning gray waterways, fog horn blasts drifting through the drizzle, waterlogged sidewalks, and a stark, industrial grit that shows Aberdeen at its most uncompromising.