July brings 24°C daytime highs, 18mm of precipitation across about 3 wet days and 15.4 hours of daylight — best for hiking, cycling and reliable sunshine. The strongest run of the year is July to September. December is the quietest month: wet but green, and still good for festive season and quiet and local.
Long-run climate normals for Seattle. Month ratings compare months within Seattle only — they are not a ranking of Seattle against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | July — Hiking, Cycling, Reliable sunshine |
| Best 3-month window | July–September |
| Quietest month | December — Wet but green |
| Driest month | July — 18mm |
| Wettest month | November — 144mm |
| Warmest / coolest | July 24°C / February 8°C |
| Seasonality | Strongly seasonal — the months feel like different places |
| Annual rainfall | 952mm over roughly 152 rain days |
December gets roughly 689% more precipitation than July — 142mm against 18mm. That difference, more than temperature, is what changes how a day here feels.
Daytime highs only move 16°C across the whole year (8–24°C), so timing matters far less here than rainfall does.
June gives you 15.8 hours of daylight against just 8.2 in December — a 8-hour difference in how much you can actually fit into a day.
July is the driest month at 18mm across roughly 3 wet days, while November peaks at 144mm.
August is almost as good as July, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
Seattle changes character completely through the year — July and December are effectively two different destinations. Pick the month that matches what you want to do, not the highest-rated one.
Ratings compare months within Seattle, not against destinations worldwide: five stars means the best time to be here, not that Seattle beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★☆☆☆ | 8°C / 3°C | 141mm | 23 | 5h | 8.6h | Low-angle light · Quiet and local |
| February | ★★☆☆☆ | 8°C / 3°C | 88mm | 14 | 3h | 10h | Low-angle light · Quiet and local |
| March | ★★☆☆☆ | 10°C / 5°C | 93mm | 15 | 5h | 11.7h | Spring greenery · Quiet and local |
| April | ★★★☆☆ | 14°C / 7°C | 71mm | 12 | 6h | 13.5h | Hiking · Cycling · Spring greenery |
| May | ★★★★☆ | 18°C / 10°C | 51mm | 8 | 6h | 15h | Hiking · Cycling · Spring greenery |
| June | ★★★★☆ | 22°C / 12°C | 40mm | 7 | 7h | 15.8h | Hiking · Cycling |
| July | ★★★★★ | 24°C / 14°C | 18mm | 3 | 11h | 15.4h | Hiking · Cycling · Reliable sunshine |
| August | ★★★★★ | 24°C / 14°C | 22mm | 4 | 11h | 14h | Hiking · Cycling · Reliable sunshine |
| September | ★★★★★ | 22°C / 12°C | 38mm | 6 | 11h | 12.3h | Hiking · Cycling · Reliable sunshine |
| October | ★★★☆☆ | 18°C / 10°C | 87mm | 14 | 6h | 10.5h | Hiking · Cycling · Autumn colour |
| November | ★★☆☆☆ | 14°C / 7°C | 144mm | 23 | 4h | 9h | Autumn colour · Low-angle light · Quiet and local |
| December | ★★☆☆☆ | 10°C / 5°C | 142mm | 23 | 3h | 8.2h | Festive season · Quiet and local |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | July | 11h daily sunshine, 24°C highs and only 3 rain days. |
| City walking & sightseeing | July | 24°C highs with 15.4h of daylight — long days without heat fatigue. |
| Photography & light | July | 11h of sun and 15.4h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | June | Scores 80/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | May | 18°C highs and 10°C nights suit anyone who dislikes heat. |
Each month in Seattle is described from long-run climate normals and then rated relative to the other eleven months in the same city. A five-star January in a cold destination means January is one of the best times to be there — not that it beats a Mediterranean summer.
| Factor | Weight | What it measures |
|---|---|---|
| Temperature | Described | Average daytime high and overnight low for the month, shown as measured rather than judged. |
| Precipitation | Described | Monthly millimetres and wet-day count, labelled as snow or rain/snow where temperatures make that the likely phase. |
| Sunshine & daylight | Described | Average daily sunshine hours and astronomical daylight length at mid-month, from the city’s latitude. |
| “Best for” tags | Derived | Applied only when the conditions genuinely support the activity — snow depth-friendly cold for skiing, 13–24°C and low rain risk for hiking, dark evenings at high latitude for aurora. A month with few strong use cases gets fewer tags rather than padded ones. |
| Star rating | Relative | Ranks the month against the other eleven months in the same city. Never a comparison between cities. |
Figures are long-run climate averages, not a forecast for a specific year. Where a month lacks sourced rainfall or humidity, the value is modelled from temperature range and rain frequency.
July is the best all-round month in Seattle: 24°C highs, 18mm of precipitation and 15.4 hours of daylight, which suits hiking, cycling and reliable sunshine. The strongest three-month window is July to September.
December — 10°C highs, 142mm of precipitation over roughly 23 days and 8.2 hours of daylight. It is the cheapest and least crowded time to go, and it still works for festive season and quiet and local.
July is the driest month at 18mm over about 3 rain days, against 144mm in November. Across the year Seattle records around 952mm.
Yes, but the months are genuinely different trips. July suits hiking, cycling and reliable sunshine, while December suits festive season and quiet and local. Pick the month that matches what you want to do.
Daylight ranges from 8.2 hours in December to 15.8 hours in June, calculated from the city's latitude.