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Best time to visit · Washington, United States
On the climate data, the best time to visit Snoqualmie Pass is July – September, scoring up to 98/100 with highs around 69°F (20°C) and 1.1 in (29 mm) of rain in July. June is a good shoulder-season month. The toughest months are November – January, mainly because of cool days.
Highs run from 33°F to 69°F across the year, and the yearly total is about 69.4 in (1764 mm) of rain and snow.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 34°F1°C | 35°F1°C | 38°F3°C | 43°F6°C | 55°F13°C | 61°F16°C | 69°F20°C | 69°F21°C | 62°F17°C | 50°F10°C | 39°F4°C | 33°F0°C |
| Avg low | 24°F-4°C | 23°F-5°C | 28°F-2°C | 32°F0°C | 39°F4°C | 44°F7°C | 50°F10°C | 50°F10°C | 45°F7°C | 37°F3°C | 29°F-2°C | 23°F-5°C |
| Rain/snow | 10.2 in258 mm | 6.6 in167 mm | 7.8 in197 mm | 5.1 in130 mm | 4.0 in101 mm | 3.1 in78 mm | 1.1 in29 mm | 1.5 in38 mm | 3.0 in76 mm | 7.2 in183 mm | 10.2 in258 mm | 9.8 in249 mm |
| Humidity | 97% | 96% | 95% | 91% | 84% | 82% | 79% | 78% | 80% | 86% | 93% | 97% |
| Cloud | 76% | 70% | 73% | 70% | 65% | 59% | 36% | 38% | 47% | 63% | 74% | 76% |
| Comfort | 20 | 32 | 27 | 40 | 65 | 80 | 98 | 97 | 86 | 49 | 20 | 20 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. Temperatures were adjusted from the grid cell's ~1,198 m (3,931 ft) to Snoqualmie Pass's ~923 m (3,028 ft) elevation using the standard lapse rate of 6.5°C per 1,000 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The coldest season, with highs of 33–35°F (0–1°C) and lows down to 23°F (-5°C). It's the wettest season, with about 26.5 in (674 mm) of rain or snow, 38% of the year's total. December – February are cold enough for snow. Comfort scores bottom out in December & January; the season averages 24/100.
Temperatures climb through the season, from 38°F highs in March to 55°F by May. About 16.9 in (428 mm) of rain or snow falls across these months, 24% of the year's total. March is cold enough for snow. Comfort scores sit mid-table, averaging 44/100.
Peak warmth: highs of 61–69°F (16–21°C). It's the driest season, with only about 5.7 in (145 mm) of rain, 8% of the year's total. Lows bottom out around 44°F (7°C). Comfort peaks here: July & August rank with the year's best, and the season averages 92/100.
Temperatures slide from 62°F highs in September to 39°F by November. About 20.4 in (517 mm) of rain falls across these months, 29% of the year's total. Nights dip below freezing in November. September is among the best-scoring months (season average 52/100).
By comfort score: 4 Great, 1 Good, 1 Fair and 6 Tough. Great months: June – September. Tap a month for its own guide.
On the climate data, the best time to visit Snoqualmie Pass is July – September, scoring up to 98/100 with highs around 69°F (20°C) and 1.1 in (29 mm) of rain in July. June is a good shoulder-season month. The toughest months are November – January, mainly because of cool days.
January is the wettest month, averaging about 10.2 in (258 mm) of rain or snow. July is the driest, with about 1.1 in (29 mm). The yearly total is around 69.4 in (1764 mm).
February is the coldest, with average lows of 23°F (-5°C) and highs of 35°F (1°C). The warmest is August, with average highs of 69°F (21°C).
Not very: summer (June – August) humidity averages 80%, and highs peak around 69°F (21°C), so it rarely feels sticky.
On average, yes: lows fall below 32°F (0°C) in November – April, bottoming out around 23°F (-5°C) in February.
Poll the group on July – September dates, then plan the days, packing and costs together.
