Summit forecast, next 72 hours
- New snow0 in
- Strongest gusts10 mphSunday
- Coldest57°F
| Forecast | Snow | Gusts | Temp °F |
|---|---|---|---|
| This AfternoonSunny | 0 in | 10 mph | High 76° |
| TonightMostly Clear | 0 in | 10 mph | Low 57° |
| SaturdaySunny | 0 in | 10 mph | High 80° |
| Saturday NightMostly Clear | 0 in | 10 mph | Low 60° |
| SundayMostly Sunny | 0 in | 10 mph | High 80° |
| Sunday NightPartly Cloudy | 0 in | 5 mph | Low 62° |
Snow is the forecast new accumulation at the summit grid point. Dots use Road Travel’s driving-risk scale.
Typical weather by month
Monthly normals from the long-term stations nearest the summit. None sits exactly on the pass, so each column says how far away and how high it is.
| Month | Howard Prairie Dam 4,567 ft · 16 mi northeast of the summit | Copco Dam 2,703 ft · 15 mi east of the summit | ||
|---|---|---|---|---|
| High / low °F | Snow (in) | High / low °F | Snow (in) | |
| Jan | 36° / 23° | 25.4 | 48° / 27° | 4.7 |
| Feb | 40° / 24° | 23.5 | 53° / 29° | 2.7 |
| Mar | 45° / 26° | 16.0 | 58° / 32° | 0.6 |
| Apr | 51° / 30° | 9.2 | 64° / 35° | 0.6 |
| May | 60° / 36° | 1.2 | 74° / 42° | 0 |
| Jun | 68° / 40° | 0.1 | 82° / 49° | 0 |
| Jul | 79° / 47° | 0 | 93° / 56° | 0 |
| Aug | 79° / 46° | 0 | 93° / 55° | 0 |
| Sep | 72° / 40° | 0.1 | 85° / 49° | 0 |
| Oct | 58° / 33° | 1.0 | 70° / 39° | 0 |
| Nov | 42° / 28° | 14.8 | 56° / 32° | 1.5 |
| Dec | 35° / 23° | 26.3 | 47° / 26° | 4.4 |
NOAA NCEI U.S. Climate Normals, 1991–2020: HOWARD PRAIRIE DAM (USC00354060, 4,567 ft); COPCO #1 DAM (USC00041990, 2,703 ft). Snow days are days with at least 1 inch of new snow. “—” means the station does not publish that normal.
Cameras, road reports and winter rules
Conditions on the pass change by the hour, so these go straight to the official sources.
- For this passCaltrans I-5 highway conditions
- Oregon · ODOTTripCheck road conditions
- Oregon · winter rulesChain laws
- California · CaltransQuickMap conditions and cameras
- California · winter rulesChain controls
Check the official National Weather Service forecast for the summit and the road report before you leave.
Crossing Siskiyou Summit? See the summit at the hour you’ll be there
Road Travel times the forecast to your drive, so you see conditions at the summit when you will actually reach it, and get alerts about weather ahead on the way.
Questions about Siskiyou Summit
How high is Siskiyou Summit?
The summit is 4,310 ft above sea level, on I-5.
How far is Siskiyou Summit from Ashland and Yreka?
By road, the summit is 12 miles from Ashland, OR and 26 miles from Yreka, CA.
How cold does it get near Siskiyou Summit?
The coldest month is December. Copco Dam (2,703 ft, 15 mi east of the summit) averages a low of 26°F then (1991–2020 normals); the summit is 1,607 ft higher.