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Idaho · SUN

Sun Valley weather this week

Sun Valley, Idaho Just your ID

Sun Valley scores 7.3 out of 10 and has 2 genuinely clear days out of 16. Dull days (12) still outnumber bright ones (2), so this is not a good week.

7.3/10
Mostly dull
2 genuinely clear days, 0 partly cloudy, 12 overcast, 0 wet, 0 stormy — out of 16 forecast days.
Bright days 2 vs dull days 12. Dull wins, so we do not call this a good week.
We are not showing a flattering tier word here. Why the score and the sky can disagree.

14-day window, 0.9% rain-affected — The clouds are winning — 2 clear days out of 14, 78°F

The next 16 days in Sun Valley

Every number below is the forecast we hold, rendered as text — nothing here is drawn on a canvas or filled in by JavaScript. The rain figure is the highest chance across all 16 days (6%), not the lowest, because the worst number is the useful one.

Booking window Wed 30 Sep–Tue 13 Oct: 7.3/10 for those days alone. The 16-day outlook score (7.3) covers the full table below and includes days outside that window.

Sun Valley daily forecast, Tue 29 Sep to Wed 14 Oct (16 days total). Best single day scores 10.0; worst scores 6.2. A lone good day cannot carry the week.
Day High Low Rain chance Sky Day score
69°F 42°F 1% Clear clear 9.6
Clear skies, 69°F — pack a layer.
70°F 48°F 1% Overcast cloudy 8.3
Overcast, 70°F, dry as a bone.
73°F 48°F 0% Overcast cloudy 8.5
Overcast, 73°F, dry as a bone.
74°F 49°F 1% Overcast cloudy 8.5
Overcast, 74°F, dry as a bone.
74°F 48°F 1% Overcast cloudy 8.5
Overcast, 74°F, dry as a bone.
78°F 51°F 1% Light drizzle cloudy 7.0
Overcast, 78°F, dry as a bone.
72°F 54°F 0% Drizzle cloudy 6.2
Overcast, 72°F, dry as a bone.
71°F 51°F 2% Overcast cloudy 8.3
Overcast, 71°F, dry as a bone.
73°F 46°F 1% Overcast cloudy 8.5
Overcast, 73°F, dry as a bone.
74°F 49°F 1% Overcast cloudy 8.5
Overcast, 74°F, dry as a bone.
76°F 51°F 2% Clear clear 10.0
Clear skies, 76°F, zero drama.
75°F 52°F 3% Mainly clear clear 9.8
Clear skies, 75°F, zero drama.
74°F 54°F 3% Overcast cloudy 8.5
Overcast, 74°F, dry as a bone.
73°F 52°F 3% Overcast cloudy 8.5
Overcast, 73°F, dry as a bone.
74°F 48°F 6% Overcast cloudy 8.5
Overcast, 74°F, dry as a bone.
76°F 52°F 1% Clear clear 10.0
Clear skies, 76°F, zero drama.

How this week got its score

  • 14 forecast days: 2 clear/mainly clear, 0 partly cloudy, 12 overcast, 0 wet (fog/drizzle/rain/showers), 0 stormy.
  • Trimmed mean of day scores 8.5 × 0.55 = 4.65
  • Worst day drag: worst day is 6.2 × 0.25 = 1.55 - one bad day cannot be averaged away.
  • Longest consecutive run of good days (≥7.0) is 8/14 = 57% coverage × 0.20 = 1.14
  • Best single day is 10.0 but it only counts through the trimmed mean - a lone great day cannot carry the window.

The full model, including why a single great day cannot rescue a bad week, is on the methodology page.

Getting to Sun Valley

The nearest airport we price is SUN. From New York City that is about 4h 34m in the air out of SWF, 2032 miles. Then about 21m to drive from SUN (est. 14 mi — road model, not real routing). Total door-to-lounger: 4h 55m. Flight times from 55 other departure metros are on the search page.

Where to stay in Sun Valley

We hold no live hotel rates for Sun Valley right now, so there is nothing honest to show here. Rates return as soon as the supplier does — the refresh state is on system status.

So, should you go?

Sun Valley scores 7.3 out of 10 and has 2 genuinely clear days out of 16. Dull days (12) still outnumber bright ones (2), so this is not a good week. There is some sun in this window, but not much. Compare it against the rest of the list before booking.

Frequently asked

Is it raining in Sun Valley this week?

No. The current 16-day forecast for Sun Valley shows no rain or storm days, peaking at 6% chance on the worst day. Cloud is not the dealbreaker here — rain is, and none is forecast.

How many clear days does Sun Valley have this week?

2. Sun Valley has 2 genuinely clear days out of the next 16.

Is Sun Valley good for a trip this week?

Marginal. Sun Valley scores 7.3/10, but dull days (12) still outnumber bright ones (2) this week.

Sun Valley by month — 8-year ERA5 history

Historical clear-sky percentages from the ERA5 reanalysis (2018–2025). This is history, not a forecast — the 7-day forecast above is this week. They can and do differ.

Sun Valley: clear-sky % by month, ERA5 2018–2025. n = days sampled.
Month Historically clear Sample (n)
January 0% n=248 all destinations →
February 0% n=226 all destinations →
March 0% n=248 all destinations →
April 0% n=240 all destinations →
May 3% n=248 all destinations →
June 33% n=240 all destinations →
July 70% n=248 all destinations →
August 58% n=248 all destinations →
September 42% n=240 all destinations →
October 3% n=248 all destinations →
November 0% n=240 all destinations →
December 0% n=248 all destinations →

Each month links to the detailed almanac page for Sun Valley in that month. The “all destinations” column links to the full ranking across all destinations for that month.

Forecast data from Open-Meteo, last refreshed 2026-09-29T12:01:54.475365Z. Hotel names and rates come from LiteAPI and change constantly; the rate shown is the rate we held at refresh time, not a quote. Scores are forecasts, not guarantees, and the whole model is published on our methodology page.