Temperature
Pleasant by day, brisk at night.
70°Ftypical September high
Typical range
September climate
September in Skagit Valley
United States · North America
Mild days and plenty of sun.
One of the best months here
Some cloudier spells.
Daytime high
70°F
Lows around 56°F
Rain
Several rainy days
Sun
10 h/day
Air feel
Comfortable
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days. About 7 wet days, fewer than in most months.
23%wet-day frequency
Precip amountWet-day chanceSnowfall
Sunshine
A mix of sunshine and cloud.
10.2 hSeptember sunshine
Heat & humidity by month
ComfortableSeptember
Easy airWarm airHot airHumid air
Hourly temperature pattern
In September, afternoons feel about 66° and nights feel near 55°.
FreezingVery coldColdCoolComfortableNight hours
Clear sky
Partly cloudy skies this month.
42%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
3 mphSeptember Calm
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 67°F, easing to about 63°F in early evening.
Avg temp Typical range
Morning61°F
Rain20%
Cloud61%
Humid airLow
Sun intensityLow
Midday65°F
Rain24%
Cloud56%
Humid airLow
Sun intensityModerate
Late afternoon67°F
Rain20%
Cloud50%
Humid airLow
Sun intensityModerate
Early evening63°F
Rain18%
Cloud46%
Humid airLow
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 46 | 37 | 8.2 | 17 | 4.2 | 87 |
| Feb | 46 | 36 | 8.6 | 18 | 6.2 | 83 |
| Mar | 51 | 40 | 6.8 | 19 | 7.3 | 80 |
| Apr | 57 | 43 | 5.9 | 17 | 9.7 | 77 |
| May | 63 | 50 | 3.9 | 14 | 11.0 | 77 |
| Jun | 70 | 55 | 2.9 | 10 | 12.1 | 78 |
| Jul | 76 | 59 | 0.6 | 3 | 13.3 | 75 |
| Aug | 76 | 60 | 1.9 | 6 | 12.3 | 76 |
| Sep | 70 | 56 | 2.9 | 7 | 10.2 | 80 |
| Oct | 60 | 49 | 7.8 | 16 | 6.9 | 84 |
| Nov | 50 | 41 | 11.2 | 19 | 4.6 | 86 |
| Dec | 45 | 37 | 12.1 | 21 | 4.0 | 87 |
Similar climates
Similar
Similar travel styleNiagara FallsCanadaSimilar travel styleBledSloveniaSimilar travel styleNikkoJapanSimilar travel styleChiloeChile
Want a side-by-side climate view? Compare Skagit Valley with Niagara Falls.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jul 31, 2026
Data & methodology