Temperature
Warm by day, brisk at night.
80°Ftypical September high
Typical range
September climate
September in Arvada
United States · North America
Warm days and plenty of sun.
One of the best months here
Mid to late
Daytime high
80°F
Lows around 51°F
Rain
A few rainy days
Sun
11 h/day
Air feel
Very dry
When to visit
Month-by-month fit
Best
Precipitation
A few rainy days. About 6 wet days this month.
20%wet-day frequency
Precip amountWet-day chanceSnowfall
Sunshine
Plenty of sun this month.
11.1 hSeptember sunshine
Heat & humidity by month
Warm days with mostly dry air.
Very drySeptember Heat feel
Easy airWarm airHot air
Hourly temperature pattern
In September, afternoons feel about 72° and nights feel near 47°.
FrigidFreezingVery coldColdCoolComfortableWarmNight hours
Clear sky
Mostly clear skies this month.
65%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
5 mphSeptember Calm
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 77°F, easing to about 69°F in early evening.
Avg temp Typical range
Morning66°F
Rain5%
Cloud29%
Humid airLow
Sun intensityModerate
Best windowMidday75°F
Rain7%
Cloud36%
Humid airLow
Sun intensityStrong
Late afternoon77°F
Rain11%
Cloud48%
Humid airLow
Sun intensityModerate
Early evening69°F
Rain10%
Cloud42%
Humid airLow
Sun intensityMinimal
Data tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 44 | 20 | 0.9 | 5 | 8.5 | 61 |
| Feb | 47 | 21 | 1.0 | 6 | 9.3 | 59 |
| Mar | 56 | 28 | 1.9 | 8 | 10.5 | 54 |
| Apr | 64 | 35 | 2.6 | 10 | 11.0 | 53 |
| May | 71 | 44 | 3.4 | 13 | 12.1 | 57 |
| Jun | 83 | 54 | 1.9 | 9 | 12.9 | 52 |
| Jul | 89 | 60 | 1.5 | 8 | 13.0 | 50 |
| Aug | 86 | 59 | 1.5 | 7 | 12.4 | 51 |
| Sep | 80 | 51 | 1.4 | 6 | 11.1 | 50 |
| Oct | 67 | 40 | 1.5 | 6 | 9.7 | 53 |
| Nov | 55 | 29 | 1.0 | 5 | 8.6 | 56 |
| Dec | 45 | 21 | 0.9 | 5 | 8.1 | 59 |
Similar climates
Similar
Similar travel styleAlturasUnited StatesSimilar travel styleAmerican ForkUnited StatesSimilar travel styleAuroraUnited StatesSimilar travel styleBaker CityUnited States
Want a side-by-side climate view? Compare Arvada with Alturas.
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