Weather in Boulder, CO
Boulder, Wednesday, 7 October, 11:30
Clear. Feels like 70°. High 79°, low 55°.
Monthly outlook for Boulder, CO: average high 66.2°, average low 45.5°. That is 1.8° above the climate normal for October. Precipitation is expected on 3 days (about 2.1 inches), against a normal of 4 days and 0.9 inches. The warmest day looks like 8 October (83.5°), the coolest 16 October (30.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 7 October – 16 October | 70° | 63.6° | +3.5° |
| 17 October – 26 October | 59.8° | 60.6° | -0.4° |
| 27 October – 5 November | at normal | 53.6° | — |
October records over 66 years
0
Boulder, Thursday, 8 October
Light rain. High 83°, low 53°.
0.02Boulder, Friday, 9 October
Light rain. High 82°, low 47°.
0.03Boulder, Saturday, 10 October
Light rain. High 78°, low 49°.
0.01Boulder, Sunday, 11 October
Light rain. High 72°, low 52°.
0Boulder, Monday, 12 October
Clear. High 69°, low 44°.
0
Boulder, Tuesday, 13 October
Overcast. High 66°, low 44°.
0.01Boulder, Wednesday, 14 October
Light rain. High 66°, low 57°.
0.52
Boulder, Thursday, 15 October
Snow. High 55°, low 36°.
0.01Boulder, Friday, 16 October
Light snow. High 48°, low 30°.
0.03Boulder, Saturday, 17 October
Light snow. High 49°, low 31°.
0Boulder, Sunday, 18 October
Clear. High 57°, low 35°.
0Boulder, Monday, 19 October
Clear. High 66°, low 44°.
0
Boulder, Tuesday, 20 October
Mostly clear. High 71°, low 50°.
0.55Boulder, Wednesday, 21 October
Rain. High 61°, low 47°.
0.89Boulder, Thursday, 22 October
Rain. High 54°, low 53°.
0.04
Boulder, Friday, 23 October
Climate normal for this date — 60-year average.
0.05Boulder, Saturday, 24 October
Climate normal for this date — 60-year average.
0.06Boulder, Sunday, 25 October
Climate normal for this date — 60-year average.
0.08Boulder, Monday, 26 October
Climate normal for this date — 60-year average.
0.04Boulder, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06Boulder, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.07
Boulder, Thursday, 29 October
Climate normal for this date — 60-year average.
0.06Boulder, Friday, 30 October
Climate normal for this date — 60-year average.
0.05Boulder, Saturday, 31 October
Climate normal for this date — 60-year average.
0.07Boulder, Sunday, 1 November
Climate normal for this date — 60-year average.
0.08Boulder, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Boulder, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.04Boulder, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.03Boulder, Thursday, 5 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Boulder, CO are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Boulder, CO since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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