Climate guide for Denver, United States

Best Time to Visit
Denver

How to read the score (0–10)
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01 · United States

About Denver

May-September opens Denver for Red Rocks evenings, Cherry Creek trails, and Rocky Mountain National Park day trips. Start altitude hikes early; brewery courtyards cover afternoon thunderstorms.

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Did you know?

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Travel Tips

01Best time & timing
Target September, June, August — that is where comfort scores peak (9.9/10). January is the weakest month at 6.3/10.
02Weather & what to pack
September averages 19°C with 26 mm of rain and about 29 days with 6+ hours of sunshine. Pack light clothing, a hat and real sun protection.
03Crowds & value
If budget matters, target June — 9.4/10 with lighter demand than August.

Things to do in Denver

Denver, United States. Live activities and tours from GetYourGuide, matched to this destination.

When to visit Denver: the short answer

Plan Denver for September, with June, August close behind — the stretch with the most usable temperatures and the fewest lost days to rain: September averages 19°C with 26 mm of rain and about 29 days with 6+ hours of sunshine. The months to avoid unless you have a specific reason are January, February. If budget matters more than perfect weather, March is the strongest of the low-rate months at 7.3/10.

Across the year Denver swings from -4°C in January to 24°C in July, a 28-degree spread, while rainfall ranges from 16 mm in December to 87 mm in May. In short, Denver is not equally good year-round — the gap between its best and worst month is 3.6 points on the same 10-point scale.

Warmest month: July (24°C). Coolest: January (-4°C). Driest: December (16 mm). Wettest: May (87 mm).

Denver month by month

January in Denver — workable with trade-offs

Trade-offs · 6.3/10

At -4°C (25°F) this is proper winter weather in January: layer up and split the day between outdoor highlights and indoor stops.

Only 22 mm of water-equivalent precipitation is expected (snow at altitude), leaving about 25 days with 6+ hours of sunshine and 9.7 hours of daylight.

That is 6.3/10 on the same scale — 12th of 12 months, versus 9.9/10 for the best month here.

Budget for low-season pricing, and crowds are light for this destination.

Pack insulated layers, a windproof shell, gloves and boots with grip.

If your dates are flexible, September is materially better in Denver — 3.6 points higher on the same scale.

February in Denver: mixed conditions, plan around the weather

Trade-offs · 6.6/10

At -3°C (27°F) this is proper winter weather in February: layer up and split the day between outdoor highlights and indoor stops.

Only 30 mm of water-equivalent precipitation is expected (snow at altitude), leaving about 26 days with 6+ hours of sunshine and 10.7 hours of daylight.

That is 6.6/10 on the same scale — 11th of 12 months, versus 9.9/10 for the best month here.

Expect low-season pricing, and crowds are light for this destination.

Pack insulated layers, a windproof shell, gloves and boots with grip.

If your dates are flexible, September is materially better in Denver — 3.3 points higher on the same scale.

March in Denver: strong conditions, 9th of 12

Good · 7.3/10

March averages 3°C (37°F), cold enough that sightseeing works in bursts rather than in one long day on foot.

Rainfall runs 50 mm, so plan one flexible day in three; you still get about 28 days with 6+ hours of sunshine and 12 hours of daylight.

It scores 7.3/10 here, 9th of 12 months, against 9.9/10 in the destination's best month.

Plan for low-season pricing, with crowds are light for this destination.

Pack insulated layers, a windproof shell, gloves and boots with grip, a packable rain layer.

Flexible dates? September scores 2.6 points higher here — enough to change the trip.

April is one of the strongest months in Denver (6th)

Best window · 8.6/10

Expect 8°C (47°F) in April. A good month for city streets, viewpoints and long meals; leave swimming for another season.

With around 38 mm of rain, any showers tend to pass through rather than settle in; about 27 days with 6+ hours of sunshine and 13.3 hours of daylight fill the rest.

On our climate-comfort scale this is one of the strongest months of the year for Denver at 8.6/10 (6th of 12), just behind September at 9.9/10.

Expect mid-season pricing, and crowds are moderate.

Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in.

May is one of the strongest months in Denver (7th)

Best window · 8.5/10

May averages 14°C (57°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.

Rainfall runs 87 mm, so plan one flexible day in three; you still get about 26 days with 6+ hours of sunshine and 14.4 hours of daylight.

A 8.5/10 puts this among the year's best months in Denver (7th of 12); only September scores higher, at 9.9/10.

Figure on mid-season pricing, with crowds are moderate.

Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.

June in Denver — one of the year's strongest windows (2nd)

Best window · 9.4/10

At 21°C (69°F) this is comfortable city weather in June, with sightseeing easiest before lunch and after the afternoon peak.

Budget for roughly 56 mm of rain this month — a flexible day or two helps — with about 29 days with 6+ hours of sunshine and 14.9 hours of daylight to work around it.

On our climate-comfort scale this is one of the strongest months of the year for Denver at 9.4/10 (2nd of 12), just behind September at 9.9/10.

Budget for mid-season pricing, and crowds are moderate.

Pack light clothing, a hat and real sun protection, a packable rain layer.

July ranks 5th of 12 for Denver — one of the best windows

Best window · 9.1/10

At 24°C (75°F) this is comfortable city weather in July, with sightseeing easiest before lunch and after the afternoon peak.

With around 25 mm of rain, any showers tend to pass through rather than settle in; about 31 days with 6+ hours of sunshine and 14.7 hours of daylight fill the rest.

On our climate-comfort scale this is one of the strongest months of the year for Denver at 9.1/10 (5th of 12), just behind September at 9.9/10.

Expect peak pricing, and this is one of the busiest months here.

Pack light clothing, a hat and real sun protection.

August is one of the strongest months in Denver (3rd)

Best window · 9.2/10

August averages 23°C (74°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.

Expect 42 mm of rain — occasional showers rather than washed-out days — alongside about 30 days with 6+ hours of sunshine and 13.7 daylight hours.

A 9.2/10 puts this among the year's best months in Denver (3rd of 12); only September scores higher, at 9.9/10.

Plan for peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack light clothing, a hat and real sun protection.

September: the best month of the year in Denver

Best window · 9.9/10

September averages 19°C (67°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.

Expect 26 mm of rain — occasional showers rather than washed-out days — alongside about 29 days with 6+ hours of sunshine and 12.4 daylight hours.

On our climate-comfort scale this is the top-ranked month of the year for Denver at 9.9/10 — the reference point every other month on this page is measured against.

Plan for peak pricing, with crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack light clothing, a hat and real sun protection.

October is one of the strongest months in Denver (4th)

Best window · 9.2/10

Expect 12°C (53°F) in October. A good month for city streets, viewpoints and long meals; leave swimming for another season.

With around 21 mm of rain, any showers tend to pass through rather than settle in; about 29 days with 6+ hours of sunshine and 11.1 hours of daylight fill the rest.

On our climate-comfort scale this is one of the strongest months of the year for Denver at 9.2/10 (4th of 12), just behind September at 9.9/10.

Expect mid-season pricing, and crowds are moderate.

Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in.

November in Denver: strong conditions, 8th of 12

Good · 7.7/10

Expect 4°C (39°F) in November. A good month for city streets, viewpoints and long meals; leave swimming for another season.

With around 18 mm of rain, any showers tend to pass through rather than settle in; about 26 days with 6+ hours of sunshine and 10 hours of daylight fill the rest.

That is 7.7/10 on the same scale — 8th of 12 months, versus 9.9/10 for the best month here.

Expect mid-season pricing, and crowds are moderate.

Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in.

If your dates are flexible, September is materially better in Denver — 2.2 points higher on the same scale.

December holds up well in Denver — 10th best month

Good · 7.1/10

December averages 1°C (34°F), cold enough that sightseeing works in bursts rather than in one long day on foot.

Expect 16 mm of rain — occasional showers rather than washed-out days — alongside about 28 days with 6+ hours of sunshine and 9.4 daylight hours.

It scores 7.1/10 here, 10th of 12 months, against 9.9/10 in the destination's best month.

Figure on mid-season pricing, with crowds are light for this destination.

Pack insulated layers, a windproof shell, gloves and boots with grip.

Flexible dates? September scores 2.8 points higher here — enough to change the trip.

FAQ

Frequently asked

When is the best time to visit Denver, United States?
In Ideal Weather mode, the best months to visit Denver are September, June, August, October, July. September is the single peak month with an Ideal Weather score of 9.9/10 based on temperature, rainfall, humidity, daylight and days with 6+ hours of sunshine.
What is the weather like in Denver year-round?
Denver has a climate profile suited to sightseeing and cultural travel. Average monthly temperatures range from -4°C in January to 24°C in July, with Ideal Weather scores between 6.3 and 9.9 out of 10.
Which months should I avoid in Denver?
The lowest Ideal Weather-scoring months in Denver are January (6.3/10), February (6.6/10), December (7.1/10). These months typically combine less comfortable temperatures, higher rainfall or fewer days with 6+ hours of sunshine.
When is the rainy season in Denver?
May is the wettest month in Denver, averaging about 87 mm of rainfall. December is the driest, at roughly 16 mm.
Which is the sunniest month in Denver?
July sees the most sun in Denver, with about 31 days with 6+ hours of sunshine on average - ideal for outdoor plans.
Is Denver a good destination for sightseeing and cultural travel?
Denver is well suited to sightseeing and cultural travel. Its highest Ideal Weather window (September, June, August, October, July) aligns with the conditions travelers usually look for in this style of trip.
How is the bestime.to score for Denver calculated?
Each month receives an Ideal Weather score from 0-10 using ERA5 climate normals for Denver: temperature comfort, precipitation, humidity, daylight hours, and days with 6+ hours of sunshine - weighted for sightseeing and cultural travel.

Climate data: Open-Meteo ERA5 historical archive, the five most recent complete years (2021–2025). Scores are monthly averages for that window, not forecasts, and short-window precipitation can differ from longer-term normals. “Sunny days” count days with at least 6 hours of measured sunshine — they are not dry days.

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