The biggest temperature swing occurs between September and October, with a change of 7.6°C / 45.7°F.
| Month | Low Temperature | High Temperature | Category |
|---|---|---|---|
| January | -9.2°C | 5°C | COLD |
| February | -9°C | 6°C | COLD |
| March | -4.8°C | 11°C | COOL |
| April | -0.4°C | 14.9°C | COOL |
| May | 5.4°C | 20.2°C | MILD |
| June | 11.5°C | 27°C | WARM |
| July | 15.1°C | 30.3°C | HOT |
| August | 14.4°C | 29.1°C | WARM |
| September | 10°C | 25.2°C | WARM |
| October | 2.8°C | 17.6°C | MILD |
| November | -4°C | 10.5°C | COOL |
| December | -8.7°C | 5.2°C | COLD |
May is wettest at 83.7 mm / 3.29 inches, while December is driest at 20.7 mm / 0.82 inches.
| Month | Baseline | Rainfall | Category |
|---|---|---|---|
| January | 0 mm | 21.6 mm | LIGHT |
| February | 0 mm | 24 mm | LIGHT |
| March | 0 mm | 46.1 mm | LIGHT |
| April | 0 mm | 66.2 mm | MODERATE |
| May | 0 mm | 83.7 mm | MODERATE |
| June | 0 mm | 47.1 mm | LIGHT |
| July | 0 mm | 36.1 mm | LIGHT |
| August | 0 mm | 36.5 mm | LIGHT |
| September | 0 mm | 33.9 mm | LIGHT |
| October | 0 mm | 37.1 mm | LIGHT |
| November | 0 mm | 24.8 mm | LIGHT |
| December | 0 mm | 20.7 mm | LIGHT |
June has the strongest UV (about index 8.8), rated very high.
| Month | Baseline | UV Index | Category |
|---|---|---|---|
| January | 0 | 3.9 | MODERATE |
| February | 0 | 5.5 | MODERATE |
| March | 0 | 6.8 | HIGH |
| April | 0 | 8.1 | VERY HIGH |
| May | 0 | 8.6 | VERY HIGH |
| June | 0 | 8.8 | VERY HIGH |
| July | 0 | 8.8 | VERY HIGH |
| August | 0 | 8.3 | VERY HIGH |
| September | 0 | 7.4 | HIGH |
| October | 0 | 6 | MODERATE |
| November | 0 | 4.4 | MODERATE |
| December | 0 | 3.2 | MODERATE |
Daylight ranges from 9.4h in December to 14.9h in June, a 5.5h difference.
| Month | Baseline | Daylight Hours | Category |
|---|---|---|---|
| January | 0h | 9.7h | SHORT |
| February | 0h | 10.7h | BALANCED |
| March | 0h | 12h | BALANCED |
| April | 0h | 13.3h | LONG |
| May | 0h | 14.4h | LONG |
| June | 0h | 14.9h | LONG |
| July | 0h | 14.7h | LONG |
| August | 0h | 13.7h | LONG |
| September | 0h | 12.4h | BALANCED |
| October | 0h | 11.1h | BALANCED |
| November | 0h | 10h | SHORT |
| December | 0h | 9.4h | SHORT |
Daylight varies from 9.4 hours in December (winter) to 14.9 hours in June (summer), which is a difference of 5.5 hours.
Northern Hemisphere seasons shape the weather patterns throughout the year. Here's what to expect in each season:
Click any month for detailed weather information and packing advice.
Get personalized month rankings based on weather comfort, outdoor activity suitability, and seasonal conditions.
View Best Time to VisitThe best months to visit Denver depend on your preferences. For warm weather, July is typically the warmest month. For dry conditions, December, January, February tend to have the least rainfall. Consider your priorities, and whether you prefer warmer temperatures, drier weather, or longer daylight hours.
July is typically the warmest month in Denver, with average high temperatures reaching around 30°C (86°F). This is peak summer weather, ideal for outdoor activities and sightseeing.
January is usually the coldest month, with average low temperatures dropping to around -9°C (16°F). Pack warm layers if visiting during this time, especially for evening activities.
May typically sees the most rainfall in Denver, averaging around 84mm (3.3 inches). It's wise to pack waterproof layers and have some indoor backup plans if you're visiting during this month.
December is typically the driest month, with average rainfall of just 21mm (0.8 inches). This makes it an excellent time for outdoor exploration and activities with minimal risk of rain disruption.
Temperatures in Denver range from average lows of 2°C (35°F) to highs of 17°C (62°F). This variation means you'll want to pack differently depending on when you visit, as layers are key for adapting to the seasonal changes.
Yes, sun protection is important in Denver. UV levels can reach 9 during peak months, which is considered very high. Pack sunscreen (SPF 30+), sunglasses, and a hat, especially if you'll be outdoors for extended periods.