When is the best time to go to Boulder
The chart above shows the best time of year to visit Boulder, United States. These are based on an analysis of weather averages such as temperature, rainfall and number of hours of sunshine. These ratings are based solely on the climate and do not take into account other factors such as accommodation prices and how busy it is likely to be.
Average temperatures in Boulder
Boulder weather by month
Please note our recommendations for when to visit Boulder are based solely on the weather and do not take into accounts accommodation prices, how busy it will be and what events are on.
January
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 5°C | 17mm | 7.4hrs | 10.7hrs |
January is a dry month in Boulder and the temperature is generally cold.
Based on weather alone, this is probably a time of year to avoid going to Boulder for your holidays. The weather is often not a good and not conducive to spending time outdoors.
January is in the winter in Boulder and is typically the coldest month of the year. Daytime maximum temperatures average around a freezing 6°C (43°F), whilst at night -9°C (16°F) is normal.
On average January is the driest month of the year in Boulder with around 17mm 0.6 inches of rain making it a dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.4 hours of sunshine per day.
February
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 7°C | 19mm | 8.1hrs | 11.6hrs |
February in Boulder is generally dry with the temperature being cool.
Based on weather alone, this is probably a time of year to avoid going to Boulder for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
February is in the winter in Boulder and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cold 8°C (46°F), whilst at night -7°C (20°F) is normal.
On average February is the 2nd driest month of the year in Boulder with around 19mm 0.7 inches of rain making it a dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.1 hours of sunshine per day.
March
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 10°C | 41mm | 8.8hrs | 12.8hrs |
The weather in March in Boulder is characteristically cool and reasonably dry.
Based on weather alone, this is probably a time of year to avoid going to Boulder for your holidays. The weather is often not a good and not conducive to spending time outdoors.
March is in the spring in Boulder and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a cold 11°C (51°F), whilst at night -4°C (24°F) is normal.
On average March is the 3rd driest month of the year in Boulder with around 41mm 1.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.8 hours of sunshine per day.
April
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 14°C | 55mm | 9.8hrs | 14.2hrs |
Boulder's weather in April is typically cool and reasonably dry in nature.
Although outside the main holiday season, there is still plenty of quite acceptable weather around this time of year. This makes it an okay time to visit Boulder.
April is in the spring in Boulder and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a cool 16°C (60°F), whilst at night 0°C (33°F) is normal.
On average April is the 4th driest month of the year in Boulder with around 55mm 2.2 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.8 hours of sunshine per day.
May
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 19°C | 78mm | 10.1hrs | 15.3hrs |
May is a reasonably dry month in Boulder and the temperature is generally mild.
Although outside the main holiday season, there is still plenty of quite acceptable weather around this time of year. This makes it an okay time to visit Boulder.
May is in the spring in Boulder and is typically the 5th coldest month of the year. Daytime maximum temperatures average around 21°C (69°F), whilst at night 6°C (42°F) is normal.
On average May is the 5th driest month of the year in Boulder with around 78mm 3.1 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 10.1 hours of sunshine per day.
June
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 23°C | 51mm | 11.1hrs | 10.7hrs |
Boulder's weather in June is typically mild and reasonably dry in nature.
It is perhaps the perfect month to visit Boulder, with some extremely good weather at this time of year.
June is in the summer in Boulder and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a comfortable 26°C (79°F), whilst at night 10°C (50°F) is normal.
On average June is the 6th driest month of the year in Boulder with around 51mm 2 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 11.1 hours of sunshine per day.
July
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 27°C | 47mm | 11.1hrs | 11.6hrs |
July in Boulder is generally reasonably dry with the temperature being warm.
It is perhaps the perfect month to visit Boulder, with some particularly good weather at this time of year.
July is in the summer in Boulder and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a comfortable 30°C (85°F), whilst at night 13°C (56°F) is normal.
On average July is the 6th wettest month of the year in Boulder with around 47mm 1.8 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 11.1 hours of sunshine per day.
August
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 25°C | 36mm | 10.5hrs | 12.8hrs |
The weather in August in Boulder is characteristically warm and reasonably dry.
It is perhaps the perfect month to visit Boulder, with some very good weather at this time of year.
August is in the summer in Boulder and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a comfortable 28°C (83°F), whilst at night 12°C (54°F) is normal.
On average August is the 5th wettest month of the year in Boulder with around 36mm 1.4 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 10.5 hours of sunshine per day.
September
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 21°C | 40mm | 9.6hrs | 14.2hrs |
Boulder's weather in September is typically mild and reasonably dry in nature.
It is perhaps the perfect month to visit Boulder, with some particularly good weather at this time of year.
September is in the fall / autumn in Boulder and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (74°F), whilst at night 8°C (46°F) is normal.
On average September is the 4th wettest month of the year in Boulder with around 40mm 1.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.6 hours of sunshine per day.
Boulder weather in September »
October
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 16°C | 31mm | 8.6hrs | 15.3hrs |
October is a reasonably dry month in Boulder and the temperature is generally mild.
Although outside the main holiday season, there is still plenty of relatively acceptable weather around this time of year. This makes it an okay time to visit Boulder.
October is in the fall / autumn in Boulder and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a cool 18°C (65°F), whilst at night 2°C (36°F) is normal.
On average October is the 3rd wettest month of the year in Boulder with around 31mm 1.2 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.6 hours of sunshine per day.
November
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 9°C | 31mm | 7hrs | 10.7hrs |
Boulder's weather in November is typically cool and reasonably dry in nature.
Based on weather alone, this is probably a time of year to avoid going to Boulder for your holidays. The weather is often not a good and not conducive to spending time outdoors.
November is in the fall / autumn in Boulder and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a cold 11°C (51°F), whilst at night -4°C (25°F) is normal.
On average November is the 2nd wettest month of the year in Boulder with around 31mm 1.2 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.
On the flip side this corresponds to an average of 7 hours of sunshine per day.
December
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 6°C | 19mm | 6.9hrs | 11.6hrs |
December in Boulder is generally dry with the temperature being cold.
Based on weather alone, this is probably a time of year to avoid going to Boulder for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
December is in the winter in Boulder and is typically the warmest month of the year. Daytime maximum temperatures average around a freezing 7°C (44°F), whilst at night -7°C (19°F) is normal.
On average December is the wettest month of the year in Boulder with around 19mm 0.7 inches of rain making it a dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.9 hours of sunshine per day.
Other monthly averages
Boulder weather stats
| Hottest month: | July | 29.2°C 84.6°F |
|---|---|---|
| Driest month: | January | 17mm 0.7ins |
| Sunniest month: | September | 9.6hrs |
| Coldest month: | January | 5.5°C 41.9°F |
| Wettest month: | May | 78mm 3.1ins |
| Warmest sea: | August | 18.4°C 65.1°F |
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