Boulder weather in August 2025

The temperatures in Boulder in August are comfortable with low of 13°C and and high up to 25°C.

You can expect about 3 to 8 days of rain in Boulder during the month of August. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.

Our weather forecast can give you a great sense of what weather to expect in Boulder in August 2025.

If you’re planning to visit Boulder in the near future, we highly recommend that you review the 14 day weather forecast for Boulder before you arrive.

Temperatures

25° / 13°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

11.9

Hrs

Sun	Mon	Tue	Wed	Thu	Fri	Sat
					1 28° /16°	2 29° /17°
3 30° /17°	4 31° /18°	5 30° /17°	6 27° /15°	7 29° /15°	8 26° /14°	9 27° /15°
10 29° /17°	11 31° /17°	12 29° /18°	13 28° /17°	14 27° /15°	15 28° /15°	16 28° /16°
17 31° /18°	18 30° /18°	19 26° /14°	20 28° /15°	21 28° /15°	22 28° /17°	23 28° /17°
24 28° /17°	25 27° /16°	26 24° /14°	27 28° /15°	28 26° /15°	29 25° /13°	30 29° /14°
31 30° /17°

Explore the weather in Boulder in other months

Boulder annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	2° / -8°	4	16	10	27 mm	Awful	Boulder in January
February	1° / -8°	4	10	14	54 mm	Awful	Boulder in February
March	7° / -3°	4	17	10	83 mm	Bad	Boulder in March
April	11° / 0°	6	17	7	95 mm	Bad	Boulder in April
May	15° / 5°	11	17	3	160 mm	Bad	Boulder in May
June	23° / 12°	7	23	0	89 mm	Good	Boulder in June
July	26° / 15°	8	23	0	115 mm	Good	Boulder in July
August	25° / 13°	5	26	0	75 mm	Perfect	Boulder in August
September	21° / 10°	4	25	0	66 mm	Good	Boulder in September
October	13° / 2°	3	24	4	47 mm	Bad	Boulder in October
November	7° / -3°	2	21	7	33 mm	Bad	Boulder in November
December	1° / -8°	5	15	11	30 mm	Awful	Boulder in December