Great Falls weather by month

Check out Great Falls weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature
Rainfall
Sunshine & daylight
UV levels & humidity

Temperature in Great Falls (°F)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	28	37	43	55	64	73	82	82	70	59	45	32
Min temperature (night-time)	10	18	21	32	41	48	54	52	43	36	23	14
Heat & Humidity	0	0	0	0	0	0	L	L	0	0	0	0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & Daylight in Great Falls

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daily hours of sunshine	4	5	8	8	9	11	12	11	8	6	4	3
Daily hours of daylight	9	10	12	14	15	16	15	14	13	11	9	9
UV Index (Maximum)	1	2	3	5	6	8	8	7	5	3	1	1

Rainfall in Great Falls

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Number of days with some rain	9	7	9	9	12	11	7	8	7	5	6	9
Average monthly rainfall (inches)	0.8	0.6	0.9	1.2	2.5	2.8	1.3	1.4	1.0	0.7	0.6	0.7

More about Great Falls

Great Falls by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Montana

Candlewood Suites: Current hotel offers & deals

Sale

Browse latest deals & discounts on Candlewood Suites
Save with hotel offers, package deals & more
Book hotels in the USA, Canada, Mexico & beyond

Go to Candlewood Suites deal >>

The climate guide for Montana (Great Falls) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Great Falls?

Great Falls has a cold semi arid climate with warm summers.

Great Falls weather in January

Expect daytime maximum temperatures of 28°F in Great Falls, Montana in January based on long-term weather averages. There are 4 hours of sunshine per day on average, which might fall as snow.

28
28°F max day temperature
4
4 hours of sunshine per day
9
9 days with some rainfall
10
10°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
0.8
0.8 inches of monthly rainfall
1
1 (Low) UV index

Back to months

Great Falls weather in February

Expect daytime maximum temperatures of 37°F in Great Falls, Montana in February based on long-term weather averages. There are 5 hours of sunshine per day on average, which might fall as snow.

37
37°F max day temperature
5
5 hours of sunshine per day
7
7 days with some rainfall
18
18°F min night temperature
10
10 hours of daylight per day
0
No heat & humidity
0.6
0.6 inches of monthly rainfall
2
2 (Low) UV index

Back to months

Great Falls weather in March

Expect daytime maximum temperatures of 43°F in Great Falls, Montana in March based on long-term weather averages. There are 8 hours of sunshine per day on average, which might fall as snow.

43
43°F max day temperature
8
8 hours of sunshine per day
9
9 days with some rainfall
21
21°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
0.9
0.9 inches of monthly rainfall
3
3 (Moderate) UV index

Back to months

Great Falls weather in April

Expect daytime maximum temperatures of 55°F in Great Falls, Montana in April based on long-term weather averages. There are 8 hours of sunshine per day on average.

55
55°F max day temperature
8
8 hours of sunshine per day
9
9 days with some rainfall
32
32°F min night temperature
14
14 hours of daylight per day
0
No heat & humidity
1.2
1.2 inches of monthly rainfall
5
5 (Moderate) UV index

Back to months

Great Falls weather in May

Expect daytime maximum temperatures of 64°F in Great Falls, Montana in May based on long-term weather averages. There are 9 hours of sunshine per day on average with 12 days with some rainfall and typically 2.5 inches of rainfall in the month.

64
64°F max day temperature
9
9 hours of sunshine per day
12
12 days with some rainfall
41
41°F min night temperature
15
15 hours of daylight per day
0
No heat & humidity
2.5
2.5 inches of monthly rainfall
6
6 (High) UV index

Back to months

Great Falls weather in June

Expect daytime maximum temperatures of 73°F in Great Falls, Montana in June based on long-term weather averages. There are 11 hours of sunshine per day on average with 11 days with some rainfall and typically 2.8 inches of rainfall in the month.

73
73°F max day temperature
11
11 hours of sunshine per day
11
11 days with some rainfall
48
48°F min night temperature
16
16 hours of daylight per day
0
No heat & humidity
2.8
2.8 inches of monthly rainfall
8
8 (Very High) UV index

Back to months

Great Falls weather in July

Expect daytime maximum temperatures of 82°F in Great Falls, Montana in July based on long-term weather averages. There are 12 hours of sunshine per day on average.

82
82°F max day temperature
12
12 hours of sunshine per day
7
7 days with some rainfall
54
54°F min night temperature
15
15 hours of daylight per day
L
Low heat & humidity
1.3
1.3 inches of monthly rainfall
8
8 (Very High) UV index

Back to months

Great Falls weather in August

Expect daytime maximum temperatures of 82°F in Great Falls, Montana in August based on long-term weather averages. There are 11 hours of sunshine per day on average.

82
82°F max day temperature
11
11 hours of sunshine per day
8
8 days with some rainfall
52
52°F min night temperature
14
14 hours of daylight per day
L
Low heat & humidity
1.4
1.4 inches of monthly rainfall
7
7 (High) UV index

Back to months

Great Falls weather in September

Expect daytime maximum temperatures of 70°F in Great Falls, Montana in September based on long-term weather averages. There are 8 hours of sunshine per day on average.

70
70°F max day temperature
8
8 hours of sunshine per day
7
7 days with some rainfall
43
43°F min night temperature
13
13 hours of daylight per day
0
No heat & humidity
1.0
1.0 inches of monthly rainfall
5
5 (Moderate) UV index

Back to months

Great Falls weather in October

Expect daytime maximum temperatures of 59°F in Great Falls, Montana in October based on long-term weather averages. There are 6 hours of sunshine per day on average.

59
59°F max day temperature
6
6 hours of sunshine per day
5
5 days with some rainfall
36
36°F min night temperature
11
11 hours of daylight per day
0
No heat & humidity
0.7
0.7 inches of monthly rainfall
3
3 (Moderate) UV index

Back to months

Great Falls weather in November

Expect daytime maximum temperatures of 45°F in Great Falls, Montana in November based on long-term weather averages. There are 4 hours of sunshine per day on average, which might fall as snow.

45
45°F max day temperature
4
4 hours of sunshine per day
6
6 days with some rainfall
23
23°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
0.6
0.6 inches of monthly rainfall
1
1 (Low) UV index

Back to months

Great Falls weather in December

Expect daytime maximum temperatures of 32°F in Great Falls, Montana in December based on long-term weather averages. There are 3 hours of sunshine per day on average, which might fall as snow.

32
32°F max day temperature
3
3 hours of sunshine per day
9
9 days with some rainfall
14
14°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
0.7
0.7 inches of monthly rainfall
1
1 (Low) UV index

Back to months