Helena weather by month

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

Temperature
Rainfall
Sunshine & daylight
UV levels & humidity

Temperature in Helena (°C)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	-1	3	6	12	18	23	28	28	20	14	5	0
Min temperature (night-time)	-13	-10	-6	-2	3	8	10	9	4	-1	-7	-12
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 Helena

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daily hours of sunshine	4	5	7	8	9	10	12	10	8	7	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	7	8	9	8	5	3	1	1

Rainfall in Helena

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Number of days with some rain	9	7	10	9	11	10	7	8	7	6	8	9
Average monthly rainfall (mm)	17	12	21	28	51	55	33	34	30	19	16	16

More about Helena

Helena by month

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

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The climate guide for Montana (Helena) 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 Helena?

Helena has a cold semi arid climate with warm summers.

Helena weather in January

Expect daytime maximum temperatures of -1°C in Helena, Montana in January based on long-term weather averages. There are 4 hours of sunshine per day on average, which might fall as snow.

-1
-1°C max day temperature
4
4 hours of sunshine per day
9
9 days with some rainfall
-13
-13°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
17
17 mm of monthly rainfall
1
1 (Low) UV index

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Helena weather in February

Expect daytime maximum temperatures of 3°C in Helena, Montana in February based on long-term weather averages. There are 5 hours of sunshine per day on average, which might fall as snow.

3
3°C max day temperature
5
5 hours of sunshine per day
7
7 days with some rainfall
-10
-10°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
12
12 mm of monthly rainfall
2
2 (Low) UV index

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Helena weather in March

Expect daytime maximum temperatures of 6°C in Helena, Montana in March based on long-term weather averages. There are 7 hours of sunshine per day on average with 10 days with some rainfall, which might fall as snow.

6
6°C max day temperature
7
7 hours of sunshine per day
10
10 days with some rainfall
-6
-6°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
21
21 mm of monthly rainfall
3
3 (Moderate) UV index

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Helena weather in April

Expect daytime maximum temperatures of 12°C in Helena, Montana in April based on long-term weather averages. There are 8 hours of sunshine per day on average.

12
12°C max day temperature
8
8 hours of sunshine per day
9
9 days with some rainfall
-2
-2°C min night temperature
14
14 hours of daylight per day
0
No heat & humidity
28
28 mm of monthly rainfall
5
5 (Moderate) UV index

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Helena weather in May

Expect daytime maximum temperatures of 18°C in Helena, Montana in May based on long-term weather averages. There are 9 hours of sunshine per day on average with 11 days with some rainfall and typically 51 mm of rainfall in the month.

18
18°C max day temperature
9
9 hours of sunshine per day
11
11 days with some rainfall
3
3°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
51
51 mm of monthly rainfall
7
7 (High) UV index

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Helena weather in June

Expect daytime maximum temperatures of 23°C in Helena, Montana in June based on long-term weather averages. There are 10 hours of sunshine per day on average with 10 days with some rainfall and typically 55 mm of rainfall in the month.

23
23°C max day temperature
10
10 hours of sunshine per day
10
10 days with some rainfall
8
8°C min night temperature
16
16 hours of daylight per day
0
No heat & humidity
55
55 mm of monthly rainfall
8
8 (Very High) UV index

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Helena weather in July

Expect daytime maximum temperatures of 28°C in Helena, Montana in July based on long-term weather averages. There are 12 hours of sunshine per day on average.

28
28°C max day temperature
12
12 hours of sunshine per day
7
7 days with some rainfall
10
10°C min night temperature
15
15 hours of daylight per day
L
Low heat & humidity
33
33 mm of monthly rainfall
9
9 (Very High) UV index

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Helena weather in August

Expect daytime maximum temperatures of 28°C in Helena, Montana in August based on long-term weather averages. There are 10 hours of sunshine per day on average.

28
28°C max day temperature
10
10 hours of sunshine per day
8
8 days with some rainfall
9
9°C min night temperature
14
14 hours of daylight per day
L
Low heat & humidity
34
34 mm of monthly rainfall
8
8 (Very High) UV index

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Helena weather in September

Expect daytime maximum temperatures of 20°C in Helena, Montana in September based on long-term weather averages. There are 8 hours of sunshine per day on average.

20
20°C max day temperature
8
8 hours of sunshine per day
7
7 days with some rainfall
4
4°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
30
30 mm of monthly rainfall
5
5 (Moderate) UV index

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Helena weather in October

Expect daytime maximum temperatures of 14°C in Helena, Montana in October based on long-term weather averages. There are 7 hours of sunshine per day on average.

14
14°C max day temperature
7
7 hours of sunshine per day
6
6 days with some rainfall
-1
-1°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
19
19 mm of monthly rainfall
3
3 (Moderate) UV index

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Helena weather in November

Expect daytime maximum temperatures of 5°C in Helena, Montana in November based on long-term weather averages. There are 4 hours of sunshine per day on average, which might fall as snow.

5
5°C max day temperature
4
4 hours of sunshine per day
8
8 days with some rainfall
-7
-7°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
16
16 mm of monthly rainfall
1
1 (Low) UV index

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Helena weather in December

Expect daytime maximum temperatures of 0°C in Helena, Montana in December based on long-term weather averages. There are 3 hours of sunshine per day on average, which might fall as snow.

0
0°C max day temperature
3
3 hours of sunshine per day
9
9 days with some rainfall
-12
-12°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
16
16 mm of monthly rainfall
1
1 (Low) UV index

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