Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 18°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Thursday
14th May
18

7

12

7
Friday
15th May
17

3

10

6
Saturday
16th May
16

3

1

5
Sunday
17th May
10

0

0

5
Monday
18th May
9

0

1

5

5-day weather forecast updated at 04:02 on Thursday 14th May 2026 GMT

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The 5-day weather forecast for Montana (Lewistown) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Lewistown weather forecast by day

Below are the detailed weather forecasts for Lewistown for the next 5 days.

Lewistown weather for Thursday 14th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 18°C, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate gale of 52 kph from the west.

18
°C maximum temperature
7
°C minimum temperature
scattered clouds
12
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
52
kph wind from W

Lewistown weather for Friday 15th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 17°C, maximum UV of 6 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a strong breeze of 43 kph from the west.

17
°C maximum temperature
3
°C minimum temperature
scattered clouds
10
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
43
kph wind from W

Lewistown weather for Saturday 16th May 2026

Expect mostly cloudy with light rain in Lewistown, Montana with a maximum temperature of 16°C, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 70% chance of some rain and a gentle breeze of 18 kph from the north-west.

16
°C maximum temperature
3
°C minimum temperature
mostly cloudy with light rain
1
hour of sunshine
5
UV index (Moderate)
70
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
18
kph wind from NW

Lewistown weather for Sunday 17th May 2026

Expect mostly cloudy with light rain in Lewistown, Montana with a maximum temperature of 10°C, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 72% chance of some rain and a fresh breeze of 30 kph from the north-west.

10
°C maximum temperature
0
°C minimum temperature
mostly cloudy with light rain
0
hours of sunshine
5
UV index (Moderate)
72
% chance of some rain
<5
mm of rainfall expected
6
°C wind chill
30
kph wind from NW

Lewistown weather for Monday 18th May 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 9°C, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 29 kph from the north-west.