Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 23°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Monday
11th May
23

10

12

7
Tuesday
12th May
24

10

14

7
Wednesday
13th May
30

10

9

6
Thursday
14th May
17

8

13

7
Friday
15th May
21

8

7

7

5-day weather forecast updated at 04:02 on Tuesday 12th 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 Monday 11th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 23°C, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 32 kph from the north-west.

23
°C maximum temperature
10
°C minimum temperature
scattered clouds
12
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
23
°C wind chill
32
kph wind from NW

Lewistown weather for Tuesday 12th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 24°C, maximum UV of 7 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south-east.

24
°C maximum temperature
10
°C minimum temperature
scattered clouds
14
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
24
°C wind chill
14
kph wind from SE

Lewistown weather for Wednesday 13th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 30°C, low levels of heat & humidity, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 37% chance of some rain and a fresh breeze of 32 kph from the west.

30
°C maximum temperature
10
°C minimum temperature
isolated thunderstorms
9
hours of sunshine
6
UV index (High)
37
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
32
kph wind from W

Lewistown weather for Thursday 14th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 17°C, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a strong breeze of 51 kph from the west.

17
°C maximum temperature
8
°C minimum temperature
scattered clouds
13
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
17
°C wind chill
51
kph wind from W

Lewistown weather for Friday 15th May 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 21°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 31 kph from the west.