Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 19°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Tuesday
15th Sep
19

6

6

5
Wednesday
16th Sep
17

5

5

3
Thursday
17th Sep
25

6

10

5
Friday
18th Sep
19

10

5

5
Saturday
19th Sep
20

9

5

5

5-day weather forecast updated at 04:03 on Tuesday 15th September 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 Tuesday 15th September 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 19°C, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the east.

19
°C maximum temperature
6
°C minimum temperature
broken clouds
6
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
19
°C wind chill
23
kph wind from E

Lewistown weather for Wednesday 16th September 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 17°C, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north-west.

17
°C maximum temperature
5
°C minimum temperature
broken clouds
5
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
14
kph wind from NW

Lewistown weather for Thursday 17th September 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

25
°C maximum temperature
6
°C minimum temperature
scattered clouds
10
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
25
°C wind chill
11
kph wind from SE

Lewistown weather for Friday 18th September 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 19°C, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 86% chance of some rain and a light breeze of 12 kph from the north-west.

19
°C maximum temperature
10
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
5
UV index (Moderate)
86
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
12
kph wind from NW

Lewistown weather for Saturday 19th September 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 39% chance of some rain and a light breeze of 9 kph from the west.