Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 30°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Thursday
28th May
30

14

7

6
Friday
29th May
30

13

9

7
Saturday
30th May
22

12

4

5
Sunday
31st May
17

9

3

2
Monday
1st Jun
19

9

6

8

5-day weather forecast updated at 04:02 on Thursday 28th 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 28th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 14% chance of some rain and a light breeze of 10 kph from the south-east.

30
°C maximum temperature
14
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
6
UV index (High)
14
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
10
kph wind from SE

Lewistown weather for Friday 29th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 53% chance of some rain and a light breeze of 9 kph from the south.

30
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
9
hours of sunshine
7
UV index (High)
53
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
9
kph wind from S

Lewistown weather for Saturday 30th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 22°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 10-20 mm of rainfall expected with 92% chance of some rain and a moderate breeze of 20 kph from the north-west.

22
°C maximum temperature
12
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
5
UV index (Moderate)
92
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
20
kph wind from NW

Lewistown weather for Sunday 31st May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 17°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 80% chance of some rain and a moderate breeze of 26 kph from the west.

17
°C maximum temperature
9
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
2
UV index (Low)
80
% chance of some rain
<20
mm of rainfall expected
17
°C wind chill
26
kph wind from W

Lewistown weather for Monday 1st June 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 19°C, maximum UV of 8 (Very High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 57% chance of some rain and a gentle breeze of 16 kph from the west.