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.

Saturday
23rd May
23

6

14

UV7
Sunday
24th May
26

10

13

UV7
Monday
25th May
29

11

14

UV7
Tuesday
26th May
30

13

7

UV7
Wednesday
27th May
22

13

8

UV5

5-day weather forecast updated at 04:02 on Sunday 24th 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 Saturday 23rd May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 23°C, maximum UV of 7 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the west.

23
°C maximum temperature
6
°C minimum temperature
scattered clouds
14
hours of sunshine
UV7
UV index (High)
0
mm of rainfall expected
23
°C wind chill
10
kph wind from W

Lewistown weather for Sunday 24th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 26°C, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the west.

26
°C maximum temperature
10
°C minimum temperature
scattered clouds
13
hours of sunshine
UV7
UV index (High)
0
mm of rainfall expected
26
°C wind chill
17
kph wind from W

Lewistown weather for Monday 25th May 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 7 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the south-east.

29
°C maximum temperature
11
°C minimum temperature
clear skies
14
hours of sunshine
UV7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
19
kph wind from SE

Lewistown weather for Tuesday 26th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 30°C, low levels of heat & humidity, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 56% chance of some rain and a gentle breeze of 18 kph from the south-east.

30
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
UV7
UV index (High)
56
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
18
kph wind from SE

Lewistown weather for Wednesday 27th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 22°C, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 5-10 mm of rainfall expected with 73% chance of some rain and a light breeze of 9 kph from the north-west.