Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 32°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Wednesday
13th May
32

9

6

6
Thursday
14th May
18

7

14

7
Friday
15th May
19

7

8

6
Saturday
16th May
15

5

5

5
Sunday
17th May
9

2

0

5

5-day weather forecast updated at 04:02 on Wednesday 13th May 2026 GMT

More about Lewistown

Lewistown by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Montana

Crystal Ski: Top ski deals to USA

Sale

Save on skiing holidays to the USA in winter 2025/2026
Book early with Crystal Ski for the best deals
Filter by promotional offers, duration, board basis & more

Go to Crystal Ski deal >>

View all Crystal Ski offers

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 Wednesday 13th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 62% chance of some rain and a fresh breeze of 37 kph from the west.

32
°C maximum temperature
9
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
6
UV index (High)
62
% chance of some rain
<5
mm of rainfall expected
M
moderate heat & humidity
37
kph wind from W

Lewistown weather for Thursday 14th May 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 18°C, maximum UV of 7 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate gale of 53 kph from the west.

18
°C maximum temperature
7
°C minimum temperature
clear skies
14
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
18
°C wind chill
53
kph wind from W

Lewistown weather for Friday 15th May 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 19°C, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a strong breeze of 41 kph from the west.

19
°C maximum temperature
7
°C minimum temperature
broken clouds
8
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
19
°C wind chill
41
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 15°C, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 40% chance of some rain and a moderate breeze of 26 kph from the north-west.

15
°C maximum temperature
5
°C minimum temperature
mostly cloudy with light rain
5
hours of sunshine
5
UV index (Moderate)
40
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
26
kph wind from NW

Lewistown weather for Sunday 17th May 2026

Expect cloudy with sleet or snow in Lewistown, Montana with a maximum temperature of 9°C, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 5-10 mm of sleet/snow expected with 70% chance of some sleet or snow and a moderate breeze of 21 kph from the north-west.