Lewiston (ID)
May
Weather in Lewiston, Idaho for May 2026
Your guide to Lewiston weather in May - trends and predictions
So far, May 2026 in Lewiston is slightly warmer than the historical average by 0.9 °F.
The forecast for the next days in Lewiston predicts temperatures to be around 21 °F, close to the historical average.
In general, the average temperature in Lewiston at the beginning of May is 22.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 26 °F by the end of May.
Lewiston experiences moderate rainfall in May, with an average of 8 rainy days and a total precipitation of 12.8 mm.
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Temperatures
Rain 🌧️
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23
Dry days
8
Rainy days
0
Snow days
20°/7°
Temperatures
13 km/h
Avg max wind
65 %
Avg humidity
Lewiston Weather May
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Temperatures trend during May in Lewiston
See the weather trend as well as the moving average line
May weather in Lewiston day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Sunny | 23° /5° | 0 mm | 7 | |
| May 2 | Sunny | 25° /7° | 0 mm | 7 | |
| May 3 |  Cloudy | 21° /9° | 0.1 mm | 6 | |
| May 4 |  Overcast | 20° /7° | 0 mm | 6 | |
| May 5 | Sunny | 21° /6° | 0 mm | 6 | |
| May 6 | Sunny | 23° /7° | 0 mm | 7 | |
| May 7 |  Partly cloudy | 24° /8° | 0 mm | 7 | |
| May 8 | Partly cloudy | 20° /9° | 0.3 mm | 7 | |
| May 9 | Overcast | 25° /6° | 0 mm | 6 | |
| May 10 | Sunny | 33° /12° | 0 mm | 7.2 | |
| May 11 | Sunny | 22° /7° | 0 mm | 7 | |
| May 12 | Sunny | 26° /8° | 0 mm | 0 | |
| May 13 |  Patchy rain possible | 27° /12° | 0.7 mm | 4 | |
| May 14 | Patchy rain possible | 22° /14° | 3.1 mm | 4 | |
| May 15 | Patchy rain possible | 19° /8° | 0.8 mm | 3 | |
| May 16 | Sunny | 15° /4° | 0 mm | 3 | |
| May 17 | Sunny | 18° /2° | 0 mm | 4 | |
| May 18 | Sunny | 20° /6° | 0 mm | 4 | |
| May 19 | Sunny | 22° /9° | 0 mm | 5 | |
| May 20 | Sunny | 19° /4° | 0 mm | 4 | |
| May 21 | Sunny | 18° /4° | 0 mm | 4 | |
| May 22 | Sunny | 19° /4° | 0 mm | 4 | |
| May 23 | Sunny | 19° /5° | 0 mm | 4 | |
| May 24 | Sunny | 24° /8° | 0 mm | 6 | |
| May 25 | Sunny | 30° /10° | 0 mm | 8 | |
| May 26 | Overcast | 16° /8° | 0 mm | 4 | |
| May 27 |  Fog | 22° /8° | 0 mm | 5 | |
| May 28 | Sunny | 30° /10° | 0 mm | 8 | |
| May 29 | Cloudy | 26° /12° | 0 mm | 6 | |
| May 30 | Fog | 26° /6° | 0 mm | 6 | |
| May 31 | Partly cloudy | 32° /9° | 0 mm | 8 | |
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Important Notice
Our weather forecast for Lewiston in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Lewiston forecast closer to your planned date for the most up-to-date weather information.
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Lewiston in May - FAQ
What are the expected maximum and minimum temperatures in Lewiston during May?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Lewiston during May?
Expect minimal rainfall in Lewiston during May, with a total of 12.8 mm over approximately 8 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Lewiston during May?
The average wind speed in Lewiston during May is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Lewiston
Explore the daily rainfall trends and prepare for Lewistons May weather 💧
Typically, Lewiston has 8 rainy days in May with a total of 12.8 mm of rainfall.
UV exposure in Lewiston during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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