Monthly climate averages for Williston, United States. Based on 10-year ERA5 reanalysis data.
BSk Cold Semi-Arid
Climate OverviewWilliston, United States in May has warm conditions, with highs averaging 20.4°C (69°F). Temperatures drop noticeably between day and night.
This month falls at the end of Spring.
Daily highs in May gradually rise from around 19°C (66°F) at the start to 22°C (72°F) by month's end.
Rainfall is heaviest during the middle of the month, while the first third tends to be drier.
The warmest days tend to fall around the 31th, averaging 23.1°C (74°F).
Compared to April, this month is about 8°C warmer with 3 more rainy days. Temperatures will rise further into June.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 20°C (69°F) are ideal for full-day outdoor exploration.
Rain usually comes in shorter passing showers rather than all-day rain.
1 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -3°C / -12°C | -9°C / -18°C | 3days (10 mm) Excellent | 5.8h Fair | 76% Humid | 2.1 Moderate | Poor | View Details |
| February | -2°C / -13°C | -8°C / -18°C | 4days (12 mm) Good | 7.4h Good | 68% Muggy | 3.2 Moderate | Poor | View Details |
| March | 5°C / -6°C | 1°C / -11°C | 5days (20 mm) Good | 8.7h Good | 67% Muggy | 4.2 Moderate | Poor | View Details |
| April | 12°C / 0°C | 8°C / -5°C | 6days (41 mm) Good | 10h Excellent | 60% Moderate | 5.3 High | Poor | View Details |
| May | 20°C / 8°C | 18°C / 4°C | 9days (70 mm) Wet | 11.4h Excellent | 57% Moderate | 6.2 High | Good | View Details |
| June best | 26°C / 14°C | 25°C / 12°C | 8days (58 mm) Wet | 12.7h Excellent | 57% Moderate | 7 High | Excellent | View Details |
| July best | 29°C / 17°C | 29°C / 16°C | 8days (56 mm) Wet | 13.3h Excellent | 58% Moderate | 7 High | Excellent | View Details |
| August best | 29°C / 16°C | 28°C / 15°C | 6days (41 mm) Good | 11.8h Excellent | 57% Moderate | 6.4 High | Excellent | View Details |
| September best | 24°C / 12°C | 21°C / 9°C | 6days (49 mm) Good | 9.5h Good | 57% Moderate | 5.2 High | Excellent | View Details |
| October | 14°C / 4°C | 10°C / 0°C | 5days (34 mm) Good | 7.4h Good | 62% Muggy | 3.4 Moderate | Fair | View Details |
| November | 5°C / -3°C | 0°C / -8°C | 5days (19 mm) Good | 5.8h Fair | 70% Muggy | 2.1 Moderate | Poor | View Details |
| December | -2°C / -11°C | -7°C / -16°C | 6days (21 mm) Good | 5.2h Fair | 75% Muggy | 1.7 Low | Poor | View Details |
Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.
Temperatures drop significantly at night, so pack layers you can add or remove throughout the day.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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