Williston, United States experiences average highs of 13°C (55°F) and lows of 2°C (36°F) throughout the year. The climate is relatively dry, with only 6 rainy days per month on average. Sunshine is abundant, averaging about 9 hours per day. Average highs have cooled by 0.8°C (1.4°F) across the available records.
Williston, United States Weather & Climate 2026
Monthly climate averages for Williston, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: May–Jul At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.2/10
Best: June, July, August, September
UV Index
4
Low
Temperature 13°C / 2°C
Feels Like 10°C / -2°C
Rainy Days 6
Rainfall 36 mm
Sunshine 9 h
Humidity 64%
Wind Speed 23 km/h
Dew Point 1°C
Snow Days 6 days
Frost Days 20 days
Hottest Month
29°C
July
Avg Low17°C
Rain8days
Coldest Month
-13°C
February
Avg High-2°C
Rain4days
Driest Month
3days
January
Avg High-3°C
Avg Low-12°C
Windiest Month
26 km/h
April (Gusts 45)
Worst Time to Visit
Consider avoiding January, February, November, December due to very cold temperatures.
Sun Position
Sunrise 05:55
Daylight 16h
Sunset 21:58
Live conditions—
Williston on the map · live conditions
Williston, United States
- Continent
- Americas
- Country
- United States
- City
- Williston
- Population
- 27K
- Elevation
- 572 m
- Coordinates
- 48.15°, -103.62°
Seasonal Breakdown
Spring
Mar–May
Avg High 13°C
Avg Low 0°C
Rain 7 days/mo
Summer
Jun–Aug
Avg High 28°C
Avg Low 16°C
Rain 7 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 14°C
Avg Low 4°C
Rain 5 days/mo
1/3 best months
Winter
Dec–Feb
Avg High -3°C
Avg Low -12°C
Rain 4 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: -3°C / -12°C . Feb: -2°C / -13°C . Mar: 5°C / -6°C . Apr: 12°C / 0°C . May: 20°C / 8°C . Jun: 26°C / 14°C . Jul: 29°C / 17°C . Aug: 29°C / 16°C . Sep: 24°C / 12°C . Oct: 14°C / 4°C . Nov: 5°C / -3°C . Dec: -2°C / -11°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 10 mm. Feb: 12 mm. Mar: 20 mm. Apr: 41 mm. May: 70 mm. Jun: 58 mm. Jul: 56 mm. Aug: 41 mm. Sep: 49 mm. Oct: 34 mm. Nov: 19 mm. Dec: 21 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 76%. Feb: 68%. Mar: 67%. Apr: 60%. May: 57%. Jun: 57%. Jul: 58%. Aug: 57%. Sep: 57%. Oct: 62%. Nov: 70%. Dec: 75%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 22 km/h . Feb: 23 km/h . Mar: 24 km/h . Apr: 26 km/h . May: 24 km/h . Jun: 24 km/h . Jul: 21 km/h . Aug: 22 km/h . Sep: 23 km/h . Oct: 24 km/h . Nov: 22 km/h . Dec: 22 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 9h. Apr: 10h. May: 11h. Jun: 13h. Jul: 13h. Aug: 12h. Sep: 10h. Oct: 7h. Nov: 6h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 3. Nov: UV 2. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 8 days. Feb: 9 days. Mar: 8 days. Apr: 5 days. May: 1 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 3 days. Nov: 7 days. Dec: 10 days.
Climate Trends
Average highs have cooled by 0.8°C (1.4°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 29°C | Jul · 29°C |
| Coldest month | Feb 2025 · -19°C | Feb · -13°C |
| Wettest month | May 2025 · 109 mm | May · 70 mm |
| Windiest month | Oct 2025 · 26 km/h | Apr · 26 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Fair November
Poor December
Poor | 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 |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Williston are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Williston, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Williston is July, with average daytime highs of 29°C (85°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Williston is February, with average overnight lows of -13°C (9°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Williston is May, averaging 70mm of precipitation across 9 rainy days. An umbrella or waterproof jacket is essential.
Williston receives approximately 109 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Williston.
The least favorable months to visit Williston are January, February, November, December, primarily due to very cold temperatures. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Williston is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Williston is 64%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Williston receives snow. Months with snowfall average 6 snow days and 9 cm (4 in) of accumulation, with about 20 frost days during winter.
Average wind speeds in Williston are 23 km/h (14 mph). The windiest month is April with peak winds reaching 26 km/h (16 mph) (gusts up to 45 km/h / 28 mph).
Williston averages 5 clear-sky days per month with overall cloud cover around 54%. The clearest skies occur in July.
The annual average dew point in Williston is 1°C (34°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Williston has a Cold Semi-Arid climate, classified as BSk under the Köppen system. Arid climates have very low rainfall relative to temperature, with large swings between daytime heat and cool nights.
The 'feels like' temperature in Williston ranges from -2°C (28°F) to 10°C (50°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Williston. It earns a climate score of 8.9/10 with Excellent.
For June in Williston, pack Umbrella, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. With average highs of 26°C (79°F) and 8 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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