Duncan, United States experiences average highs of 24°C (75°F) and lows of 14°C (57°F) throughout the year. The climate is relatively dry, with only 7 rainy days per month on average. Sunshine is abundant, averaging about 10 hours per day. Average highs have stayed broadly stable across the available records.
Duncan, United States Weather & Climate 2026
Monthly climate averages for Duncan, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Oct At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.6/10
Best: April, May, September, October, November
UV Index
6
High
Temperature 24°C / 14°C
Feels Like 23°C / 12°C
Rainy Days 7
Rainfall 67 mm
Sunshine 10 h
Humidity 60%
Wind Speed 20 km/h
Dew Point 11°C
Snow Days 2 days
Frost Days 6 days
Hottest Month
36°C
July
Avg Low25°C
Rain5days
Coldest Month
1°C
January
Avg High12°C
Rain5days
Driest Month
4days
December
Avg High14°C
Avg Low4°C
Windiest Month
24 km/h
April (Gusts 49)
Worst Time to Visit
Consider avoiding January due to less favorable weather conditions.
Sun Position
Sunrise 06:20
Daylight 14.5h
Sunset 20:47
Live conditions—
Duncan on the map · live conditions
Duncan, United States
- Continent
- Americas
- Country
- United States
- City
- Duncan
- Population
- 23.2K
- Elevation
- 342 m
- Coordinates
- 34.50°, -97.96°
Seasonal Breakdown
Spring
Mar–May
Avg High 24°C
Avg Low 13°C
Rain 9 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 34°C
Avg Low 24°C
Rain 6 days/mo
Autumn
Sep–Nov
Avg High 25°C
Avg Low 15°C
Rain 6 days/mo
3/3 best months
Winter
Dec–Feb
Avg High 13°C
Avg Low 3°C
Rain 5 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: 12°C / 1°C . Feb: 15°C / 3°C . Mar: 21°C / 9°C . Apr: 24°C / 12°C . May: 28°C / 18°C . Jun: 33°C / 23°C . Jul: 36°C / 25°C . Aug: 35°C / 25°C . Sep: 31°C / 21°C . Oct: 25°C / 15°C . Nov: 18°C / 8°C . Dec: 14°C / 4°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 40 mm. Feb: 48 mm. Mar: 86 mm. Apr: 131 mm. May: 128 mm. Jun: 56 mm. Jul: 36 mm. Aug: 47 mm. Sep: 66 mm. Oct: 87 mm. Nov: 45 mm. Dec: 36 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 61%. Feb: 61%. Mar: 58%. Apr: 60%. May: 67%. Jun: 63%. Jul: 55%. Aug: 54%. Sep: 58%. Oct: 57%. Nov: 64%. Dec: 62%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 20 km/h . Feb: 21 km/h . Mar: 23 km/h . Apr: 24 km/h . May: 21 km/h . Jun: 19 km/h . Jul: 17 km/h . Aug: 17 km/h . Sep: 17 km/h . Oct: 20 km/h . Nov: 20 km/h . Dec: 20 km/h .
Sunshine
Sunshine
Sunshine: Jan: 8h. Feb: 8h. Mar: 9h. Apr: 10h. May: 10h. Jun: 12h. Jul: 13h. Aug: 12h. Sep: 10h. Oct: 9h. Nov: 8h. Dec: 7h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 4. Feb: UV 5. Mar: UV 6. Apr: UV 7. May: UV 8. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 7. Oct: UV 5. Nov: UV 4. Dec: UV 3.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 2 days. Feb: 2 days. Mar: 0 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 1 days.
Climate Trends
Average highs have stayed broadly stable 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 · 34°C | Jul · 36°C |
| Coldest month | Jan 2025 · -1°C | Jan · 1°C |
| Wettest month | Apr 2025 · 326 mm | Apr · 131 mm |
| Windiest month | Mar 2025 · 27 km/h | Apr · 24 km/h |
Month-by-Month Weather Table
January
Poor 
February
Fair March
Good April best
Excellent May best
Excellent June
Fair July
Fair August
Fair September best
Excellent October best
Excellent November best
Excellent December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 12°C / 1°C | 8°C / -3°C | 5days (40 mm) Good | 7.5h Good | 61% Muggy | 3.5 Moderate | Poor | View Details |
| February | 15°C / 3°C | 11°C / -2°C | 6days (48 mm) Good | 7.8h Good | 61% Muggy | 4.5 Moderate | Fair | View Details |
| March | 21°C / 9°C | 18°C / 5°C | 8days (86 mm) Wet | 9.1h Good | 58% Moderate | 5.9 High | Good | View Details |
| April best | 24°C / 12°C | 22°C / 10°C | 8days (131 mm) Wet | 9.7h Good | 60% Moderate | 6.5 High | Excellent | View Details |
| May best | 28°C / 18°C | 29°C / 17°C | 11days (128 mm) Wet | 10.4h Excellent | 67% Muggy | 7.5 Very High | Excellent | View Details |
| June | 33°C / 23°C | 35°C / 24°C | 7days (56 mm) Good | 12.1h Excellent | 63% Muggy | 8 Very High | Fair | View Details |
| July | 36°C / 25°C | 38°C / 27°C | 5days (36 mm) Good | 12.6h Excellent | 55% Moderate | 8 Very High | Fair | View Details |
| August | 35°C / 25°C | 37°C / 27°C | 6days (47 mm) Good | 11.8h Excellent | 54% Moderate | 7.7 Very High | Fair | View Details |
| September best | 31°C / 21°C | 33°C / 22°C | 6days (66 mm) Good | 10.1h Excellent | 58% Moderate | 6.6 High | Excellent | View Details |
| October best | 25°C / 15°C | 24°C / 13°C | 7days (87 mm) Good | 9.1h Good | 57% Moderate | 5.3 High | Excellent | View Details |
| November best | 18°C / 8°C | 16°C / 5°C | 5days (45 mm) Good | 7.7h Good | 64% Muggy | 3.9 Moderate | Excellent | View Details |
| December | 14°C / 4°C | 11°C / 0°C | 4days (36 mm) Good | 7.3h Good | 62% Muggy | 3.3 Moderate | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Duncan are April, May, September, October, November, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Duncan, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Duncan is July, with average daytime highs of 36°C (96°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Duncan is January, with average overnight lows of 1°C (34°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Duncan is April, averaging 131mm of precipitation across 8 rainy days. An umbrella or waterproof jacket is essential.
Duncan receives approximately 115 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Duncan.
The least favorable months to visit Duncan are January, primarily due to less favorable weather conditions. For the best conditions, consider April, May, September, October, November instead.
The annual average UV index in Duncan is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Duncan is 60%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Duncan receives snow. Months with snowfall average 2 snow days and 3 cm (1 in) of accumulation, with about 6 frost days during winter.
Average wind speeds in Duncan are 20 km/h (12 mph). The windiest month is April with peak winds reaching 24 km/h (15 mph) (gusts up to 49 km/h / 30 mph).
Duncan averages 10 clear-sky days per month with overall cloud cover around 43%. The clearest skies occur in October.
The annual average dew point in Duncan is 11°C (52°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Duncan has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Duncan ranges from 12°C (54°F) to 23°C (73°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
June is not the best time to visit Duncan, with a climate score of 5.6/10. Consider visiting during April, May, September, October, November instead for better conditions.
For June in Duncan, pack Umbrella, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. With average highs of 33°C (91°F) and 7 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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