Sinop, Brazil experiences average highs of 31°C (88°F) and lows of 22°C (72°F) throughout the year. Rainfall is frequent, averaging about 14 rainy days per month. Sunshine is abundant, averaging about 10 hours per day. Average highs have stayed broadly stable across the available records.
Sinop, Brazil Weather & Climate 2026
Monthly climate averages for Sinop, Brazil. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: May–Oct 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.4/10
Best: June, July
UV Index
8
High
Temperature 31°C / 22°C
Feels Like 35°C / 24°C
Rainy Days 14
Rainfall 128 mm
Sunshine 10 h
Humidity 72%
Wind Speed 10 km/h
Dew Point 21°C
Hottest Month
35°C
September
Avg Low 23°C
Rain 6 days
Coldest Month
19°C
July
Avg High 32°C
Rain 0 days
Driest Month
0 days
July
Avg High 32°C
Avg Low 19°C
Windiest Month
12 km/h
July (Gusts 32)
Worst Time to Visit
Consider avoiding February, March, October, November due to extreme heat, heavy rainfall, oppressive humidity.
Sun Position
Sunrise 06:03
Daylight 11.5h
Sunset 17:33
Live conditions —
Sinop on the map · live conditions
Sinop, Brazil
- Continent
- Americas
- Country
- Brazil
- City
- Sinop
- Population
- 216K
- Coordinates
- -11.86°, -55.50°
Seasonal Breakdown
Spring
Sep–Nov
Avg High 33°C
Avg Low 23°C
Rain 14 days/mo
Summer
Dec–Feb
Avg High 29°C
Avg Low 22°C
Rain 26 days/mo
Autumn
Mar–May
Avg High 30°C
Avg Low 22°C
Rain 16 days/mo
Winter
Jun–Aug
Avg High 33°C
Avg Low 20°C
Rain 1 days/mo
2/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 29°C / 22°C . Feb: 29°C / 22°C . Mar: 29°C / 22°C . Apr: 30°C / 22°C . May: 31°C / 21°C . Jun: 32°C / 20°C . Jul: 32°C / 19°C . Aug: 34°C / 21°C . Sep: 35°C / 23°C . Oct: 33°C / 23°C . Nov: 30°C / 22°C . Dec: 29°C / 22°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 271 mm. Feb: 263 mm. Mar: 239 mm. Apr: 108 mm. May: 13 mm. Jun: 2 mm. Jul: 0 mm. Aug: 4 mm. Sep: 32 mm. Oct: 109 mm. Nov: 215 mm. Dec: 284 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 88%. Feb: 88%. Mar: 88%. Apr: 85%. May: 70%. Jun: 58%. Jul: 48%. Aug: 45%. Sep: 52%. Oct: 73%. Nov: 84%. Dec: 88%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 9 km/h . Feb: 8 km/h . Mar: 8 km/h . Apr: 8 km/h . May: 10 km/h . Jun: 11 km/h . Jul: 12 km/h . Aug: 12 km/h . Sep: 11 km/h . Oct: 9 km/h . Nov: 8 km/h . Dec: 8 km/h .
Sunshine
Sunshine
Sunshine: Jan: 9h. Feb: 9h. Mar: 9h. Apr: 10h. May: 11h. Jun: 10h. Jul: 11h. Aug: 11h. Sep: 11h. Oct: 10h. Nov: 9h. Dec: 9h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 8. Feb: UV 7. Mar: UV 8. Apr: UV 8. May: UV 7. Jun: UV 7. Jul: UV 7. Aug: UV 8. Sep: UV 9. Oct: UV 9. Nov: UV 8. Dec: UV 8.
Monthly Daylight Hours
Daylight 12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 34 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Sep 2025 · 35°C | Sep · 35°C |
| Coldest month | Jul 2025 · 19°C | Jul · 19°C |
| Wettest month | Dec 2025 · 388 mm | Dec · 284 mm |
| Windiest month | Jun 2025 · 12 km/h | Jul · 12 km/h |
Month-by-Month Weather Table
January
Wet 
February
Wet March
Wet April
Wet May
Good June best
Excellent July best
Excellent August
Good September
Fair October
Poor November
Wet December
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 29°C / 22°C | 35°C / 26°C | 27days (271 mm) Wet | 9h Good | 88% Very Muggy | 8 Very High | Wet | View Details |
| February | 29°C / 22°C | 35°C / 26°C | 25days (263 mm) Wet | 8.9h Good | 88% Very Muggy | 7.4 Very High | Wet | View Details |
| March | 29°C / 22°C | 36°C / 26°C | 26days (239 mm) Wet | 9h Good | 88% Very Muggy | 8.1 Very High | Wet | View Details |
| April | 30°C / 22°C | 35°C / 26°C | 18days (108 mm) Wet | 10h Excellent | 85% Humid | 7.7 Very High | Wet | View Details |
| May | 31°C / 21°C | 34°C / 23°C | 3days (13 mm) Excellent | 10.5h Excellent | 70% Muggy | 7.1 Very High | Good | View Details |
| June best | 32°C / 20°C | 33°C / 21°C | 1days (2 mm) Excellent | 10.4h Excellent | 58% Moderate | 6.6 High | Excellent | View Details |
| July best | 32°C / 19°C | 33°C / 19°C | 0days (0 mm) Excellent | 10.5h Excellent | 48% Moderate | 6.9 High | Excellent | View Details |
| August | 34°C / 21°C | 35°C / 21°C | 2days (4 mm) Excellent | 10.6h Excellent | 45% Moderate | 7.7 Very High | Good | View Details |
| September | 35°C / 23°C | 38°C / 24°C | 6days (32 mm) Good | 10.8h Excellent | 52% Moderate | 8.6 Very High | Fair | View Details |
| October | 33°C / 23°C | 38°C / 27°C | 15days (109 mm) Wet | 10.3h Excellent | 73% Muggy | 8.5 Very High | Poor | View Details |
| November | 30°C / 22°C | 36°C / 26°C | 22days (215 mm) Wet | 9.3h Good | 84% Humid | 8.2 Very High | Wet | View Details |
| December | 29°C / 22°C | 35°C / 26°C | 27days (284 mm) Wet | 8.6h Good | 88% Very Muggy | 7.6 Very High | Wet | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Sinop are June, July, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Sinop, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Sinop is September, with average daytime highs of 35°C (96°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Sinop is July, with average overnight lows of 19°C (66°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Sinop is December, averaging 284mm of precipitation across 27 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Sinop runs through January, December, March, February, with the heaviest rainfall in January. Based on 10-year averages for Sinop.
Sinop receives approximately 118 sunshine hours per year. The sunniest month is September with around 11 hours. Based on climate data for Sinop.
The least favorable months to visit Sinop are February, March, October, November, primarily due to extreme heat, heavy rainfall, oppressive humidity. For the best conditions, consider June, July instead.
The annual average UV index in Sinop is 8, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Sinop is 72%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Average wind speeds in Sinop are 10 km/h (6 mph). The windiest month is July with peak winds reaching 12 km/h (7 mph) (gusts up to 32 km/h / 20 mph).
Sinop averages 5 clear-sky days per month with overall cloud cover around 61%. The clearest skies occur in July.
The annual average dew point in Sinop is 21°C (70°F), which feels muggy and uncomfortable. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Sinop has a Tropical Monsoon climate, classified as Am under the Köppen system. Tropical climates are warm year-round with high rainfall and temperatures rarely dropping below 18°C (64°F).
The 'feels like' temperature in Sinop ranges from 24°C (75°F) to 35°C (95°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
Yes, July is a great time to visit Sinop. It earns a climate score of 9.6/10 with Excellent.
For July in Sinop, pack Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses, Sandals. With average highs of 32°C (90°F) and 0 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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