Cacheu, Guinea-Bissau experiences average highs of 33°C (91°F) and lows of 23°C (73°F) throughout the year. Rainfall is moderate, averaging about 9 rainy days per month. Sunshine is abundant, averaging about 10 hours per day. Average highs have stayed broadly stable across the available records.
Cacheu, Guinea-Bissau Weather & Climate 2026
Monthly climate averages for Cacheu, Guinea-Bissau. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Jun–Nov At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.4/10
Best: January, February, December
UV Index
8
High
Temperature 33°C / 23°C
Feels Like 36°C / 25°C
Rainy Days 9
Rainfall 112 mm
Sunshine 10 h
Humidity 63%
Wind Speed 15 km/h
Dew Point 20°C
Hottest Month
37°C
April
Avg Low23°C
Rain0days
Coldest Month
20°C
January
Avg High35°C
Rain0days
Driest Month
0days
January
Avg High35°C
Avg Low20°C
Windiest Month
17 km/h
May (Gusts 38)
Sea Temperature
25°C – 31°C
Warmest water: October (
30.6°C
)
Worst Time to Visit
Consider avoiding July, September, October due to extreme heat, heavy rainfall, oppressive humidity.
Sun Position
Sunrise 06:41
Daylight 12.8h
Sunset 19:32
Live conditions—
Cacheu on the map · live conditions
Cacheu, Guinea-Bissau
- Continent
- Africa
- Country
- Guinea-Bissau
- City
- Cacheu
- Population
- 10.5K
- Coordinates
- 12.27°, -16.17°
Seasonal Breakdown
Spring
Mar–May
Avg High 37°C
Avg Low 23°C
Rain 0 days/mo
Summer
Jun–Aug
Avg High 31°C
Avg Low 25°C
Rain 19 days/mo
Autumn
Sep–Nov
Avg High 32°C
Avg Low 24°C
Rain 16 days/mo
Winter
Dec–Feb
Avg High 35°C
Avg Low 20°C
Rain 0 days/mo
3/3 best months
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: 35°C / 20°C . Feb: 36°C / 21°C . Mar: 37°C / 22°C . Apr: 37°C / 23°C . May: 36°C / 23°C . Jun: 33°C / 25°C . Jul: 30°C / 25°C . Aug: 29°C / 24°C . Sep: 30°C / 24°C . Oct: 32°C / 25°C . Nov: 34°C / 23°C . Dec: 34°C / 21°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 0 mm. Feb: 0 mm. Mar: 0 mm. Apr: 0 mm. May: 2 mm. Jun: 52 mm. Jul: 352 mm. Aug: 459 mm. Sep: 338 mm. Oct: 132 mm. Nov: 13 mm. Dec: 1 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 38%. Feb: 37%. Mar: 45%. Apr: 51%. May: 59%. Jun: 71%. Jul: 84%. Aug: 87%. Sep: 86%. Oct: 83%. Nov: 68%. Dec: 45%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 16 km/h . Mar: 16 km/h . Apr: 17 km/h . May: 17 km/h . Jun: 17 km/h . Jul: 16 km/h . Aug: 17 km/h . Sep: 14 km/h . Oct: 11 km/h . Nov: 12 km/h . Dec: 14 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 11h. Mar: 11h. Apr: 12h. May: 12h. Jun: 11h. Jul: 8h. Aug: 8h. Sep: 8h. Oct: 10h. Nov: 10h. Dec: 10h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 25°C . Feb: 26°C . Mar: 26°C . Apr: 27°C . May: 29°C . Jun: 30°C . Jul: 29°C . Aug: 29°C . Sep: 30°C . Oct: 31°C . Nov: 30°C . Dec: 27°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 7. Feb: UV 8. Mar: UV 9. Apr: UV 9. May: UV 9. Jun: UV 8. Jul: UV 7. Aug: UV 7. Sep: UV 7. Oct: UV 8. Nov: UV 7. Dec: UV 7.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending wetter by about 10 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Apr 2025 · 37°C | Apr · 37°C |
| Coldest month | Jan 2025 · 20°C | Jan · 20°C |
| Wettest month | Aug 2025 · 457 mm | Aug · 459 mm |
| Windiest month | May 2025 · 18 km/h | May · 17 km/h |
Month-by-Month Weather Table
January best
Excellent 
February best
Excellent March
Good April
Fair May
Fair June
Poor July
Wet August
Wet September
Wet October
Wet November
Good December best
Excellent | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 35°C / 20°C | 33°C / 18°C | 0days (0 mm) Excellent | 10.3h Excellent | 38% Comfortable | 7.2 Very High | Excellent | View Details |
| February best | 36°C / 21°C | 35°C / 19°C | 0days (0 mm) Excellent | 10.7h Excellent | 37% Comfortable | 8.2 Very High | Excellent | View Details |
| March | 37°C / 22°C | 37°C / 22°C | 0days (0 mm) Excellent | 11.1h Excellent | 45% Moderate | 9 Very High | Good | View Details |
| April | 37°C / 23°C | 39°C / 24°C | 0days (0 mm) Excellent | 11.6h Excellent | 51% Moderate | 9.1 Very High | Fair | View Details |
| May | 36°C / 23°C | 38°C / 26°C | 0days (2 mm) Excellent | 11.7h Excellent | 59% Moderate | 8.7 Very High | Fair | View Details |
| June | 33°C / 25°C | 37°C / 29°C | 7days (52 mm) Good | 10.9h Excellent | 71% Muggy | 8.1 Very High | Poor | View Details |
| July | 30°C / 25°C | 35°C / 29°C | 25days (352 mm) Wet | 8.1h Good | 84% Humid | 7.2 Very High | Wet | View Details |
| August | 29°C / 24°C | 34°C / 29°C | 26days (459 mm) Wet | 7.5h Good | 87% Very Muggy | 7.3 Very High | Wet | View Details |
| September | 30°C / 24°C | 36°C / 29°C | 26days (338 mm) Wet | 8.1h Good | 86% Very Muggy | 7.3 Very High | Wet | View Details |
| October | 32°C / 25°C | 38°C / 30°C | 18days (132 mm) Wet | 9.8h Good | 83% Humid | 7.6 Very High | Wet | View Details |
| November | 34°C / 23°C | 37°C / 27°C | 3days (13 mm) Excellent | 10.2h Excellent | 68% Muggy | 7.2 Very High | Good | View Details |
| December best | 34°C / 21°C | 33°C / 20°C | 0days (1 mm) Excellent | 10h Excellent | 45% Moderate | 6.7 High | Excellent | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Cacheu are January, February, December, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Cacheu, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Cacheu is April, with average daytime highs of 37°C (99°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Cacheu is January, with average overnight lows of 20°C (68°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Cacheu is August, averaging 459mm of precipitation across 26 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Cacheu runs through August, September, July, October, with the heaviest rainfall in August. Based on 10-year averages for Cacheu.
Cacheu receives approximately 120 sunshine hours per year. The sunniest month is May with around 12 hours. Based on climate data for Cacheu.
The least favorable months to visit Cacheu are July, September, October, primarily due to extreme heat, heavy rainfall, oppressive humidity. For the best conditions, consider January, February, December instead.
The annual average UV index in Cacheu is 8, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Cacheu is 63%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in January, February, March, April, May, June, July, August, September, October, November, December average 28°C (82°F), which is warm and comfortable for swimming and water activities.
Average wind speeds in Cacheu are 15 km/h (9 mph). The windiest month is May with peak winds reaching 17 km/h (11 mph) (gusts up to 38 km/h / 23 mph).
Cacheu averages 7 clear-sky days per month with overall cloud cover around 53%. The clearest skies occur in March.
The annual average dew point in Cacheu is 20°C (68°F), which feels muggy and uncomfortable. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Cacheu 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 Cacheu ranges from 25°C (77°F) to 36°C (97°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
June is not the best time to visit Cacheu, with a climate score of 4.1/10. Consider visiting during January, February, December instead for better conditions.
For June in Cacheu, pack Umbrella, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. With average highs of 33°C (92°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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