- Rain mm/yr
- 4,500
- Snowfall
- Not applicable—tropical location; never occurs
Updated July 2026 · Sources cited: pulauaslitour.com, surfcampsumatra.com
Good to know
Good to Know
- The islands are in the equatorial zone, so the monsoon cycle governs weather, not seasonal temperature shifts—it stays hot and humid year-round.
- Rain comes in short, heavy bursts throughout the day, even in the dry season. The jungle canopy provides natural shelter during these tropical downpours.
- UV index is extreme (9-11+) during dry-season clear skies; SPF 50+ sunscreen is essential.
- December and January surprise visitors with occasional clean swells between rain; this time offers solitude and empty lineups if you can be flexible with conditions.
- Ferry crossings from Padang take 3-4 hours in calm seas but can stretch to 6 hours during rough wet-season conditions—build a buffer day for travel in November-March.
Seasons
Dry Season
- Months
- April-October
- Wind Pattern
- Southeast trade winds blow offshore, creating clean wave conditions
- Classification
- Best/Peak
- Characteristics
- Sunshine-dominant days; consistent Southern Indian Ocean swells; premium conditions for outdoor activities
- Rainfall Pattern
- Significantly lower rainfall; skies clearer
- Temperature Celsius Range
- 28-32°C (82–90°F)
- Temperature Fahrenheit Range
- 28-32°C (82–90°F)
Wet Season
- Months
- November-March
- Wind Pattern
- Northwest monsoon winds blow onshore; variable and sometimes stormy
- Classification
- Worst/Off-peak
- Characteristics
- Frequent afternoon and evening rain showers with thunderstorms; rougher seas and variable conditions; forest becomes lush and vibrant
- Rainfall Pattern
- Increased significantly; December-January are the wettest months
- Temperature Celsius Range
- 28-32°C (82–90°F)
- Temperature Fahrenheit Range
- 28-32°C (82–90°F)
Overview
Tropical rainforest climate with consistent year-round heat and two monsoon seasons. The islands sit near the equator (1-3 degrees south) and experience monsoon-driven weather patterns rather than traditional four-season cycles.
Rainfall
- Peak Months
- December and January are the wettest
- Annual Total Mm
- 4500
- Dry Season Pattern
- Even in the dry season (April-October), regular rain occurs but in shorter intervals and lower overall volumes
- Note
- One of Indonesia's highest annual precipitation totals. October-March is the concentrated wet season.
Snowfall
Not applicable—tropical location; never occurs
Temperature
- Note
- Temperature remains stable throughout the year; nighttime temperatures rarely drop below 24°C (75°F). Humidity stays 80-90% year-round.
Year Round Range
- Celsius Max
- 32
- Celsius Min
- 28
- Fahrenheit Max
- 90
- Fahrenheit Min
- 82
Worst Months
December-January (heaviest rainfall, roughest seas, onshore winds; ferry crossings slower and less reliable)
Water Temperature
- Year Round Celsius
- 27
- Year Round Fahrenheit
- 80
- Note
- Consistently warm throughout the year; no wetsuit required for most water activities
Best Months For Visiting
- Peak
- June-August (absolute peak with most consistent conditions, highest rainfall in some activity types like water sports, highest crowds)
- Shoulder
- March-May and September-October (excellent balance of favorable weather, fewer crowds, quality conditions)
- Off Season
- November-February (wet season; unpredictable conditions but very few visitors, lower prices)
AI-generated estimateData refreshed July 2026
Sources cited for this category
These are the sources cited in this climate & weather research for this city. Individual figures may not each trace to one of them.
More About Mentawai Islands
Data last updated July 2026 · Verify anything important.