September · Marshall Islands
Best time to visit Bikini Atoll in September Weather, crowds & prices
Weather in Bikini Atoll in September
Average temperature 28°C, 176 mm of rain, about 28 days with 6+ hours of sunshine and 79% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
4.2/10
Ranked #11 of 12 months
- Avg temp
- 28°C
- Rainfall
- 176 mm
- Humidity
- 79%
- Days with 6h+ sun
- 28
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Bikini Atoll scores 4.2/10 for sightseeing and cultural travel - ranked #11 of 12. Expect around 28°C, 176 mm of rain, and roughly 28 days with 6+ hours of sunshine this month.
Bikini Atoll is a UNESCO-listed Marshall Islands site shaped by nuclear-test history, displaced communities, coral lagoons, and highly specialized organized diving access.
September in Bikini Atoll — the hardest end of the year
Days in September average 28°C (82°F) and humidity near 79% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
176 mm of rain makes this a wet month here, though with about 28 days with 6+ hours of sunshine there is still bright weather between the fronts.
That is 4.2/10 on the same scale — 11th of 12 months, versus 7.5/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Expect low-season pricing, and crowds are light for this destination.
If your dates are flexible, February is materially better in Bikini Atoll — 3.3 points higher on the same scale.
Frequently asked
- What is the weather like in Bikini Atoll in September?
- In September, Bikini Atoll averages 28°C, 176 mm of rain, and about 28 days with 6+ hours of sunshine. Its climate-comfort score is 4.2/10.
- Is September a good time to visit Bikini Atoll?
- September earns a 4.2/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Bikini Atoll in September?
- Expect about 176 mm of rain in September. Average humidity is 79% and there are about 28 days with 6+ hours of sunshine.
Curated in Bikini Atoll
Tickets & experiences
Things to do in Bikini Atoll
Bikini Atoll, Marshall Islands. Live activities and tours from GetYourGuide, matched to this destination.