Northern Mariana Islands Saipan Weather in September — Climate Guide
September in Saipan is low
Saipan Weather in September — Quick Answer
As of 2026- Avg temp
- 31° / 25°
- Rainfall
- 220mm · 18 days
- Crowds
- Quiet
As of 2026, Saipan in September averages a high of 31°C and low of 25°C with 220mm of rain over about 18 days. Hot, wet, very humid. Light quick-dry clothing, swimwear, reef-safe SPF 50, a strong rain jacket, and water shoes.
September is low for Saipan.
September stays in the heart of the wet and typhoon season — hot 25-31°C days, heavy humidity, frequent rain, and continued storm risk. Conditions resemble August.
It's a low-crowd, low-price month, so it can be cheap if you accept the weather and the chance of flight disruption.
Travel score
Saipan September Weather Stats
Avg High
31°C
Avg Low
25°C
Rainy Days
18
220mm total
Sunshine
6h
Daily avg
Humidity
81%
very humid
UV Index
11
Extreme
Wind
15 km/h
Gusts 33
Sea Temp
29°C
warm — ideal
Crowds
Quiet
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
8 μg/m³
PM10
16 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
36°C
Nighttime
27°C
Humidity and wind affect how the actual temperature feels.
Wind
15 km/h
Max gust 33 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Lowest prices
- Very few crowds
- Warm sea (~29°C)
Cons
- Heavy rain and humidity
- High typhoon and flight-disruption risk
- Rough seas can limit diving
September Events & Festivals
- Wet season continues
- High typhoon risk
- Warm sea ~29°C
Saipan in September — Full Picture
September stays in the heart of the wet and typhoon season — hot 25-31°C days, heavy humidity, frequent rain, and continued storm risk. Conditions resemble August.
It's a low-crowd, low-price month, so it can be cheap if you accept the weather and the chance of flight disruption.
Manage expectations: plan around forecasts, use clearer mornings for water, and keep indoor history as a backup. Seas can be rough for diving.
UV remains high; humidity is heavy throughout.
What to Wear & What to Pack
Hot, wet, very humid. Light quick-dry clothing, swimwear, reef-safe SPF 50, a strong rain jacket, and water shoes.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
30.3°C
24.7°C
9/mo
Summer (Jun·Jul·Aug)
31°C
25°C
15.7/mo
Autumn (Sep·Oct·Nov)
Current30.7°C
25°C
16.3/mo
Winter (Dec·Jan·Feb)
29°C
24°C
10.7/mo
Saipan Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 29° | 24° | 11d·110mm | 7h | 78% | 10 | Busy | Peak |
| February (Best) | 29° | 24° | 9d·80mm | 8h | 77% | 10 | Busy | Peak |
| March (Best) | 30° | 24° | 8d·70mm | 8h | 77% | 11 | Busy | Peak |
| 30° | 25° | 8d·80mm | 8h | 77% | 11 | Moderate | Shoulder | |
| 31° | 25° | 11d·120mm | 7h | 78% | 11 | Moderate | Shoulder | |
| 31° | 25° | 13d·130mm | 7h | 79% | 11 | Quiet | Shoulder | |
| 31° | 25° | 16d·180mm | 6h | 80% | 11 | Moderate | Shoulder | |
| 31° | 25° | 18d·230mm | 6h | 81% | 11 | Moderate | Shoulder | |
| 31° | 25° | 18d·220mm | 6h | 81% | 11 | Quiet | Low season | |
| 31° | 25° | 17d·200mm | 6h | 80% | 11 | Quiet | Low season | |
| 30° | 25° | 14d·150mm | 7h | 79% | 10 | Moderate | Shoulder | |
| 29° | 24° | 12d·120mm | 7h | 78% | 10 | Busy | Peak |
View Other Months
Saipan September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Saipan?
Saipan in September is low. Tourist crowds are quiet and flight/hotel prices are low season.
What's the average temperature in Saipan in September?
Saipan September averages a high of 31°C and a low of 25°C.
Does it rain much in Saipan in September?
Saipan September averages 220mm of rainfall over about 18 rainy days.
What should I wear in Saipan in September?
Hot, wet, very humid. Light quick-dry clothing, swimwear, reef-safe SPF 50, a strong rain jacket, and water shoes.
What time are sunrise and sunset in Saipan in September?
Saipan September sunrise is 06:10 and sunset is 18:15, with 12h 05min of daylight.
What's the air quality like in Saipan in September?
Saipan September air quality (AQI) averages 25, rated Good. PM2.5 averages 8μg/m³.
What activities are recommended in Saipan in September?
In September, Saipan is great for Snorkeling in clear spells, American Memorial Park museum, WWII memorial loop.
Is September peak season in Saipan?
Saipan September crowds are quiet and prices are low season. You can travel relatively comfortably without long queues.
Best Months to Visit Saipan
View Other Months
Planning a September trip to Saipan?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.