★ January29° · ☂ 13 ★ February29° · ☂ 11 ★ March30° · ☂ 12 April 31° · ☂ 12 May 31° · ☂ 14 June 31° · ☂ 16 July 31° · ☂ 21 August 31° · ☂ 20 September 31° · ☂ 21 October 30° · ☂ 23 November 30° · ☂ 16 December 30° · ☂ 15 Saipan in September:hot, Saipan, Northern Mariana Islands · Records from 2006 to 2025. Not a forecast.
Mean high 31° Hottest day 32.1° (2017)
Mean low 25° Coldest night 23.9° (2008)
Rain days 21 days 11-28 by year
Rainfall 312mm Daylight 12.4 → 12.0 h
Saipan's 12 months i Best: January to March
1 2 3 4 5 6 7 8 9 10 11 12
Trip types Beach Poorfrequent rain and storm risk Sightseeing on foot Poorhot, frequent rain, muggy and storm risk
Humidity 83% 30 muggy days
Clear days 1 day 22 overcast days
Mean wind 19 km/h 2 windy days
Sea temperature 30° 29.8-30.4° by year (last 6)
Sunrise / sunset (15th) 06:05 / 18:19 Daylight 12.4 → 12.0 h
Saipan in September Deep in the wet season, with rainy spells that can last, and typhoons are a real worry. Check the weather news right before departure. The summer peak is over, so rooms are cheaper and the island quieter. East Asian autumn holidays such as Chuseok sometimes land here; they follow the lunar calendar and move each year.
Saipan in September ran hot: 31°C by day and 25°C at night. By midday the shade was the best seat in town. Rain was a regular part of the month, showing up on 21 days on average. Averages hide a lot here: one year saw 11, another 28.
28 days past 30°C made it a month for early starts and a long lunch indoors.
Typhoons i 4 of the last 20 years had a tropical storm pass within 300 km this month.
Mangkhut (2018), 99 km away typhoon strength Phanfone (2014), 136 km away tropical storm Choi-Wan (2009), 207 km away typhoon strength 1 2 1 3 2 4 3 5 6 3 7 4 8 4 9 7 10 2 11 12
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Wednesday 1 rain in 14 of 20 yrs 14/20 31° 25° September 2 Thursday 2 rain in 15 of 20 yrs 15/20 31° 25° September 3 Friday 3 rain in 15 of 20 yrs 15/20 31° 25° September 4 Saturday 4 rain in 11 of 20 yrs 11/20 31° 25° 1-4 rain on 69% of days 31° 25°
September 5 Sunday 5 rain in 14 of 20 yrs 14/20 31° 25° September 6 Monday 6 rain in 11 of 20 yrs 11/20 31° 25° September 7 Tuesday 7 rain in 10 of 20 yrs 10/20 31° 25° September 8 Wednesday 8 rain in 14 of 20 yrs 14/20 31° 25° September 9 Thursday 9 rain in 13 of 20 yrs 13/20 31° 25° September 10 Friday 10 rain in 15 of 20 yrs 15/20 31° 25° September 11 Saturday 11 rain in 15 of 20 yrs 15/20 31° 25° 5-11 rain on 66% of days 31° 25°
September 12 Sunday 12 rain in 17 of 20 yrs 17/20 31° 25° September 13 Monday 13 rain in 15 of 20 yrs 15/20 31° 25° September 14 Tuesday 14 rain in 12 of 20 yrs 12/20 31° 25° September 15 Wednesday 15 rain in 14 of 20 yrs 14/20 31° 25° September 16 Thursday 16 rain in 16 of 20 yrs 16/20 31° 25° September 17 Friday 17 rain in 15 of 20 yrs 15/20 31° 25° September 18 Saturday 18 rain in 15 of 20 yrs 15/20 31° 25° 12-18 rain on 74% of days 31° 25°
September 19 Sunday 19 rain in 18 of 20 yrs 18/20 31° 25° September 20 Monday 20 rain in 15 of 20 yrs 15/20 31° 25° September 21 Tuesday 21 rain in 13 of 20 yrs 13/20 31° 25° September 22 Wednesday 22 rain in 14 of 20 yrs 14/20 31° 25° September 23 Thursday 23 rain in 18 of 20 yrs 18/20 31° 25° September 24 Friday 24 rain in 12 of 20 yrs 12/20 31° 25° September 25 Saturday 25 rain in 13 of 20 yrs 13/20 31° 25° 19-25 rain on 74% of days 31° 25°
September 26 Sunday 26 rain in 12 of 20 yrs 12/20 31° 25° September 27 Monday 27 rain in 13 of 20 yrs 13/20 31° 25° September 28 Tuesday 28 rain in 15 of 20 yrs 15/20 31° 25° September 29 Wednesday 29 rain in 16 of 20 yrs 16/20 31° 25° September 30 Thursday 30 rain in 14 of 20 yrs 14/20 31° 25°
26-30 rain on 70% of days 31° 25°
Rain was common on almost every date this month, so the shades compare dates within this month.
1-4 rain on 69% of days 31° 25° 5-11 rain on 66% of days 31° 25° 12-18 rain on 74% of days 31° 25° 19-25 rain on 74% of days 31° 25° 26-30 rain on 70% of days 31° 25°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Friday 1 rain in 14 of 20 yrs 14/20 31° 25° September 2 Saturday 2 rain in 15 of 20 yrs 15/20 31° 25° 1-2 rain on 73% of days 31° 25°
September 3 Sunday 3 rain in 15 of 20 yrs 15/20 31° 25° September 4 Monday 4 rain in 11 of 20 yrs 11/20 31° 25° September 5 Tuesday 5 rain in 14 of 20 yrs 14/20 31° 25° September 6 Wednesday 6 rain in 11 of 20 yrs 11/20 31° 25° September 7 Thursday 7 rain in 10 of 20 yrs 10/20 31° 25° September 8 Friday 8 rain in 14 of 20 yrs 14/20 31° 25° September 9 Saturday 9 rain in 13 of 20 yrs 13/20 31° 25° 3-9 rain on 63% of days 31° 25°
September 10 Sunday 10 rain in 15 of 20 yrs 15/20 31° 25° September 11 Monday 11 rain in 15 of 20 yrs 15/20 31° 25° September 12 Tuesday 12 rain in 17 of 20 yrs 17/20 31° 25° September 13 Wednesday 13 rain in 15 of 20 yrs 15/20 31° 25° September 14 Thursday 14 rain in 12 of 20 yrs 12/20 31° 25° September 15 Friday 15 rain in 14 of 20 yrs 14/20 31° 25° September 16 Saturday 16 rain in 16 of 20 yrs 16/20 31° 25° 10-16 rain on 74% of days 31° 25°
September 17 Sunday 17 rain in 15 of 20 yrs 15/20 31° 25° September 18 Monday 18 rain in 15 of 20 yrs 15/20 31° 25° September 19 Tuesday 19 rain in 18 of 20 yrs 18/20 31° 25° September 20 Wednesday 20 rain in 15 of 20 yrs 15/20 31° 25° September 21 Thursday 21 rain in 13 of 20 yrs 13/20 31° 25° September 22 Friday 22 rain in 14 of 20 yrs 14/20 31° 25° September 23 Saturday 23 rain in 18 of 20 yrs 18/20 31° 25° 17-23 rain on 77% of days 31° 25°
September 24 Sunday 24 rain in 12 of 20 yrs 12/20 31° 25° September 25 Monday 25 rain in 13 of 20 yrs 13/20 31° 25° September 26 Tuesday 26 rain in 12 of 20 yrs 12/20 31° 25° September 27 Wednesday 27 rain in 13 of 20 yrs 13/20 31° 25° September 28 Thursday 28 rain in 15 of 20 yrs 15/20 31° 25° September 29 Friday 29 rain in 16 of 20 yrs 16/20 31° 25° September 30 Saturday 30 rain in 14 of 20 yrs 14/20 31° 25° 24-30 rain on 68% of days 31° 25°
Rain was common on almost every date this month, so the shades compare dates within this month.
1-2 rain on 73% of days 31° 25° 3-9 rain on 63% of days 31° 25° 10-16 rain on 74% of days 31° 25° 17-23 rain on 77% of days 31° 25° 24-30 rain on 68% of days 31° 25°
Tap another date to change
2006 4mm
2007 17mm
2008 14mm
2009 47mm
2010 3mm
2011 19mm
2012 8mm
2013 31mm
2014 9mm
2015 12mm
2016 1mm
2017 1mm
2018 10mm
2019 6mm
2020 15mm
2021 none
2022 53mm
2023 none
2024 15mm
2025 5mm
Holidays in September (2027) 1 Local public holiday or break (busier, pricier)
Your trip dates, the past 20 years Trip dates September 1 (Wed) 2 (Thu) 3 (Fri) 4 (Sat) 5 (Sun) 6 (Mon) 7 (Tue) 8 (Wed) 9 (Thu) 10 (Fri) 11 (Sat) 12 (Sun) 13 (Mon) 14 (Tue) 15 (Wed) 16 (Thu) 17 (Fri) 18 (Sat) 19 (Sun) 20 (Mon) 21 (Tue) 22 (Wed) 23 (Thu) 24 (Fri) 25 (Sat) 26 (Sun) 27 (Mon) 28 (Tue) 29 (Wed) 30 (Thu) ~ September 1 (Wed) 2 (Thu) 3 (Fri) 4 (Sat) 5 (Sun) 6 (Mon) 7 (Tue) 8 (Wed) 9 (Thu) 10 (Fri) 11 (Sat) 12 (Sun) 13 (Mon) 14 (Tue) 15 (Wed) 16 (Thu) 17 (Fri) 18 (Sat) 19 (Sun) 20 (Mon) 21 (Tue) 22 (Wed) 23 (Thu) 24 (Fri) 25 (Sat) 26 (Sun) 27 (Mon) 28 (Tue) 29 (Wed) 30 (Thu) 1-7 8-14 15-21 22-end Whole month
You can also click two dates on the axis. Hover a cell to see that day's rain. By year Driest trips first
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Trip rain days Month rain days Tap a date to start, tap another to end. Each cell is that date in one year. '06 '07 '08 '09 '10 '11 '12 '13 '14 '15 '16 '17 '18 '19 '20 '21 '22 '23 '24 '25
of 20 1 Wed Pick September 1
14 2 Thu Pick September 2
15 3 Fri Pick September 3
15 4 Sat Pick September 4
11 5 Sun Pick September 5
14 6 Mon Pick September 6
11 7 Tue Pick September 7
10 8 Wed Pick September 8
14 9 Thu Pick September 9
13 10 Fri Pick September 10
15 11 Sat Pick September 11
15 12 Sun Pick September 12
17 13 Mon Pick September 13
15 14 Tue Pick September 14
12 15 Wed Pick September 15
14 16 Thu Pick September 16
16 17 Fri Pick September 17
15 18 Sat Pick September 18
15 19 Sun Pick September 19
18 20 Mon Pick September 20
15 21 Tue Pick September 21
13 22 Wed Pick September 22
14 23 Thu Pick September 23
18 24 Fri Pick September 24
12 25 Sat Pick September 25
13 26 Sun Pick September 26
12 27 Mon Pick September 27
13 28 Tue Pick September 28
15 29 Wed Pick September 29
16 30 Thu Pick September 30
14 Dates outside your trip are dimmed.
One row per year, one cell per day. 2021 had 11 rain days, 2016 had 28.
Saipan through the year Month High Low Rain days Rainfall Sea January Good 29° 24° 13 days 110mm 28° February Good 29° 24° 11 days 62mm 28° March Good 30° 24° 12 days 69mm 28° April 31° 25° 12 days 77mm 29° May 31° 26° 14 days 89mm 29° June 31° 26° 16 days 106mm 30° July 31° 26° 21 days 218mm 30° August 31° 25° 20 days 342mm 30° September 31° 25° 21 days 312mm 30° October 30° 25° 23 days 326mm 30° November 30° 25° 16 days 107mm 30° December 30° 25° 15 days 77mm 29°
What to pack Loose, light-colored clothes, sandals and a hat did most of the work at 31°C. Sights went in the morning, with a break in the middle of the day.
With rain every other day, a waterproof jacket is a necessity, not extra luggage. One compact umbrella is enough besides.
Common questions Does it rain a lot in Saipan in September? Over the past 20 years September averaged 21 rain days (1 mm or more) out of 30. Individual years ran from 11 in the driest to 28 in the wettest.
What should I wear in Saipan in September? Days averaged 31°C and nights 25°C. Pack an umbrella, sandals that can get wet, T-shirts, sunscreen plus a hat, a swimsuit, and insect repellent.
Can you swim in Saipan in September? Sea surface temperature averaged 30°C in September, warm enough to stay in for a long swim. Year to year it ranged 29.8-30.4°C. Check local flags for waves and jellyfish on the day.
Is September a good time to visit Saipan? On warmth and rain days alone, Saipan's easiest months were January to March. September ranked 10 of 12.
Is Saipan humid in September? Mean relative humidity was 83%, with about 30 muggy days (dew point of 20°C or more) in the month.
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