Saipan weather in September

In September, Saipan sees average daytime highs of 28°C and overnight lows near 26°C, with 298 mm of rain across 26.6 wet days and about 12.1 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 10% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Saipan's 11th-clearest and 12th-windiest month. For the whole year in context, see Saipan's year-round climate.

Daytime high: 28°; 3rd warmest
Overnight low: 26°; 7th coldest
Rainfall: 298 mm; 26.6 wet days
Daylight: 12 h 06 min; 6:09 AM – 6:14 PM
Cloud cover: 83%; 11th clearest
Wind: 19 km/h; 12th windiest
Solar energy: 5.25 kWh/m²
Travel score: 3.4; out of 10

Saipan is city.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Saipan year-round climate October →Best places to visit in September

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Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Saipan reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

	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
Avg high (°C)	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28
Avg low (°C)	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26

	Avg high (°C)	Avg low (°C)
1	28	26
2	28	26
3	28	26
4	28	26
5	28	26
6	28	26
7	28	26
8	28	26
9	28	26
10	28	26
11	28	26
12	28	26
13	28	26
14	28	26
15	28	26
16	28	26
17	28	26
18	28	26
19	28	26
20	28	26
21	28	26
22	28	26
23	28	26
24	28	26
25	28	26
26	28	26
27	28	26
28	28	26
29	28	26
30	28	26

How September really feels in Saipan

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Saipan weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 3rd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	27° / 26°	61	13.3	11.2	6.2
Feb	27° / 26°	39	11.3	11.5	6.5
Mar	27° / 26°	38	9.8	11.9	6.9
Apr	27° / 26°	50	10.4	12.3	6.7
May	28° / 27°	64	13.2	12.7	6.0
Jun	28° / 27°	100	17.9	12.9	4.7
Jul	28° / 27°	223	27	12.8	3.5
Aug	28° / 26°	340	28.2	12.5	3.3
Sep	28° / 26°	298	26.6	12.1	3.4
Oct	28° / 27°	304	25.6	11.7	3.8
Nov	28° / 27°	133	19	11.3	4.9
Dec	28° / 26°	67	14.8	11.1	6.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 8% of September, with mostly cloudy or overcast conditions the remaining 82%. Skies tend to open up as the month goes on.

	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
Clearer (%)	16	16	16	16	16	15	15	15	15	15	15	15	15	15	15	15	16	17	18	18	18	20	21	22	22	24	24	24	25	26
Cloudier (%)	84	84	84	84	84	85	85	85	85	85	85	85	85	85	85	85	84	83	82	82	82	80	79	78	78	76	76	76	75	74

	Clearer (%)	Cloudier (%)
1	16	84
2	16	84
3	16	84
4	16	84
5	16	84
6	15	85
7	15	85
8	15	85
9	15	85
10	15	85
11	15	85
12	15	85
13	15	85
14	15	85
15	15	85
16	15	85
17	16	84
18	17	83
19	18	82
20	18	82
21	18	82
22	20	80
23	21	79
24	22	78
25	22	78
26	24	76
27	24	76
28	24	76
29	25	75
30	26	74

Chance of precipitation in September

Any precipitation

Saipan gets around 298 mm of rain over 26.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 89% and peaks near 90% on the wettest days.

	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
Rain chance (%)	88	88	88	88	88	89	89	89	88	88	88	88	88	88	88	88	88	88	88	88	88	88	89	89	90	90	90	90	90	90

	Rain chance (%)
1	88
2	88
3	88
4	88
5	88
6	89
7	89
8	89
9	88
10	88
11	88
12	88
13	88
14	88
15	88
16	88
17	88
18	88
19	88
20	88
21	88
22	88
23	89
24	89
25	90
26	90
27	90
28	90
29	90
30	90

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the miserable band about 83% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	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
Oppressive (%)	15	15	15	16	16	16	17	17	17	18	18	19	19	19	19	19	18	18	18	17	17	16	16	16	16	16	16	16	16	16
Miserable (%)	85	85	85	84	84	84	83	83	83	82	82	81	81	81	81	81	82	82	82	83	83	84	84	84	84	84	84	84	84	84

	Oppressive (%)	Miserable (%)
1	15	85
2	15	85
3	15	85
4	16	84
5	16	84
6	16	84
7	17	83
8	17	83
9	17	83
10	18	82
11	18	82
12	19	81
13	19	81
14	19	81
15	19	81
16	19	81
17	18	82
18	18	82
19	18	82
20	17	83
21	17	83
22	16	84
23	16	84
24	16	84
25	16	84
26	16	84
27	16	84
28	16	84
29	16	84
30	16	84

Wind in September

Winds average 19 km/h in September, the calmest month.

Across September, daily wind ranges from about 18 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

	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
Wind speed (km/h)	18	18	18	18	18	18	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	20	20	20	20	20	20	20	20
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	breezy	breezy	breezy

	Wind speed (km/h)	Feels
1	18	light breeze
2	18	light breeze
3	18	light breeze
4	18	light breeze
5	18	light breeze
6	18	light breeze
7	19	light breeze
8	19	light breeze
9	19	light breeze
10	19	light breeze
11	19	light breeze
12	19	light breeze
13	19	light breeze
14	19	light breeze
15	19	light breeze
16	19	light breeze
17	19	light breeze
18	19	light breeze
19	19	light breeze
20	19	light breeze
21	19	light breeze
22	19	light breeze
23	20	light breeze
24	20	light breeze
25	20	light breeze
26	20	light breeze
27	20	light breeze
28	20	breezy
29	20	breezy
30	20	breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 6:08 AM to 6:10 AM, and sunset from 6:26 PM to 6:03 PM.

	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
Daylight (h)	12.3	12.3	12.3	12.3	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.9
Sunrise (AM)	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:10	6:10	6:10	6:10	6:10
Sunset (PM)	6:26	6:25	6:24	6:23	6:23	6:22	6:21	6:20	6:19	6:19	6:18	6:17	6:16	6:15	6:15	6:14	6:13	6:12	6:11	6:11	6:10	6:09	6:08	6:07	6:07	6:06	6:05	6:04	6:03	6:03

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.3	6:08	6:26
2	12.3	6:08	6:25
3	12.3	6:08	6:24
4	12.3	6:08	6:23
5	12.2	6:08	6:23
6	12.2	6:08	6:22
7	12.2	6:08	6:21
8	12.2	6:08	6:20
9	12.2	6:08	6:19
10	12.2	6:08	6:19
11	12.2	6:08	6:18
12	12.1	6:09	6:17
13	12.1	6:09	6:16
14	12.1	6:09	6:15
15	12.1	6:09	6:15
16	12.1	6:09	6:14
17	12.1	6:09	6:13
18	12.1	6:09	6:12
19	12.0	6:09	6:11
20	12.0	6:09	6:11
21	12.0	6:09	6:10
22	12.0	6:09	6:09
23	12.0	6:09	6:08
24	12.0	6:09	6:07
25	12.0	6:09	6:07
26	11.9	6:10	6:06
27	11.9	6:10	6:05
28	11.9	6:10	6:04
29	11.9	6:10	6:03
30	11.9	6:10	6:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.25 kWh/m².

For context, solar energy here swings from a low near 4.72 kWh/m² to a high of 6.76 kWh/m² in May across the year — September's 5.25 kWh/m² falls in the middle.

	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
Solar energy (kWh/m²)	5.4	5.4	5.4	5.4	5.4	5.4	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.1	5.1	5.1
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.4	Bright
2	5.4	Bright
3	5.4	Bright
4	5.4	Bright
5	5.4	Bright
6	5.4	Bright
7	5.3	Bright
8	5.3	Bright
9	5.3	Bright
10	5.3	Bright
11	5.3	Bright
12	5.3	Bright
13	5.3	Bright
14	5.2	Bright
15	5.2	Bright
16	5.2	Bright
17	5.2	Bright
18	5.2	Bright
19	5.2	Bright
20	5.2	Bright
21	5.2	Bright
22	5.2	Bright
23	5.2	Bright
24	5.2	Bright
25	5.2	Bright
26	5.2	Bright
27	5.2	Bright
28	5.1	Bright
29	5.1	Bright
30	5.1	Bright

Planning a trip in September

Hazard calendar for Saipan

In seasonPeak

In September, Saipan sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.

Saipan sits in the Pacific typhoon belt; the season peaks July–October.

Saipan's monsoon runs July–October, when most of the year's rain falls.

Pacific typhoon

Monsoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Saipan?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.4

Sightseeing

11th-best month of the year

4.0

Beach & pool

11th-best month of the year

September is a weaker month for outdoor sightseeing in Saipan.

What to pack for Saipan in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Saipan sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

Sea temperature near Saipan in September

The nearest coast averages about 30°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in September at about 30°C and coldest in February near 27°C.

The water stays above 20°C all year — warm enough for a swim any month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	28	27	27	28	29	29	29	29	30	29	29	28
Comfort	Warm	Warm	Warm	Warm	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical

	Sea temperature (°C)	Comfort
Jan	28	Warm
Feb	27	Warm
Mar	27	Warm
Apr	28	Warm
May	29	Tropical
Jun	29	Tropical
Jul	29	Tropical
Aug	29	Tropical
Sep	30	Tropical
Oct	29	Tropical
Nov	29	Tropical
Dec	28	Tropical

UV index in Saipan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Saipan peaks around August 16 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 9 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	9	11	13	13	12	12	13	13	13	12	10	8
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	9	Very high
Feb	11	Extreme
Mar	13	Extreme
Apr	13	Extreme
May	12	Extreme
Jun	12	Extreme
Jul	13	Extreme
Aug	13	Extreme
Sep	13	Extreme
Oct	12	Extreme
Nov	10	Very high
Dec	8	Very high

Location & terrain

Where is Saipan?

Saipan sits at 15.2°N, 145.8°E, 5 m above sea level, in Northern Mariana Islands. The nearest listed city is Yigo Village, 208 km away.

Topography around Saipan

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saipan.

Within 3 km, the terrain around Saipan has significant variations in elevation — a maximum elevation change of 454 m around an average of 123 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 454 m; within 80 km, significant variations in elevation — a maximum elevation change of 446 m.

The land around Saipan is covered by trees (74%) within 3 km, water (86%) within 16 km, and water (97%) within 80 km.

3 km

454 m

trees 74%

16 km

454 m

water 86%

80 km

446 m

water 97%

treesgrasslandartificial surfaceswater

← August Saipan year-round climate October →Best places to visit in September

September weather nearby: Yigo Village 208 km · Dededo Village 213 km · Tamuning-Tumon-Harmon Village 219 km · Tumon 219 km · Hagatna 221 km · Mangilao Village 221 km · Ngerulmud 1,485 km · Koror 1,509 km

Northern Mariana Islands travel facts

GDP per capita: $23,786; 2022
Safe drinking water: 81%; of population, 2024
Income group: High; World Bank

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Saipan (15.2123°, 145.7545°, elevation 5 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	28	26
2	28	26
3	28	26
4	28	26
5	28	26
6	28	26
7	28	26
8	28	26
9	28	26
10	28	26
11	28	26
12	28	26
13	28	26
14	28	26
15	28	26
16	28	26
17	28	26
18	28	26
19	28	26
20	28	26
21	28	26
22	28	26
23	28	26
24	28	26
25	28	26
26	28	26
27	28	26
28	28	26
29	28	26
30	28	26

	Clearer (%)	Cloudier (%)
1	16	84
2	16	84
3	16	84
4	16	84
5	16	84
6	15	85
7	15	85
8	15	85
9	15	85
10	15	85
11	15	85
12	15	85
13	15	85
14	15	85
15	15	85
16	15	85
17	16	84
18	17	83
19	18	82
20	18	82
21	18	82
22	20	80
23	21	79
24	22	78
25	22	78
26	24	76
27	24	76
28	24	76
29	25	75
30	26	74

	Rain chance (%)
1	88
2	88
3	88
4	88
5	88
6	89
7	89
8	89
9	88
10	88
11	88
12	88
13	88
14	88
15	88
16	88
17	88
18	88
19	88
20	88
21	88
22	88
23	89
24	89
25	90
26	90
27	90
28	90
29	90
30	90

	Oppressive (%)	Miserable (%)
1	15	85
2	15	85
3	15	85
4	16	84
5	16	84
6	16	84
7	17	83
8	17	83
9	17	83
10	18	82
11	18	82
12	19	81
13	19	81
14	19	81
15	19	81
16	19	81
17	18	82
18	18	82
19	18	82
20	17	83
21	17	83
22	16	84
23	16	84
24	16	84
25	16	84
26	16	84
27	16	84
28	16	84
29	16	84
30	16	84

	Avg high (°C)	Avg low (°C)
1	28	26
2	28	26
3	28	26
4	28	26
5	28	26
6	28	26
7	28	26
8	28	26
9	28	26
10	28	26
11	28	26
12	28	26
13	28	26
14	28	26
15	28	26
16	28	26
17	28	26
18	28	26
19	28	26
20	28	26
21	28	26
22	28	26
23	28	26
24	28	26
25	28	26
26	28	26
27	28	26
28	28	26
29	28	26
30	28	26

	Clearer (%)	Cloudier (%)
1	16	84
2	16	84
3	16	84
4	16	84
5	16	84
6	15	85
7	15	85
8	15	85
9	15	85
10	15	85
11	15	85
12	15	85
13	15	85
14	15	85
15	15	85
16	15	85
17	16	84
18	17	83
19	18	82
20	18	82
21	18	82
22	20	80
23	21	79
24	22	78
25	22	78
26	24	76
27	24	76
28	24	76
29	25	75
30	26	74

	Rain chance (%)
1	88
2	88
3	88
4	88
5	88
6	89
7	89
8	89
9	88
10	88
11	88
12	88
13	88
14	88
15	88
16	88
17	88
18	88
19	88
20	88
21	88
22	88
23	89
24	89
25	90
26	90
27	90
28	90
29	90
30	90

	Oppressive (%)	Miserable (%)
1	15	85
2	15	85
3	15	85
4	16	84
5	16	84
6	16	84
7	17	83
8	17	83
9	17	83
10	18	82
11	18	82
12	19	81
13	19	81
14	19	81
15	19	81
16	19	81
17	18	82
18	18	82
19	18	82
20	17	83
21	17	83
22	16	84
23	16	84
24	16	84
25	16	84
26	16	84
27	16	84
28	16	84
29	16	84
30	16	84

	Avg high (°C)	Avg low (°C)
1	28	26
2	28	26
3	28	26
4	28	26
5	28	26
6	28	26
7	28	26
8	28	26
9	28	26
10	28	26
11	28	26
12	28	26
13	28	26
14	28	26
15	28	26
16	28	26
17	28	26
18	28	26
19	28	26
20	28	26
21	28	26
22	28	26
23	28	26
24	28	26
25	28	26
26	28	26
27	28	26
28	28	26
29	28	26
30	28	26

	Clearer (%)	Cloudier (%)
1	16	84
2	16	84
3	16	84
4	16	84
5	16	84
6	15	85
7	15	85
8	15	85
9	15	85
10	15	85
11	15	85
12	15	85
13	15	85
14	15	85
15	15	85
16	15	85
17	16	84
18	17	83
19	18	82
20	18	82
21	18	82
22	20	80
23	21	79
24	22	78
25	22	78
26	24	76
27	24	76
28	24	76
29	25	75
30	26	74

	Rain chance (%)
1	88
2	88
3	88
4	88
5	88
6	89
7	89
8	89
9	88
10	88
11	88
12	88
13	88
14	88
15	88
16	88
17	88
18	88
19	88
20	88
21	88
22	88
23	89
24	89
25	90
26	90
27	90
28	90
29	90
30	90

	Oppressive (%)	Miserable (%)
1	15	85
2	15	85
3	15	85
4	16	84
5	16	84
6	16	84
7	17	83
8	17	83
9	17	83
10	18	82
11	18	82
12	19	81
13	19	81
14	19	81
15	19	81
16	19	81
17	18	82
18	18	82
19	18	82
20	17	83
21	17	83
22	16	84
23	16	84
24	16	84
25	16	84
26	16	84
27	16	84
28	16	84
29	16	84
30	16	84