Kwajalein Weather in September

September in Kwajalein typically sees daytime highs of 29°C (84°F) and nighttime lows of 26°C (79°F). September falls within the rainy season, so heavy rainfall is to be expected.

Rainfall in Kwajalein in September

As part of the rainy season, Kwajalein sees around 20 days of rain in September, with an average of 295 mm (12 in). Showers during the rainy season tend to be heavy and can come down intensely. An umbrella is often not enough, so a poncho or waterproof jacket is a better choice.

Temperature in Kwajalein in September

In September, Kwajalein sees high temperatures, with highs of 29°C (84°F). Nights drop to around 26°C (79°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights remain warm at around 26°C (79°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference.

Wind Speed in Kwajalein in September

Average wind speeds reach 3 m/s (6 knots) in September, creating light breezes that feel pleasant throughout the day. Some days are calmer, while others bring slightly more active breezes.

Average water temperature in September

The water is 29°C (84°F) — very warm by most standards. Comfortable to swim in, but not particularly refreshing if you're looking to cool off.

If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Kwajalein. Our weather planner can help you explore destinations with more pleasant weather conditions.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Marshall Islands, check out our Kwajalein's climate page.

Kwajalein Temperature in September

Min Temperature 26°C (79°F)  

Max Temperature 29°C (84°F)  

Water Temperature 29°C (84°F)  

Chance of Rain 65%  

Precipitation 295 mm (12 in)  

Rainy days 20 days  

Humidity 81%  

Windspeed 3 m/s (6 knots)  

Daily Historical Temperatures

46-year average (1976-2025)

Based on our historical records, temperatures in Kwajalein typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 26°C (79°F).

Average temperatures in September

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Daily Historical Precipitation

46-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Kwajalein in September

Browse day-by-day weather records for Kwajalein spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

‹ 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 ›

‹ January February March April May June July August September October November December ›

Kwajalein historical weather extremes in September

Based on 19 years of weather observations (2006-2025), these are the most extreme conditions recorded in Kwajalein.

• The hottest September day on record in Kwajalein reached 32°C (90°F) (September 15, 2020).
• On September 24, 2010, Kwajalein saw its coldest September day with temperatures maxing out at 27°C (81°F).
• The lowest overnight temperature recorded in September was 18°C (64°F) (September 22, 2023).
• The wettest September day on record brought 117 mm (4.6 in) of precipitation to Kwajalein (September 21, 2007).

What to Wear in Kwajalein in September

Warm but pleasant conditions in Kwajalein in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. With water temperatures around 29°C (84°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes.

What To Do in Kwajalein in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

7/10

Walking

7/10

Camping

7/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Marshall Islands, check out our Kwajalein's climate page.

More climate data for Kwajalein

Temperature Rainfall Humidity Wind Speed Water Temp

See the full Kwajalein climate overview or explore weather in Marshall Islands.