Arno Atoll Temperature by Month

The average annual maximum temperature in Arno Atoll, Marshall Islands is 29°C (84°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how Arno Atoll compares to cities worldwide.

Arno Atoll enjoys a stable climate with temperatures staying pretty much the same throughout the year. Maximum daytime temperatures range from a comfortable 29°C (84°F) in February to a comfortable 29°C (84°F) in September. Nights are consistently cool, with lows between 26°C (79°F) and 26°C (79°F).

The chart below illustrates the average maximum day and minimum night temperatures in Arno Atoll by month:

From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. September, the warmest month, averages 218 hours of sunshine.

The chart below shows the average temperature throughout the year:

Arno Atoll's average annual maximum temperature is 29°C (84°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Arno Atoll, February is the coolest month, with average highs of 29°C (84°F) and humidity around 77%, considered high. In September, the warmest month, temperatures average 29°C (84°F) with 79% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Arno Atoll this rarely lasts long on the ground.

For more on Arno Atoll's weather, including monthly rainfall, sunshine hours, and humidity, visit our Arno Atoll climate page.