Johnston Atoll climate and temperatures

The climate of Johnston Atoll is a tropical savanna climate (Köppen: Aw), characterized by consistently warm temperatures and a dry winter season. Monthly temperatures range from a minimum of 26°C in January to a maximum of 28°C in July. The average annual temperature is around 28°C.

During the colder months, nighttime temperatures average around 24°C, while in the warmer months they average about 27°C.

Climate table of Johnston Atoll

The climate table below gives you a clear overview of the climate in Johnston Atoll by month, from average temperatures and rainfall to UV levels. This makes it easy to see when the weather best suits your travel plans.

Best time to visit Johnston Atoll

The best time to visit Johnston Atoll is January, February en June. During this period, temperatures are usually pleasant to warm and there is relatively little rainfall. Between January and June, average high temperatures range roughly from 26°C to 27°C, while rainfall remains limited. For a sun or beach holiday, January, February en June are the most suitable months. It is often warm to hot and relatively dry during this time. For a city trip, round trip, or active holiday, January, February en June are often more comfortable, as it is warm without the heat becoming too intense. The warmest month is July, with an average daytime temperature of around 28°C. The driest month is January, with about 32 mm of rainfall, while September is usually the wettest month of the year, with approximately 144 mm. Snow plays virtually no role in the climate here.

Average temperature per month

This chart shows the average daytime (maximum) and nighttime (minimum) temperatures per month in Johnston Atoll. The figures are based on climate data from recent years and are presented in degrees Celsius, so you can clearly see the temperature range for each month.

Average rainfall per month

This chart shows the average monthly rainfall in Johnston Atoll. The figures are based on long-term climate data and are displayed in millimeters, so you can immediately see which months are drier or wetter.

Average UV index per month

This chart shows the average monthly sun intensity in Johnston Atoll. The UV index ranges from 0 (no UV radiation) to 11+ (extreme). A higher UV index means you can burn more quickly, making proper sun protection increasingly important.

Average annual temperature

This chart shows the average annual temperature in Johnston Atoll based on data from the past ten years. It allows you to see at a glance how the climate is evolving and whether there are clear warming trends.

Average annual rainfall

This chart shows the average annual rainfall in Johnston Atoll over the past ten years. It allows you to see at a glance how much rain falls each year and whether there are clear fluctuations between the years.

Weather experiences in Johnston Atoll

The weather in Johnston Atoll is rated an average of 4.3 out of 5 stars by 8 visitors. Have you been to Johnston Atoll? Share your experience with the weather to help other visitors plan their trip.

Average weather per month

Click on a month below and discover what the weather in Johnston Atoll is typically like. For each period, you can instantly see the average temperature, rainfall, wind, and UV index. Thanks to years of historical weather data, you’ll know exactly what to expect during your trip.

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