Usa River Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Usa River, Tanzania. Long-term data from 1990 to 2020 was used to calculate these averages. Now, let's explore all the details to give you a full picture.
Usa River experiences significant rainfall throughout the year, averaging 1015 mm (40 in) of precipitation annually. However, this abundant rainfall is not evenly distributed, with a distinct dry season during certain months. You can clearly see this in our monthly precipitation graphs below.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Usa River can be quite wet during April, receiving approximately 188 mm (7.4 in) of precipitation over 19 rainy days.
In contrast September, experiences much drier conditions, with 12 mm (0.5 in) of rainfall, spread across 3 rainy days.
April, the wettest month, has a maximum daytime temperature of 26°C (79°F). During the driest month September you can expect a temperature of 26°C (79°F). For more detailed insights into the city's temperatures, visit our Usa River Temperature page.
Daily Historical Precipitation
47-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in July
Explore Usa River's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Usa River spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Tanzania: City Comparison
The map below shows the annual precipitation across Tanzania. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Usa River vs World: Rainfall Compared
Usa River's average annual precipitation is 1015 mm (40 in). Let's compare this to some popular worldwide tourist destinations:
Seville, Spain, experiences 541 mm (21 in) of rainfall annually, with wet winters and dry summers typical of southern Spain.
In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.
Perth, Australia, receives 565 mm (22 in) of rainfall annually, mostly during the winter months.
Singapore, situated near the equator, gets 2581 mm (102 in) of rainfall annually, with no distinct dry season and consistent monthly precipitation.
Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.
Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.
Precipitation has a very strong role in determining the local climate and ecosystem:
- Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
- Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.
- "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
- The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
- The greatest snowfall recorded was on Mt. Rainier, Washington State, USA—over 31.5 meters (103 feet) fell during the winter of 1972.
For more detailed information about Usa River's weather, including sunshine hours, humidity levels, and temperature data, visit our Usa River Climate page.
