Waisai climate — normals and trends
Waisai (Indonesia) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 26.2 °C and it receives 2,922 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is April (26.4 °C on average) and the coldest is July (25.8 °C). Rainfall peaks in May.
Waisai averages 0 frost days, 2 hot days (≥ 30 °C) and 312 rainy days per year.
Waisai has warmed by +1.2 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 31.0 °C (on 20 November 2021) and the coldest 23.2 °C (on 26 March 1943).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
WaisaiSouthwest Papua
- coords
- -0.24°, 130.51°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.2°C
Average daily high
27.7°C
Average daily low
25.1°C
Annual rainfall
2,922mm
Sunshine / day
10.2h
Mean relative humidity
85%
Average peak wind
12.8km/h
Seasonal range
0.6°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
312 d/yr
Annual snowfall
0.0 cm
Average feels-like high
33.5 °C
Average feels-like low
29.2 °C
Average peak gust
26.8 km/h
Tropical nights (≥ 20 °C)
365 d/yr
Solar radiation
19.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.74 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
31.0 °C
20 November 2021
Coldest day
23.2 °C
26 March 1943
Wettest day
172 mm
11 March 2012
Windiest day
33.5 km/h
15 August 1957
Strongest gust
63.7 km/h
22 June 1982
Hottest feels-like
39.7 °C
29 October 2024
Coldest feels-like
24.4 °C
24 July 1982
Sunniest day
12.0 h
18 October 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 29.1 °C | +1.4 °C | 372 mm | +133 mm |
| Feb | 29.2 °C | +1.5 °C | 198 mm | -5 mm |
| Mar | 29.2 °C | +1.3 °C | 311 mm | +61 mm |
| Apr | 28.6 °C | +0.7 °C | 456 mm | +181 mm |
| May | 29.0 °C | +1.0 °C | 353 mm | +59 mm |
| Jun | 28.5 °C | +0.9 °C | 347 mm | +66 mm |
| Jul | 28.2 °C | +1.0 °C | 318 mm | +77 mm |
| Aug | 27.7 °C | +0.5 °C | 650 mm | +433 mm |
| Sep | 28.3 °C | +0.8 °C | 470 mm | +254 mm |
| Oct | 28.6 °C | +0.7 °C | 492 mm | +281 mm |
| Nov | 28.8 °C | +0.9 °C | 289 mm | +61 mm |
| Dec | 28.6 °C | +0.8 °C | 315 mm | +48 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Waisai?
Waisai has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 26.2 °C and it receives 2,922 mm of precipitation per year.
What is the hottest day ever recorded in Waisai?
The hottest day measured in Waisai between 1940 and 2025 was 20 November 2021, reaching 31.0 °C.
What is the coldest day in Waisai?
The coldest day measured in Waisai between 1940 and 2025 was 26 March 1943, at 23.2 °C.
Does it snow in Waisai?
Almost never: Waisai sees virtually no snow, with about 0 frost days per year.
Has the climate of Waisai warmed?
Yes: Waisai warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Waisai?
The wettest day measured in Waisai between 1940 and 2025 was 11 March 2012, with 172 mm of rain in 24 hours.
What was the windiest day in Waisai?
The windiest day measured in Waisai between 1940 and 2025 was 15 August 1957, with winds reaching 33.5 km/h.
What is the warmest month in Waisai?
The warmest month in Waisai is April (26.4 °C on average); the coldest is July (25.8 °C).
How much does it rain in Waisai?
Waisai receives on average 2,922 mm of precipitation per year, spread over about 312 rainy days.
Is it sunny in Waisai?
Waisai gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
Are there tropical nights in Waisai?
Yes: Waisai has on average 365 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Waisai?
In Waisai, between 1940 and 2025, the highest apparent temperature reached 39.7 °C on 29 October 2024, and the lowest was 24.4 °C on 24 July 1982.
Compare Waisai with another city
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Nearby cities
The climate around Waisai