Rosario climate — normals and trends
Rosario (Philippines) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 26.6 °C and it receives 1,980 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 May (28.3 °C on average) and the coldest is January (25.0 °C). Rainfall peaks in September.
Rosario averages 0 frost days, 193 hot days (≥ 30 °C) and 236 rainy days per year.
Rosario has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The hottest day of the period reached 36.5 °C (on 19 May 1973) and the coldest 18.3 °C (on 21 December 1955).
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
RosarioCalabarzon
- coords
- 13.63°, 121.22°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.6°C
Average daily high
30.1°C
Average daily low
23.9°C
Annual rainfall
1,980mm
Sunshine / day
10.4h
Mean relative humidity
81%
Average peak wind
15.2km/h
Seasonal range
3.3°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
193 d/yr
Rainy days (≥ 1 mm)
236 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.2 °C
Average feels-like low
27.8 °C
Average peak gust
38.6 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
19.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.71 · 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
36.5 °C
19 May 1973
Coldest day
18.3 °C
21 December 1955
Wettest day
290 mm
9 September 1982
Windiest day
62.4 km/h
4 November 1967
Strongest gust
156.2 km/h
3 December 2019
Hottest feels-like
44.1 °C
7 May 2020
Coldest feels-like
18.4 °C
1 March 1963
Sunniest day
12.3 h
3 June 1946
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 28.7 °C | +0.6 °C | 116 mm | +65 mm |
| Feb | 29.2 °C | +0.1 °C | 111 mm | +72 mm |
| Mar | 30.5 °C | -0.1 °C | 115 mm | +71 mm |
| Apr | 33.1 °C | +1.0 °C | 30 mm | -21 mm |
| May | 32.9 °C | +0.6 °C | 156 mm | +24 mm |
| Jun | 31.3 °C | +0.1 °C | 367 mm | +142 mm |
| Jul | 30.5 °C | +0.2 °C | 349 mm | +43 mm |
| Aug | 31.0 °C | +0.8 °C | 459 mm | +179 mm |
| Sep | 29.7 °C | -0.4 °C | 477 mm | +169 mm |
| Oct | 30.5 °C | +0.7 °C | 357 mm | +111 mm |
| Nov | 30.2 °C | +1.1 °C | 289 mm | +133 mm |
| Dec | 29.5 °C | +1.2 °C | 111 mm | -32 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 Rosario?
Rosario has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 26.6 °C and it receives 1,980 mm of precipitation per year.
What is the hottest day ever recorded in Rosario?
The hottest day measured in Rosario between 1940 and 2025 was 19 May 1973, reaching 36.5 °C.
What is the coldest day in Rosario?
The coldest day measured in Rosario between 1940 and 2025 was 21 December 1955, at 18.3 °C.
Does it snow in Rosario?
Almost never: Rosario sees virtually no snow, with about 0 frost days per year.
Has the climate of Rosario warmed?
Yes: Rosario warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rosario?
The wettest day measured in Rosario between 1940 and 2025 was 9 September 1982, with 290 mm of rain in 24 hours.
What was the windiest day in Rosario?
The windiest day measured in Rosario between 1940 and 2025 was 4 November 1967, with winds reaching 62.4 km/h.
What is the warmest month in Rosario?
The warmest month in Rosario is May (28.3 °C on average); the coldest is January (25.0 °C).
How much does it rain in Rosario?
Rosario receives on average 1,980 mm of precipitation per year, spread over about 236 rainy days.
Is it sunny in Rosario?
Rosario gets on average 10.4 hours of sunshine per day, roughly 3,796 hours per year over 1940-2025.
Are there tropical nights in Rosario?
Yes: Rosario has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rosario?
In Rosario, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 7 May 2020, and the lowest was 18.4 °C on 1 March 1963.
Compare Rosario with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rosario