Costa Rica climate by month
8-year averages · when to visit
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|
| San José |
77° |
79° |
81° |
81° |
79° |
75° |
77° |
77° |
77° |
75° |
75° |
75° |
| Liberia (Guanacaste) |
90° |
91° |
95° |
95° |
91° |
86° |
88° |
88° |
86° |
84° |
86° |
88° |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|
| Liberia (Guanacaste) |
83° |
83° |
84° |
84° |
87° |
86° |
85° |
86° |
85° |
84° |
82° |
82° |
Figures are averaged over 8 years of ERA5 reanalysis; sea temps come from ocean reanalysis, and UV is derived from solar elevation.
San José climate in September
8-year averages · when to visit
Best months: January–December · September: Good
|
August |
September |
October |
| Average temperature |
→ 68°F |
68°F |
▼ 66°F |
| Typical high |
→ 77°F |
77°F |
▼ 75°F |
| Typical low |
▼ 63°F |
61°F |
→ 61°F |
| Precipitation |
▲ 16.3 in |
17.8 in |
▲ 21.5 in |
| Wet days |
▲ 27 d |
29 d |
→ 29 d |
| Humidity |
▲ 83% |
88% |
▲ 89% |
| Sunshine per day |
▼ 8.6 h |
8.2 h |
▼ 7.9 h |
| Cloud cover |
▲ 30% |
32% |
▲ 34% |
| Midday UV |
→ 12 |
12 |
▼ 11 |
| Daylight |
12:26 |
12:10 |
11:54 |
| Our take |
Good
|
Good
|
Good
|
September temperatures day by day daily mean + smoothed trend · °F
September precipitation day by day in
September UV day by day clear-sky midday value
Figures are averaged over 8 years of ERA5 reanalysis; sea temps come from ocean reanalysis, and UV is derived from solar elevation.
More destinations in North America & Caribbean
Costa Rica · 13 weather points · Climate reference: San José (9.93°N, 84.08°W) · America/Costa_Rica