Temperature
Warm by day, mild at night.
79°Ftypical September high
Typical range
September climate
September in San José
Costa Rica · Central America
Not the best time: Late-day mugginess is the main limitation.
Not an ideal month
Afternoons can feel muggy.
Daytime high
79°F
Lows around 66°F
Rain
Rain most days
Sun
5 h/day
Air feel
Humid
When to visit
Month-by-month fit
Best
Precipitation
It rains on most days. About 29 wet days, the highest monthly average.
97%wet-day frequency
AmountWet-day chance
Sunshine
Sunshine is limited, with cloud often dominating.
4.9 hSeptember sunshine
Heat & humidity by month
Warm days, with humid periods.
96%September Heat feel
Easy airWarm airHot airHumid air
Hourly temperature pattern
In September, afternoons feel about 80° and nights feel near 71°.
ComfortableWarmHotNight hours
Clear sky
Overcast skies this month.
9%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
2 mphSeptember Calm
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 72°F, easing to about 70°F in early evening.
Avg temp Typical range
Morning76°F
Feels 82°F
Rain51%
Cloud81%
Humid airVery high
Sun intensityModerate
Midday77°F
Feels 84°F
Rain94%
Cloud93%
Humid airVery high
Sun intensityModerate
Late afternoon72°F
Feels 78°F
Rain87%
Cloud96%
Humid airVery high
Sun intensityLow
Early evening70°F
Feels 75°F
Rain35%
Cloud95%
Humid airVery high
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 79 | 65 | 1.1 | 6 | 9.2 | 74 |
| Feb | 80 | 65 | 0.8 | 5 | 9.4 | 71 |
| Mar | 82 | 65 | 0.9 | 5 | 9.1 | 71 |
| Apr | 82 | 67 | 2.6 | 12 | 8.0 | 74 |
| May | 80 | 67 | 12.8 | 25 | 5.9 | 85 |
| Jun | 79 | 67 | 15.6 | 28 | 4.8 | 89 |
| Jul | 79 | 67 | 10.6 | 25 | 4.9 | 86 |
| Aug | 79 | 67 | 13.9 | 27 | 5.1 | 88 |
| Sep | 79 | 66 | 16.8 | 29 | 4.9 | 90 |
| Oct | 78 | 66 | 18.0 | 29 | 5.2 | 91 |
| Nov | 78 | 66 | 10.5 | 23 | 5.9 | 88 |
| Dec | 78 | 65 | 3.1 | 11 | 7.9 | 80 |
Similar climates
Similar
Similar travel styleSan SalvadorEl SalvadorSimilar travel stylePanama CityPanamaSimilar travel styleSingaporeSingaporeSimilar travel styleHong KongChina
Want a side-by-side climate view? Compare San José with San Salvador.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology