Colombia
San Andrés in September: weather, sea & travel advice
This month's data profile
Rain shapes the decision
San Andrés in September is climatically well suited to beach holidays. The average daily high is around 29 °C, and the sea is about 29 °C. With about 29 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
56/100 · #11
Warmth
#1
Dryness
#10
Sun
#7
Sea warmth
#1
Published best categories: none
Climate facts
- Average high
- 29 °C
- Average low
- 28 °C
- Sea
- 29 °C
- Rainy days (est.)
- 29 rainy days (est.)
- Sun (est.)
- 7 h/day
- Humidity
- 82 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| August | 28 | 28 | 29 | 163 | 6.8 | 83 | 5.2 | 29 | 57 |
| September (selected) | 29 | 28 | 29 | 173 | 6.5 | 82 | 4.0 | 29 | 56 |
| October | 29 | 28 | 29 | 245 | 5.8 | 82 | 4.3 | 29 | 56 |
How do the previous and next months compare?
Baseline: September (56/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| August | +1 | -0.1 °C | ±0 °C | ±0 | -10.2 mm | +0.3 h | +0.8 % | +1.1 m/s | -0.5 °C |
| October | ±0 | ±0 °C | -0.1 °C | +0.4 | +72.3 mm | -0.7 h | -0.4 % | +0.3 m/s | ±0 °C |
All twelve months in context
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Where to stay in San Andrés
Compare available stays, prices and cancellation terms for San Andrés on Booking.com.
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Useful next decisions
Frequently asked questions
How warm is San Andrés in September?
The average daily high is around 29 °C, with an average daily low of about 28 °C.
Can you swim in San Andrés in September?
The sea is about 29 °C (very warm).
Does it rain a lot in San Andrés in September?
The curated estimate is about 29 rainy days per month, not a directly measured long-term average. Total precipitation averages around 173 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit San Andrés?
By the climate score, January, February, March and April are the strongest months for San Andrés. For a beach trip: January, February, March and April. September is not among them.