Arenal Viejo
September
Weather in Arenal Viejo for September 2026
Your guide to Arenal Viejo weather in September - trends and predictions
So far, September 2026 in Arenal Viejo is slightly warmer than the historical average by 1.4 °C.
Expect cooler weather in the next days in Arenal Viejo with the forecast suggesting a temperature of 26 °C, lower than the historical average.
In general, the average temperature in Arenal Viejo at the beginning of September is 29.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.3 °C by the end of September.
Arenal Viejo experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 469.3 mm.
Temperatures
Rain 🌧️
0
Dry days
30
Rainy days
0
Snow days
28°/24°
Temperatures
11 km/h
Avg max wind
83 %
Avg humidity
Arenal Viejo Weather September
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Temperatures trend during September in Arenal Viejo
See the weather trend as well as the moving average line
September weather in Arenal Viejo day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 29° /24° | 9.6 mm | 5 | |
| 2 Sept. | Light rain shower | 29° /24° | 12.2 mm | 6 | |
| 3 Sept. | Light rain shower | 29° /24° | 11.1 mm | 6 | |
| 4 Sept. |  Moderate or heavy rain shower | 30° /24° | 13.6 mm | 6 | |
| 5 Sept. | Moderate rain at times | 29° /23° | 23.5 mm | 5 | |
| 6 Sept. | Moderate or heavy rain shower | 29° /23° | 17.1 mm | 5 | |
| 7 Sept. | Moderate or heavy rain shower | 29° /23° | 16.3 mm | 5 | |
| 8 Sept. | Light rain shower | 29° /24° | 6.7 mm | 5 | |
| 9 Sept. | Light rain shower | 29° /24° | 9.7 mm | 7 | |
| 10 Sept. | Light rain shower | 30° /24° | 9 mm | 5 | |
| 11 Sept. | Light rain shower | 30° /24° | 9.6 mm | 5 | |
| 12 Sept. | Moderate or heavy rain shower | 30° /24° | 12.3 mm | 6 | |
| 13 Sept. | Moderate or heavy rain shower | 30° /24° | 14.4 mm | 5 | |
| 14 Sept. | Moderate or heavy rain shower | 30° /25° | 12.7 mm | 5 | |
| 15 Sept. | Light rain shower | 29° /24° | 11.5 mm | 5 | |
| 16 Sept. | Patchy rain possible | 27° /20° | 0.9 mm | 10.3 | |
| 17 Sept. | Patchy rain possible | 28° /20° | 2.2 mm | 11 | |
| 18 Sept. | Patchy rain possible | 28° /21° | 2.4 mm | 12 | |
| 19 Sept. | Patchy rain possible | 29° /22° | 9.8 mm | 12 | |
| 20 Sept. | Light rain shower | 29° /22° | 23 mm | 7 | |
| 21 Sept. | Light rain shower | 26° /21° | 42.1 mm | 6 | |
| 22 Sept. |  Mist | 23° /21° | 5.2 mm | 5 | |
| 23 Sept. | Light rain shower | 25° /21° | 3.7 mm | 6 | |
| 24 Sept. | Light rain shower | 26° /21° | 18.7 mm | 6 | |
| 25 Sept. | Light rain shower | 25° /20° | 20.7 mm | 5 | |
| 26 Sept. |  Overcast | 23° /19° | 12.1 mm | 5 | |
| 27 Sept. | Overcast | 25° /22° | 9.9 mm | 6 | |
| 28 Sept. | Overcast | 24° /22° | 0.9 mm | 5 | |
| 29 Sept. | Light rain shower | 26° /21° | 18 mm | 6 | |
| 30 Sept. | Light rain shower | 28° /23° | 23.8 mm | 6 | |
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Important Notice
Our weather forecast for Arenal Viejo in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Arenal Viejo forecast closer to your planned date for the most up-to-date weather information.
Change Month
Arenal Viejo in September - FAQ
What are the expected maximum and minimum temperatures in Arenal Viejo during September?
During September, expect a variety of temperatures with highs around 28° and lows near 24°, suitable for diverse activities and preferences.
How much rainfall should be expected in Arenal Viejo during September?
Significant rainfall exceeding 469.3 mm is expected in Arenal Viejo during September, occurring over more than 30 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Arenal Viejo during September?
The average wind speed in Arenal Viejo during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Arenal Viejo
Explore the daily rainfall trends and prepare for Arenal Viejos September weather 💧
Typically, Arenal Viejo has 30 rainy days in September with a total of 469.3 mm of rainfall.
UV exposure in Arenal Viejo during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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