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Kalaheo Hillside climate
Typical historical weather for Kalaheo Hillside, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.
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Annual average
13.5°C
across all months
Warmest month
22.7°C
Aug average high
Coolest month
6.6°C
Feb average low
Annual rainfall
838mm
total per year
Kalaheo Hillside is typically hottest in August and coolest in February, a swing of about 16.1°C across the year. About 54% of annual rainfall falls in the three wettest months (January is typically wettest, July driest).
Monthly averages
Average daily high/low temperature (band) and monthly rainfall (bars).
| Month | Avg high | Avg low | Rainfall | Wet days | Humidity | Wind | Cloud | Solar |
|---|---|---|---|---|---|---|---|---|
| Jan | 13.4°C · record 14.9–20.5°C | 7.2°C · record 0.8–4.5°C | 181mm | 13 | 82% | 3.2 m/s | 66% | 2.1 kWh/m² |
| Feb | 13.7°C · record 16–25.7°C | 6.6°C · record -0.4–3.9°C | 126mm | 10 | 79% | 3.6 m/s | 54% | 3.2 kWh/m² |
| Mar | 14.1°C · record 15–23.1°C | 7.1°C · record 1.7–5.7°C | 135mm | 14 | 79% | 3.4 m/s | 59% | 4.3 kWh/m² |
| Apr | 16.1°C · record 19.8–26.7°C | 8.5°C · record 3.6–7.6°C | 53mm | 7 | 77% | 3.7 m/s | 52% | 6.1 kWh/m² |
| May | 18.1°C · record 21.7–27.1°C | 10.1°C · record 5.6–9.5°C | 32mm | 4 | 77% | 4 m/s | 46% | 7.3 kWh/m² |
| Jun | 20.7°C · record 23.5–31°C | 12°C · record 8.6–10.2°C | 4mm | 1 | 75% | 4.1 m/s | 38% | 8 kWh/m² |
| Jul | 22°C · record 24.3–33.5°C | 12.8°C · record 10.4–11.5°C | 1mm | 0 | 78% | 3.5 m/s | 39% | 8 kWh/m² |
| Aug | 22.7°C · record 24–31.2°C | 13.6°C · record 10.5–12.5°C | 2mm | 0 | 79% | 3.1 m/s | 41% | 7 kWh/m² |
| Sep | 22.5°C · record 24.8–35.5°C | 13.4°C · record 8–11.7°C | 9mm | 2 | 77% | 3 m/s | 40% | 5.6 kWh/m² |
| Oct | 20.2°C · record 24–33°C | 11°C · record 4.8–9°C | 48mm | 4 | 76% | 2.9 m/s | 41% | 4 kWh/m² |
| Nov | 15.8°C · record 17.6–22.3°C | 8.1°C · record 0.8–4.7°C | 109mm | 9 | 81% | 2.8 m/s | 54% | 2.6 kWh/m² |
| Dec | 13.2°C · record 16–20°C | 6.9°C · record 0.2–3.8°C | 137mm | 11 | 83% | 3 m/s | 65% | 1.9 kWh/m² |
"Avg high"/"Avg low" is the mean daily high/low for that month, averaged across every year on file. The "record" figure alongside it is a different statistic — the single hottest (or coldest) hour ever recorded during that month across all years — so it can sit above or below the average and does not describe the average's year-to-year spread. A "wet day" is any day with at least 1.0mm of rain.
Year to year
Annual average temperature, 2016–2025.
Across these 10 years, the annual average has moved by about -0.5°C per decade. That’s a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
Annual rainfall has moved by about +74.19mm per decade over the same period.
2025 (the most recent year on file) averaged 13.409328638364213°C, below the 9-year baseline of 13.5°C by 0.25 standard deviations.
Typical extremes per year
Rainy days
73.6 days
≥1.0mm rain
Heavy rain days
12 days
≥20mm rain
Extreme heat days
0 days
daily high ≥40°C
Frost days
0.2 days
daily low ≤0°C
Averaged across 10 years on file. Thresholds match PastClimate's data pipeline definitions — see data & sources.
Records on file
Ranked across 10 years of data currently on file (2016–2025).
Hottest day
35.5°C
2 September 2017
2017 was 0.53 SD above the 9-year average that year
Coldest day
-0.4°C
25 February 2022
2022 was 1.73 SD below the 9-year average that year
Wettest day
95.8mm
20 November 2024
2024 was 0.79 SD above the 9-year average that year
Windiest day
10.4m/s
4 January 2023
2023 was 0.75 SD below the 9-year average that year
See the detail: Kalaheo Hillside on 20 November 2024.
Nearby cities
Honolulu
Same ERA5 grid cell
Pearl City
Same ERA5 grid cell
Waiau-Pacific Palisades
Same ERA5 grid cell
Makakilo / Kapolei / Honokai Hale
Same ERA5 grid cell
Kalihi-Palama
Same ERA5 grid cell
Joint Base Pearl Harbor Hickam
Same ERA5 grid cell
Want a side-by-side view instead? Compare Kalaheo Hillside with another city.
Frequently asked questions about Kalaheo Hillside's climate
What is the hottest month in Kalaheo Hillside?
August is typically the warmest month in Kalaheo Hillside, with an average high of 22.7°C. February is typically the coolest, averaging 6.6°C overnight.
How much does it rain in Kalaheo Hillside?
Kalaheo Hillside gets about 838mm of rain a year on average, with roughly 54% of it falling in the three wettest months (January is typically the wettest, July the driest).
How many extremely hot or cold days does Kalaheo Hillside have?
On average, Kalaheo Hillside sees about 0 day(s) a year at or above 40°C and about 0.2 day(s) at or below 0°C, based on 10 years of data.
Is Kalaheo Hillside getting warmer?
Across the 10 years on file (2016–2025), the annual average temperature has moved by about -0.5°C per decade. That's a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
What is the hottest day on record for Kalaheo Hillside?
The hottest day on file is 2 September 2017 at 35.5°C, out of 10 year(s) searched.
Data & provenance
↓ Download monthly CSVData source & coverage — ERA5 reanalysis, 2016–2025 (10 years)details
- Source
- ERA5 reanalysis, accessed via the Copernicus Climate Change Service (C3S) Climate Data Store
- Data type
- Reanalysis — a physically consistent reconstruction combining a forecast model with historical observations, not a live station reading or a forecast
- Coverage
- 2016–2025 (10 years) for United States
- Location
- Kalaheo Hillside — 39.250°, -123.750°, ERA5 grid cell center, 3784.7 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- Monthly and annual averages, and dated extreme-value records, derived from an hourly base record.
- Spatial resolution
- 0.25° (~25 km) distributed grid — ERA5's native model resolution is finer; this is the publicly distributed regridded product
- Version / refreshed
- Methodology v2026.07 · data last refreshed December 31, 2025
- Limitations
- A model reconstruction, not a station observation — hyper-local extremes (a single storm cell, an urban heat pocket) can differ from a nearby gauge. See the full methodology.
- Attribution
- Generated using Copernicus Climate Change Service information
Cite this data
PastClimate (2026-07-17). Historical climate data for Kalaheo Hillside, United States (39.25°N, 123.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Kalaheo Hillside, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Kalaheo Hillside, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Kalaheo Hillside, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-17},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.