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Pleasant Hill climate
Typical historical weather for Pleasant Hill, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.
Data last updated: 31 December 2025
Want today's actual conditions instead? See the current forecast for Pleasant Hill. Planning a garden? See the gardening & growing season planner. Or browse the 365-day climate calendar.
Annual average
15.5°C
across all months
Warmest month
28.2°C
Aug average high
Coolest month
6.4°C
Dec average low
Annual rainfall
484mm
total per year
Pleasant Hill is typically hottest in August and coolest in December, a swing of about 21.8°C across the year. About 59% 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 | 14.7°C · record 17.1°C–25.5°C | 6.5°C · record -1.5°C–2.1°C | 110mm | 10 | 79% | 2.2 m/s | 68% | 2.3 kWh/m² |
| Feb | 16.9°C · record 17.5°C–26.7°C | 6.5°C · record 0.1°C–4.2°C | 82mm | 7 | 70% | 2.5 m/s | 52% | 3.5 kWh/m² |
| Mar | 17.9°C · record 19.7°C–29.5°C | 8°C · record 0.8°C–5.2°C | 88mm | 10 | 71% | 2.7 m/s | 56% | 4.6 kWh/m² |
| Apr | 21.4°C · record 26.6°C–32.4°C | 9.6°C · record 2.2°C–7.7°C | 26mm | 4 | 67% | 3 m/s | 45% | 6.3 kWh/m² |
| May | 24.1°C · record 26.6°C–36.4°C | 11.7°C · record 6.2°C–10.5°C | 15mm | 2 | 64% | 3.7 m/s | 36% | 7.4 kWh/m² |
| Jun | 27°C · record 30.6°C–39.3°C | 13.6°C · record 10°C–11.8°C | 1mm | 0 | 62% | 3.9 m/s | 27% | 8.2 kWh/m² |
| Jul | 27.7°C · record 30.7°C–37.9°C | 13.9°C · record 11.5°C–12.9°C | 0mm | 0 | 66% | 4 m/s | 25% | 8.1 kWh/m² |
| Aug | 28.2°C · record 31.4°C–41°C | 14.6°C · record 11.9°C–13.7°C | 0mm | 0 | 67% | 3.6 m/s | 26% | 7.2 kWh/m² |
| Sep | 27.9°C · record 29.5°C–41.7°C | 14.3°C · record 8°C–14.3°C | 4mm | 1 | 66% | 3 m/s | 27% | 5.9 kWh/m² |
| Oct | 24.8°C · record 29.2°C–37.8°C | 11.7°C · record 4°C–8.8°C | 23mm | 2 | 64% | 2.3 m/s | 34% | 4.3 kWh/m² |
| Nov | 18.4°C · record 20.8°C–28.7°C | 8.3°C · record 0.9°C–6°C | 47mm | 6 | 73% | 2 m/s | 53% | 2.8 kWh/m² |
| Dec | 14.2°C · record 16°C–23.5°C | 6.4°C · record -0.1°C–3.2°C | 89mm | 9 | 80% | 2.1 m/s | 67% | 2.1 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 -0.6°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 -83.79mm per decade over the same period.
2025 (the most recent year on file) averaged 15.2°C, below the 9-year baseline of 15.6°C by 1.22 standard deviations.
Typical extremes per year
Rainy days
50.6 days
≥1.0mm rain
Heavy rain days
5.5 days
≥20mm rain
Extreme heat days
0.7 days
daily high ≥40°C
Frost days
0.3 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
41.7°C
6 September 2020
2020 was 2.19 SD above the 9-year average that year
Coldest day
-1.5°C
2 January 2022
2022 was 0.72 SD below the 9-year average that year
Wettest day
73.3mm
24 October 2021
2021 was 0.89 SD below the 9-year average that year
Windiest day
7.9m/s
4 February 2024
2024 was 1.01 SD above the 9-year average that year
See the detail: Pleasant Hill on 24 October 2021.
Nearby cities
Frequently asked questions about Pleasant Hill's climate
What is the hottest month in Pleasant Hill?
August is typically the warmest month in Pleasant Hill, with an average high of 28.2°C. December is typically the coolest, averaging 6.4°C overnight.
How much does it rain in Pleasant Hill?
Pleasant Hill gets about 484mm of rain a year on average, with roughly 59% of it falling in the three wettest months (January is typically the wettest, July the driest).
How many extremely hot or cold days does Pleasant Hill have?
On average, Pleasant Hill sees about 0.7 day(s) a year at or above 40°C and about 0.3 day(s) at or below 0°C, based on 10 years of data.
Is Pleasant Hill getting warmer?
Across the 10 years on file (2016–2025), the annual average temperature has moved by about -0.59°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 Pleasant Hill?
The hottest day on file is 6 September 2020 at 41.7°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
- Pleasant Hill — 38.000°, -122.000°, ERA5 grid cell center, 7.9 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 (2026-07-20). Historical climate data for Pleasant Hill, United States (38.00°N, 122.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Pleasant Hill, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Pleasant Hill, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 20, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Pleasant Hill, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-20},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.