Rainfall totals Boise, ID
Through Oct 8, 2026, Boise has received 7.86 inches of rain for the year, according to the official daily climate report. The normal year-to-date total is 8.15 inches. The normal figure is what the city would typically have seen by this point in the calendar. This reading comes from the station gauge at BOISE MUNICIPAL in the National Weather Service's daily climate report.
as of
Data from Boise Air Terminal, with records back to 1940. Across the record from 1940, 100 percent of days have a reading, with 100 percent in 2025.
Most recent rainfall
0.04 inches of rain fell on Sep 18, 2026, the latest measurable rainfall this year.
BOISE MUNICIPAL saw no measurable rain on Oct 8, 2026, according to the National Weather Service daily climate report.
The last measurable rain in Boise fell on Sep 18, 2026, 20 days ago. In October, rain days at this station are typically 2 days apart.
Official rainfall report for Oct 8, 2026
| Measured | Normal | vs normal | |
|---|---|---|---|
| Rain on Oct 8, 2026 | 0.00 inches | 0.02 inches | -0.02 inches |
| Last 48 hours | 0.00 inches | ||
| Last 72 hours | 0.00 inches | ||
| Last 7 days | 0.00 inches | ||
| Month to date | 0.00 inches | 0.17 inches | -0.17 inches |
| Year to date | 7.86 inches | 8.15 inches | -0.29 inches (-4%) |
| Record for Oct 8 | 0.46 inches | 2021 |
Source: National Weather Service daily climate report for BOISE MUNICIPAL, issued the morning after Oct 8, 2026. The local National Weather Service office issues the daily climate report for the airport station the next morning, and that report is the official figure.
How much rain did Boise get?
Days with measurable rain, 2026
| Date | Rainfall |
|---|---|
| Sep 18, 2026 | 0.04 inches |
| Sep 17, 2026 | 0.01 inches |
| Sep 6, 2026 | 0.02 inches |
| Sep 4, 2026 | 0.17 inches |
| Sep 3, 2026 | 0.11 inches |
| Sep 2, 2026 | 0.01 inches |
| Jul 17, 2026 | 0.16 inches |
| Jul 16, 2026 | 0.01 inches |
| Jun 27, 2026 | 0.23 inches |
| Jun 26, 2026 | 0.30 inches |
| Jun 20, 2026 | 0.12 inches |
| Jun 9, 2026 | 0.03 inches |
| Jun 8, 2026 | 0.02 inches |
| May 26, 2026 | 0.06 inches |
| May 25, 2026 | 0.02 inches |
| Apr 22, 2026 | 0.87 inches |
| Apr 21, 2026 | 0.01 inches |
| Apr 16, 2026 | 0.01 inches |
| Apr 15, 2026 | 0.53 inches |
| Apr 13, 2026 | 0.80 inches |
| Apr 12, 2026 | 0.78 inches |
| Apr 11, 2026 | 0.04 inches |
| Apr 10, 2026 | 0.39 inches |
| Apr 2, 2026 | 0.16 inches |
| Apr 1, 2026 | 0.28 inches |
| Mar 31, 2026 | 0.11 inches |
| Mar 14, 2026 | 0.02 inches |
| Mar 5, 2026 | 0.03 inches |
| Mar 4, 2026 | 0.61 inches |
| Mar 2, 2026 | 0.01 inches |
With 0.87 inches on Apr 22, 2026, this is the 46th wettest of the 7,774 measurable rain days in the Boise Air Terminal record, which begins in 1940. That is the most rain recorded at this station on April 22 since 1940.
Through Oct 3, 2026, the GHCN-Daily station record shows 7.86 inches of measurable rain so far this year, falling over a 48-day span. Station observations are from GHCN-Daily, with a 1-3 day lag and quality checks by NOAA.
Boise rainfall by month, 2026
| Month | Rainfall | Normal | vs normal |
|---|---|---|---|
| January | 0.73 inches | 1.41 inches | -0.68 inches (-48%) |
| February | 1.16 inches | 1.00 inches | +0.16 inches (+16%) |
| March | 0.79 inches | 1.33 inches | -0.54 inches (-41%) |
| April | 3.87 inches | 1.23 inches | +2.64 inches (+215%) |
| May | 0.08 inches | 1.45 inches | -1.37 inches (-94%) |
| June | 0.70 inches | 0.75 inches | -0.05 inches (-7%) |
| July | 0.17 inches | 0.21 inches | -0.04 inches |
| August | 0.00 inches | 0.17 inches | -0.17 inches |
| September | 0.36 inches | 0.43 inches | -0.07 inches |
| October | 0.00 inches | 0.81 inches |
October is still in progress; figures run through Oct 3, 2026. Averages are 1991-2020 normals from NCEI.
Rainfall days at each threshold in Boise
| Year | 0.5+ in. | 1+ in. | 2+ in. | 3+ in. |
|---|---|---|---|---|
| 2025 | 4 | 0 | 0 | 0 |
| 2024 | 6 | 2 | 0 | 0 |
| 2023 | 5 | 1 | 0 | 0 |
| 2022 | 4 | 0 | 0 | 0 |
| 2021 | 5 | 0 | 0 | 0 |
| 2020 | 6 | 1 | 0 | 0 |
| 2019 | 6 | 0 | 0 | 0 |
| 2018 | 3 | 0 | 0 | 0 |
| 2017 | 5 | 2 | 0 | 0 |
| 2016 | 0 | 0 | 0 | 0 |
| Average | 3.3 | 0.3 | 0.0 | 0.0 |
A day counts when its rainfall total meets or passes the column amount, from Boise Air Terminal records in GHCN-Daily. Every complete year starting with 1940 counts toward the average, 86 years in total.
Past rainfall years in Boise
All-time rainfall records
| Wettest day | 1.91 inches | Jun 12, 1958 |
|---|---|---|
| Wettest year | 18.77 inches | 1983 |
| Driest year | 6.64 inches | 1966 |
| Average year | 11.85 inches | 86 complete years on record |
| Rain days a year | 90 | average, 0.01 inch or more |
| Record begins | 1940 | 31,672 daily readings |
Monthly rainfall normals
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inches | 1.41 | 1.00 | 1.33 | 1.23 | 1.45 | 0.75 | 0.21 | 0.17 | 0.43 | 0.81 | 1.18 | 1.54 | 11.51 |
Averages are 1991-2020 normals from NCEI.
The daily climate report is issued by the local National Weather Service forecast office and delivered to this page by the Iowa Environmental Mesonet of Iowa State University. Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.